[PATCH 21/30] v4l:vxd-dec:Decoder Core Component

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From: Sidraya <sidraya.bj@xxxxxxxxxxxxxxxxxxx>

Core component is the entry point for decoder
stack, and manages decoder state machine.

Signed-off-by: Sunita Nadampalli <sunitan@xxxxxx>
Signed-off-by: Sidraya <sidraya.bj@xxxxxxxxxxxxxxxxxxx>
---
 MAINTAINERS                              |    2 +
 drivers/staging/media/vxd/decoder/core.c | 3656 ++++++++++++++++++++++
 drivers/staging/media/vxd/decoder/core.h |   72 +
 3 files changed, 3730 insertions(+)
 create mode 100644 drivers/staging/media/vxd/decoder/core.c
 create mode 100644 drivers/staging/media/vxd/decoder/core.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 6dadec058ab3..41716f2916d1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19569,6 +19569,8 @@ F:	drivers/staging/media/vxd/common/work_queue.h
 F:	drivers/staging/media/vxd/decoder/bspp.c
 F:	drivers/staging/media/vxd/decoder/bspp.h
 F:	drivers/staging/media/vxd/decoder/bspp_int.h
+F:	drivers/staging/media/vxd/decoder/core.c
+F:	drivers/staging/media/vxd/decoder/core.h
 F:	drivers/staging/media/vxd/decoder/dec_resources.c
 F:	drivers/staging/media/vxd/decoder/dec_resources.h
 F:	drivers/staging/media/vxd/decoder/fw_interface.h
diff --git a/drivers/staging/media/vxd/decoder/core.c b/drivers/staging/media/vxd/decoder/core.c
new file mode 100644
index 000000000000..237e7f937751
--- /dev/null
+++ b/drivers/staging/media/vxd/decoder/core.c
@@ -0,0 +1,3656 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VXD Decoder Core component function implementations
+ *
+ * Copyright (c) Imagination Technologies Ltd.
+ * Copyright (c) 2021 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Authors:
+ *	Sunita Nadampalli <sunitan@xxxxxx>
+ *
+ * Re-written for upstream
+ *	Sidraya Jayagond <sidraya.bj@xxxxxxxxxxxxxxxxxxx>
+ *	Prashanth Kumar Amai <prashanth.ka@xxxxxxxxxxxxxxxxxxx>
+ */
+
+#include "core.h"
+#include "decoder.h"
+#include "img_errors.h"
+#include "img_pixfmts.h"
+#include "img_profiles_levels.h"
+#include "lst.h"
+#include "resource.h"
+#include "rman_api.h"
+#include "vdecdd_utils.h"
+#include "vdec_mmu_wrapper.h"
+#include "vxd_dec.h"
+
+#ifdef HAS_HEVC
+#define SEQ_RES_NEEDED
+#define GENC_BUFF_COUNT 4
+#endif
+
+/*
+ * This enum defines resource availability masks.
+ * @brief  Resource Availability
+ */
+enum core_availability {
+	CORE_AVAIL_PICTBUF      = (1 << 0),
+	CORE_AVAIL_PICTRES      = (1 << 1),
+	CORE_AVAIL_CORE         = (1 << 2),
+	CORE_AVAIL_MAX,
+	CORE_AVAIL_FORCE32BITS = 0x7FFFFFFFU
+};
+
+struct core_mbparam_alloc_info {
+	unsigned char alloc_mbparam_bufs;
+	unsigned int mbparam_size;
+	unsigned int overalloc_mbnum;
+};
+
+static struct core_mbparam_alloc_info mbparam_allocinfo[VDEC_STD_MAX - 1] = {
+	/*                AllocFlag    MBParamSize    Overalloc     */
+	/* MPEG2    */ { TRUE,    0xc8,          0             },
+	/* MPEG4    */ { TRUE,    0xc8,          0             },
+	/* H263     */ { TRUE,    0xc8,          0             },
+	/* H264     */ { TRUE,    0x80,          0             },
+	/* VC1      */ { TRUE,    0x80,          (4096 * 2) / 0x80 },
+	/* AVS      */ { TRUE,    0x80,          0             },
+	/* REAL     */ { TRUE,    0x80,          0             },
+	/* JPEG     */ { FALSE,   0x00,          0             },
+	/* VP6      */ { TRUE,    0x80,          0             },
+	/* VP8      */ { TRUE,    0x80,          0             },
+	/* SORENSON */ { TRUE,    0xc8,          0             },
+	/* HEVC     */ { TRUE,    0x40,          0             },
+};
+
+struct vxdio_mempool {
+	unsigned int mem_heap_id;
+	enum sys_emem_attrib mem_attrib;
+};
+
+static unsigned int global_avail_slots;
+static unsigned char is_core_initialized;
+
+/*
+ * This structure contains the core Context.
+ * @brief  core Context
+ */
+struct core_context {
+	struct vdecdd_dddev_context     *dev_ctx;
+	/* List of stream context structures */
+	struct lst_t core_str_ctx;
+	vxd_cb vxd_str_processed_cb;
+};
+
+/* Global Core Context */
+static struct core_context *global_core_ctx;
+
+/*
+ * This structure contains the picture buffer size info.
+ * @brief  Picture Resource Info
+ */
+struct core_pict_bufsize_info {
+	unsigned int mbparams_bufsize;
+
+#ifdef HAS_HEVC
+	union {
+		struct hevc_bufsize_pict {
+			/* Size of GENC fragment buffer for HEVC */
+			unsigned int genc_fragment_bufsize;
+		} hevc_bufsize_pict;
+	};
+#endif
+};
+
+/*
+ * This structure contains the sequence resource info.
+ * @brief  Sequence Resource Info
+ */
+struct core_seq_resinfo {
+	union {
+#ifdef HAS_HEVC
+		struct hevc_bufsize_seqres {
+			unsigned int genc_bufsize; /* Size of GEN buffers for HEVC */
+			unsigned int intra_bufsize; /* Size of GEN buffers for HEVC */
+			unsigned int aux_bufsize;   /* Size of GEN buffers for HEVC */
+		} hevc_bufsize_seqres;
+#endif
+
+#ifndef SEQ_RES_NEEDED
+		unsigned int dummy;
+#endif
+	};
+};
+
+struct core_pict_resinfo {
+	unsigned int pict_res_num;
+	struct core_pict_bufsize_info size_info;
+	unsigned char is_valid;
+};
+
+/*
+ * This structure contains the standard specific part of plant context.
+ * @brief  Standard Specific Context
+ */
+struct core_std_spec_context {
+	union {
+#ifdef HAS_HEVC
+		struct hevc_ctx {
+			/* Counts genc buffer allocations  */
+			unsigned short genc_id_gen;
+		} hevc_ctx;
+#else
+		unsigned int dummy;
+#endif
+	};
+};
+
+struct core_stream_context;
+
+struct core_std_spec_operations {
+	/* Allocates standard specific picture buffers.  */
+	int (*alloc_picture_buffers)(struct core_stream_context *core_strctx,
+				     struct vdecdd_pict_resint *pict_resint,
+				     struct vxdio_mempool mem_pool,
+				     struct core_pict_resinfo *pict_res_info);
+
+	/* Frees standard specific picture buffers.  */
+	int (*free_picture_resource)(struct core_stream_context *core_strctx,
+				     struct vdecdd_pict_resint *pic_res_int);
+
+	/* Allocates standard specific sequence buffers.  */
+	int (*alloc_sequence_buffers)(struct core_stream_context *core_strctx,
+				      struct vdecdd_seq_resint *seq_res_int,
+				      struct vxdio_mempool mem_pool,
+				      struct core_seq_resinfo *seq_res_info);
+
+	/* Frees standard specific sequence buffers.  */
+	int (*free_sequence_resource)(struct core_stream_context *core_strctx,
+				      struct vdecdd_seq_resint *seq_res_int);
+
+	/* Returns buffer's sizes (common and standard specific).  */
+	int (*bufs_get_size)(struct core_stream_context *core_strctx,
+			     const struct vdec_comsequ_hdrinfo *seq_hdrinfo,
+			     struct vdec_pict_size *max_pict_size,
+			     struct core_pict_bufsize_info *size_info,
+			     struct core_seq_resinfo *seq_resinfo,
+			     unsigned char *resource_needed);
+
+	/* Checks whether resource is still suitable.  */
+	unsigned char (*is_stream_resource_suitable)(struct core_pict_resinfo *pict_resinfo,
+						     struct core_pict_resinfo *old_pict_resinfo,
+						     struct core_seq_resinfo *seq_resinfo,
+						     struct core_seq_resinfo *old_seq_resinfo);
+};
+
+/*
+ * This structure contains the core Stream Context.
+ * @brief  core Stream Context
+ */
+struct core_stream_context {
+	void    **link; /* to be part of single linked list */
+	struct core_context     *core_ctx;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct vxd_dec_ctx      *vxd_dec_context;
+
+	/* list of picture buffers */
+	struct lst_t pict_buf_list;
+
+	/* List of picture resources allocated for this stream */
+	struct lst_t pict_res_list;
+	struct lst_t old_pict_res_list;
+
+	struct lst_t aux_pict_res_list;
+
+#ifdef SEQ_RES_NEEDED
+	/* List of active sequence resources that are allocated for this stream. */
+	struct lst_t seq_res_list;
+	/*
+	 * List of sequence resources that are allocated for this stream but no
+	 * longer suitable for new sequence(s).
+	 */
+	struct lst_t old_seq_res_list;
+#endif
+
+	/* List of sequence header information */
+	struct lst_t seq_hdr_list;
+	/* Queue of stream units to be processed */
+	struct lst_t str_unit_list;
+
+	struct vdec_comsequ_hdrinfo comseq_hdr_info;
+	unsigned char opcfg_set;
+	/* Picture buffer layout to use for decoding. */
+	struct vdecdd_ddpict_buf disp_pict_buf;
+	struct vdec_str_opconfig op_cfg;
+	unsigned char new_seq;
+	unsigned char new_op_cfg;
+	unsigned char no_prev_refs_used;
+	unsigned int avail_slots;
+	unsigned int res_avail;
+	unsigned char stopped;
+	struct core_pict_resinfo pict_resinfo;
+	/* Current sequence resource info. */
+	struct core_seq_resinfo seq_resinfo;
+
+	/* Reconstructed picture buffer */
+	struct vdecdd_ddpict_buf recon_pictbuf;
+	/* Coded picture size of last reconfiguration */
+	struct vdec_pict_size coded_pict_size;
+	/* Standard specific operations. */
+	struct core_std_spec_operations *std_spec_ops;
+	/* Standard specific context. */
+	struct core_std_spec_context std_spec_context;
+};
+
+#ifdef HAS_HEVC
+static int core_free_hevc_picture_resource(struct core_stream_context *core_strctx,
+					   struct vdecdd_pict_resint *pic_res_int);
+
+static int core_free_hevc_sequence_resource(struct core_stream_context *core_strctx,
+					    struct vdecdd_seq_resint *seq_res_int);
+
+static int core_hevc_bufs_get_size(struct core_stream_context *core_str_ctx,
+				   const struct vdec_comsequ_hdrinfo *seq_hdr_info,
+				   struct vdec_pict_size *max_pict_size,
+				   struct core_pict_bufsize_info *size_info,
+				   struct core_seq_resinfo *seq_res_info,
+				   unsigned char *resource_needed);
+
+static unsigned char core_is_hevc_stream_resource_suitable
+			(struct core_pict_resinfo *pict_res_info,
+			 struct core_pict_resinfo *old_pict_res_info,
+			 struct core_seq_resinfo *seq_res_info,
+			 struct core_seq_resinfo *old_seq_res_info);
+
+static int core_alloc_hevc_specific_seq_buffers(struct core_stream_context *core_strctx,
+						struct vdecdd_seq_resint *seq_res_int,
+						struct vxdio_mempool mempool,
+						struct core_seq_resinfo *seq_res_info);
+
+static int core_alloc_hevc_specific_pict_buffers(struct core_stream_context *core_strctx,
+						 struct vdecdd_pict_resint *pict_res_int,
+						 struct vxdio_mempool mempool,
+						 struct core_pict_resinfo *pict_res_info);
+#endif
+
+static int
+core_common_bufs_getsize(struct core_stream_context *core_str_ctx,
+			 const struct vdec_comsequ_hdrinfo *comseq_hdrinfo,
+			 struct vdec_pict_size *max_pict_size,
+			 struct core_pict_bufsize_info     *size_info,
+			 struct core_seq_resinfo  *seq_res_info, unsigned char *res_needed);
+
+static struct core_std_spec_operations std_specific_ops[VDEC_STD_MAX - 1] = {
+	/* AllocPicture  FreePicture  AllocSeq   FreeSeq   BufsGetSize  IsStreamResourceSuitable */
+	/* MPEG2   */ { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+	/* MPEG4   */ { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+	/* H263    */ { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+
+	/* H264    */ { NULL,       NULL,      NULL,   NULL,  core_common_bufs_getsize,      NULL},
+
+	/* VC1    */  { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+
+	/* AVS    */  { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+
+	/* REAL    */ { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+
+	/* JPEG    */ { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+
+	/* VP6    */  { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+
+	/* VP8    */  { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+
+	/* SORENSON    */ { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+#ifdef HAS_HEVC
+	/* HEVC     */ { core_alloc_hevc_specific_pict_buffers,
+			 core_free_hevc_picture_resource,
+			 core_alloc_hevc_specific_seq_buffers,
+			 core_free_hevc_sequence_resource,
+			 core_hevc_bufs_get_size,
+			 core_is_hevc_stream_resource_suitable},
+#else
+	/* HEVC    */ { NULL,       NULL,      NULL,   NULL,  NULL,      NULL},
+#endif
+};
+
+#ifdef ERROR_CONCEALMENT
+/*
+ * This structure contains the Error Recovery Frame Store info.
+ * @brief  Error Recovery Frame Store Info
+ */
+struct core_err_recovery_frame_info {
+	/* Flag to indicate if Error Recovery Frame Store is enabled for standard. */
+	unsigned char enabled;
+	/* Limitation for maximum frame size based on dimensions. */
+	unsigned int max_size;
+};
+
+static struct core_err_recovery_frame_info err_recovery_frame_info[VDEC_STD_MAX - 1] = {
+	/*               enabled  max_frame_size  */
+	/* MPEG2    */ { TRUE,     ~0         },
+	/* MPEG4    */ { TRUE,     ~0         },
+	/* H263     */ { FALSE,     0         },
+	/* H264     */ { TRUE,     ~0         },
+	/* VC1      */ { FALSE,     0         },
+	/* AVS      */ { FALSE,     0         },
+	/* REAL     */ { FALSE,     0         },
+	/* JPEG     */ { FALSE,     0         },
+	/* VP6      */ { FALSE,     0         },
+	/* VP8      */ { FALSE,     0         },
+	/* SORENSON */ { FALSE,     0         },
+	/* HEVC     */ { TRUE,     ~0         },
+};
+#endif
+
+static void core_fw_response_cb(int res_str_id, unsigned int *msg, unsigned int msg_size,
+				unsigned int msg_flags)
+{
+	struct core_stream_context *core_str_ctx;
+	int ret;
+
+	/* extract core_str_ctx and dec_core_ctx from res_str_id */
+	VDEC_ASSERT(res_str_id);
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID, (void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		pr_err("could not extract core_str_context\n");
+
+	ret = decoder_service_firmware_response(core_str_ctx->dd_str_ctx->dec_ctx,
+						msg, msg_size, msg_flags);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		pr_err("decoder_service_firmware_response failed\n");
+}
+
+/*
+ * @Function core_initialise
+ */
+int core_initialise(void *dev_handle, unsigned int int_heap_id, void *vxd_cb_ptr)
+{
+	struct vdecdd_dd_devconfig dev_cfg_local;
+	unsigned int num_pipes_local;
+	int ret;
+
+	if (is_core_initialized)
+		return IMG_ERROR_INVALID_PARAMETERS;
+
+	is_core_initialized = TRUE;
+
+	global_core_ctx = kzalloc(sizeof(*global_core_ctx), GFP_KERNEL);
+	if (!global_core_ctx) {
+		is_core_initialized = FALSE;
+		return IMG_ERROR_OUT_OF_MEMORY;
+	}
+
+	global_core_ctx->dev_ctx = kzalloc(sizeof(*global_core_ctx->dev_ctx), GFP_KERNEL);
+	if (!global_core_ctx->dev_ctx) {
+		kfree(global_core_ctx);
+		global_core_ctx = NULL;
+		is_core_initialized = FALSE;
+		return IMG_ERROR_OUT_OF_MEMORY;
+	}
+
+	/* Initialise device context. */
+	global_core_ctx->dev_ctx->dev_handle = dev_handle; /* v4L2 dev handle */
+	global_core_ctx->vxd_str_processed_cb = (vxd_cb)vxd_cb_ptr;
+
+	ret = decoder_initialise(global_core_ctx->dev_ctx, int_heap_id,
+				 &dev_cfg_local, &num_pipes_local,
+				 &global_core_ctx->dev_ctx->dec_context);
+	if (ret != IMG_SUCCESS)
+		goto decoder_init_error;
+
+	global_core_ctx->dev_ctx->internal_heap_id = int_heap_id;
+
+#ifdef DEBUG_DECODER_DRIVER
+	/* Dump codec config */
+	pr_info("Decode slots/core:  %d", dev_cfg_local.num_slots_per_pipe);
+#endif
+
+	lst_init(&global_core_ctx->core_str_ctx);
+
+	/* Ensure the resource manager is initialised.. */
+	ret = rman_initialise();
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto rman_init_error;
+
+	/* Create resource bucket.. */
+	ret = rman_create_bucket(&global_core_ctx->dev_ctx->res_buck_handle);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto create_bucket_error;
+
+	return IMG_SUCCESS;
+
+create_bucket_error:
+	rman_deinitialise();
+
+rman_init_error:
+	decoder_deinitialise(global_core_ctx->dev_ctx->dec_context);
+
+decoder_init_error:
+	kfree(global_core_ctx->dev_ctx);
+	global_core_ctx->dev_ctx = NULL;
+	kfree(global_core_ctx);
+	global_core_ctx = NULL;
+
+	is_core_initialized = FALSE;
+
+	return ret;
+}
+
+/*
+ * @Function    core_check_decoder_support
+ * @Description
+ * This function determines whether Decoder supports bitstream and
+ * configuration.
+ */
+static int
+core_check_decoder_support(const struct vdecdd_dddev_context *dd_dev_ctx,
+			   const struct vdec_str_configdata  *str_cfg_data,
+			   const struct vdec_comsequ_hdrinfo *prev_seq_hdrinfo,
+			   const struct bspp_pict_hdr_info *prev_pict_hdrinfo,
+			   const struct vdecdd_mapbuf_info *map_bufinfo,
+			   struct vdecdd_supp_check *supp_check)
+{
+	int ret;
+	struct vdec_unsupp_flags unsupported;
+	struct vdec_pict_rendinfo disp_pict_rend_info;
+
+	memset(&disp_pict_rend_info, 0, sizeof(struct vdec_pict_rendinfo));
+
+	/*
+	 * If output picture buffer information is provided create another
+	 * with properties required by bitstream so that it can be compared.
+	 */
+	if (supp_check->disp_pictbuf) {
+		struct vdec_pict_rend_config pict_rend_cfg;
+
+		memset(&pict_rend_cfg, 0, sizeof(pict_rend_cfg));
+
+		/*
+		 * Cannot validate the display picture buffer layout without
+		 * knowing the pixel format required for the output and the
+		 * sequence information.
+		 */
+		if (supp_check->comseq_hdrinfo && supp_check->op_cfg) {
+			pict_rend_cfg.coded_pict_size =
+				supp_check->comseq_hdrinfo->max_frame_size;
+
+			pict_rend_cfg.byte_interleave =
+					supp_check->disp_pictbuf->buf_config.byte_interleave;
+
+			pict_rend_cfg.packed =
+					supp_check->disp_pictbuf->buf_config.packed;
+
+			pict_rend_cfg.stride_alignment =
+					supp_check->disp_pictbuf->buf_config.stride_alignment;
+
+			/*
+			 * Recalculate render picture layout based upon
+			 * sequence and output config.
+			 */
+			vdecddutils_pictbuf_getinfo(str_cfg_data,
+						    &pict_rend_cfg,
+						    supp_check->op_cfg,
+						    &disp_pict_rend_info);
+		}
+	}
+	/* Check that the decoder supports the picture. */
+	ret = decoder_check_support(dd_dev_ctx->dec_context, str_cfg_data,
+				    supp_check->op_cfg,
+				    supp_check->disp_pictbuf,
+				    (disp_pict_rend_info.rendered_size) ?
+				    &disp_pict_rend_info : NULL,
+				    supp_check->comseq_hdrinfo,
+				    supp_check->pict_hdrinfo,
+				    prev_seq_hdrinfo,
+				    prev_pict_hdrinfo,
+				    supp_check->non_cfg_req,
+				    &unsupported,
+				    &supp_check->features);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS) {
+		if (ret == IMG_ERROR_NOT_SUPPORTED)
+			supp_check->unsupp_flags = unsupported;
+	}
+
+	return ret;
+}
+
+/*
+ * @Function  core_supported_features
+ */
+int core_supported_features(struct vdec_features *features)
+{
+	struct vdecdd_dddev_context *dd_dev_ctx;
+
+	VDEC_ASSERT(global_core_ctx);
+
+	dd_dev_ctx = global_core_ctx->dev_ctx;
+	VDEC_ASSERT(dd_dev_ctx);
+	if (!dd_dev_ctx)
+		return IMG_ERROR_NOT_INITIALISED;
+
+	return decoder_supported_features(dd_dev_ctx->dec_context, features);
+}
+
+/*
+ * @Function core_stream_stop
+ */
+int core_stream_stop(unsigned int res_str_id)
+{
+	int ret = IMG_SUCCESS;
+	struct vdecdd_str_unit *stop_unit;
+	struct vdecdd_ddstr_ctx *ddstr_ctx;
+	struct core_stream_context *core_str_ctx;
+
+	/*
+	 * Stream based messages without a device context
+	 * must have a stream ID.
+	 */
+	VDEC_ASSERT(res_str_id);
+
+	if (res_str_id == 0) {
+		pr_err("Invalid params passed to %s\n", __func__);
+		return IMG_ERROR_INVALID_PARAMETERS;
+	}
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	VDEC_ASSERT(core_str_ctx);
+
+	ddstr_ctx = core_str_ctx->dd_str_ctx;
+
+	/* Validate input arguments */
+	VDEC_ASSERT(ddstr_ctx);
+
+	/*
+	 * Disregard this stop request if the stream is currently
+	 * stopped or being stopped.
+	 */
+	if (ddstr_ctx->dd_str_state == VDECDD_STRSTATE_PLAYING) {
+		vdecddutils_create_strunit(&stop_unit, NULL);
+		if (!stop_unit) {
+			pr_err("Failed to allocate memory for stop unit\n");
+			return IMG_ERROR_OUT_OF_MEMORY;
+		}
+		memset(stop_unit, 0, sizeof(*stop_unit));
+
+		stop_unit->str_unit_type = VDECDD_STRUNIT_STOP;
+		stop_unit->str_unit_tag = NULL;
+		stop_unit->decode = FALSE;
+
+		/*
+		 * Since the stop is now to be passed to the decoder signal
+		 * that we're stopping.
+		 */
+		ddstr_ctx->dd_str_state = VDECDD_STRSTATE_STOPPING;
+		decoder_stream_process_unit(ddstr_ctx->dec_ctx, stop_unit);
+		core_str_ctx->stopped = TRUE;
+		vdecddutils_free_strunit(stop_unit);
+	}
+
+	return ret;
+}
+
+/*
+ * @Function              core_is_stream_idle
+ */
+static unsigned char core_is_stream_idle(struct vdecdd_ddstr_ctx *dd_str_ctx)
+{
+	unsigned char is_stream_idle;
+
+	is_stream_idle = decoder_is_stream_idle(dd_str_ctx->dec_ctx);
+
+	return is_stream_idle;
+}
+
+/*
+ * @Function              core_stream_destroy
+ */
+int core_stream_destroy(unsigned int res_str_id)
+{
+	struct vdecdd_ddstr_ctx *ddstr_ctx;
+	struct core_stream_context *core_str_ctx;
+	int ret;
+
+	/*
+	 * Stream based messages without a device context
+	 * must have a stream ID.
+	 */
+	VDEC_ASSERT(res_str_id);
+
+	if (res_str_id == 0) {
+		pr_err("Invalid params passed to %s\n", __func__);
+		return IMG_ERROR_INVALID_PARAMETERS;
+	}
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	VDEC_ASSERT(core_str_ctx);
+
+	ddstr_ctx = core_str_ctx->dd_str_ctx;
+
+	/* Validate input arguments */
+	VDEC_ASSERT(ddstr_ctx);
+
+	ret = core_stream_stop(res_str_id);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	lst_remove(&global_core_ctx->core_str_ctx, core_str_ctx);
+
+	/* Destroy stream if idle otherwise wait and do it later */
+	if (core_is_stream_idle(ddstr_ctx))
+		rman_free_resource(ddstr_ctx->res_handle);
+
+	pr_debug("Core stream destroy successfully\n");
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+static int
+core_picture_attach_resources(struct core_stream_context *core_str_ctx,
+			      struct vdecdd_str_unit *str_unit, unsigned char check)
+{
+	unsigned int ret = IMG_SUCCESS;
+
+	/*
+	 * Take sequence header from cache.
+	 * Note: sequence header id must be set in PICTURE_START unit
+	 */
+	str_unit->seq_hdr_info = resource_list_getbyid(&core_str_ctx->seq_hdr_list,
+						       str_unit->seq_hdr_id);
+
+	/* Check is not needed e.g. when freeing resources at stream destroy */
+	if (check && !str_unit->seq_hdr_info) {
+		pr_err("[USERSID=0x%08X] Sequence header not available for current picture while attaching",
+		       core_str_ctx->dd_str_ctx->str_config_data.user_str_id);
+		ret = IMG_ERROR_NOT_SUPPORTED;
+	}
+
+	return ret;
+}
+
+/*
+ * @Function core_handle_processed_unit
+ */
+static int core_handle_processed_unit(struct core_stream_context *c_str_ctx,
+				      struct vdecdd_str_unit *str_unit)
+{
+	struct bspp_bitstr_seg *bstr_seg;
+	struct vdecdd_ddstr_ctx *dd_str_ctx = c_str_ctx->dd_str_ctx;
+	int ret;
+	struct core_context *g_ctx = global_core_ctx;
+
+	pr_debug("%s stream unit type = %d\n", __func__, str_unit->str_unit_type);
+	/* check for type of the unit */
+	switch (str_unit->str_unit_type) {
+	case VDECDD_STRUNIT_SEQUENCE_START:
+		/* nothing to be done as sps is maintained till it changes */
+		break;
+
+	case VDECDD_STRUNIT_PICTURE_START:
+		/* Loop over bit stream segments.. */
+		bstr_seg = (struct bspp_bitstr_seg *)
+			lst_removehead(&str_unit->bstr_seg_list);
+
+		while (bstr_seg) {
+			lst_add(&c_str_ctx->vxd_dec_context->seg_list, bstr_seg);
+			if (bstr_seg->bstr_seg_flag & VDECDD_BSSEG_LASTINBUFF &&
+			    dd_str_ctx->dd_str_state != VDECDD_STRSTATE_STOPPED) {
+				struct vdecdd_ddbuf_mapinfo *ddbuf_map_info;
+				/* Get access to map info context.. */
+				ret = rman_get_resource(bstr_seg->bufmap_id, VDECDD_BUFMAP_TYPE_ID,
+							(void **)&ddbuf_map_info, NULL);
+				VDEC_ASSERT(ret == IMG_SUCCESS);
+				if (ret != IMG_SUCCESS)
+					return ret;
+
+				g_ctx->vxd_str_processed_cb(c_str_ctx->vxd_dec_context,
+					VXD_CB_STRUNIT_PROCESSED,
+					bstr_seg->bufmap_id);
+			}
+			/* Get next segment. */
+			bstr_seg = (struct bspp_bitstr_seg *)
+				lst_removehead(&str_unit->bstr_seg_list);
+		}
+		break;
+
+	case VDECDD_STRUNIT_PICTURE_END:
+		g_ctx->vxd_str_processed_cb(c_str_ctx->vxd_dec_context,
+			VXD_CB_PICT_END, 0xFFFF);
+		break;
+
+	case VDECDD_STRUNIT_STOP:
+		/*
+		 * Signal that the stream has been stopped in the
+		 * device driver.
+		 */
+		dd_str_ctx->dd_str_state = VDECDD_STRSTATE_STOPPED;
+
+		break;
+
+	default:
+		pr_err("Invalid stream unit type passed\n");
+		return IMG_ERROR_GENERIC_FAILURE;
+	}
+
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("[SID=0x%08X] [UTYPE=0x%08X] PROCESSED",
+		dd_str_ctx->res_str_id,
+		str_unit->str_unit_type);
+#endif
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+static int
+core_handle_decoded_picture(struct core_stream_context *core_str_ctx,
+			    struct vdecdd_picture *picture, unsigned int type)
+{
+	/* Pick the client image buffer. */
+	struct vdecdd_ddbuf_mapinfo *pictbuf_mapinfo = picture->disp_pict_buf.pict_buf;
+
+	VDEC_ASSERT(pictbuf_mapinfo);
+	if (!pictbuf_mapinfo)
+		return IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE;
+
+	global_core_ctx->vxd_str_processed_cb(core_str_ctx->vxd_dec_context,
+		(enum vxd_cb_type)type, pictbuf_mapinfo->buf_map_id);
+	return IMG_SUCCESS;
+}
+
+static int core_stream_processed_cb(void *handle, int cb_type, void *cb_item)
+{
+	int ret;
+	struct core_stream_context *core_str_ctx =
+		(struct core_stream_context *)handle;
+	VDEC_ASSERT(core_str_ctx);
+	if (!core_str_ctx) {
+		pr_err("NULL handle passed to core callback\n");
+		return IMG_ERROR_GENERIC_FAILURE;
+	}
+
+	pr_debug("%s callback type = %d\n", __func__, cb_type);
+	/* Based on callback type, retrieve the item */
+	switch (cb_type) {
+	case VXD_CB_STRUNIT_PROCESSED:
+	{
+		struct vdecdd_str_unit *str_unit =
+			(struct vdecdd_str_unit *)cb_item;
+		VDEC_ASSERT(str_unit);
+		if (!str_unit) {
+			pr_err("NULL item passed to core callback type STRUNIT_PROCESSED\n");
+			return IMG_ERROR_GENERIC_FAILURE;
+		}
+		ret = core_handle_processed_unit(core_str_ctx, str_unit);
+		if (ret != IMG_SUCCESS) {
+			pr_err("core_handle_processed_unit returned error\n");
+			return ret;
+		}
+		break;
+	}
+
+	case VXD_CB_PICT_DECODED:
+	case VXD_CB_PICT_DISPLAY:
+	case VXD_CB_PICT_RELEASE:
+	{
+		struct vdecdd_picture *picture = (struct vdecdd_picture *)cb_item;
+
+		if (!picture) {
+			pr_err("NULL item passed to core callback type PICTURE_DECODED\n");
+			return IMG_ERROR_GENERIC_FAILURE;
+		}
+		ret = core_handle_decoded_picture(core_str_ctx, picture, cb_type);
+		break;
+	}
+
+	case VXD_CB_STR_END:
+		global_core_ctx->vxd_str_processed_cb(core_str_ctx->vxd_dec_context,
+			(enum vxd_cb_type)cb_type, 0);
+		ret = IMG_SUCCESS;
+
+		break;
+
+	case VXD_CB_ERROR_FATAL:
+		/*
+		 * Whenever the error case occurs, we need to handle the error case.
+		 * Need to forward this error to v4l2 glue layer.
+		 */
+		global_core_ctx->vxd_str_processed_cb(core_str_ctx->vxd_dec_context,
+			(enum vxd_cb_type)cb_type, *((unsigned int *)cb_item));
+		ret = IMG_SUCCESS;
+		break;
+
+	default:
+		return 0;
+	}
+
+	return ret;
+}
+
+static int core_decoder_queries(void *handle, int query, void *item)
+{
+	struct core_stream_context *core_str_ctx =
+		(struct core_stream_context *)handle;
+	VDEC_ASSERT(core_str_ctx);
+	if (!core_str_ctx) {
+		pr_err("NULL handle passed to %s callback\n", __func__);
+		return IMG_ERROR_GENERIC_FAILURE;
+	}
+
+	switch (query) {
+	case DECODER_CORE_GET_RES_LIMIT:
+	{
+		unsigned int num_img_bufs;
+		unsigned int num_res;
+
+		num_img_bufs = resource_list_getnum(&core_str_ctx->pict_buf_list);
+
+		/* Return the number of internal resources. */
+		num_res = core_str_ctx->pict_resinfo.pict_res_num;
+
+		/* Return the minimum of the two. */
+		*((unsigned int *)item) = vdec_size_min(num_img_bufs, num_res);
+	}
+	break;
+
+	default:
+		return IMG_ERROR_GENERIC_FAILURE;
+	}
+	return IMG_SUCCESS;
+}
+
+static int
+core_free_common_picture_resource(struct core_stream_context *core_str_ctx,
+				  struct vdecdd_pict_resint *pict_resint)
+{
+	int ret = IMG_SUCCESS;
+
+	if (pict_resint->mb_param_buf && pict_resint->mb_param_buf->ddbuf_info.hndl_memory) {
+#ifdef DEBUG_DECODER_DRIVER
+		pr_info("mmu_free for buff_id[%d]\n",
+			pict_resint->mb_param_buf->ddbuf_info.buff_id);
+#endif
+		ret = mmu_free_mem(core_str_ctx->dd_str_ctx->mmu_str_handle,
+				   &pict_resint->mb_param_buf->ddbuf_info);
+		if (ret != IMG_SUCCESS)
+			pr_err("MMU_Free for MBParam buffer failed with error %u", ret);
+
+		kfree(pict_resint->mb_param_buf);
+		pict_resint->mb_param_buf = NULL;
+	}
+	return ret;
+}
+
+static int core_free_resbuf(struct vdecdd_ddbuf_mapinfo **buf_handle, void *mmu_handle)
+{
+	int ret = IMG_SUCCESS;
+	struct vdecdd_ddbuf_mapinfo *buf = *buf_handle;
+
+	if (buf) {
+		if (buf->ddbuf_info.hndl_memory) {
+			ret = mmu_free_mem(mmu_handle, &buf->ddbuf_info);
+			VDEC_ASSERT(ret == IMG_SUCCESS);
+		}
+		kfree(buf);
+		*buf_handle = NULL;
+	}
+	return ret;
+}
+
+/*
+ * @Function              core_free_picture_resource
+ */
+static int
+core_free_picture_resource(struct core_stream_context *core_strctx,
+			   struct vdecdd_pict_resint *pict_resint)
+{
+	int result = IMG_SUCCESS;
+
+	/* Check input arguments */
+	if (!core_strctx || !pict_resint) {
+		VDEC_ASSERT(0);
+		return -EINVAL;
+	}
+
+	result = core_free_common_picture_resource(core_strctx, pict_resint);
+
+	VDEC_ASSERT(core_strctx->std_spec_ops);
+	if (core_strctx->std_spec_ops->free_picture_resource)
+		core_strctx->std_spec_ops->free_picture_resource(core_strctx,
+			pict_resint);
+
+#ifdef SEQ_RES_NEEDED
+	if (pict_resint->seq_resint) {
+		resource_item_return(&pict_resint->seq_resint->ref_count);
+		pict_resint->seq_resint = 0;
+	}
+#endif
+
+	if (result == IMG_SUCCESS)
+		kfree(pict_resint);
+
+	return result;
+}
+
+/*
+ * @Function              core_free_sequence_resource
+ */
+#ifdef SEQ_RES_NEEDED
+static int
+core_free_common_sequence_resource(struct core_stream_context *core_strctx,
+				   struct vdecdd_seq_resint *seqres_int)
+{
+	int result;
+
+	result = core_free_resbuf(&seqres_int->err_pict_buf,
+				  core_strctx->dd_str_ctx->mmu_str_handle);
+	if (result != IMG_SUCCESS)
+		pr_err("MMU_Free for Error Recover Frame Store buffer failed with error %u",
+		       result);
+
+	return result;
+}
+
+static void
+core_free_sequence_resource(struct core_stream_context *core_strctx,
+			    struct vdecdd_seq_resint *seqres_int)
+{
+	VDEC_ASSERT(core_strctx->std_spec_ops);
+	core_free_common_sequence_resource(core_strctx, seqres_int);
+
+	if (core_strctx->std_spec_ops->free_sequence_resource)
+		core_strctx->std_spec_ops->free_sequence_resource(core_strctx, seqres_int);
+
+	kfree(seqres_int);
+}
+#endif
+
+/*
+ * @Function              core_stream_resource_deprecate
+ */
+static int core_stream_resource_deprecate(struct core_stream_context *core_str_ctx)
+{
+	struct vdecdd_pict_resint *picres_int;
+	int ret;
+
+	/* Free all "old" picture resources since these should now be unused. */
+	picres_int = lst_first(&core_str_ctx->old_pict_res_list);
+	while (picres_int) {
+		if (picres_int->ref_cnt != 0) {
+			pr_warn("[USERSID=0x%08X] Internal resource should be unused since it has been deprecated before",
+				core_str_ctx->dd_str_ctx->str_config_data.user_str_id);
+
+			picres_int = lst_next(picres_int);
+		} else {
+			struct vdecdd_pict_resint *picres_int_to_remove = picres_int;
+
+			picres_int = lst_next(picres_int);
+
+			lst_remove(&core_str_ctx->old_pict_res_list, picres_int_to_remove);
+			ret = core_free_picture_resource(core_str_ctx, picres_int_to_remove);
+			VDEC_ASSERT(ret == IMG_SUCCESS);
+			if (ret != IMG_SUCCESS)
+				return ret;
+		}
+	}
+
+	/* Move all "active" picture resources to the "old" list if they are still in use. */
+	picres_int = lst_removehead(&core_str_ctx->pict_res_list);
+	while (picres_int) {
+		/* Remove picture resource from the list. */
+		ret = resource_list_remove(&core_str_ctx->aux_pict_res_list, picres_int);
+
+		/* IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE is a valid return code
+		 * e.g. during reconfigure we are clearing the sPictBufferList list
+		 * and then try to remove the buffers again from the same list (empty now)
+		 * though core UNMAP_BUF messages
+		 */
+		if (ret != IMG_SUCCESS && ret != IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE) {
+			pr_err("[USERSID=0x%08X] Failed to remove picture resource",
+			       core_str_ctx->dd_str_ctx->str_config_data.user_str_id);
+			return ret;
+		}
+		/*
+		 * If the active resource is not being used, free now.
+		 * Otherwise add to the old list to be freed later.
+		 */
+		if (picres_int->ref_cnt == 0) {
+			ret = core_free_picture_resource(core_str_ctx, picres_int);
+			VDEC_ASSERT(ret == IMG_SUCCESS);
+			if (ret != IMG_SUCCESS)
+				return ret;
+		} else {
+			lst_add(&core_str_ctx->old_pict_res_list, picres_int);
+		}
+		picres_int = lst_removehead(&core_str_ctx->pict_res_list);
+	}
+
+	/* Reset the resource configuration. */
+	memset(&core_str_ctx->pict_resinfo, 0, sizeof(core_str_ctx->pict_resinfo));
+
+#ifdef SEQ_RES_NEEDED
+	{
+		struct vdecdd_seq_resint *seqres_int;
+
+		/* Free all "old" sequence resources since these should now be unused. */
+		seqres_int = lst_first(&core_str_ctx->old_seq_res_list);
+		while (seqres_int) {
+			if (seqres_int->ref_count != 0) {
+				pr_warn("[USERSID=0x%08X] Internal sequence resource should be unused since it has been deprecated before",
+					core_str_ctx->dd_str_ctx->str_config_data.user_str_id);
+				seqres_int = lst_next(seqres_int);
+			} else {
+				struct vdecdd_seq_resint *seqres_int_to_remove = seqres_int;
+
+				seqres_int = lst_next(seqres_int);
+
+				lst_remove(&core_str_ctx->old_seq_res_list, seqres_int_to_remove);
+				core_free_sequence_resource(core_str_ctx, seqres_int_to_remove);
+			}
+		}
+
+		/* Move all "active" sequence resources to the "old"
+		 * list if they are still in use.
+		 */
+		seqres_int = lst_removehead(&core_str_ctx->seq_res_list);
+		while (seqres_int) {
+			/*
+			 * If the active resource is not being used, free now.
+			 * Otherwise add to the old list to be freed later.
+			 */
+			seqres_int->ref_count == 0 ? core_free_sequence_resource(core_str_ctx,
+				seqres_int) :
+			lst_add(&core_str_ctx->old_seq_res_list, seqres_int);
+
+			seqres_int = lst_removehead(&core_str_ctx->seq_res_list);
+		}
+
+		/* Reset the resource configuration. */
+		memset(&core_str_ctx->seq_resinfo, 0, sizeof(core_str_ctx->seq_resinfo));
+	}
+#endif
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function              core_stream_resource_destroy
+ */
+static int core_stream_resource_destroy(struct core_stream_context *core_str_ctx)
+{
+	struct vdecdd_pict_resint *picres_int;
+	int ret;
+
+	/* Remove any "active" picture resources allocated for this stream. */
+	picres_int = lst_removehead(&core_str_ctx->pict_res_list);
+	while (picres_int) {
+		ret = core_free_picture_resource(core_str_ctx, picres_int);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			return ret;
+
+		picres_int = lst_removehead(&core_str_ctx->pict_res_list);
+	}
+
+	/* Remove any "old" picture resources allocated for this stream. */
+	picres_int = lst_removehead(&core_str_ctx->old_pict_res_list);
+	while (picres_int) {
+		ret = core_free_picture_resource(core_str_ctx, picres_int);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			return ret;
+
+		picres_int = lst_removehead(&core_str_ctx->old_pict_res_list);
+	}
+
+	/* Reset the resource configuration. */
+	memset(&core_str_ctx->pict_resinfo, 0, sizeof(core_str_ctx->pict_resinfo));
+
+#ifdef SEQ_RES_NEEDED
+	{
+		struct vdecdd_seq_resint *seqres_int;
+
+		/* Remove any "active" sequence resources allocated for this stream. */
+		seqres_int = lst_removehead(&core_str_ctx->seq_res_list);
+		while (seqres_int) {
+			core_free_sequence_resource(core_str_ctx, seqres_int);
+			seqres_int = lst_removehead(&core_str_ctx->seq_res_list);
+		}
+
+		/* Remove any "old" sequence resources allocated for this stream. */
+		seqres_int = lst_removehead(&core_str_ctx->old_seq_res_list);
+		while (seqres_int) {
+			core_free_sequence_resource(core_str_ctx, seqres_int);
+			seqres_int = lst_removehead(&core_str_ctx->old_seq_res_list);
+		}
+
+		/* Reset the resource configuration. */
+		memset(&core_str_ctx->seq_resinfo, 0, sizeof(core_str_ctx->seq_resinfo));
+	}
+#endif
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function core_fn_free_stream_unit
+ */
+static int core_fn_free_stream_unit(struct vdecdd_str_unit *str_unit, void *param)
+{
+	struct core_stream_context *core_str_ctx = (struct core_stream_context *)param;
+	unsigned int ret = IMG_SUCCESS;
+
+	/* Attach picture resources where required. */
+	if (str_unit->str_unit_type == VDECDD_STRUNIT_PICTURE_START)
+		/*
+		 * Do not force attachment because the resources can be
+		 * unattached yet, e.g. in case of not yet processed picture
+		 * units
+		 */
+		ret = core_picture_attach_resources(core_str_ctx, str_unit, FALSE);
+
+	str_unit->decode = FALSE;
+
+	return ret;
+}
+
+/*
+ * @Function  core_fn_free_stream
+ */
+static void core_fn_free_stream(void *param)
+{
+	int ret;
+	struct vdecdd_ddstr_ctx *dd_str_context;
+	struct vdecdd_dddev_context *dd_dev_ctx;
+	struct core_stream_context *core_str_ctx;
+
+	/* Validate input arguments */
+	VDEC_ASSERT(param);
+
+	core_str_ctx = (struct core_stream_context *)param;
+
+	dd_str_context = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_context);
+	if (!dd_str_context)
+		return;
+
+	dd_dev_ctx = dd_str_context->dd_dev_context;
+	VDEC_ASSERT(dd_dev_ctx);
+
+	if (!lst_empty(&core_str_ctx->str_unit_list)) {
+		/*
+		 * Try and empty the list. Since this function is tearing down the core stream,
+		 * test result using assert and continue to tidy-up as much as possible.
+		 */
+		ret = resource_list_empty(&core_str_ctx->str_unit_list, FALSE,
+					  (resource_pfn_freeitem)core_fn_free_stream_unit,
+					  core_str_ctx);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+	}
+
+	if (!lst_empty(&core_str_ctx->pict_buf_list)) {
+		/*
+		 * Try and empty the list. Since this function is tearing down the core stream,
+		 * test result using assert and continue to tidy-up as much as possible.
+		 */
+		ret = resource_list_empty(&core_str_ctx->pict_buf_list, TRUE, NULL, NULL);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+	}
+
+	if (!lst_empty(&core_str_ctx->aux_pict_res_list)) {
+		/*
+		 * Try and empty the list. Since this function is tearing down the core stream,
+		 * test result using assert and continue to tidy-up as much as possible.
+		 */
+		ret = resource_list_empty(&core_str_ctx->aux_pict_res_list, TRUE, NULL, NULL);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+	}
+
+	if (!lst_empty(&core_str_ctx->seq_hdr_list)) {
+		/*
+		 * Try and empty the list. Since this function is tearing down the core stream,
+		 * test result using assert and continue to tidy-up as much as possible.
+		 */
+		ret = resource_list_empty(&core_str_ctx->seq_hdr_list, FALSE, NULL, NULL);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+	}
+
+	/* Destroy stream in the Decoder. */
+	if (dd_str_context->dec_ctx) {
+		ret = decoder_stream_destroy(dd_str_context->dec_ctx, FALSE);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		dd_str_context->dec_ctx = NULL;
+	}
+
+	core_stream_resource_destroy(core_str_ctx);
+
+	/* Destroy the MMU context for this stream. */
+	if (dd_str_context->mmu_str_handle) {
+		ret = mmu_stream_destroy(dd_str_context->mmu_str_handle);
+
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		dd_str_context->mmu_str_handle = NULL;
+	}
+
+	/* Destroy the stream resources. */
+	if (dd_str_context->res_buck_handle) {
+		rman_destroy_bucket(dd_str_context->res_buck_handle);
+		dd_str_context->res_buck_handle = NULL;
+	}
+
+	/* Free stream context. */
+	kfree(dd_str_context);
+
+	/* Free the stream context. */
+	kfree(core_str_ctx);
+}
+
+/*
+ * @Function  core_is_unsupported
+ */
+static unsigned char core_is_unsupported(struct vdec_unsupp_flags *unsupp_flags)
+{
+	unsigned char unsupported = FALSE;
+
+	if (unsupp_flags->str_cfg || unsupp_flags->seq_hdr ||
+	    unsupp_flags->pict_hdr || unsupp_flags->str_opcfg ||
+	    unsupp_flags->op_bufcfg)
+		unsupported = TRUE;
+
+	return unsupported;
+}
+
+int core_stream_create(void *vxd_dec_ctx_arg,
+		       const struct vdec_str_configdata *str_cfg_data,
+		       unsigned int *res_str_id)
+{
+	int ret;
+	struct vdecdd_ddstr_ctx *dd_str_context;
+	struct vdecdd_supp_check supp_check;
+	struct vdecdd_dddev_context *dd_dev_ctx;
+	struct core_stream_context *core_str_ctx;
+
+	/* Validate input arguments */
+	VDEC_ASSERT(str_cfg_data);
+	VDEC_ASSERT(res_str_id);
+
+	VDEC_ASSERT(global_core_ctx);
+	dd_dev_ctx = global_core_ctx->dev_ctx;
+
+	VDEC_ASSERT(dd_dev_ctx);
+	if (!dd_dev_ctx)
+		return IMG_ERROR_NOT_INITIALISED;
+
+	/* Allocate Core Stream Context */
+	core_str_ctx = kzalloc(sizeof(*core_str_ctx), GFP_KERNEL);
+	if (!core_str_ctx)
+		return IMG_ERROR_OUT_OF_MEMORY;
+
+	core_str_ctx->core_ctx = global_core_ctx;
+	core_str_ctx->vxd_dec_context = (struct vxd_dec_ctx *)vxd_dec_ctx_arg;
+	/* register callback for firmware response */
+	core_str_ctx->vxd_dec_context->cb = (decode_cb)core_fw_response_cb;
+
+	lst_init(&core_str_ctx->pict_buf_list);
+	lst_init(&core_str_ctx->pict_res_list);
+	lst_init(&core_str_ctx->old_pict_res_list);
+	lst_init(&core_str_ctx->aux_pict_res_list);
+	lst_init(&core_str_ctx->seq_hdr_list);
+	lst_init(&core_str_ctx->str_unit_list);
+
+#ifdef SEQ_RES_NEEDED
+	lst_init(&core_str_ctx->seq_res_list);
+	lst_init(&core_str_ctx->old_seq_res_list);
+#endif
+
+	/* Allocate device stream context.. */
+	dd_str_context = kzalloc(sizeof(*dd_str_context), GFP_KERNEL);
+	VDEC_ASSERT(dd_str_context);
+	if (!dd_str_context) {
+		kfree(core_str_ctx);
+		core_str_ctx = NULL;
+		return IMG_ERROR_OUT_OF_MEMORY;
+	}
+
+	dd_str_context->dd_dev_context = dd_dev_ctx;
+	core_str_ctx->dd_str_ctx = dd_str_context;
+
+	/* Check stream configuration. */
+	memset(&supp_check, 0x0, sizeof(supp_check));
+	ret = core_check_decoder_support(dd_dev_ctx, str_cfg_data, NULL, NULL, NULL, &supp_check);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	if (core_is_unsupported(&supp_check.unsupp_flags)) {
+		ret = IMG_ERROR_NOT_SUPPORTED;
+		goto error;
+	}
+
+	/* Create a bucket for the resources.. */
+	ret = rman_create_bucket(&dd_str_context->res_buck_handle);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	/* Register the stream as a device resource.. */
+	ret = rman_register_resource(dd_dev_ctx->res_buck_handle,
+				     VDECDD_STREAM_TYPE_ID,
+				     core_fn_free_stream, core_str_ctx,
+				     &dd_str_context->res_handle,
+				     &dd_str_context->res_str_id);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	/* Create unique Stream Id */
+	dd_str_context->km_str_id = core_str_ctx->vxd_dec_context->stream.id;
+
+	/*
+	 * Create stream in the Decoder.
+	 * NOTE: this must take place first since it creates the MMU context.
+	 */
+	ret = decoder_stream_create(dd_dev_ctx->dec_context, *str_cfg_data,
+				    dd_str_context->km_str_id,
+				    &dd_str_context->mmu_str_handle,
+				    core_str_ctx->vxd_dec_context,
+				    core_str_ctx, &dd_str_context->dec_ctx,
+				    (void *)core_stream_processed_cb,
+				    (void *)core_decoder_queries);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	/* Setup stream context.. */
+	dd_str_context->str_config_data = *str_cfg_data;
+	dd_str_context->dd_str_state = VDECDD_STRSTATE_STOPPED;
+
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("[SID=0x%08X] New stream created [USERSID=0x%08X]",
+		dd_str_context->res_str_id, str_cfg_data->user_str_id);
+#endif
+
+	*res_str_id = dd_str_context->res_str_id;
+	if (str_cfg_data->vid_std > 0 &&  str_cfg_data->vid_std <= VDEC_STD_MAX) {
+		core_str_ctx->std_spec_ops = &std_specific_ops[str_cfg_data->vid_std - 1];
+	} else {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return IMG_ERROR_INVALID_PARAMETERS;
+	}
+
+	lst_add(&global_core_ctx->core_str_ctx, core_str_ctx);
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+
+error:
+	if (dd_str_context->res_handle)
+		rman_free_resource(dd_str_context->res_handle);
+	else
+		core_fn_free_stream(core_str_ctx);
+
+	return ret;
+}
+
+static int
+core_get_resource_availability(struct core_stream_context *core_str_ctx)
+{
+	unsigned int avail = ~0;
+
+	if (resource_list_getnumavail(&core_str_ctx->pict_buf_list) == 0)
+		avail &= ~CORE_AVAIL_PICTBUF;
+
+	if (resource_list_getnumavail(&core_str_ctx->aux_pict_res_list) == 0)
+		avail &= ~CORE_AVAIL_PICTRES;
+
+	if (global_avail_slots == 0)
+		avail &= ~CORE_AVAIL_CORE;
+
+	return avail;
+}
+
+static int
+core_stream_set_pictbuf_config(struct vdecdd_ddstr_ctx *dd_str_ctx,
+			       struct vdec_pict_bufconfig *pictbuf_cfg)
+{
+	int ret;
+
+	/* Validate input arguments */
+	VDEC_ASSERT(dd_str_ctx);
+	VDEC_ASSERT(pictbuf_cfg);
+
+	/*
+	 * If there are no buffers mapped or the configuration is not set
+	 * (only done when reconfiguring output) then calculate the output
+	 * picture buffer layout.
+	 */
+	if (dd_str_ctx->map_buf_info.num_buf == 0 ||
+	    dd_str_ctx->disp_pict_buf.buf_config.buf_size == 0) {
+		struct vdecdd_supp_check supp_check;
+		struct vdecdd_ddpict_buf disp_pictbuf;
+
+		memset(&disp_pictbuf, 0, sizeof(disp_pictbuf));
+
+		disp_pictbuf.buf_config = *pictbuf_cfg;
+
+		/*
+		 * Ensure that the external picture buffer information
+		 * is compatible with the hardware and convert to internal
+		 * driver representation.
+		 */
+		ret = vdecddutils_convert_buffer_config(&dd_str_ctx->str_config_data,
+							&disp_pictbuf.buf_config,
+							&disp_pictbuf.rend_info);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			goto error;
+
+		/*
+		 * Provide the current state for validation against the new
+		 * buffer configuration.
+		 */
+		memset(&supp_check, 0, sizeof(supp_check));
+		supp_check.disp_pictbuf = &disp_pictbuf;
+
+		if (dd_str_ctx->comseq_hdr_info.max_frame_size.width)
+			supp_check.comseq_hdrinfo = &dd_str_ctx->comseq_hdr_info;
+
+		if (dd_str_ctx->str_op_configured)
+			supp_check.op_cfg = &dd_str_ctx->opconfig;
+
+		ret = core_check_decoder_support(dd_str_ctx->dd_dev_context,
+						 &dd_str_ctx->str_config_data,
+						 &dd_str_ctx->prev_comseq_hdr_info,
+						 &dd_str_ctx->prev_pict_hdr_info,
+						 &dd_str_ctx->map_buf_info,
+						 &supp_check);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			goto error;
+
+		if (core_is_unsupported(&supp_check.unsupp_flags)) {
+			ret = IMG_ERROR_NOT_SUPPORTED;
+			goto error;
+		}
+
+		dd_str_ctx->disp_pict_buf = disp_pictbuf;
+	} else {
+		/*
+		 * Check configuration of buffer matches that for stream
+		 * including any picture buffers that are already mapped.
+		 */
+		if (memcmp(pictbuf_cfg, &dd_str_ctx->disp_pict_buf.buf_config,
+			   sizeof(*pictbuf_cfg))) {
+			/*
+			 * Configuration of output buffer doesn't match the
+			 * rest.
+			 */
+			pr_err("[SID=0x%08X] All output buffers must have the same properties.",
+			       dd_str_ctx->res_str_id);
+			ret = IMG_ERROR_INVALID_PARAMETERS;
+			goto error;
+		}
+	}
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+
+error:
+	return ret;
+}
+
+int
+core_stream_set_output_config(unsigned int res_str_id,
+			      struct vdec_str_opconfig *str_opcfg,
+			      struct vdec_pict_bufconfig *pict_bufcfg_handle)
+{
+	struct vdecdd_supp_check supp_check;
+	struct vdec_pict_bufconfig pict_buf_cfg;
+	struct vdec_pict_rendinfo disp_pict_rend_info;
+	int ret;
+
+	struct vdecdd_ddstr_ctx *dd_str_context;
+	struct core_stream_context      *core_str_ctx;
+
+	/*
+	 * Stream based messages without a device context
+	 * must have a stream ID.
+	 */
+	VDEC_ASSERT(res_str_id);
+
+	/* Get access to stream context */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID, (void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_context = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_context);
+	VDEC_ASSERT(str_opcfg);
+
+	memset(&supp_check, 0, sizeof(supp_check));
+	if (core_str_ctx->new_seq)
+		supp_check.comseq_hdrinfo = &dd_str_context->comseq_hdr_info;
+	else
+		supp_check.comseq_hdrinfo = NULL;
+
+	supp_check.op_cfg = str_opcfg;
+
+	/*
+	 * Validate stream output configuration against display
+	 * buffer properties if no new picture buffer configuration
+	 * is provided.
+	 */
+	if (!pict_bufcfg_handle) {
+		VDEC_ASSERT(dd_str_context->disp_pict_buf.rend_info.rendered_size);
+		supp_check.disp_pictbuf = &dd_str_context->disp_pict_buf;
+	}
+
+	/* Validate output configuration. */
+	ret = core_check_decoder_support(dd_str_context->dd_dev_context,
+					 &dd_str_context->str_config_data,
+					 &dd_str_context->prev_comseq_hdr_info,
+					 &dd_str_context->prev_pict_hdr_info,
+					 &dd_str_context->map_buf_info,
+					 &supp_check);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return IMG_SUCCESS;
+
+	if (core_is_unsupported(&supp_check.unsupp_flags))
+		return IMG_ERROR_NOT_SUPPORTED;
+
+	/* Update the stream output configuration. */
+	dd_str_context->opconfig = *str_opcfg;
+
+	/* Mark output as configured. */
+	dd_str_context->str_op_configured = TRUE;
+
+	if (pict_bufcfg_handle) {
+		/*
+		 * Clear/invalidate the latest picture buffer configuration
+		 * since it is easier to reuse the set function to calculate
+		 * for this new output configuration than to determine
+		 * compatibility. Keep a copy beforehand just in case the new
+		 * configuration is invalid.
+		 */
+		if (dd_str_context->disp_pict_buf.rend_info.rendered_size != 0) {
+			pict_buf_cfg = dd_str_context->disp_pict_buf.buf_config;
+			disp_pict_rend_info = dd_str_context->disp_pict_buf.rend_info;
+
+			memset(&dd_str_context->disp_pict_buf.buf_config, 0,
+			       sizeof(dd_str_context->disp_pict_buf.buf_config));
+			memset(&dd_str_context->disp_pict_buf.rend_info, 0,
+			       sizeof(dd_str_context->disp_pict_buf.rend_info));
+		}
+
+		/*
+		 * Recalculate the picture buffer internal layout from the
+		 * externalconfiguration. These settings provided by the
+		 * allocator should be adhered to since the display process
+		 * will expect the decoder to use them.
+		 * If the configuration is invalid we need to leave the
+		 * decoder state as it was before.
+		 */
+		ret = core_stream_set_pictbuf_config(dd_str_context, pict_bufcfg_handle);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS && dd_str_context->disp_pict_buf.rend_info.rendered_size
+		    != 0) {
+			/* Restore old picture buffer configuration */
+			dd_str_context->disp_pict_buf.buf_config =
+				pict_buf_cfg;
+			dd_str_context->disp_pict_buf.rend_info =
+				disp_pict_rend_info;
+			return ret;
+		}
+	} else if (core_is_unsupported(&supp_check.unsupp_flags)) {
+		return IMG_ERROR_NOT_SUPPORTED;
+	}
+
+	/* Return success.. */
+	return ret;
+}
+
+/*
+ * @Function core_stream_play
+ */
+int core_stream_play(unsigned int res_str_id)
+{
+	int ret;
+	struct vdecdd_ddstr_ctx *dd_str_context;
+	struct core_stream_context *core_str_ctx;
+	/* Picture buffer layout to use for decoding. */
+	struct vdecdd_ddpict_buf *disp_pict_buf;
+	struct vdec_str_opconfig *op_cfg;
+	struct vdecdd_supp_check supp_check;
+
+	/*
+	 * Stream based messages without a device context
+	 * must have a stream ID.
+	 */
+	VDEC_ASSERT(res_str_id);
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_context = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_context);
+
+	/* Ensure we are stopped. */
+	VDEC_ASSERT(dd_str_context->dd_str_state == VDECDD_STRSTATE_STOPPED);
+
+	/* Set "playing". */
+	dd_str_context->dd_str_state = VDECDD_STRSTATE_PLAYING;
+
+	/* set that is it not yet in closed GOP */
+	core_str_ctx->no_prev_refs_used = TRUE;
+
+	disp_pict_buf = dd_str_context->disp_pict_buf.rend_info.rendered_size ?
+		&dd_str_context->disp_pict_buf : NULL;
+	op_cfg = dd_str_context->str_op_configured ?
+		&dd_str_context->opconfig : NULL;
+
+	if (disp_pict_buf && op_cfg) {
+		VDEC_ASSERT(!disp_pict_buf->pict_buf);
+
+		if (memcmp(&core_str_ctx->op_cfg, op_cfg,
+			   sizeof(core_str_ctx->op_cfg)) ||
+			memcmp(&core_str_ctx->disp_pict_buf, disp_pict_buf,
+			       sizeof(core_str_ctx->disp_pict_buf)))
+			core_str_ctx->new_op_cfg = TRUE;
+
+		core_str_ctx->disp_pict_buf = *disp_pict_buf;
+		core_str_ctx->op_cfg = *op_cfg;
+
+		core_str_ctx->opcfg_set = TRUE;
+	} else {
+		core_str_ctx->opcfg_set = FALSE;
+		/* Must not be decoding without output configuration */
+		VDEC_ASSERT(0);
+	}
+
+	memset(&supp_check, 0, sizeof(supp_check));
+
+	if (vdec_size_nz(core_str_ctx->comseq_hdr_info.max_frame_size))
+		supp_check.comseq_hdrinfo = &core_str_ctx->comseq_hdr_info;
+
+	if (core_str_ctx->opcfg_set) {
+		supp_check.op_cfg = &core_str_ctx->op_cfg;
+		supp_check.disp_pictbuf = &core_str_ctx->disp_pict_buf;
+	}
+	supp_check.non_cfg_req = TRUE;
+	ret = core_check_decoder_support(dd_str_context->dd_dev_context,
+					 &dd_str_context->str_config_data,
+					 &dd_str_context->prev_comseq_hdr_info,
+					 &dd_str_context->prev_pict_hdr_info,
+					 &dd_str_context->map_buf_info,
+					 &supp_check);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function  core_deinitialise
+ */
+int core_deinitialise(void)
+{
+	struct vdecdd_dddev_context *dd_dev_ctx;
+	int ret;
+
+	dd_dev_ctx = global_core_ctx->dev_ctx;
+	VDEC_ASSERT(dd_dev_ctx);
+	if (!dd_dev_ctx)
+		return IMG_ERROR_NOT_INITIALISED;
+
+	ret = decoder_deinitialise(dd_dev_ctx->dec_context);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+
+	/* Free context resources.. */
+	rman_destroy_bucket(dd_dev_ctx->res_buck_handle);
+
+	rman_deinitialise();
+
+	kfree(dd_dev_ctx);
+
+	global_core_ctx->dev_ctx = NULL;
+
+	kfree(global_core_ctx);
+	global_core_ctx = NULL;
+
+	is_core_initialized = FALSE;
+
+	pr_debug("Core deinitialise successfully\n");
+	return IMG_SUCCESS;
+}
+
+static int core_get_mb_num(unsigned int width, unsigned int height)
+{
+	/*
+	 * Calculate the number of MBs needed for current video
+	 * sequence settings.
+	 */
+	unsigned int width_mb  = ALIGN(width, VDEC_MB_DIMENSION) / VDEC_MB_DIMENSION;
+	unsigned int height_mb = ALIGN(height, 2 * VDEC_MB_DIMENSION) / VDEC_MB_DIMENSION;
+
+	return width_mb * height_mb;
+}
+
+static int core_common_bufs_getsize(struct core_stream_context *core_str_ctx,
+				    const struct vdec_comsequ_hdrinfo *comseq_hdrinfo,
+				    struct vdec_pict_size *max_pict_size,
+				    struct core_pict_bufsize_info     *size_info,
+				    struct core_seq_resinfo  *seq_res_info,
+				    unsigned char *res_needed)
+{
+	enum vdec_vid_std vid_std = core_str_ctx->dd_str_ctx->str_config_data.vid_std;
+	unsigned int std_idx = vid_std - 1;
+	unsigned int mb_num = 0;
+
+	if (core_str_ctx->dd_str_ctx->str_config_data.vid_std >= VDEC_STD_MAX)
+		return IMG_ERROR_GENERIC_FAILURE;
+
+	/* Reset the MB parameters buffer size. */
+	size_info->mbparams_bufsize = 0;
+
+	if (mbparam_allocinfo[std_idx].alloc_mbparam_bufs) {
+		*res_needed = TRUE;
+
+		/*
+		 * Calculate the number of MBs needed for current video
+		 * sequence settings.
+		 */
+		mb_num = core_get_mb_num(max_pict_size->width, max_pict_size->height);
+
+		/* Calculate the final number of MBs needed. */
+		mb_num += mbparam_allocinfo[std_idx].overalloc_mbnum;
+
+		/* Calculate the MB params buffer size. */
+		size_info->mbparams_bufsize = mb_num * mbparam_allocinfo[std_idx].mbparam_size;
+
+		/* Adjust the buffer size for MSVDX. */
+		vdecddutils_buf_vxd_adjust_size(&size_info->mbparams_bufsize);
+
+		if (comseq_hdrinfo->separate_chroma_planes)
+			size_info->mbparams_bufsize *= 3;
+	}
+
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function core_pict_res_getinfo
+ */
+static int
+core_pict_res_getinfo(struct core_stream_context *core_str_ctx,
+		      const struct vdec_comsequ_hdrinfo *comseq_hdrinfo,
+		      const struct vdec_str_opconfig *op_cfg,
+		      const struct vdecdd_ddpict_buf *disp_pictbuf,
+		      struct core_pict_resinfo *pict_resinfo,
+		      struct core_seq_resinfo *seq_resinfo)
+{
+	struct vdec_pict_size coded_pict_size;
+	struct dec_ctx *decctx;
+	unsigned char res_needed = FALSE;
+	int ret;
+
+	/* Reset the picture resource info. */
+	memset(pict_resinfo, 0, sizeof(*pict_resinfo));
+
+	coded_pict_size = comseq_hdrinfo->max_frame_size;
+
+	VDEC_ASSERT(core_str_ctx->std_spec_ops);
+	if (core_str_ctx->std_spec_ops->bufs_get_size)
+		core_str_ctx->std_spec_ops->bufs_get_size(core_str_ctx, comseq_hdrinfo,
+			&coded_pict_size,
+			&pict_resinfo->size_info, seq_resinfo, &res_needed);
+
+	/* If any picture resources are needed... */
+	if (res_needed) {
+		/* Get the number of resources required. */
+		ret = vdecddutils_get_minrequired_numpicts
+							(&core_str_ctx->dd_str_ctx->str_config_data,
+							  comseq_hdrinfo, op_cfg,
+							  &pict_resinfo->pict_res_num);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			return ret;
+
+		decctx = (struct dec_ctx *)global_core_ctx->dev_ctx->dec_context;
+
+		if (core_str_ctx->dd_str_ctx->str_config_data.vid_std == VDEC_STD_HEVC)
+			pict_resinfo->pict_res_num += decctx->dev_cfg->num_slots_per_pipe - 1;
+		else
+			pict_resinfo->pict_res_num +=
+				decctx->num_pipes * decctx->dev_cfg->num_slots_per_pipe - 1;
+	}
+
+	return IMG_SUCCESS;
+}
+
+static int core_alloc_resbuf(struct vdecdd_ddbuf_mapinfo **buf_handle,
+			     unsigned int size, void *mmu_handle,
+			     struct vxdio_mempool mem_pool)
+{
+	int ret;
+	struct vdecdd_ddbuf_mapinfo *buf;
+
+	*buf_handle = kzalloc(sizeof(**buf_handle), GFP_KERNEL);
+	buf = *buf_handle;
+	VDEC_ASSERT(buf);
+	if (buf) {
+		buf->mmuheap_id = MMU_HEAP_STREAM_BUFFERS;
+#ifdef DEBUG_DECODER_DRIVER
+		pr_info("%s:%d calling MMU_StreamMalloc", __func__, __LINE__);
+#endif
+		ret = mmu_stream_alloc(mmu_handle, buf->mmuheap_id,
+				       mem_pool.mem_heap_id,
+				       mem_pool.mem_attrib, size,
+				       DEV_MMU_PAGE_SIZE,
+				       &buf->ddbuf_info);
+
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			ret = IMG_ERROR_OUT_OF_MEMORY;
+	} else {
+		ret = IMG_ERROR_OUT_OF_MEMORY;
+	}
+	return ret;
+}
+
+#ifdef SEQ_RES_NEEDED
+static int core_alloc_common_sequence_buffers(struct core_stream_context *core_str_ctx,
+					      struct vdecdd_seq_resint *seqres_int,
+					      struct vxdio_mempool mem_pool,
+					      struct core_seq_resinfo *seqres_info,
+					      struct core_pict_resinfo *pictres_info,
+					      const struct vdec_str_opconfig *op_cfg,
+					      const struct vdecdd_ddpict_buf *disp_pict_buf)
+{
+	int ret = IMG_SUCCESS;
+#ifdef ERROR_CONCEALMENT
+	enum vdec_vid_std vid_std = core_str_ctx->dd_str_ctx->str_config_data.vid_std;
+	unsigned int std_idx = vid_std - 1;
+	struct vidio_ddbufinfo *err_buf_info;
+
+	/* Allocate error concealment pattern frame for current sequence */
+	if (err_recovery_frame_info[std_idx].enabled) {
+		struct vdec_pict_bufconfig buf_config;
+		unsigned int size;
+
+		buf_config = disp_pict_buf->buf_config;
+		size = buf_config.coded_width * buf_config.coded_height;
+
+		if (err_recovery_frame_info[std_idx].max_size > size) {
+			seqres_int->err_pict_buf = kzalloc(sizeof(*seqres_int->err_pict_buf),
+							   GFP_KERNEL);
+			VDEC_ASSERT(seqres_int->err_pict_buf);
+			if (!seqres_int->err_pict_buf)
+				return IMG_ERROR_OUT_OF_MEMORY;
+
+			seqres_int->err_pict_buf->mmuheap_id = MMU_HEAP_STREAM_BUFFERS;
+
+#ifdef DEBUG_DECODER_DRIVER
+			pr_info("===== %s:%d calling MMU_StreamMalloc", __func__, __LINE__);
+#endif
+			ret = mmu_stream_alloc(core_str_ctx->dd_str_ctx->mmu_str_handle,
+					       seqres_int->err_pict_buf->mmuheap_id,
+					       mem_pool.mem_heap_id,
+					       (enum sys_emem_attrib)(mem_pool.mem_attrib |
+						       SYS_MEMATTRIB_CPU_WRITE),
+					       buf_config.buf_size,
+					       DEV_MMU_PAGE_ALIGNMENT,
+					       &seqres_int->err_pict_buf->ddbuf_info);
+			if (ret != IMG_SUCCESS)
+				return IMG_ERROR_OUT_OF_MEMORY;
+
+			/* make grey pattern - luma & chroma at mid-rail */
+			err_buf_info = &seqres_int->err_pict_buf->ddbuf_info;
+			if (op_cfg->pixel_info.mem_pkg == PIXEL_BIT10_MP) {
+				unsigned int *out = (unsigned int *)err_buf_info->cpu_virt;
+				unsigned int i;
+
+				for (i = 0; i < err_buf_info->buf_size / sizeof(unsigned int); i++)
+					/* See PIXEL_BIT10_MP layout definition */
+					out[i] = 0x20080200;
+			} else {
+				/* Note: Setting 0x80 also gives grey pattern
+				 * for 10bit upacked MSB format.
+				 */
+				memset(err_buf_info->cpu_virt, 0x80, err_buf_info->buf_size);
+			}
+		}
+	}
+#endif
+	return ret;
+}
+#endif
+
+/*
+ * @Function              core_do_resource_realloc
+ */
+static unsigned char core_do_resource_realloc(struct core_stream_context *core_str_ctx,
+					      struct core_pict_resinfo *pictres_info,
+					      struct core_seq_resinfo *seqres_info)
+{
+	VDEC_ASSERT(core_str_ctx->std_spec_ops);
+	/* If buffer sizes are sufficient and only the greater number of resources is needed... */
+	if (core_str_ctx->pict_resinfo.size_info.mbparams_bufsize >=
+		pictres_info->size_info.mbparams_bufsize &&
+		(core_str_ctx->std_spec_ops->is_stream_resource_suitable ?
+		core_str_ctx->std_spec_ops->is_stream_resource_suitable(pictres_info,
+		&core_str_ctx->pict_resinfo,
+		seqres_info, &core_str_ctx->seq_resinfo) : TRUE) &&
+		core_str_ctx->pict_resinfo.pict_res_num < pictres_info->pict_res_num)
+		/* ...full internal resource reallocation is not required. */
+		return FALSE;
+
+	/* Otherwise request full internal resource reallocation. */
+	return TRUE;
+}
+
+/*
+ * @Function              core_is_stream_resource_suitable
+ */
+static unsigned char core_is_stream_resource_suitable
+		(struct core_stream_context *core_str_ctx,
+		 const struct vdec_comsequ_hdrinfo *comseq_hdrinfo,
+		 const struct vdec_str_opconfig *op_cfg,
+		 const struct vdecdd_ddpict_buf *disp_pict_buf,
+		 struct core_pict_resinfo *pictres_info,
+		 struct core_seq_resinfo *seqres_info_ptr)
+{
+	int ret;
+	struct core_pict_resinfo aux_pictes_info;
+	struct core_pict_resinfo    *aux_pictes_info_ptr;
+	struct core_seq_resinfo seqres_info;
+
+	/* If resource info is needed externally, just use it. Otherwise use internal structure. */
+	if (pictres_info)
+		aux_pictes_info_ptr = pictres_info;
+	else
+		aux_pictes_info_ptr = &aux_pictes_info;
+
+	if (!seqres_info_ptr)
+		seqres_info_ptr = &seqres_info;
+
+	/* Get the resource info for current settings. */
+	ret = core_pict_res_getinfo(core_str_ctx, comseq_hdrinfo, op_cfg, disp_pict_buf,
+				    aux_pictes_info_ptr, seqres_info_ptr);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return FALSE;
+
+	VDEC_ASSERT(core_str_ctx->std_spec_ops);
+	if (core_str_ctx->std_spec_ops->is_stream_resource_suitable) {
+		if (!core_str_ctx->std_spec_ops->is_stream_resource_suitable
+					(aux_pictes_info_ptr,
+					 &core_str_ctx->pict_resinfo,
+					 seqres_info_ptr, &core_str_ctx->seq_resinfo))
+			return FALSE;
+	}
+
+	/* Check the number of picture resources required against the current number. */
+	if (aux_pictes_info_ptr->pict_res_num > core_str_ctx->pict_resinfo.pict_res_num)
+		return FALSE;
+
+	return TRUE;
+}
+
+static int core_alloc_common_pict_buffers(struct core_stream_context *core_str_ctx,
+					  struct vdecdd_pict_resint *pictres_int,
+					  struct vxdio_mempool mem_pool,
+					  struct core_pict_resinfo *pictres_info)
+{
+	int ret = IMG_SUCCESS;
+
+	/* If MB params buffers are needed... */
+	if (pictres_info->size_info.mbparams_bufsize > 0)
+		/* Allocate the MB parameters buffer info structure. */
+		ret = core_alloc_resbuf(&pictres_int->mb_param_buf,
+					pictres_info->size_info.mbparams_bufsize,
+					core_str_ctx->dd_str_ctx->mmu_str_handle,
+					mem_pool);
+
+	return ret;
+}
+
+/*
+ * @Function              core_stream_resource_create
+ */
+static int core_stream_resource_create(struct core_stream_context *core_str_ctx,
+				       unsigned char closed_gop, unsigned int mem_heap_id,
+				       const struct vdec_comsequ_hdrinfo *comseq_hdrinfo,
+				       const struct vdec_str_opconfig *op_cfg,
+				       const struct vdecdd_ddpict_buf *disp_pict_buf)
+{
+	struct vdecdd_pict_resint *pictres_int = NULL;
+	int ret = IMG_SUCCESS;
+	unsigned int i, start_cnt = 0;
+	struct core_pict_resinfo pictres_info;
+	struct vdecdd_seq_resint *seqres_int = NULL;
+	struct core_seq_resinfo seqres_info;
+	struct vxdio_mempool mem_pool;
+
+	mem_pool.mem_heap_id = mem_heap_id;
+	mem_pool.mem_attrib = (enum sys_emem_attrib)(SYS_MEMATTRIB_UNCACHED
+				| SYS_MEMATTRIB_WRITECOMBINE | SYS_MEMATTRIB_INTERNAL);
+
+#ifdef SEQ_RES_NEEDED
+	seqres_int = lst_first(&core_str_ctx->seq_res_list);
+#endif
+	/*
+	 * Clear the reconstructed picture buffer layout if the previous
+	 * references are no longer used. Only under these circumstances
+	 * should the bitstream resolution change.
+	 */
+	if (closed_gop) {
+		memset(&core_str_ctx->recon_pictbuf.rend_info, 0,
+		       sizeof(core_str_ctx->recon_pictbuf.rend_info));
+		memset(&core_str_ctx->coded_pict_size, 0, sizeof(core_str_ctx->coded_pict_size));
+	} else {
+		if (vdec_size_ne(core_str_ctx->coded_pict_size, comseq_hdrinfo->max_frame_size)) {
+			VDEC_ASSERT(FALSE);
+			pr_err("Coded picture size changed within the closed GOP (i.e. mismatched references)");
+		}
+	}
+
+	/* If current buffers are not suitable for specified VSH/Output config... */
+	if (!core_is_stream_resource_suitable(core_str_ctx, comseq_hdrinfo,
+					      op_cfg, disp_pict_buf, &pictres_info,
+					      &seqres_info)) {
+		/* If full internal resource reallocation is needed... */
+		if (core_do_resource_realloc(core_str_ctx, &pictres_info, &seqres_info)) {
+			/*
+			 * Mark all the active resources as deprecated and
+			 * free-up where no longer used.
+			 */
+			core_stream_resource_deprecate(core_str_ctx);
+		} else {
+			/* Use current buffer size settings. */
+			pictres_info.size_info = core_str_ctx->pict_resinfo.size_info;
+			seqres_info = core_str_ctx->seq_resinfo;
+
+			/* Set start counter to only allocate the number of
+			 * resources that are missing.
+			 */
+			start_cnt = core_str_ctx->pict_resinfo.pict_res_num;
+		}
+
+#ifdef SEQ_RES_NEEDED
+		/* allocate sequence resources */
+		{
+			seqres_int = kzalloc(sizeof(*seqres_int), GFP_KERNEL);
+			VDEC_ASSERT(seqres_int);
+			if (!seqres_int)
+				goto err_out_of_memory;
+
+			lst_add(&core_str_ctx->seq_res_list, seqres_int);
+			/* Allocate sequence buffers common for all standards. */
+			ret = core_alloc_common_sequence_buffers
+							(core_str_ctx, seqres_int, mem_pool,
+							 &seqres_info,
+							 &pictres_info, op_cfg, disp_pict_buf);
+			if (ret != IMG_SUCCESS)
+				goto err_out_of_memory;
+
+			VDEC_ASSERT(core_str_ctx->std_spec_ops);
+			if (core_str_ctx->std_spec_ops->alloc_sequence_buffers) {
+				ret = core_str_ctx->std_spec_ops->alloc_sequence_buffers
+							(core_str_ctx, seqres_int,
+							 mem_pool, &seqres_info);
+				if (ret != IMG_SUCCESS)
+					goto err_out_of_memory;
+			}
+		}
+#endif
+		/* Allocate resources for current settings. */
+		for (i = start_cnt; i < pictres_info.pict_res_num; i++) {
+			/* Allocate the picture resources structure. */
+			pictres_int = kzalloc(sizeof(*pictres_int), GFP_KERNEL);
+			VDEC_ASSERT(pictres_int);
+			if (!pictres_int)
+				goto err_out_of_memory;
+
+			/* Allocate picture buffers common for all standards. */
+			ret = core_alloc_common_pict_buffers(core_str_ctx, pictres_int,
+							     mem_pool, &pictres_info);
+			if (ret != IMG_SUCCESS)
+				goto err_out_of_memory;
+
+			/* Allocate standard specific picture buffers. */
+			VDEC_ASSERT(core_str_ctx->std_spec_ops);
+			if (core_str_ctx->std_spec_ops->alloc_picture_buffers) {
+				ret = core_str_ctx->std_spec_ops->alloc_picture_buffers
+							(core_str_ctx, pictres_int,
+							 mem_pool, &pictres_info);
+				if (ret != IMG_SUCCESS)
+					goto err_out_of_memory;
+			}
+
+			/* attach sequence resources */
+#ifdef SEQ_RES_NEEDED
+			resource_item_use(&seqres_int->ref_count);
+			pictres_int->seq_resint = seqres_int;
+#endif
+			lst_add(&core_str_ctx->pict_res_list, pictres_int);
+			core_str_ctx->pict_resinfo.pict_res_num++;
+		}
+	}
+
+	/*
+	 * When demand for picture resources reduces (in quantity) the extra buffers
+	 * are still retained. Preserve the existing count in case the demand increases
+	 * again, at which time these residual buffers won't need to be reallocated.
+	 */
+	pictres_info.pict_res_num = core_str_ctx->pict_resinfo.pict_res_num;
+
+	/* Store the current resource config. */
+	core_str_ctx->pict_resinfo = pictres_info;
+	core_str_ctx->seq_resinfo = seqres_info;
+
+	pictres_int = lst_first(&core_str_ctx->pict_res_list);
+	while (pictres_int) {
+		/*
+		 * Increment the reference count to indicate that this resource is also
+		 * held by plant until it is added to the Scheduler list. If the resource has
+		 * not just been created it might already be in circulation.
+		 */
+		resource_item_use(&pictres_int->ref_cnt);
+#ifdef SEQ_RES_NEEDED
+		/* attach sequence resources */
+		resource_item_use(&seqres_int->ref_count);
+		pictres_int->seq_resint = seqres_int;
+#endif
+		/* Add the internal picture resources to the list. */
+		ret = resource_list_add_img(&core_str_ctx->aux_pict_res_list,
+					    pictres_int, 0, &pictres_int->ref_cnt);
+
+		pictres_int = lst_next(pictres_int);
+	}
+
+	/*
+	 * Set the reconstructed buffer properties if they
+	 * may have been changed.
+	 */
+	if (core_str_ctx->recon_pictbuf.rend_info.rendered_size == 0) {
+		core_str_ctx->recon_pictbuf.rend_info =
+			disp_pict_buf->rend_info;
+		core_str_ctx->recon_pictbuf.buf_config =
+			disp_pict_buf->buf_config;
+		core_str_ctx->coded_pict_size = comseq_hdrinfo->max_frame_size;
+	} else {
+		if (memcmp(&disp_pict_buf->rend_info,
+			   &core_str_ctx->recon_pictbuf.rend_info,
+			   sizeof(core_str_ctx->recon_pictbuf.rend_info))) {
+			/*
+			 * Reconstructed picture buffer information has changed
+			 * during a closed GOP.
+			 */
+			VDEC_ASSERT
+			("Reconstructed picture buffer information cannot change within a GOP"
+				 == NULL);
+			pr_err("Reconstructed picture buffer information cannot change within a GOP.");
+			return IMG_ERROR_GENERIC_FAILURE;
+		}
+	}
+
+	/*
+	 * When demand for picture resources reduces (in quantity) the extra buffers
+	 * are still retained. Preserve the existing count in case the demand increases
+	 * again, at which time these residual buffers won't need to be reallocated.
+	 */
+	pictres_info.pict_res_num = core_str_ctx->pict_resinfo.pict_res_num;
+
+	/* Store the current resource config. */
+	core_str_ctx->pict_resinfo = pictres_info;
+	core_str_ctx->seq_resinfo = seqres_info;
+
+	return IMG_SUCCESS;
+
+	/* Handle out of memory errors. */
+err_out_of_memory:
+	/* Free resources being currently allocated. */
+	if (pictres_int) {
+		core_free_common_picture_resource(core_str_ctx, pictres_int);
+		if (core_str_ctx->std_spec_ops->free_picture_resource)
+			core_str_ctx->std_spec_ops->free_picture_resource(core_str_ctx,
+				pictres_int);
+
+		kfree(pictres_int);
+	}
+
+#ifdef SEQ_RES_NEEDED
+	if (seqres_int) {
+		core_free_common_sequence_resource(core_str_ctx, seqres_int);
+
+		if (core_str_ctx->std_spec_ops->free_sequence_resource)
+			core_str_ctx->std_spec_ops->free_sequence_resource(core_str_ctx,
+				seqres_int);
+
+		VDEC_ASSERT(lst_last(&core_str_ctx->seq_res_list) == seqres_int);
+		lst_remove(&core_str_ctx->seq_res_list, seqres_int);
+		kfree(seqres_int);
+	}
+#endif
+
+	/* Free all the other resources. */
+	core_stream_resource_destroy(core_str_ctx);
+
+	pr_err("[USERSID=0x%08X] Core not able to allocate stream resources due to lack of memory",
+	       core_str_ctx->dd_str_ctx->str_config_data.user_str_id);
+
+	return IMG_ERROR_OUT_OF_MEMORY;
+}
+
+static int
+core_reconfigure_recon_pictbufs(struct core_stream_context *core_str_ctx,
+				unsigned char no_references)
+{
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	int ret;
+
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+	VDEC_ASSERT(dd_str_ctx->str_op_configured);
+
+	/* Re-configure the internal picture buffers now that none are held. */
+	ret = core_stream_resource_create(core_str_ctx, no_references,
+					  dd_str_ctx->dd_dev_context->internal_heap_id,
+					  &dd_str_ctx->comseq_hdr_info,
+					  &dd_str_ctx->opconfig,
+					  &dd_str_ctx->disp_pict_buf);
+	return ret;
+}
+
+/*
+ * @Function              core_picture_prepare
+ */
+static int core_picture_prepare(struct core_stream_context *core_str_ctx,
+				struct vdecdd_str_unit *str_unit)
+{
+	int ret = IMG_SUCCESS;
+	struct vdecdd_picture *pict_local = NULL;
+	unsigned int avail = 0;
+	unsigned char need_pict_res;
+
+	/*
+	 * For normal decode, setup picture data.
+	 * Preallocate the picture structure.
+	 */
+	pict_local = kzalloc(sizeof(*pict_local), GFP_KERNEL);
+	if (!pict_local)
+		return IMG_ERROR_OUT_OF_MEMORY;
+
+	/* Determine whether the picture can be decoded. */
+	ret = decoder_get_load(core_str_ctx->dd_str_ctx->dec_ctx, &global_avail_slots);
+	if (ret != IMG_SUCCESS) {
+		pr_err("No resources avaialable to decode this picture");
+		ret = IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE;
+		goto unwind;
+	}
+
+	/*
+	 * Load and availability is cached in stream context simply
+	 * for status reporting.
+	 */
+	avail = core_get_resource_availability(core_str_ctx);
+
+	if ((avail & CORE_AVAIL_CORE) == 0) {
+		/* Return straight away if the core is not available */
+		ret = IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE;
+		goto unwind;
+	}
+
+	if (core_str_ctx->new_op_cfg || core_str_ctx->new_seq) {
+		/*
+		 * Reconstructed buffers should be checked for reconfiguration
+		 * under these conditions:
+		 *     1. New output configuration,
+		 *     2. New sequence.
+		 * Core can decide to reset the reconstructed buffer properties
+		 * if there are no previous reference pictures used
+		 * (i.e. at a closed GOP). This code must go here because we
+		 * may not stop when new sequence is found or references become
+		 * unused.
+		 */
+		ret = core_reconfigure_recon_pictbufs(core_str_ctx,
+						      core_str_ctx->no_prev_refs_used);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			goto unwind;
+	}
+
+	/* Update the display information for this picture. */
+	ret = vdecddutils_get_display_region(&str_unit->pict_hdr_info->coded_frame_size,
+					     &str_unit->pict_hdr_info->disp_info.enc_disp_region,
+					     &str_unit->pict_hdr_info->disp_info.disp_region);
+
+	if (ret != IMG_SUCCESS)
+		goto unwind;
+
+	/* Clear internal state */
+	core_str_ctx->new_seq = FALSE;
+	core_str_ctx->new_op_cfg = FALSE;
+	core_str_ctx->no_prev_refs_used = FALSE;
+
+	/*
+	 * Recalculate this since we might have just created
+	 * internal resources.
+	 */
+	core_str_ctx->res_avail = core_get_resource_availability(core_str_ctx);
+
+	/*
+	 * If picture resources were needed for this stream, picture resources
+	 * list wouldn't be empty
+	 */
+	need_pict_res = !lst_empty(&core_str_ctx->aux_pict_res_list);
+	/* If there are resources available */
+	if ((core_str_ctx->res_avail & CORE_AVAIL_PICTBUF) &&
+	    (!need_pict_res || (core_str_ctx->res_avail & CORE_AVAIL_PICTRES))) {
+		/* Pick internal picture resources. */
+		if (need_pict_res) {
+			pict_local->pict_res_int =
+				resource_list_get_avail(&core_str_ctx->aux_pict_res_list);
+
+			VDEC_ASSERT(pict_local->pict_res_int);
+			if (!pict_local->pict_res_int) {
+				ret = IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE;
+				goto unwind;
+			}
+		}
+
+		/* Pick the client image buffer. */
+		pict_local->disp_pict_buf.pict_buf =
+			resource_list_get_avail(&core_str_ctx->pict_buf_list);
+		VDEC_ASSERT(pict_local->disp_pict_buf.pict_buf);
+		if (!pict_local->disp_pict_buf.pict_buf) {
+			ret = IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE;
+			goto unwind;
+		}
+	} else {
+		/* Need resources to process picture start. */
+		ret = IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE;
+		goto unwind;
+	}
+
+	/* Ensure that the buffer contains layout information. */
+	pict_local->disp_pict_buf.rend_info = core_str_ctx->disp_pict_buf.rend_info;
+	pict_local->disp_pict_buf.buf_config = core_str_ctx->disp_pict_buf.buf_config;
+	pict_local->op_config = core_str_ctx->op_cfg;
+	pict_local->last_pict_in_seq = str_unit->last_pict_in_seq;
+
+	str_unit->dd_pict_data = pict_local;
+
+	/* Indicate that all necessary resources are now available. */
+	if (core_str_ctx->res_avail != ~0) {
+#ifdef DEBUG_DECODER_DRIVER
+		pr_info("LAST AVAIL: 0x%08X\n", core_str_ctx->res_avail);
+#endif
+		core_str_ctx->res_avail = ~0;
+	}
+
+#ifdef DEBUG_DECODER_DRIVER
+	/* dump decoder internal resource addresses */
+	if (pict_local->pict_res_int) {
+		if (pict_local->pict_res_int->mb_param_buf) {
+			pr_info("[USERSID=0x%08X] MB parameter buffer device virtual address: 0x%08X",
+				core_str_ctx->dd_str_ctx->str_config_data.user_str_id,
+				pict_local->pict_res_int->mb_param_buf->ddbuf_info.dev_virt);
+		}
+
+		if (core_str_ctx->comseq_hdr_info.separate_chroma_planes) {
+			pr_info("[USERSID=0x%08X] Display picture virtual address: LUMA 0x%08X, CHROMA 0x%08X, CHROMA2 0x%08X",
+				core_str_ctx->dd_str_ctx->str_config_data.user_str_id,
+				pict_local->disp_pict_buf.pict_buf->ddbuf_info.dev_virt,
+				pict_local->disp_pict_buf.pict_buf->ddbuf_info.dev_virt +
+				pict_local->disp_pict_buf.rend_info.plane_info
+						[VDEC_PLANE_VIDEO_U].offset,
+				pict_local->disp_pict_buf.pict_buf->ddbuf_info.dev_virt +
+				pict_local->disp_pict_buf.rend_info.plane_info
+						[VDEC_PLANE_VIDEO_V].offset);
+		} else {
+			pr_info("[USERSID=0x%08X] Display picture virtual address: LUMA 0x%08X, CHROMA 0x%08X",
+				core_str_ctx->dd_str_ctx->str_config_data.user_str_id,
+				pict_local->disp_pict_buf.pict_buf->ddbuf_info.dev_virt,
+				pict_local->disp_pict_buf.pict_buf->ddbuf_info.dev_virt +
+				pict_local->disp_pict_buf.rend_info.plane_info
+						[VDEC_PLANE_VIDEO_UV].offset);
+		}
+	}
+#endif
+
+	ret = core_picture_attach_resources(core_str_ctx, str_unit, TRUE);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto unwind;
+
+	return IMG_SUCCESS;
+
+unwind:
+	if (pict_local->pict_res_int) {
+		resource_item_return(&pict_local->pict_res_int->ref_cnt);
+		pict_local->pict_res_int = NULL;
+	}
+	if (pict_local->disp_pict_buf.pict_buf) {
+		resource_item_return(&pict_local->disp_pict_buf.pict_buf->ddbuf_info.ref_count);
+		pict_local->disp_pict_buf.pict_buf = NULL;
+	}
+	kfree(pict_local);
+	return ret;
+}
+
+/*
+ * @Function              core_validate_new_sequence
+ */
+static int core_validate_new_sequence(struct core_stream_context *core_str_ctx,
+				      const struct vdec_comsequ_hdrinfo *comseq_hdrinfo)
+{
+	int ret;
+	struct vdecdd_supp_check supp_check;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	unsigned int num_req_bufs_prev, num_req_bufs_cur;
+	struct vdecdd_mapbuf_info mapbuf_info;
+
+	memset(&supp_check, 0, sizeof(supp_check));
+
+	/*
+	 * Omit picture header from this setup since we can'supp_check
+	 * validate this here.
+	 */
+	supp_check.comseq_hdrinfo = comseq_hdrinfo;
+
+	if (core_str_ctx->opcfg_set) {
+		supp_check.op_cfg = &core_str_ctx->op_cfg;
+		supp_check.disp_pictbuf = &core_str_ctx->disp_pict_buf;
+
+		ret = vdecddutils_get_minrequired_numpicts
+			(&core_str_ctx->dd_str_ctx->str_config_data,
+			 &core_str_ctx->comseq_hdr_info,
+			 &core_str_ctx->op_cfg,
+			 &num_req_bufs_prev);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			return ret;
+
+		ret = vdecddutils_get_minrequired_numpicts
+			(&core_str_ctx->dd_str_ctx->str_config_data,
+			 comseq_hdrinfo,
+			 &core_str_ctx->op_cfg,
+			 &num_req_bufs_cur);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			return ret;
+	}
+
+	/* Check if the output configuration is compatible with new VSH. */
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+	mapbuf_info = dd_str_ctx->map_buf_info;
+
+	/* Check the compatibility of the bitstream data and configuration */
+	supp_check.non_cfg_req = TRUE;
+	ret = core_check_decoder_support(dd_str_ctx->dd_dev_context,
+					 &dd_str_ctx->str_config_data,
+					 &dd_str_ctx->prev_comseq_hdr_info,
+					 &dd_str_ctx->prev_pict_hdr_info,
+					 &mapbuf_info, &supp_check);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	core_str_ctx->new_seq = TRUE;
+
+	return IMG_SUCCESS;
+}
+
+static int
+core_validate_new_picture(struct core_stream_context *core_str_ctx,
+			  const struct bspp_pict_hdr_info *pict_hdrinfo,
+			  unsigned int *features)
+{
+	int ret;
+	struct vdecdd_supp_check supp_check;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct vdecdd_mapbuf_info mapbuf_info;
+
+	memset(&supp_check, 0, sizeof(supp_check));
+	supp_check.comseq_hdrinfo = &core_str_ctx->comseq_hdr_info;
+	supp_check.pict_hdrinfo = pict_hdrinfo;
+
+	/*
+	 * They cannot become invalid during a sequence.
+	 * However, output configuration may signal something that
+	 * changes compatibility on a closed GOP within a sequence
+	 * (e.g. resolution may significantly decrease
+	 * in a GOP and scaling wouldn't be supported). This resolution shift
+	 * would not be signalled in the sequence header
+	 * (since that is the maximum) but only
+	 * found now when validating the first picture in the GOP.
+	 */
+	if (core_str_ctx->opcfg_set)
+		supp_check.op_cfg = &core_str_ctx->op_cfg;
+
+	/*
+	 * Check if the new picture is compatible with the
+	 * current driver state.
+	 */
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+	mapbuf_info = dd_str_ctx->map_buf_info;
+
+	/* Check the compatibility of the bitstream data and configuration */
+	supp_check.non_cfg_req = TRUE;
+	ret = core_check_decoder_support(dd_str_ctx->dd_dev_context,
+					 &dd_str_ctx->str_config_data,
+					 &dd_str_ctx->prev_comseq_hdr_info,
+					 &dd_str_ctx->prev_pict_hdr_info,
+					 &mapbuf_info, &supp_check);
+
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	if (supp_check.unsupp_flags.str_opcfg || supp_check.unsupp_flags.pict_hdr)
+		return IMG_ERROR_NOT_SUPPORTED;
+
+	/*
+	 * Clear the reconfiguration flags unless triggered by
+	 * unsupported output config.
+	 */
+	*features = supp_check.features;
+
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function core_stream_submit_unit
+ */
+int core_stream_submit_unit(unsigned int res_str_id, struct vdecdd_str_unit *str_unit)
+{
+	int ret;
+	unsigned char process_str_unit = TRUE;
+
+	struct vdecdd_ddstr_ctx *dd_str_context;
+	struct core_stream_context *core_str_ctx;
+
+	/*
+	 * Stream based messages without a device context
+	 * must have a stream ID.
+	 */
+	VDEC_ASSERT(res_str_id);
+	VDEC_ASSERT(str_unit);
+
+	if (res_str_id == 0 || !str_unit) {
+		pr_err("Invalid params passed to %s\n", __func__);
+		return IMG_ERROR_INVALID_PARAMETERS;
+	}
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID, (void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	VDEC_ASSERT(core_str_ctx);
+	dd_str_context = core_str_ctx->dd_str_ctx;
+	VDEC_ASSERT(dd_str_context);
+
+	ret = resource_list_add_img(&core_str_ctx->str_unit_list, str_unit, 0, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+
+	pr_debug("%s stream unit type = %d\n", __func__, str_unit->str_unit_type);
+	switch (str_unit->str_unit_type) {
+	case VDECDD_STRUNIT_SEQUENCE_START:
+		if (str_unit->seq_hdr_info) {
+			/* Add sequence header to cache. */
+			ret =
+				resource_list_replace(&core_str_ctx->seq_hdr_list,
+						      str_unit->seq_hdr_info,
+						      str_unit->seq_hdr_info->sequ_hdr_id,
+						      &str_unit->seq_hdr_info->ref_count,
+						      NULL, NULL);
+
+			if (ret != IMG_SUCCESS)
+				pr_err("[USERSID=0x%08X] Failed to replace resource",
+				       res_str_id);
+		} else {
+			/* ...or take from cache. */
+			str_unit->seq_hdr_info =
+				resource_list_getbyid(&core_str_ctx->seq_hdr_list,
+						      str_unit->seq_hdr_id);
+		}
+
+		VDEC_ASSERT(str_unit->seq_hdr_info);
+		if (!str_unit->seq_hdr_info) {
+			pr_err("Sequence header information not available for current picture");
+			break;
+		}
+		/*
+		 * Check that this latest sequence header information is
+		 * compatible with current state and then if no errors store
+		 * as current.
+		 */
+		core_str_ctx->comseq_hdr_info = str_unit->seq_hdr_info->com_sequ_hdr_info;
+
+		ret = core_validate_new_sequence(core_str_ctx,
+						 &str_unit->seq_hdr_info->com_sequ_hdr_info);
+		if (ret != IMG_SUCCESS)
+			return ret;
+
+		dd_str_context->prev_comseq_hdr_info =
+			dd_str_context->comseq_hdr_info;
+		dd_str_context->comseq_hdr_info =
+			str_unit->seq_hdr_info->com_sequ_hdr_info;
+
+#ifdef DEBUG_DECODER_DRIVER
+		pr_info("[SID=0x%08X] VSH: Maximum Frame Resolution [%dx%d]",
+			dd_str_context->res_str_id,
+			dd_str_context->comseq_hdr_info.max_frame_size.width,
+			dd_str_context->comseq_hdr_info.max_frame_size.height);
+#endif
+
+		break;
+
+	case VDECDD_STRUNIT_PICTURE_START:
+		/*
+		 * Check that the picture configuration is compatible
+		 * with the current state.
+		 */
+		ret = core_validate_new_picture(core_str_ctx,
+						str_unit->pict_hdr_info,
+						&str_unit->features);
+		if (ret != IMG_SUCCESS) {
+			if (ret == IMG_ERROR_NOT_SUPPORTED) {
+				/*
+				 * Do not process stream unit since there is
+				 * something unsupported.
+				 */
+				process_str_unit = FALSE;
+				break;
+			}
+		}
+
+		/* Prepare picture for decoding. */
+		ret = core_picture_prepare(core_str_ctx, str_unit);
+		if (ret != IMG_SUCCESS)
+			if (ret == IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE ||
+			    ret == IMG_ERROR_NOT_SUPPORTED)
+				/*
+				 * Do not process stream unit since there is
+				 * something unsupported or resources are not
+				 * available.
+				 */
+				process_str_unit = FALSE;
+		break;
+
+	default:
+		/*
+		 * Sequence/picture headers should only be attached to
+		 * corresponding units.
+		 */
+		VDEC_ASSERT(!str_unit->seq_hdr_info);
+		VDEC_ASSERT(!str_unit->pict_hdr_info);
+		break;
+	}
+
+	if (process_str_unit) {
+		/* Submit stream unit to the decoder for processing. */
+		str_unit->decode = TRUE;
+		ret = decoder_stream_process_unit(dd_str_context->dec_ctx,
+						  str_unit);
+	} else {
+		ret = IMG_ERROR_GENERIC_FAILURE;
+	}
+
+	return ret;
+}
+
+/*
+ * @Function  core_stream_fill_pictbuf
+ */
+int core_stream_fill_pictbuf(unsigned int buf_map_id)
+{
+	int ret;
+	struct vdecdd_ddbuf_mapinfo *ddbuf_map_info;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct core_stream_context *core_str_ctx;
+
+	/* Get access to map info context.. */
+	ret = rman_get_resource(buf_map_id, VDECDD_BUFMAP_TYPE_ID,
+				(void **)&ddbuf_map_info, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = ddbuf_map_info->ddstr_context;
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(dd_str_ctx->res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	/* Check buffer type. */
+	VDEC_ASSERT(ddbuf_map_info->buf_type == VDEC_BUFTYPE_PICTURE);
+
+	/* Add the image buffer to the list */
+	ret = resource_list_add_img(&core_str_ctx->pict_buf_list, ddbuf_map_info,
+				    0, &ddbuf_map_info->ddbuf_info.ref_count);
+
+	return ret;
+}
+
+/*
+ * @Function              core_fn_free_mapped
+ */
+static void core_fn_free_mapped(void *param)
+{
+	struct vdecdd_ddbuf_mapinfo *ddbuf_map_info =
+		(struct vdecdd_ddbuf_mapinfo *)param;
+
+	/* Validate input arguments */
+	VDEC_ASSERT(param);
+
+	/* Do not free the MMU mapping. It is handled by talmmu code. */
+	kfree(ddbuf_map_info);
+}
+
+/*
+ * @Function              core_stream_map_buf
+ */
+int core_stream_map_buf(unsigned int res_str_id, enum vdec_buf_type buf_type,
+			struct vdec_buf_info *buf_info, unsigned int *buf_map_id)
+{
+	int ret;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct core_stream_context *core_str_ctx;
+	struct vdecdd_ddbuf_mapinfo *ddbuf_map_info;
+
+	/*
+	 * Stream based messages without a device context
+	 * must have a stream ID.
+	 */
+	VDEC_ASSERT(res_str_id);
+	VDEC_ASSERT(buf_type < VDEC_BUFTYPE_MAX);
+	VDEC_ASSERT(buf_info);
+	VDEC_ASSERT(buf_map_id);
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_ctx);
+
+	/* Allocate an active stream unit.. */
+	ddbuf_map_info = kzalloc(sizeof(*ddbuf_map_info), GFP_KERNEL);
+	VDEC_ASSERT(ddbuf_map_info);
+
+	if (!ddbuf_map_info) {
+		pr_err("[SID=0x%08X] Failed to allocate memory for DD buffer map information",
+		       dd_str_ctx->res_str_id);
+
+		return IMG_ERROR_OUT_OF_MEMORY;
+	}
+	memset(ddbuf_map_info, 0, sizeof(*ddbuf_map_info));
+
+	/* Save the stream context etc. */
+	ddbuf_map_info->ddstr_context   = dd_str_ctx;
+	ddbuf_map_info->buf_type        = buf_type;
+
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("%s:%d vdec2plus: vxd map buff id %d", __func__, __LINE__,
+		buf_info->buf_id);
+#endif
+	ddbuf_map_info->buf_id = buf_info->buf_id;
+
+	/* Register the allocation as a stream resource.. */
+	ret = rman_register_resource(dd_str_ctx->res_buck_handle,
+				     VDECDD_BUFMAP_TYPE_ID,
+				     core_fn_free_mapped,
+				     ddbuf_map_info,
+				     &ddbuf_map_info->res_handle,
+				     buf_map_id);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	ddbuf_map_info->buf_map_id = *buf_map_id;
+
+	if (buf_type == VDEC_BUFTYPE_PICTURE) {
+		if (dd_str_ctx->map_buf_info.num_buf == 0) {
+			dd_str_ctx->map_buf_info.buf_size = buf_info->buf_size;
+			dd_str_ctx->map_buf_info.byte_interleave =
+				buf_info->pictbuf_cfg.byte_interleave;
+#ifdef DEBUG_DECODER_DRIVER
+			pr_info("[SID=0x%08X] Mapped Buffer size: %d (bytes)",
+				dd_str_ctx->res_str_id, buf_info->buf_size);
+#endif
+		} else {
+			/*
+			 * Same byte interleaved setting should be used.
+			 * Convert to actual bools by comparing with zero.
+			 */
+			if (buf_info->pictbuf_cfg.byte_interleave !=
+				dd_str_ctx->map_buf_info.byte_interleave) {
+				pr_err("[SID=0x%08X] Buffer cannot be mapped since its byte interleave value (%s) is not the same as buffers already mapped (%s)",
+				       dd_str_ctx->res_str_id,
+				       buf_info->pictbuf_cfg.byte_interleave ?
+				       "ON" : "OFF",
+				       dd_str_ctx->map_buf_info.byte_interleave ?
+				       "ON" : "OFF");
+				ret = IMG_ERROR_INVALID_PARAMETERS;
+				goto error;
+			}
+		}
+
+		/* Configure the buffer.. */
+		ret = core_stream_set_pictbuf_config(dd_str_ctx, &buf_info->pictbuf_cfg);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			goto error;
+	}
+
+	/* Map heap from VDEC to MMU. */
+	switch (buf_type) {
+	case VDEC_BUFTYPE_BITSTREAM:
+		ddbuf_map_info->mmuheap_id = MMU_HEAP_BITSTREAM_BUFFERS;
+		break;
+
+	case VDEC_BUFTYPE_PICTURE:
+		mmu_get_heap(buf_info->pictbuf_cfg.stride[VDEC_PLANE_VIDEO_Y],
+			     &ddbuf_map_info->mmuheap_id);
+		break;
+
+	default:
+		VDEC_ASSERT(FALSE);
+	}
+
+	/* Map this buffer into the MMU. */
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("----- %s:%d calling MMU_StreamMapExt", __func__, __LINE__);
+#endif
+	ret = mmu_stream_map_ext(dd_str_ctx->mmu_str_handle,
+				 (enum mmu_eheap_id)ddbuf_map_info->mmuheap_id,
+				 ddbuf_map_info->buf_id,
+				 buf_info->buf_size, DEV_MMU_PAGE_SIZE,
+				 buf_info->mem_attrib,
+				 buf_info->cpu_linear_addr,
+				 &ddbuf_map_info->ddbuf_info);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	if (buf_type == VDEC_BUFTYPE_PICTURE)
+		dd_str_ctx->map_buf_info.num_buf++;
+
+	/*
+	 * Initialise the reference count to indicate that the client
+	 * still holds the buffer.
+	 */
+	ddbuf_map_info->ddbuf_info.ref_count = 1;
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+
+error:
+	if (ddbuf_map_info) {
+		if (ddbuf_map_info->res_handle)
+			rman_free_resource(ddbuf_map_info->res_handle);
+		else
+			kfree(ddbuf_map_info);
+	}
+
+	return ret;
+}
+
+/*
+ * @Function              core_stream_map_buf_sg
+ */
+int core_stream_map_buf_sg(unsigned int res_str_id, enum vdec_buf_type buf_type,
+			   struct vdec_buf_info *buf_info,
+			   void *sgt, unsigned int *buf_map_id)
+{
+	int ret;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct core_stream_context *core_str_ctx;
+	struct vdecdd_ddbuf_mapinfo *ddbuf_map_info;
+
+	/*
+	 * Resource stream ID cannot be zero. If zero just warning and
+	 * proceeding further will break the code. Return IMG_ERROR_INVALID_ID.
+	 */
+	if (res_str_id <= 0)
+		return IMG_ERROR_INVALID_ID;
+
+	VDEC_ASSERT(buf_type < VDEC_BUFTYPE_MAX);
+	VDEC_ASSERT(buf_info);
+	VDEC_ASSERT(buf_map_id);
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID, (void **)&core_str_ctx, NULL);
+
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_ctx);
+
+	/* Allocate an active stream unit.. */
+	ddbuf_map_info = kzalloc(sizeof(*ddbuf_map_info), GFP_KERNEL);
+	VDEC_ASSERT(ddbuf_map_info);
+
+	if (!ddbuf_map_info) {
+		pr_err("[SID=0x%08X] Failed to allocate memory for DD buffer map information",
+		       dd_str_ctx->res_str_id);
+
+		return IMG_ERROR_OUT_OF_MEMORY;
+	}
+
+	/* Save the stream context etc. */
+	ddbuf_map_info->ddstr_context = dd_str_ctx;
+	ddbuf_map_info->buf_type = buf_type;
+
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("%s:%d vdec2plus: vxd map buff id %d", __func__, __LINE__,
+		buf_info->buf_id);
+#endif
+	ddbuf_map_info->buf_id = buf_info->buf_id;
+
+	/* Register the allocation as a stream resource.. */
+	ret = rman_register_resource(dd_str_ctx->res_buck_handle,
+				     VDECDD_BUFMAP_TYPE_ID,
+				     core_fn_free_mapped, ddbuf_map_info,
+				     &ddbuf_map_info->res_handle, buf_map_id);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	ddbuf_map_info->buf_map_id = *buf_map_id;
+
+	if (buf_type == VDEC_BUFTYPE_PICTURE) {
+		if (dd_str_ctx->map_buf_info.num_buf == 0) {
+			dd_str_ctx->map_buf_info.buf_size = buf_info->buf_size;
+
+			dd_str_ctx->map_buf_info.byte_interleave =
+				buf_info->pictbuf_cfg.byte_interleave;
+
+#ifdef DEBUG_DECODER_DRIVER
+			pr_info("[SID=0x%08X] Mapped Buffer size: %d (bytes)",
+				dd_str_ctx->res_str_id, buf_info->buf_size);
+#endif
+		} else {
+			/*
+			 * Same byte interleaved setting should be used.
+			 * Convert to actual bools by comparing with zero.
+			 */
+			if (buf_info->pictbuf_cfg.byte_interleave !=
+				dd_str_ctx->map_buf_info.byte_interleave) {
+				pr_err("[SID=0x%08X] Buffer cannot be mapped since its byte interleave value (%s) is not the same as buffers already mapped (%s)",
+				       dd_str_ctx->res_str_id,
+				       buf_info->pictbuf_cfg.byte_interleave ?
+				       "ON" : "OFF",
+				       dd_str_ctx->map_buf_info.byte_interleave ?
+				       "ON" : "OFF");
+				ret = IMG_ERROR_INVALID_PARAMETERS;
+				goto error;
+			}
+		}
+
+		/* Configure the buffer.. */
+		ret = core_stream_set_pictbuf_config(dd_str_ctx, &buf_info->pictbuf_cfg);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			goto error;
+	}
+
+	/* Map heap from VDEC to MMU. */
+	switch (buf_type) {
+	case VDEC_BUFTYPE_BITSTREAM:
+		ddbuf_map_info->mmuheap_id = MMU_HEAP_BITSTREAM_BUFFERS;
+		break;
+
+	case VDEC_BUFTYPE_PICTURE:
+		mmu_get_heap(buf_info->pictbuf_cfg.stride[VDEC_PLANE_VIDEO_Y],
+			     &ddbuf_map_info->mmuheap_id);
+		break;
+
+	default:
+		VDEC_ASSERT(FALSE);
+	}
+
+	/* Map this buffer into the MMU. */
+#ifdef	DEBUG_DECODER_DRIVER
+	pr_info("----- %s:%d calling MMU_StreamMapExt_sg", __func__, __LINE__);
+#endif
+	ret =
+		mmu_stream_map_ext_sg(dd_str_ctx->mmu_str_handle,
+				      (enum mmu_eheap_id)ddbuf_map_info->mmuheap_id,
+				      sgt, buf_info->buf_size, DEV_MMU_PAGE_SIZE,
+				      buf_info->mem_attrib, buf_info->cpu_linear_addr,
+				      &ddbuf_map_info->ddbuf_info,
+				      &ddbuf_map_info->buf_id);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		goto error;
+
+	if (buf_type == VDEC_BUFTYPE_PICTURE)
+		dd_str_ctx->map_buf_info.num_buf++;
+
+	/*
+	 * Initialise the reference count to indicate that the client
+	 * still holds the buffer.
+	 */
+	ddbuf_map_info->ddbuf_info.ref_count = 1;
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+
+error:
+	if (ddbuf_map_info->res_handle)
+		rman_free_resource(ddbuf_map_info->res_handle);
+	else
+		kfree(ddbuf_map_info);
+
+	return ret;
+}
+
+/*
+ * @Function  core_stream_unmap_buf
+ */
+int core_stream_unmap_buf(unsigned int buf_map_id)
+{
+	int ret;
+	struct vdecdd_ddbuf_mapinfo *ddbuf_map_info;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct core_stream_context *core_str_ctx;
+
+	/* Get access to map info context.. */
+	ret = rman_get_resource(buf_map_id, VDECDD_BUFMAP_TYPE_ID,
+				(void **)&ddbuf_map_info, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = ddbuf_map_info->ddstr_context;
+	VDEC_ASSERT(dd_str_ctx);
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(dd_str_ctx->res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(core_str_ctx);
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("UNMAP: PM [0x%p] --> VM [0x%08X - 0x%08X] (%d bytes)",
+		ddbuf_map_info->ddbuf_info.cpu_virt,
+		ddbuf_map_info->ddbuf_info.dev_virt,
+		ddbuf_map_info->ddbuf_info.dev_virt +
+		ddbuf_map_info->ddbuf_info.buf_size,
+		ddbuf_map_info->ddbuf_info.buf_size);
+#endif
+
+	/* Buffer should only be held by the client. */
+	VDEC_ASSERT(ddbuf_map_info->ddbuf_info.ref_count == 1);
+	if (ddbuf_map_info->ddbuf_info.ref_count != 1)
+		return IMG_ERROR_MEMORY_IN_USE;
+
+	ddbuf_map_info->ddbuf_info.ref_count = 0;
+	if (ddbuf_map_info->buf_type == VDEC_BUFTYPE_PICTURE) {
+		/* Remove this picture buffer from pictbuf list */
+		ret = resource_list_remove(&core_str_ctx->pict_buf_list, ddbuf_map_info);
+
+		VDEC_ASSERT(ret == IMG_SUCCESS || ret == IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE);
+		if (ret != IMG_SUCCESS && ret != IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE)
+			return ret;
+
+		ddbuf_map_info->ddstr_context->map_buf_info.num_buf--;
+
+		/* Clear some state if there are no more mapped buffers. */
+		if (dd_str_ctx->map_buf_info.num_buf == 0) {
+			dd_str_ctx->map_buf_info.buf_size = 0;
+			dd_str_ctx->map_buf_info.byte_interleave = FALSE;
+		}
+	}
+
+	/* Unmap this buffer from the MMU. */
+	ret = mmu_free_mem(dd_str_ctx->mmu_str_handle, &ddbuf_map_info->ddbuf_info);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	/* Free buffer map info. */
+	rman_free_resource(ddbuf_map_info->res_handle);
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function              core_stream_unmap_buf_sg
+ */
+int core_stream_unmap_buf_sg(unsigned int buf_map_id)
+{
+	int ret;
+	struct vdecdd_ddbuf_mapinfo *ddbuf_map_info;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct core_stream_context *core_str_ctx;
+
+	/* Get access to map info context.. */
+	ret = rman_get_resource(buf_map_id, VDECDD_BUFMAP_TYPE_ID, (void **)&ddbuf_map_info, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = ddbuf_map_info->ddstr_context;
+	VDEC_ASSERT(dd_str_ctx);
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(dd_str_ctx->res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(core_str_ctx);
+
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("UNMAP: PM [0x%p] --> VM [0x%08X - 0x%08X] (%d bytes)",
+		ddbuf_map_info->ddbuf_info.cpu_virt,
+		ddbuf_map_info->ddbuf_info.dev_virt,
+		ddbuf_map_info->ddbuf_info.dev_virt +
+		ddbuf_map_info->ddbuf_info.buf_size,
+		ddbuf_map_info->ddbuf_info.buf_size);
+#endif
+
+	/* Buffer should only be held by the client. */
+	VDEC_ASSERT(ddbuf_map_info->ddbuf_info.ref_count == 1);
+	if (ddbuf_map_info->ddbuf_info.ref_count != 1)
+		return IMG_ERROR_MEMORY_IN_USE;
+
+	ddbuf_map_info->ddbuf_info.ref_count = 0;
+
+	if (ddbuf_map_info->buf_type == VDEC_BUFTYPE_PICTURE) {
+		/* Remove this picture buffer from pictbuf list */
+		ret = resource_list_remove(&core_str_ctx->pict_buf_list, ddbuf_map_info);
+
+		VDEC_ASSERT(ret == IMG_SUCCESS || ret == IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE);
+		if (ret != IMG_SUCCESS && ret != IMG_ERROR_COULD_NOT_OBTAIN_RESOURCE)
+			return ret;
+
+		ddbuf_map_info->ddstr_context->map_buf_info.num_buf--;
+
+		/*
+		 * Clear some state if there are no more
+		 * mapped buffers.
+		 */
+		if (dd_str_ctx->map_buf_info.num_buf == 0) {
+			dd_str_ctx->map_buf_info.buf_size = 0;
+			dd_str_ctx->map_buf_info.byte_interleave = FALSE;
+		}
+	}
+
+	/* Unmap this buffer from the MMU. */
+	ret = mmu_free_mem_sg(dd_str_ctx->mmu_str_handle, &ddbuf_map_info->ddbuf_info);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	/* Free buffer map info. */
+	rman_free_resource(ddbuf_map_info->res_handle);
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function              core_stream_flush
+ */
+int core_stream_flush(unsigned int res_str_id, unsigned char discard_refs)
+{
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+	struct core_stream_context *core_str_ctx;
+	int ret;
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID,
+				(void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_ctx);
+	VDEC_ASSERT(dd_str_ctx->dd_str_state == VDECDD_STRSTATE_STOPPED);
+
+	/*
+	 * If unsupported sequence is found, we need to do additional
+	 * check for DPB flush condition
+	 */
+	if (!dd_str_ctx->comseq_hdr_info.not_dpb_flush) {
+		ret = decoder_stream_flush(dd_str_ctx->dec_ctx, discard_refs);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			return ret;
+	}
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function              core_stream_release_bufs
+ */
+int core_stream_release_bufs(unsigned int res_str_id, enum vdec_buf_type buf_type)
+{
+	int ret;
+	struct core_stream_context *core_str_ctx;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID, (void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_ctx);
+	VDEC_ASSERT(buf_type < VDEC_BUFTYPE_MAX);
+
+	switch (buf_type) {
+	case VDEC_BUFTYPE_PICTURE:
+	{
+		/* Empty all the decoded picture related buffer lists. */
+		ret = resource_list_empty(&core_str_ctx->pict_buf_list, TRUE, NULL, NULL);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		break;
+	}
+
+	case VDEC_BUFTYPE_BITSTREAM:
+	{
+		/* Empty the stream unit queue. */
+		ret = resource_list_empty(&core_str_ctx->str_unit_list, FALSE,
+					  (resource_pfn_freeitem)core_fn_free_stream_unit,
+					   core_str_ctx);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		break;
+	}
+
+	case VDEC_BUFTYPE_ALL:
+	{
+		/* Empty all the decoded picture related buffer lists. */
+		ret = resource_list_empty(&core_str_ctx->pict_buf_list, TRUE, NULL, NULL);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+
+		/* Empty the stream unit queue. */
+		ret = resource_list_empty(&core_str_ctx->str_unit_list, FALSE,
+					  (resource_pfn_freeitem)core_fn_free_stream_unit,
+					   core_str_ctx);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		break;
+	}
+
+	default:
+	{
+		ret = IMG_ERROR_INVALID_PARAMETERS;
+		VDEC_ASSERT(FALSE);
+		break;
+	}
+	}
+
+	if (buf_type == VDEC_BUFTYPE_PICTURE || buf_type == VDEC_BUFTYPE_ALL) {
+		ret = decoder_stream_release_buffers(dd_str_ctx->dec_ctx);
+		VDEC_ASSERT(ret == IMG_SUCCESS);
+		if (ret != IMG_SUCCESS)
+			return ret;
+	}
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function              core_stream_get_status
+ */
+int core_stream_get_status(unsigned int res_str_id,
+			   struct vdecdd_decstr_status *str_st)
+{
+	int ret;
+	struct core_stream_context *core_str_ctx;
+	struct vdecdd_ddstr_ctx *dd_str_ctx;
+
+	/* Get access to stream context.. */
+	ret = rman_get_resource(res_str_id, VDECDD_STREAM_TYPE_ID, (void **)&core_str_ctx, NULL);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	dd_str_ctx = core_str_ctx->dd_str_ctx;
+
+	VDEC_ASSERT(dd_str_ctx);
+	VDEC_ASSERT(str_st);
+
+	ret = decoder_stream_get_status(dd_str_ctx->dec_ctx, str_st);
+	VDEC_ASSERT(ret == IMG_SUCCESS);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	/* Return success.. */
+	return IMG_SUCCESS;
+}
+
+#ifdef HAS_HEVC
+/*
+ * @Function              core_free_hevc_picture_resource
+ */
+static int core_free_hevc_picture_resource(struct core_stream_context *core_strctx,
+					   struct vdecdd_pict_resint *pic_res_int)
+{
+	int ret = IMG_SUCCESS;
+
+	ret = core_free_resbuf(&pic_res_int->genc_fragment_buf,
+			       core_strctx->dd_str_ctx->mmu_str_handle);
+	if (ret != IMG_SUCCESS)
+		pr_err("MMU_Free for Genc Fragment buffer failed with error %u", ret);
+
+	return ret;
+}
+
+/*
+ * @Function              core_free_hevc_sequence_resource
+ */
+static int core_free_hevc_sequence_resource(struct core_stream_context *core_strctx,
+					    struct vdecdd_seq_resint *seq_res_int)
+{
+	unsigned int i;
+	int local_result = IMG_SUCCESS;
+	int ret = IMG_SUCCESS;
+
+	for (i = 0; i < GENC_BUFF_COUNT; ++i) {
+		local_result = core_free_resbuf(&seq_res_int->genc_buffers[i],
+						core_strctx->dd_str_ctx->mmu_str_handle);
+		if (local_result != IMG_SUCCESS) {
+			ret = local_result;
+			pr_warn("MMU_Free for GENC buffer %u failed with error %u", i,
+				local_result);
+		}
+	}
+
+	local_result = core_free_resbuf(&seq_res_int->intra_buffer,
+					core_strctx->dd_str_ctx->mmu_str_handle);
+	if (local_result != IMG_SUCCESS) {
+		ret = local_result;
+		pr_warn("MMU_Free for GENC buffer %u failed with error %u", i, local_result);
+	}
+
+	local_result = core_free_resbuf(&seq_res_int->aux_buffer,
+					core_strctx->dd_str_ctx->mmu_str_handle);
+	if (local_result != IMG_SUCCESS) {
+		ret = local_result;
+		pr_warn("MMU_Free for GENC buffer %u failed with error %u", i, local_result);
+	}
+
+	return ret;
+}
+
+/*
+ * @Function              core_hevc_bufs_get_size
+ */
+static int core_hevc_bufs_get_size(struct core_stream_context *core_strctx,
+				   const struct vdec_comsequ_hdrinfo *seqhdr_info,
+				   struct vdec_pict_size *max_pict_size,
+				   struct core_pict_bufsize_info *size_info,
+				   struct core_seq_resinfo *seqres_info,
+				   unsigned char *resource_needed)
+{
+	enum vdec_vid_std vid_std = core_strctx->dd_str_ctx->str_config_data.vid_std;
+	unsigned int std_idx = vid_std - 1;
+
+	static const unsigned short max_slice_segments_list
+		[HEVC_LEVEL_MAJOR_NUM][HEVC_LEVEL_MINOR_NUM] = {
+		/* level: 1.0  1.1  1.2  */
+		{ 16,    0,   0, },
+		/* level: 2.0  2.1  2.2  */
+		{ 16,   20,   0, },
+		/* level: 3.0  3.1  3.2  */
+		{ 30,   40,   0, },
+		/* level: 4.0  4.1  4.2  */
+		{ 75,   75,   0, },
+		/* level: 5.0  5.1  5.2  */
+		{ 200, 200, 200, },
+		/* level: 6.0  6.1  6.2  */
+		{ 600, 600, 600, }
+	};
+
+	static const unsigned char max_tile_cols_list
+		[HEVC_LEVEL_MAJOR_NUM][HEVC_LEVEL_MINOR_NUM] = {
+		/* level: 1.0  1.1  1.2  */
+		{   1,   0,   0, },
+		/* level: 2.0  2.1  2.2  */
+		{   1,   1,   0, },
+		/* level: 3.0  3.1  3.2  */
+		{   2,   3,   0, },
+		/* level: 4.0  4.1  4.2  */
+		{   5,   5,   0, },
+		/* level: 5.0  5.1  5.2  */
+		{  10,  10,  10, },
+		/* level: 6.0  6.1  6.2  */
+		{  20,  20,  20, }
+	};
+
+	/* TRM 3.11.11 */
+	static const unsigned int total_sample_per_mb[PIXEL_FORMAT_444 + 1] = {
+		256, 384, 384, 512, 768};
+
+	static const unsigned int HEVC_LEVEL_IDC_MIN = 30;
+	static const unsigned int HEVC_LEVEL_IDC_MAX = 186;
+	static const unsigned int GENC_ALIGNMENT = 0x1000;
+	static const unsigned int mb_size = 16;
+	static const unsigned int max_mb_rows_in_ctu = 4;
+	static const unsigned int bytes_per_fragment_pointer = 16;
+
+	const unsigned int max_tile_height_in_mbs =
+		seqhdr_info->max_frame_size.height / mb_size;
+
+	signed char level_maj = seqhdr_info->codec_level / 30;
+	signed char level_min = (seqhdr_info->codec_level % 30) / 3;
+
+	/*
+	 * If we are somehow able to deliver more information here (CTU size,
+	 * number of tile columns/rows) then memory usage could be reduced
+	 */
+	const struct pixel_pixinfo *pix_info = &seqhdr_info->pixel_info;
+	const unsigned int bit_depth = pix_info->bitdepth_y >= pix_info->bitdepth_c ?
+		pix_info->bitdepth_y : pix_info->bitdepth_c;
+	unsigned short max_slice_segments;
+	unsigned char max_tile_cols;
+	unsigned int raw_byte_per_mb;
+	unsigned int *genc_fragment_bufsize;
+	unsigned int *genc_buf_size;
+
+	/* Reset the MB parameters buffer size. */
+	size_info->mbparams_bufsize = 0;
+	*resource_needed = TRUE;
+
+	if (mbparam_allocinfo[std_idx].alloc_mbparam_bufs) {
+		/* shall be == 64 (0x40)*/
+		const unsigned int align = mbparam_allocinfo[std_idx].mbparam_size;
+		const unsigned int dpb_width = (max_pict_size->width + align * 2 - 1) / align * 2;
+		const unsigned int pic_height = (max_pict_size->height + align - 1) / align;
+		const unsigned int pic_width = (max_pict_size->width + align - 1) / align;
+
+		/* calculating for worst case: max frame size, B-frame */
+		size_info->mbparams_bufsize = (align * 2) * pic_width * pic_height +
+			align * dpb_width * pic_height;
+
+		/* Adjust the buffer size for MSVDX. */
+		vdecddutils_buf_vxd_adjust_size(&size_info->mbparams_bufsize);
+	}
+
+	if (seqhdr_info->codec_level > HEVC_LEVEL_IDC_MAX ||
+	    seqhdr_info->codec_level < HEVC_LEVEL_IDC_MIN) {
+		level_maj = 6;
+		level_min = 2;
+	}
+
+	if (level_maj > 0 && level_maj <= HEVC_LEVEL_MAJOR_NUM &&
+	    level_min >= 0 && level_min < HEVC_LEVEL_MINOR_NUM) {
+		max_slice_segments = max_slice_segments_list[level_maj - 1][level_min];
+		max_tile_cols = max_tile_cols_list[level_maj - 1][level_min];
+	} else {
+		pr_err("%s: Invalid parameters\n", __func__);
+		return IMG_ERROR_INVALID_PARAMETERS;
+	}
+
+	raw_byte_per_mb = total_sample_per_mb[pix_info->chroma_fmt_idc] *
+		VDEC_ALIGN_SIZE(bit_depth, 8, unsigned int, int) / 8;
+
+	genc_fragment_bufsize = &size_info->hevc_bufsize_pict.genc_fragment_bufsize;
+	genc_buf_size = &seqres_info->hevc_bufsize_seqres.genc_bufsize;
+
+	*genc_fragment_bufsize = bytes_per_fragment_pointer * (seqhdr_info->max_frame_size.height /
+		mb_size * max_tile_cols + max_slice_segments - 1) * max_mb_rows_in_ctu;
+
+	/*
+	 * GencBufferSize formula is taken from TRM and found by HW * CSIM teams for a sensible
+	 * streams i.e. size_of_stream < size_of_output_YUV. In videostream data base it's
+	 * possible to find pathological Argon streams that do not fulfill this sensible
+	 * requirement. eg. #58417, #58419, #58421, #58423. To make a #58417 stream running the
+	 * formula below should be changed from (2 * 384) *... ---> (3 * 384) *...
+	 * This solution is applied by DEVA.
+	 */
+	*genc_buf_size = 2 * raw_byte_per_mb * seqhdr_info->max_frame_size.width /
+		mb_size * max_tile_height_in_mbs / 4;
+
+	*genc_buf_size = VDEC_ALIGN_SIZE(*genc_buf_size, GENC_ALIGNMENT,
+					 unsigned int, unsigned int);
+	*genc_fragment_bufsize = VDEC_ALIGN_SIZE(*genc_fragment_bufsize, GENC_ALIGNMENT,
+						 unsigned int, unsigned int);
+
+#ifdef DEBUG_DECODER_DRIVER
+	pr_info("Sizes for GENC in HEVC: 0x%X (frag), 0x%X (x4)",
+		*genc_fragment_bufsize,
+		*genc_buf_size);
+#endif
+
+	seqres_info->hevc_bufsize_seqres.intra_bufsize = 4 * seqhdr_info->max_frame_size.width;
+	if (seqhdr_info->pixel_info.mem_pkg != PIXEL_BIT8_MP)
+		seqres_info->hevc_bufsize_seqres.intra_bufsize *= 2;
+
+	seqres_info->hevc_bufsize_seqres.aux_bufsize = (512 * 1024);
+
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function              core_is_hevc_stream_resource_suitable
+ */
+static unsigned char
+core_is_hevc_stream_resource_suitable(struct core_pict_resinfo *pict_res_info,
+				      struct core_pict_resinfo *old_pict_res_info,
+				      struct core_seq_resinfo *seq_res_info,
+				      struct core_seq_resinfo *old_seq_res_info)
+{
+	return (seq_res_info->hevc_bufsize_seqres.genc_bufsize <=
+	       old_seq_res_info->hevc_bufsize_seqres.genc_bufsize &&
+	       seq_res_info->hevc_bufsize_seqres.intra_bufsize <=
+	       old_seq_res_info->hevc_bufsize_seqres.intra_bufsize &&
+	       seq_res_info->hevc_bufsize_seqres.aux_bufsize <=
+	       old_seq_res_info->hevc_bufsize_seqres.aux_bufsize &&
+	       pict_res_info->size_info.hevc_bufsize_pict.genc_fragment_bufsize <=
+	       old_pict_res_info->size_info.hevc_bufsize_pict.genc_fragment_bufsize);
+}
+
+/*
+ * @Function  core_alloc_hevc_specific_seq_buffers
+ */
+static int
+core_alloc_hevc_specific_seq_buffers(struct core_stream_context *core_strctx,
+				     struct vdecdd_seq_resint *seqres_int,
+				     struct vxdio_mempool mempool,
+				     struct core_seq_resinfo *seqres_info)
+{
+	unsigned int i;
+	int ret = IMG_SUCCESS;
+
+	/* Allocate GENC buffers */
+	for (i = 0; i < GENC_BUFF_COUNT; ++i) {
+		/* Allocate the GENC buffer info structure. */
+		ret = core_alloc_resbuf(&seqres_int->genc_buffers[i],
+					seqres_info->hevc_bufsize_seqres.genc_bufsize,
+					core_strctx->dd_str_ctx->mmu_str_handle,
+					mempool);
+		if (ret != IMG_SUCCESS)
+			return ret;
+	}
+
+	seqres_int->genc_buf_id = ++core_strctx->std_spec_context.hevc_ctx.genc_id_gen;
+
+	/* Allocate the intra buffer info structure. */
+	ret = core_alloc_resbuf(&seqres_int->intra_buffer,
+				seqres_info->hevc_bufsize_seqres.intra_bufsize,
+				core_strctx->dd_str_ctx->mmu_str_handle,
+				mempool);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	/* Allocate the aux buffer info structure. */
+	ret = core_alloc_resbuf(&seqres_int->aux_buffer,
+				seqres_info->hevc_bufsize_seqres.aux_bufsize,
+				core_strctx->dd_str_ctx->mmu_str_handle,
+				mempool);
+	if (ret != IMG_SUCCESS)
+		return ret;
+
+	return IMG_SUCCESS;
+}
+
+/*
+ * @Function              core_alloc_hevc_specific_pict_buffers
+ */
+static int
+core_alloc_hevc_specific_pict_buffers(struct core_stream_context *core_strctx,
+				      struct vdecdd_pict_resint *pict_res_int,
+				      struct vxdio_mempool mempool,
+				      struct core_pict_resinfo *pict_res_info)
+{
+	int ret;
+
+	/* Allocate the GENC fragment buffer. */
+	ret = core_alloc_resbuf(&pict_res_int->genc_fragment_buf,
+				pict_res_info->size_info.hevc_bufsize_pict.genc_fragment_bufsize,
+				core_strctx->dd_str_ctx->mmu_str_handle,
+				mempool);
+
+	return ret;
+}
+#endif
diff --git a/drivers/staging/media/vxd/decoder/core.h b/drivers/staging/media/vxd/decoder/core.h
new file mode 100644
index 000000000000..23a2ec835a15
--- /dev/null
+++ b/drivers/staging/media/vxd/decoder/core.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * VXD Decoder CORE and V4L2 Node Interface header
+ *
+ * Copyright (c) Imagination Technologies Ltd.
+ * Copyright (c) 2021 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * Authors:
+ *	Sunita Nadampalli <sunitan@xxxxxx>
+ *
+ * Re-written for upstream
+ *      Sidraya Jayagond <sidraya.bj@xxxxxxxxxxxxxxxxxxx>
+ *      Prashanth Kumar Amai <prashanth.ka@xxxxxxxxxxxxxxxxxxx>
+ */
+
+#ifndef __CORE_H__
+#define __CORE_H__
+
+#include <linux/types.h>
+#include "decoder.h"
+
+int core_initialise(void *dev_handle, unsigned int internal_heap_id,
+		    void *cb);
+
+/**
+ * core_deinitialise - deinitialise core
+ */
+int core_deinitialise(void);
+
+int core_supported_features(struct vdec_features *features);
+
+int core_stream_create(void *vxd_dec_ctx_arg,
+		       const struct vdec_str_configdata *str_cfgdata,
+		       unsigned int *res_str_id);
+
+int core_stream_destroy(unsigned int res_str_id);
+
+int core_stream_play(unsigned int res_str_id);
+
+int core_stream_stop(unsigned int res_str_id);
+
+int core_stream_map_buf(unsigned int res_str_id, enum vdec_buf_type buf_type,
+			struct vdec_buf_info *buf_info, unsigned int *buf_map_id);
+
+int core_stream_map_buf_sg(unsigned int res_str_id,
+			   enum vdec_buf_type buf_type,
+			   struct vdec_buf_info *buf_info,
+			   void *sgt, unsigned int *buf_map_id);
+
+int core_stream_unmap_buf(unsigned int buf_map_id);
+
+int core_stream_unmap_buf_sg(unsigned int buf_map_id);
+
+int core_stream_submit_unit(unsigned int res_str_id,
+			    struct vdecdd_str_unit *str_unit);
+
+int core_stream_fill_pictbuf(unsigned int buf_map_id);
+
+/* This function to be called before stream play */
+int core_stream_set_output_config(unsigned int res_str_id,
+				  struct vdec_str_opconfig *str_opcfg,
+				  struct vdec_pict_bufconfig *pict_bufcg);
+
+int core_stream_flush(unsigned int res_str_id, unsigned char discard_refs);
+
+int core_stream_release_bufs(unsigned int res_str_id,
+			     enum vdec_buf_type buf_type);
+
+int core_stream_get_status(unsigned int res_str_id,
+			   struct vdecdd_decstr_status *str_status);
+
+#endif
-- 
2.17.1


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