Re: [RFC PATCH 3/3] drm/i915: Enabling WD Transcoder

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++Laurent ,Dmitry, Abhinav and Rob
> Adding support for writeback transcoder to start capturing frames using
> interrupt mechanism
> 
> Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/Makefile                 |   1 +
>  drivers/gpu/drm/i915/display/intel_acpi.c     |   1 +
>  drivers/gpu/drm/i915/display/intel_display.c  |  89 +-
>  drivers/gpu/drm/i915/display/intel_display.h  |   9 +
>  .../drm/i915/display/intel_display_types.h    |  13 +
>  drivers/gpu/drm/i915/display/intel_dpll.c     |   3 +
>  drivers/gpu/drm/i915/display/intel_opregion.c |   3 +
>  drivers/gpu/drm/i915/display/intel_wd.c       | 978 ++++++++++++++++++
>  drivers/gpu/drm/i915/display/intel_wd.h       |  82 ++
>  drivers/gpu/drm/i915/i915_drv.h               |   2 +
>  drivers/gpu/drm/i915/i915_irq.c               |   8 +-
>  drivers/gpu/drm/i915/i915_pci.c               |   7 +-
>  drivers/gpu/drm/i915/i915_reg.h               | 137 +++
>  13 files changed, 1330 insertions(+), 3 deletions(-)  create mode 100644
> drivers/gpu/drm/i915/display/intel_wd.c
>  create mode 100644 drivers/gpu/drm/i915/display/intel_wd.h
> 
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 087bd9d1b397..5ee32513a945 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -287,6 +287,7 @@ i915-y += \
>  	display/intel_vdsc.o \
>  	display/intel_vrr.o \
>  	display/intel_wb_connector.o\
> +	display/intel_wd.o\
>  	display/vlv_dsi.o \
>  	display/vlv_dsi_pll.o
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c
> b/drivers/gpu/drm/i915/display/intel_acpi.c
> index e78430001f07..ae08db164f73 100644
> --- a/drivers/gpu/drm/i915/display/intel_acpi.c
> +++ b/drivers/gpu/drm/i915/display/intel_acpi.c
> @@ -247,6 +247,7 @@ static u32 acpi_display_type(struct intel_connector
> *connector)
>  	case DRM_MODE_CONNECTOR_LVDS:
>  	case DRM_MODE_CONNECTOR_eDP:
>  	case DRM_MODE_CONNECTOR_DSI:
> +	case DRM_MODE_CONNECTOR_WRITEBACK:
>  		display_type = ACPI_DISPLAY_TYPE_INTERNAL_DIGITAL;
>  		break;
>  	case DRM_MODE_CONNECTOR_Unknown:
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index eb49973621f0..6dedc7921f54 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -111,6 +111,7 @@
>  #include "intel_sprite.h"
>  #include "intel_tc.h"
>  #include "intel_vga.h"
> +#include "intel_wd.h"
>  #include "i9xx_plane.h"
>  #include "skl_scaler.h"
>  #include "skl_universal_plane.h"
> @@ -1544,6 +1545,72 @@ static void
> intel_encoders_update_complete(struct intel_atomic_state *state)
>  	}
>  }
> 
> +static void intel_queue_writeback_job(struct intel_atomic_state *state,
> +		struct intel_crtc *intel_crtc, struct intel_crtc_state
> *crtc_state) {
> +	struct drm_connector_state *new_conn_state;
> +	struct drm_connector *connector;
> +	struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
> +	struct intel_wd *intel_wd;
> +	struct intel_connector *intel_connector;
> +	struct intel_digital_connector_state *intel_conn_state;
> +	struct intel_encoder *encoder;
> +	int i;
> +
> +	for_each_intel_encoder_with_wd(&i915->drm, encoder) {
> +		intel_wd = enc_to_intel_wd(encoder);
> +
> +		if (intel_wd->wd_crtc != intel_crtc)
> +			return;
> +
> +	}
> +
> +	for_each_new_connector_in_state(&state->base, connector,
> new_conn_state,
> +					i) {
> +		intel_conn_state =
> to_intel_digital_connector_state(new_conn_state);
> +		if (!intel_conn_state->job)
> +			continue;
> +		intel_connector = to_intel_connector(connector);
> +		intel_writeback_queue_job(&intel_connector->wb_conn,
> new_conn_state);
> +		drm_dbg_kms(&i915->drm, "queueing writeback job\n");
> +	}
> +}
> +
> +static void intel_find_writeback_connector(struct intel_atomic_state
> *state,
> +		struct intel_crtc *intel_crtc, struct intel_crtc_state
> *crtc_state) {
> +	struct drm_connector_state *new_conn_state;
> +	struct drm_connector *connector;
> +	struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
> +	struct intel_wd *intel_wd;
> +	struct intel_encoder *encoder;
> +	int i;
> +
> +	for_each_intel_encoder_with_wd(&i915->drm, encoder) {
> +		intel_wd = enc_to_intel_wd(encoder);
> +
> +		if (intel_wd->wd_crtc != intel_crtc)
> +			return;
> +
> +	}
> +
> +	for_each_new_connector_in_state(&state->base, connector,
> new_conn_state,
> +					i) {
> +		struct intel_connector *intel_connector;
> +
> +		intel_connector = to_intel_connector(connector);
> +		drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s]: status:
> %s\n",
> +				connector->base.id, connector->name,
> +
> 	drm_get_connector_status_name(connector->status));
> +		encoder =
> intel_connector_primary_encoder(intel_connector);
> +		if (encoder->type == INTEL_OUTPUT_WD) {
> +			drm_dbg_kms(&i915->drm, "encoder
> intel_output_wd found\n");
> +			intel_wd_enable_capture(encoder, crtc_state,
> new_conn_state);
> +		}
> +	}
> +
> +}
> +
>  static void intel_encoders_pre_pll_enable(struct intel_atomic_state *state,
>  					  struct intel_crtc *crtc)
>  {
> @@ -1944,7 +2011,8 @@ static void hsw_crtc_enable(struct
> intel_atomic_state *state,
>  		bdw_set_pipemisc(new_crtc_state);
> 
>  	if (!intel_crtc_is_bigjoiner_slave(new_crtc_state) &&
> -	    !transcoder_is_dsi(cpu_transcoder))
> +	    !transcoder_is_dsi(cpu_transcoder) &&
> +	    !transcoder_is_wd(cpu_transcoder))
>  		hsw_configure_cpu_transcoder(new_crtc_state);
> 
>  	crtc->active = true;
> @@ -2632,6 +2700,9 @@ static void intel_connector_verify_state(struct
> intel_crtc_state *crtc_state,
>  	if (connector->get_hw_state(connector)) {
>  		struct intel_encoder *encoder =
> intel_attached_encoder(connector);
> 
> +		if (conn_state->connector->connector_type ==
> DRM_MODE_CONNECTOR_WRITEBACK)
> +			return;
> +
>  		I915_STATE_WARN(!crtc_state,
>  			 "connector enabled without attached crtc\n");
> 
> @@ -5233,6 +5304,7 @@ static const char * const output_type_str[] = {
>  	OUTPUT_TYPE(DSI),
>  	OUTPUT_TYPE(DDI),
>  	OUTPUT_TYPE(DP_MST),
> +	OUTPUT_TYPE(WD),
>  };
> 
>  #undef OUTPUT_TYPE
> @@ -8577,6 +8649,12 @@ static void intel_atomic_commit_tail(struct
> intel_atomic_state *state)
>  		}
>  	}
> 
> +	if (DISPLAY_VER(dev_priv) >= 12) {
> +		for_each_new_intel_crtc_in_state(state, crtc,
> new_crtc_state, i) {
> +			intel_wd_set_vblank_event(crtc, new_crtc_state);
> +		}
> +	}
> +
>  	intel_encoders_update_prepare(state);
> 
>  	intel_dbuf_pre_plane_update(state);
> @@ -8662,6 +8740,14 @@ static void intel_atomic_commit_tail(struct
> intel_atomic_state *state)
> 
>  	intel_sagv_post_plane_update(state);
> 
> +	if (DISPLAY_VER(dev_priv) >= 12) {
> +		intel_wd_prepare_out_fence(dev, &state->base);
> +		for_each_new_intel_crtc_in_state(state, crtc,
> new_crtc_state, i) {
> +			intel_queue_writeback_job(state, crtc,
> new_crtc_state);
> +			intel_find_writeback_connector(state, crtc,
> new_crtc_state);
> +		}
> +	}
> +
>  	drm_atomic_helper_commit_hw_done(&state->base);
> 
>  	if (state->modeset) {
> @@ -8966,6 +9052,7 @@ static void intel_setup_outputs(struct
> drm_i915_private *dev_priv)
>  		intel_ddi_init(dev_priv, PORT_TC1);
>  		intel_ddi_init(dev_priv, PORT_TC2);
>  	} else if (DISPLAY_VER(dev_priv) >= 12) {
> +		intel_wd_init(dev_priv, TRANSCODER_WD_0);
>  		intel_ddi_init(dev_priv, PORT_A);
>  		intel_ddi_init(dev_priv, PORT_B);
>  		intel_ddi_init(dev_priv, PORT_TC1);
> diff --git a/drivers/gpu/drm/i915/display/intel_display.h
> b/drivers/gpu/drm/i915/display/intel_display.h
> index 8c93a5de8e07..27237d36a888 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.h
> +++ b/drivers/gpu/drm/i915/display/intel_display.h
> @@ -156,6 +156,11 @@ static inline bool transcoder_is_dsi(enum transcoder
> transcoder)
>  	return transcoder == TRANSCODER_DSI_A || transcoder ==
> TRANSCODER_DSI_C;  }
> 
> +static inline bool transcoder_is_wd(enum transcoder transcoder) {
> +	return transcoder == TRANSCODER_WD_0 || transcoder ==
> TRANSCODER_WD_1;
> +}
> +
>  /*
>   * Global legacy plane identifier. Valid only for primary/sprite
>   * planes on pre-g4x, and only for primary planes on g4x-bdw.
> @@ -467,6 +472,10 @@ enum hpd_pin {
>  	for_each_intel_encoder((dev), (intel_encoder)) \
>  		for_each_if(intel_encoder_can_psr(intel_encoder))
> 
> +#define for_each_intel_encoder_with_wd(dev, intel_encoder)	\
> +	for_each_intel_encoder(dev, intel_encoder)		\
> +		for_each_if(intel_encoder_is_wd(intel_encoder))
> +
>  #define for_each_intel_connector_iter(intel_connector, iter) \
>  	while ((intel_connector =
> to_intel_connector(drm_connector_list_iter_next(iter))))
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index dcb4ad43cf88..8522c348a73d 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1293,6 +1293,11 @@ struct intel_crtc {
>  	bool cpu_fifo_underrun_disabled;
>  	bool pch_fifo_underrun_disabled;
> 
> +	struct {
> +		struct drm_pending_vblank_event *e;
> +		atomic_t work_busy;
> +		wait_queue_head_t wd_wait;
> +	} wd;
>  	/* per-pipe watermark state */
>  	struct {
>  		/* watermarks currently being used  */ @@ -1420,6 +1425,7
> @@ struct cxsr_latency {  #define to_intel_crtc(x) container_of(x, struct
> intel_crtc, base)  #define to_intel_crtc_state(x) container_of(x, struct
> intel_crtc_state, uapi)  #define to_intel_connector(x) container_of(x, struct
> intel_connector, base)
> +#define to_intel_wb_connector(x) container_of(x, struct
> +intel_wb_connector, base)
>  #define to_intel_encoder(x) container_of(x, struct intel_encoder, base)
> #define to_intel_framebuffer(x) container_of(x, struct intel_framebuffer,
> base)  #define to_intel_plane(x) container_of(x, struct intel_plane, base)
> @@ -1851,6 +1857,13 @@ static inline bool intel_encoder_is_dp(struct
> intel_encoder *encoder)
>  	}
>  }
> 
> +static inline bool intel_encoder_is_wd(struct intel_encoder *encoder) {
> +	if (encoder->type == INTEL_OUTPUT_WD)
> +		return true;
> +	return false;
> +}
> +
>  static inline struct intel_lspcon *
>  enc_to_intel_lspcon(struct intel_encoder *encoder)  { diff --git
> a/drivers/gpu/drm/i915/display/intel_dpll.c
> b/drivers/gpu/drm/i915/display/intel_dpll.c
> index 95b9d327ed4d..dfea17f5f99d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll.c
> @@ -939,6 +939,9 @@ static int hsw_crtc_compute_clock(struct
> intel_crtc_state *crtc_state)
>  	if (IS_DG2(dev_priv))
>  		return intel_mpllb_calc_state(crtc_state, encoder);
> 
> +	if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_WD))
> +		return 0;
> +
>  	if (DISPLAY_VER(dev_priv) < 11 &&
>  	    intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DSI))
>  		return 0;
> diff --git a/drivers/gpu/drm/i915/display/intel_opregion.c
> b/drivers/gpu/drm/i915/display/intel_opregion.c
> index f31e8c3f8ce0..b7a0ac9bad05 100644
> --- a/drivers/gpu/drm/i915/display/intel_opregion.c
> +++ b/drivers/gpu/drm/i915/display/intel_opregion.c
> @@ -370,6 +370,9 @@ int intel_opregion_notify_encoder(struct
> intel_encoder *intel_encoder,
>  	if (ret)
>  		return ret;
> 
> +	if (intel_encoder->type == INTEL_OUTPUT_WD)
> +		return 0;
> +
>  	if (intel_encoder->type == INTEL_OUTPUT_DSI)
>  		port = 0;
>  	else
> diff --git a/drivers/gpu/drm/i915/display/intel_wd.c
> b/drivers/gpu/drm/i915/display/intel_wd.c
> new file mode 100644
> index 000000000000..a6c9350c3986
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/display/intel_wd.c
> @@ -0,0 +1,978 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright © 2021 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person
> +obtaining a
> + * copy of this software and associated documentation files (the
> +"Software"),
> + * to deal in the Software without restriction, including without
> +limitation
> + * the rights to use, copy, modify, merge, publish, distribute,
> +sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom
> +the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the
> +next
> + * paragraph) shall be included in all copies or substantial portions
> +of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> +EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> +MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO
> EVENT
> +SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR
> +OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> +ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> OTHER
> +DEALINGS
> + * IN THE SOFTWARE.
> + *
> + * Authors:
> + *	Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
> + *	Arun Murthy <arun.r.murthy@xxxxxxxxx>
> + *
> + */
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_fourcc.h>
> +
> +#include "intel_atomic.h"
> +#include "intel_connector.h"
> +#include "intel_wd.h"
> +#include "intel_fb_pin.h"
> +#include "intel_de.h"
> +#include "intel_wb_connector.h"
> +
> +enum {
> +	WD_CAPTURE_4_PIX,
> +	WD_CAPTURE_2_PIX,
> +} wd_capture_format;
> +
> +static struct intel_writeback_job
> +*intel_get_writeback_job_from_queue(struct intel_wd *intel_wd) {
> +	struct intel_writeback_job *job;
> +	struct drm_i915_private *i915 = to_i915(intel_wd->base.base.dev);
> +	struct intel_writeback_connector *wb_conn =
> +		&intel_wd->attached_connector->wb_conn;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&wb_conn->job_lock, flags);
> +	job = list_first_entry_or_null(&wb_conn->job_queue,
> +			struct intel_writeback_job,
> +			list_entry);
> +	spin_unlock_irqrestore(&wb_conn->job_lock, flags);
> +	if (job == NULL) {
> +		drm_dbg_kms(&i915->drm, "job queue is empty\n");
> +		return NULL;
> +	}
> +
> +	return job;
> +}
> +
> +/*Check with Spec*/
> +static const u32 wb_fmts[] = {
> +		DRM_FORMAT_YUV444,
> +		DRM_FORMAT_XYUV8888,
> +		DRM_FORMAT_XBGR8888,
> +		DRM_FORMAT_XRGB8888,
> +		DRM_FORMAT_Y410,
> +		DRM_FORMAT_YUV422,
> +		DRM_FORMAT_XBGR2101010,
> +		DRM_FORMAT_RGB565,
> +
> +};
> +
> +static int intel_wd_get_format(int pixel_format) {
> +	int wd_format = -EINVAL;
> +
> +	switch (pixel_format) {
> +	case DRM_FORMAT_XBGR8888:
> +	case DRM_FORMAT_XRGB8888:
> +	case DRM_FORMAT_XBGR2101010:
> +	case DRM_FORMAT_XYUV8888:
> +	case DRM_FORMAT_YUV444:
> +		wd_format = WD_CAPTURE_4_PIX;
> +		break;
> +	case DRM_FORMAT_YUV422:
> +	case DRM_FORMAT_RGB565:
> +		wd_format = WD_CAPTURE_2_PIX;
> +		break;
> +	default:
> +		DRM_ERROR("unsupported pixel format %x!\n",
> +			pixel_format);
> +	}
> +
> +	return wd_format;
> +}
> +
> +static int intel_wd_verify_pix_format(int format) {
> +	const struct drm_format_info *info = drm_format_info(format);
> +	int pix_format = info->format;
> +	int i = 0;
> +
> +	for (i = 0; i < ARRAY_SIZE(wb_fmts); i++)
> +		if (pix_format == wb_fmts[i])
> +			return 0;
> +
> +	return 1;
> +}
> +
> +static u32 intel_wd_get_stride(const struct intel_crtc_state *crtc_state,
> +			int format)
> +{
> +	const struct drm_format_info *info = drm_format_info(format);
> +	int wd_format;
> +	int hactive, pixel_size;
> +
> +	wd_format = intel_wd_get_format(info->format);
> +
> +	switch (wd_format) {
> +	case WD_CAPTURE_4_PIX:
> +		pixel_size = 4;
> +		break;
> +	case WD_CAPTURE_2_PIX:
> +		pixel_size = 2;
> +		break;
> +	default:
> +		pixel_size = 1;
> +		break;
> +	}
> +
> +	hactive = crtc_state->hw.adjusted_mode.crtc_hdisplay;
> +
> +	return DIV_ROUND_UP(hactive * pixel_size, 64); }
> +
> +static int intel_wd_pin_fb(struct intel_wd *intel_wd,
> +			struct drm_framebuffer *fb)
> +{
> +	const struct i915_ggtt_view view = {
> +		.type = I915_GGTT_VIEW_NORMAL,
> +		};
> +	struct i915_vma *vma;
> +
> +	vma = intel_pin_and_fence_fb_obj(fb, false, &view, false,
> +			&intel_wd->flags);
> +
> +	if (IS_ERR(vma))
> +		return PTR_ERR(vma);
> +
> +	intel_wd->vma = vma;
> +	return 0;
> +}
> +
> +static void intel_configure_slicing_strategy(struct drm_i915_private *i915,
> +		struct intel_wd *intel_wd, u32 *tmp)
> +{
> +	*tmp &= ~WD_STRAT_MASK;
> +	if (intel_wd->slicing_strategy == 1)
> +		*tmp |= WD_SLICING_STRAT_1_1;
> +	else if (intel_wd->slicing_strategy == 2)
> +		*tmp |= WD_SLICING_STRAT_2_1;
> +	else if (intel_wd->slicing_strategy == 3)
> +		*tmp |= WD_SLICING_STRAT_4_1;
> +	else if (intel_wd->slicing_strategy == 4)
> +		*tmp |= WD_SLICING_STRAT_8_1;
> +
> +	intel_de_write(i915, WD_STREAMCAP_CTL(intel_wd->trans),
> +			*tmp);
> +
> +}
> +
> +static enum drm_mode_status
> +intel_wd_mode_valid(struct drm_connector *connector,
> +		struct drm_display_mode *mode)
> +{
> +	return MODE_OK;
> +}
> +
> +static int intel_wd_get_modes(struct drm_connector *connector) {
> +	return 0;
> +}
> +
> +static void intel_wd_get_config(struct intel_encoder *encoder,
> +		struct intel_crtc_state *pipe_config) {
> +	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +	struct intel_crtc *intel_crtc =
> +		to_intel_crtc(pipe_config->uapi.crtc);
> +
> +	drm_dbg_kms(&i915->drm, "\n");
> +	if (intel_crtc) {
> +		memcpy(pipe_config, intel_crtc->config,
> +			sizeof(*pipe_config));
> +		pipe_config->output_types |= BIT(INTEL_OUTPUT_WD);
> +		drm_dbg_kms(&i915->drm, "crtc found\n");
> +	}
> +
> +}
> +
> +static int intel_wd_compute_config(struct intel_encoder *encoder,
> +			struct intel_crtc_state *pipe_config,
> +			struct drm_connector_state *conn_state) {
> +	struct intel_wd *intel_wd = enc_to_intel_wd(encoder);
> +	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +	struct intel_digital_connector_state *intel_conn_state =
> +		to_intel_digital_connector_state(conn_state);
> +	struct intel_writeback_job *job;
> +
> +	drm_dbg_kms(&i915->drm, "\n");
> +	job = intel_get_writeback_job_from_queue(intel_wd);
> +	if (job || intel_conn_state->job) {
> +		intel_wd->wd_crtc = to_intel_crtc(pipe_config->uapi.crtc);
> +		return 0;
> +	}
> +	drm_dbg_kms(&i915->drm, "No writebackjob in queue\n");
> +
> +	return 0;
> +}
> +
> +static void intel_wd_get_power_domains(struct intel_encoder *encoder,
> +			struct intel_crtc_state *crtc_state) {
> +	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +	struct intel_wd *intel_wd = enc_to_intel_wd(encoder);
> +	intel_wakeref_t wakeref;
> +
> +	wakeref = intel_display_power_get(i915,
> +				encoder->power_domain);
> +
> +	intel_wd->io_wakeref[0] = wakeref;
> +	drm_dbg_kms(&i915->drm, "\n");
> +}
> +
> +static bool intel_wd_get_hw_state(struct intel_encoder *encoder,
> +		enum pipe *pipe)
> +{
> +	bool ret = false;
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	struct intel_wd *intel_wd = enc_to_intel_wd(encoder);
> +	struct intel_crtc *wd_crtc = intel_wd->wd_crtc;
> +	intel_wakeref_t wakeref;
> +	u32 tmp;
> +
> +	if (wd_crtc)
> +		return false;
> +
> +	wakeref = intel_display_power_get_if_enabled(dev_priv,
> +				encoder->power_domain);
> +	drm_dbg_kms(encoder->base.dev, "power enabled : %s\n",
> +			!wakeref ? "false":"true");
> +
> +	if (!wakeref)
> +		return false;
> +
> +	tmp = intel_de_read(dev_priv, PIPECONF(intel_wd->trans));
> +	ret = tmp & WD_TRANS_ACTIVE;
> +	drm_dbg_kms(encoder->base.dev, "trancoder enabled: %s\n",
> +			ret ? "true":"false");
> +	if (ret) {
> +		*pipe = wd_crtc->pipe;
> +		drm_dbg_kms(encoder->base.dev, "pipe selected is %d\n",
> +			wd_crtc->pipe);
> +	}
> +	return true;
> +}
> +
> +static int intel_wd_encoder_atomic_check(struct drm_encoder *encoder,
> +				    struct drm_crtc_state *crtc_st,
> +				    struct drm_connector_state *conn_st) {
> +	/* Check for the format and buffers and property validity */
> +	struct drm_framebuffer *fb;
> +	struct intel_digital_connector_state *intel_conn_state =
> +		to_intel_digital_connector_state(conn_st);
> +	struct intel_writeback_job *job = intel_conn_state->job;
> +	struct drm_i915_private *i915 = to_i915(encoder->dev);
> +	const struct drm_display_mode *mode = &crtc_st->mode;
> +	int ret;
> +
> +	drm_dbg_kms(&i915->drm, "\n");
> +
> +	if (!job) {
> +		drm_dbg_kms(&i915->drm, "No writeback job created
> returning\n");
> +		return -EINVAL;
> +	}
> +
> +	fb = job->fb;
> +
> +	if (!fb) {
> +		drm_dbg_kms(&i915->drm, "Invalid framebuffer\n");
> +		return -EINVAL;
> +	}
> +
> +	if (fb->width != mode->hdisplay || fb->height != mode->vdisplay) {
> +		drm_dbg_kms(&i915->drm, "Invalid framebuffer size
> %ux%u\n",
> +				fb->width, fb->height);
> +		return -EINVAL;
> +	}
> +
> +	ret = intel_wd_verify_pix_format(fb->format->format);
> +
> +	if (ret) {
> +		drm_dbg_kms(&i915->drm, "Unsupported framebuffer
> format %08x\n",
> +				fb->format->format);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +
> +static const struct drm_encoder_helper_funcs wd_encoder_helper_funcs
> = {
> +	.atomic_check = intel_wd_encoder_atomic_check, };
> +
> +static void intel_wd_connector_destroy(struct drm_connector *connector)
> +{
> +	drm_dbg_kms(connector->dev, "\n");
> +	drm_connector_cleanup(connector);
> +	kfree(connector);
> +}
> +
> +static enum drm_connector_status
> +intel_wb_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	drm_dbg_kms(connector->dev, "Writeback connector
> connected\n");
> +	return connector_status_connected;
> +}
> +
> +static int intel_atomic_set_writeback_fb_for_connector(
> +		struct drm_connector_state *conn_state,
> +		struct drm_framebuffer *fb)
> +{
> +	int ret;
> +	struct drm_connector *conn = conn_state->connector;
> +
> +	ret = intel_writeback_set_fb(conn_state, fb);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (fb)
> +		drm_dbg_atomic(conn->dev,
> +			"Set [FB:%d] for connector state %p\n",
> +			fb->base.id, conn_state);
> +	else
> +		drm_dbg_atomic(conn->dev,
> +			"Set [NOFB] for connector state %p\n",
> +			conn_state);
> +
> +	return 0;
> +}
> +
> +static int set_out_fence_for_connector(struct drm_atomic_state *state,
> +					struct drm_connector *connector,
> +					s32 __user *fence_ptr)
> +{
> +	unsigned int index = drm_connector_index(connector);
> +
> +	if (!fence_ptr)
> +		return 0;
> +
> +	if (put_user(-1, fence_ptr))
> +		return -EFAULT;
> +
> +	state->connectors[index].out_fence_ptr = fence_ptr;
> +
> +	return 0;
> +}
> +
> +static struct drm_mode_object *__intel_object_find(struct drm_device
> *dev,
> +					       uint32_t id, uint32_t type) {
> +	struct drm_mode_object *obj = NULL;
> +
> +	mutex_lock(&dev->mode_config.idr_mutex);
> +	obj = idr_find(&dev->mode_config.object_idr, id);
> +	if (obj && type != DRM_MODE_OBJECT_ANY && obj->type != type)
> +		obj = NULL;
> +	if (obj && obj->id != id)
> +		obj = NULL;
> +	if (obj && obj->free_cb) {
> +		if (!kref_get_unless_zero(&obj->refcount))
> +			obj = NULL;
> +	}
> +	mutex_unlock(&dev->mode_config.idr_mutex);
> +
> +	return obj;
> +}
> +
> +static struct drm_framebuffer *intel_wb_framebuffer_lookup(struct
> drm_device *dev,
> +					       uint32_t id)
> +{
> +	struct drm_mode_object *obj;
> +	struct drm_framebuffer *fb = NULL;
> +
> +	obj = __intel_object_find(dev, id, DRM_MODE_OBJECT_FB);
> +	if (obj)
> +		fb = obj_to_fb(obj);
> +	return fb;
> +}
> +
> +static s32 *intel_get_out_fence_for_connector(struct drm_atomic_state
> *state,
> +					       struct drm_connector
> *connector) {
> +	unsigned int index = drm_connector_index(connector);
> +	s32 __user *fence_ptr;
> +
> +	fence_ptr = state->connectors[index].out_fence_ptr;
> +	state->connectors[index].out_fence_ptr = NULL;
> +
> +	return fence_ptr;
> +}
> +
> +static int intel_setup_out_fence(struct intel_out_fence_state
> *fence_state,
> +			   struct dma_fence *fence)
> +{
> +
> +	fence_state->fd = get_unused_fd_flags(O_CLOEXEC);
> +	if (fence_state->fd < 0)
> +		return fence_state->fd;
> +
> +	if (put_user(fence_state->fd, fence_state->out_fence_ptr))
> +		return -EFAULT;
> +
> +	fence_state->sync_file = sync_file_create(fence);
> +	if (!fence_state->sync_file)
> +		return -ENOMEM;
> +
> +	return 0;
> +}
> +
> +int intel_wd_prepare_out_fence(struct drm_device *dev,
> +				struct drm_atomic_state *state)
> +{
> +	struct drm_connector *conn;
> +	struct drm_connector_state *conn_state;
> +	int i, ret;
> +
> +	drm_dbg_kms(dev, "\n");
> +
> +	for_each_new_connector_in_state(state, conn, conn_state, i) {
> +		struct intel_writeback_connector *wb_conn;
> +		struct intel_connector *intel_conn =
> +			to_intel_connector(conn);
> +		struct dma_fence *fence;
> +		struct intel_wd *intel_wd;
> +		struct intel_digital_connector_state *intel_conn_state =
> +			to_intel_digital_connector_state(conn_state);
> +		s32 __user *fence_ptr;
> +
> +		if (conn->connector_type !=
> DRM_MODE_CONNECTOR_WRITEBACK)
> +			continue;
> +
> +		if (!intel_conn_state->job)
> +			continue;
> +
> +		intel_wd = enc_to_intel_wd(intel_conn->encoder);
> +		fence_ptr = intel_get_out_fence_for_connector(state,
> conn);
> +		if (!fence_ptr)
> +			continue;
> +
> +		intel_wd->fence_state->out_fence_ptr = fence_ptr;
> +
> +		wb_conn = &intel_conn->wb_conn;
> +		fence = intel_writeback_get_out_fence(wb_conn);
> +		if (!fence)
> +			return -ENOMEM;
> +
> +		ret = intel_setup_out_fence(intel_wd->fence_state, fence);
> +		if (ret) {
> +			dma_fence_put(fence);
> +			return ret;
> +		}
> +
> +		intel_conn_state->job->out_fence = fence;
> +	}
> +
> +	return 0;
> +}
> +
> +void intel_wd_complete_signaling(struct intel_wd *intel_wd) {
> +	struct intel_out_fence_state *fence_state;
> +
> +	fence_state = intel_wd->fence_state;
> +	fd_install(fence_state->fd,
> +		fence_state->sync_file->file);
> +
> +}
> +
> +static int intel_set_writeback_property(struct drm_connector *connector,
> +	struct drm_connector_state *state, struct drm_property *property,
> +	uint64_t val)
> +{
> +	struct drm_device *dev = connector->dev;
> +	struct drm_i915_private *i915 = to_i915(dev);
> +
> +	if (property == i915->wb_fb_id_property) {
> +		struct drm_framebuffer *fb;
> +		int ret;
> +
> +		fb = intel_wb_framebuffer_lookup(dev, val);
> +		ret = intel_atomic_set_writeback_fb_for_connector(state,
> fb);
> +		if (fb)
> +			drm_framebuffer_put(fb);
> +		return ret;
> +	} else if (property == i915->wb_out_fence_ptr_property) {
> +		s32 __user *fence_ptr = u64_to_user_ptr(val);
> +
> +		return set_out_fence_for_connector(state->state,
> connector,
> +						fence_ptr);
> +	} else {
> +		drm_dbg_atomic(connector->dev,
> +			"[CONNECTOR:%d:%s] unknown property
> [PROP:%d:%s]]\n",
> +			connector->base.id, connector->name,
> +			property->base.id, property->name);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +
> +}
> +
> +static int intel_get_writeback_property(struct drm_connector *connector,
> +	const struct drm_connector_state *state, struct drm_property
> *property,
> +	uint64_t *val)
> +{
> +	struct drm_device *dev = connector->dev;
> +	struct drm_i915_private *i915 = to_i915(dev);
> +
> +	if (property == i915->wb_fb_id_property)
> +		*val = 0;
> +	else if (property == i915->wb_out_fence_ptr_property)
> +		*val = 0;
> +	else {
> +		drm_dbg_atomic(&i915->drm,
> +				"Unknown property [PROP:%d:%s]\n",
> +				property->base.id, property->name);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct drm_connector_funcs wd_connector_funcs = {
> +	.detect = intel_wb_connector_detect,
> +	.reset = drm_atomic_helper_connector_reset,
> +	.destroy = intel_wd_connector_destroy,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.atomic_destroy_state =
> drm_atomic_helper_connector_destroy_state,
> +	.atomic_set_property = intel_set_writeback_property,
> +	.atomic_get_property = intel_get_writeback_property,
> +	.atomic_duplicate_state = intel_digital_connector_duplicate_state,
> +};
> +
> +static const struct drm_connector_helper_funcs
> wd_connector_helper_funcs = {
> +	.get_modes = intel_wd_get_modes,
> +	.mode_valid = intel_wd_mode_valid,
> +};
> +
> +static bool intel_fastset_dis(struct intel_encoder *encoder,
> +		struct intel_crtc_state *pipe_config) {
> +	pipe_config->uapi.mode_changed = true;
> +	drm_dbg_kms(encoder->base.dev, "\n");
> +	return false;
> +}
> +
> +void intel_wd_init(struct drm_i915_private *i915, enum transcoder
> +trans) {
> +	struct intel_wd *intel_wd;
> +	struct intel_encoder *encoder;
> +	struct intel_out_fence_state *fence_state;
> +	struct intel_connector *intel_connector;
> +	struct intel_writeback_connector *wb_conn;
> +	int n_formats = ARRAY_SIZE(wb_fmts);
> +	int err;
> +
> +	drm_dbg_kms(&i915->drm, "\n");
> +	intel_wd = kzalloc(sizeof(*intel_wd), GFP_KERNEL);
> +	if (!intel_wd)
> +		return;
> +
> +	intel_connector = intel_connector_alloc();
> +	if (!intel_connector) {
> +		kfree(intel_wd);
> +		return;
> +	}
> +
> +	fence_state = kzalloc(sizeof(*fence_state), GFP_KERNEL);
> +	if (!intel_wd) {
> +		kfree(intel_wd);
> +		kfree(intel_connector);
> +		return;
> +	}
> +
> +	wb_conn = &intel_connector->wb_conn;
> +	wb_conn->base = &intel_connector->base;
> +	wb_conn->encoder = &intel_wd->base.base;
> +
> +	encoder = &intel_wd->base;
> +	intel_wd->attached_connector = intel_connector;
> +	intel_wd->fence_state = fence_state;
> +	intel_wd->trans = trans;
> +	intel_wd->triggered_cap_mode = 1;
> +	intel_wd->frame_num = 1;
> +	intel_wd->slicing_strategy = 1;
> +	encoder->get_config = intel_wd_get_config;
> +	encoder->compute_config = intel_wd_compute_config;
> +	encoder->get_hw_state = intel_wd_get_hw_state;
> +	encoder->type = INTEL_OUTPUT_WD;
> +	encoder->cloneable = 0;
> +	encoder->pipe_mask = ~0;
> +	encoder->power_domain = POWER_DOMAIN_TRANSCODER_B;
> +	encoder->get_power_domains = intel_wd_get_power_domains;
> +	encoder->initial_fastset_check = intel_fastset_dis;
> +	intel_connector->get_hw_state =
> +		intel_connector_get_hw_state;
> +
> +	drm_dbg_kms(&i915->drm, "\n");
> +	err = intel_writeback_connector_init(&i915->drm, wb_conn,
> +		&wd_connector_funcs,
> +		&wd_encoder_helper_funcs,
> +		wb_fmts, n_formats);
> +
> +	if (err != 0) {
> +		drm_dbg_kms(&i915->drm,
> +		"intel_writeback_connector_init: Failed: %d\n",
> +			err);
> +		goto cleanup;
> +	}
> +
> +	drm_connector_helper_add(wb_conn->base,
> &wd_connector_helper_funcs);
> +	intel_connector_attach_encoder(intel_connector, encoder);
> +	wb_conn->base->status = connector_status_connected;
> +	return;
> +
> +cleanup:
> +	kfree(intel_wd);
> +	intel_connector_free(intel_connector);
> +}
> +
> +static void intel_wd_writeback_complete(struct intel_wd *intel_wd,
> +	struct intel_writeback_job *job, int status) {
> +	struct intel_writeback_connector *wb_conn =
> +		&intel_wd->attached_connector->wb_conn;
> +	intel_writeback_signal_completion(wb_conn, status);
> +	intel_wd_complete_signaling(intel_wd);
> +}
> +
> +static int intel_wd_setup_transcoder(struct intel_wd *intel_wd,
> +		struct intel_crtc_state *pipe_config,
> +		struct intel_writeback_job *job)
> +{
> +	struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc);
> +	enum pipe pipe = intel_crtc->pipe;
> +	struct drm_framebuffer *fb;
> +	struct drm_i915_private *dev_priv = to_i915(intel_crtc->base.dev);
> +	struct drm_gem_object *wd_fb_obj;
> +	int ret;
> +	u32 stride, tmp;
> +	u16 hactive, vactive;
> +
> +	fb = job->fb;
> +	wd_fb_obj = fb->obj[0];
> +	if (!wd_fb_obj) {
> +		drm_dbg_kms(&dev_priv->drm, "No framebuffer gem
> object created\n");
> +		return -1;
> +	}
> +	ret = intel_wd_pin_fb(intel_wd, fb);
> +	drm_WARN_ON(&dev_priv->drm, ret != 0);
> +
> +	/*Write stride and surface registers in that particular order*/
> +	stride = intel_wd_get_stride(pipe_config, fb->format->format);
> +
> +	tmp = intel_de_read(dev_priv, WD_STRIDE(intel_wd->trans));
> +	tmp &= ~WD_STRIDE_MASK;
> +	tmp |= (stride << WD_STRIDE_SHIFT);
> +
> +	intel_de_write(dev_priv, WD_STRIDE(intel_wd->trans), tmp);
> +
> +	tmp = intel_de_read(dev_priv, WD_SURF(intel_wd->trans));
> +	drm_dbg_kms(&dev_priv->drm, "%d is the surface address\n",
> tmp);
> +
> +	intel_de_write(dev_priv, WD_SURF(intel_wd->trans),
> +			i915_ggtt_offset(intel_wd->vma));
> +
> +	tmp = intel_de_read_fw(dev_priv, WD_IIR(intel_wd->trans));
> +	intel_de_write_fw(dev_priv, WD_IIR(intel_wd->trans), tmp);
> +
> +	tmp =
> ~(WD_GTT_FAULT_INT|WD_WRITE_COMPLETE_INT|WD_FRAME_COMPLET
> E_INT|
> +
> 	WD_VBLANK_INT|WD_OVERRUN_INT|WD_CAPTURING_INT);
> +	intel_de_write_fw(dev_priv, WD_IMR(intel_wd->trans), tmp);
> +
> +	if (intel_wd->stream_cap) {
> +		tmp = intel_de_read(dev_priv,
> +				WD_STREAMCAP_CTL(intel_wd->trans));
> +		tmp |= WD_STREAM_CAP_MODE_EN;
> +		intel_configure_slicing_strategy(dev_priv, intel_wd, &tmp);
> +	}
> +
> +	hactive = pipe_config->uapi.mode.hdisplay;
> +	vactive = pipe_config->uapi.mode.vdisplay;
> +
> +	drm_dbg_kms(&dev_priv->drm, "hactive : %d, vactive: %d\n",
> hactive,
> +vactive);
> +
> +	tmp = intel_de_read(dev_priv, HTOTAL(intel_wd->trans));
> +	drm_dbg_kms(&dev_priv->drm, "hactive_reg : %d\n", tmp);
> +	tmp = intel_de_read(dev_priv, VTOTAL(intel_wd->trans));
> +	drm_dbg_kms(&dev_priv->drm, "vactive_reg : %d\n", tmp);
> +	/* minimum hactive as per bspec: 64 pixels*/
> +	if (hactive < 64)
> +		drm_err(&dev_priv->drm, "hactive is less then 64 pixels\n");
> +
> +	intel_de_write(dev_priv, HTOTAL(intel_wd->trans), hactive - 1);
> +	intel_de_write(dev_priv, VTOTAL(intel_wd->trans), vactive - 1);
> +
> +	tmp = intel_de_read(dev_priv, WD_TRANS_FUNC_CTL(intel_wd-
> >trans));
> +	/* select pixel format */
> +	tmp &= ~WD_PIX_FMT_MASK;
> +
> +	switch (fb->format->format) {
> +	default:
> +	fallthrough;
> +	case DRM_FORMAT_YUYV:
> +		tmp |= WD_PIX_FMT_YUYV;
> +		break;
> +	case DRM_FORMAT_XYUV8888:
> +		tmp |= WD_PIX_FMT_XYUV8888;
> +		break;
> +	case DRM_FORMAT_XBGR8888:
> +		tmp |= WD_PIX_FMT_XBGR8888;
> +		break;
> +	case DRM_FORMAT_Y410:
> +		tmp |= WD_PIX_FMT_Y410;
> +		break;
> +	case DRM_FORMAT_YUV422:
> +		tmp |= WD_PIX_FMT_YUV422;
> +		break;
> +	case DRM_FORMAT_XBGR2101010:
> +		tmp |= WD_PIX_FMT_XBGR2101010;
> +		break;
> +	case DRM_FORMAT_RGB565:
> +		tmp |= WD_PIX_FMT_RGB565;
> +		break;
> +	}
> +
> +	if (intel_wd->triggered_cap_mode)
> +		tmp |= WD_TRIGGERED_CAP_MODE_ENABLE;
> +
> +	if (intel_wd->stream_cap)
> +		tmp |= WD_CTL_POINTER_DTDH;
> +
> +	/*select input pipe*/
> +	tmp &= ~WD_INPUT_SELECT_MASK;
> +	drm_dbg_kms(&dev_priv->drm, "Selected pipe is %d\n", pipe);
> +	switch (pipe) {
> +	default:
> +		fallthrough;
> +	case PIPE_A:
> +		tmp |= WD_INPUT_PIPE_A;
> +		break;
> +	case PIPE_B:
> +		tmp |= WD_INPUT_PIPE_B;
> +		break;
> +	case PIPE_C:
> +		tmp |= WD_INPUT_PIPE_C;
> +		break;
> +	case PIPE_D:
> +		tmp |= WD_INPUT_PIPE_D;
> +		break;
> +	}
> +
> +	/* enable DDI buffer */
> +	if (!(tmp & TRANS_WD_FUNC_ENABLE))
> +		tmp |= TRANS_WD_FUNC_ENABLE;
> +
> +	intel_de_write(dev_priv, WD_TRANS_FUNC_CTL(intel_wd->trans),
> tmp);
> +
> +	tmp = intel_de_read(dev_priv, PIPECONF(intel_wd->trans));
> +	ret = tmp & WD_TRANS_ACTIVE;
> +	drm_dbg_kms(&dev_priv->drm, "Trancoder enabled: %s\n", ret ?
> +"true":"false");
> +
> +	if (!ret) {
> +		/*enable the transcoder	*/
> +		tmp = intel_de_read(dev_priv, PIPECONF(intel_wd->trans));
> +		tmp |= WD_TRANS_ENABLE;
> +		intel_de_write(dev_priv, PIPECONF(intel_wd->trans), tmp);
> +
> +		/* wait for transcoder to be enabled */
> +		if (intel_de_wait_for_set(dev_priv, PIPECONF(intel_wd-
> >trans),
> +				WD_TRANS_ACTIVE, 10))
> +			drm_err(&dev_priv->drm, "WD transcoder not
> enabled\n");
> +	}
> +
> +	return 0;
> +}
> +
> +static void intel_wd_disable_capture(struct intel_wd *intel_wd) {
> +	struct drm_i915_private *dev_priv = to_i915(intel_wd-
> >base.base.dev);
> +	u32 tmp;
> +
> +	intel_de_write_fw(dev_priv, WD_IMR(intel_wd->trans), 0xFF);
> +	tmp = intel_de_read(dev_priv, PIPECONF(intel_wd->trans));
> +	tmp &= WD_TRANS_DISABLE;
> +	intel_de_write(dev_priv, PIPECONF(intel_wd->trans), tmp);
> +
> +	drm_dbg_kms(&dev_priv->drm, "WD Trans_Conf value after disable
> = 0x%08x\n",
> +		intel_de_read(dev_priv, PIPECONF(intel_wd->trans)));
> +	tmp = intel_de_read(dev_priv, WD_TRANS_FUNC_CTL(intel_wd-
> >trans));
> +	tmp |= ~TRANS_WD_FUNC_ENABLE;
> +}
> +
> +static int intel_wd_capture(struct intel_wd *intel_wd,
> +		struct intel_crtc_state *pipe_config,
> +		struct intel_writeback_job *job)
> +{
> +	u32 tmp;
> +	struct drm_i915_private *i915 = to_i915(intel_wd->base.base.dev);
> +	int ret = 0, status = 0;
> +	struct intel_crtc *wd_crtc = intel_wd->wd_crtc;
> +	unsigned long flags;
> +
> +	drm_dbg_kms(&i915->drm, "\n");
> +
> +	if (!job->out_fence)
> +		drm_dbg_kms(&i915->drm, "Not able to get out_fence for
> job\n");
> +
> +	ret = intel_wd_setup_transcoder(intel_wd, pipe_config, job);
> +
> +	if (ret < 0) {
> +		drm_dbg_kms(&i915->drm,
> +		"wd transcoder setup not completed aborting capture\n");
> +		return -1;
> +	}
> +
> +	if (wd_crtc == NULL) {
> +		DRM_ERROR("CRTC not attached\n");
> +		return -1;
> +	}
> +
> +	tmp = intel_de_read_fw(i915,
> +			WD_TRANS_FUNC_CTL(intel_wd->trans));
> +	tmp |= START_TRIGGER_FRAME;
> +	tmp &= ~WD_FRAME_NUMBER_MASK;
> +	tmp |= intel_wd->frame_num;
> +	intel_de_write_fw(i915,
> +			WD_TRANS_FUNC_CTL(intel_wd->trans), tmp);
> +
> +	if (!intel_de_wait_for_set(i915, WD_IIR(intel_wd->trans),
> +				WD_FRAME_COMPLETE_INT, 100)){
> +		drm_dbg_kms(&i915->drm, "frame captured\n");
> +		tmp = intel_de_read(i915, WD_IIR(intel_wd->trans));
> +		drm_dbg_kms(&i915->drm, "iir value : %d\n", tmp);
> +		status = 0;
> +	} else {
> +		drm_dbg_kms(&i915->drm, "frame not captured triggering
> stop frame\n");
> +		tmp = intel_de_read(i915,
> +				WD_TRANS_FUNC_CTL(intel_wd->trans));
> +		tmp |= STOP_TRIGGER_FRAME;
> +		intel_de_write(i915,
> +				WD_TRANS_FUNC_CTL(intel_wd->trans),
> tmp);
> +		status = -1;
> +	}
> +
> +	intel_de_write(i915, WD_IIR(intel_wd->trans), tmp);
> +	intel_wd_writeback_complete(intel_wd, job, status);
> +	if (intel_get_writeback_job_from_queue(intel_wd) == NULL)
> +		intel_wd_disable_capture(intel_wd);
> +	if (wd_crtc->wd.e) {
> +		spin_lock_irqsave(&i915->drm.event_lock, flags);
> +		drm_dbg_kms(&i915->drm, "send %p\n", wd_crtc->wd.e);
> +		drm_crtc_send_vblank_event(&wd_crtc->base,
> +					wd_crtc->wd.e);
> +		spin_unlock_irqrestore(&i915->drm.event_lock, flags);
> +		wd_crtc->wd.e = NULL;
> +	} else {
> +		DRM_ERROR("Event NULL! %p, %p\n", &i915->drm,
> +			wd_crtc);
> +	}
> +	return 0;
> +
> +}
> +
> +void intel_wd_enable_capture(struct intel_encoder *encoder,
> +		struct intel_crtc_state *pipe_config,
> +		struct drm_connector_state *conn_state) {
> +	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
> +	struct intel_wd *intel_wd = enc_to_intel_wd(encoder);
> +	struct intel_writeback_job *job;
> +
> +	drm_dbg_kms(&i915->drm, "\n");
> +
> +	job = intel_get_writeback_job_from_queue(intel_wd);
> +	if (job == NULL) {
> +		drm_dbg_kms(&i915->drm,
> +			"job queue is empty not capturing any frame\n");
> +		return;
> +	}
> +
> +	intel_wd_capture(intel_wd, pipe_config, job);
> +	intel_wd->frame_num += 1;
> +
> +}
> +
> +void intel_wd_set_vblank_event(struct intel_crtc *intel_crtc,
> +			struct intel_crtc_state *intel_crtc_state) {
> +	struct drm_i915_private *i915 = to_i915(intel_crtc->base.dev);
> +	struct drm_crtc_state *state = &intel_crtc_state->uapi;
> +	struct intel_encoder *encoder;
> +	struct intel_wd *intel_wd;
> +
> +	for_each_intel_encoder_with_wd(&i915->drm, encoder) {
> +		intel_wd = enc_to_intel_wd(encoder);
> +
> +		if (!intel_wd->wd_crtc) {
> +			drm_dbg_kms(&i915->drm, "wd crtc not found\n");
> +			return;
> +		}
> +	}
> +
> +	if (intel_crtc == intel_wd->wd_crtc) {
> +		intel_crtc->wd.e = state->event;
> +		state->event = NULL;
> +		if (intel_crtc->wd.e)
> +			drm_dbg_kms(&i915->drm, "WD event:%p\n",
> +				intel_crtc->wd.e);
> +		else
> +			drm_dbg_kms(&i915->drm, "WD no event\n");
> +	}
> +}
> +
> +void intel_wd_handle_isr(struct drm_i915_private *i915) {
> +	u32 iir_value = 0;
> +	struct intel_encoder *encoder;
> +	struct intel_wd *intel_wd;
> +
> +	iir_value = intel_de_read(i915, WD_IIR(TRANSCODER_WD_0));
> +	drm_dbg_kms(&i915->drm, "\n");
> +
> +	for_each_intel_encoder_with_wd(&i915->drm, encoder) {
> +		intel_wd = enc_to_intel_wd(encoder);
> +
> +		if (!intel_wd->wd_crtc) {
> +			DRM_ERROR("NO CRTC attached with WD\n");
> +			goto clear_iir;
> +		}
> +	}
> +
> +	if (iir_value & WD_VBLANK_INT)
> +		drm_dbg_kms(&i915->drm, "vblank interrupt for wd
> transcoder\n");
> +	if (iir_value & WD_WRITE_COMPLETE_INT)
> +		drm_dbg_kms(&i915->drm,
> +		"wd write complete interrupt encountered\n");
> +	else
> +		DRM_INFO("iir: %x\n", iir_value);
> +	if (iir_value & WD_FRAME_COMPLETE_INT) {
> +		drm_dbg_kms(&i915->drm,
> +			"frame complete interrupt for wd transcoder\n");
> +		return;
> +	}
> +clear_iir:
> +	intel_de_write(i915, WD_IIR(TRANSCODER_WD_0), iir_value); }
> diff --git a/drivers/gpu/drm/i915/display/intel_wd.h
> b/drivers/gpu/drm/i915/display/intel_wd.h
> new file mode 100644
> index 000000000000..2309afa23bb8
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/display/intel_wd.h
> @@ -0,0 +1,82 @@
> +/* SPDX-License-Identifier: GPL-2.0
> + * Copyright © 2021 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person
> +obtaining a
> + * copy of this software and associated documentation files (the
> +"Software"),
> + * to deal in the Software without restriction, including without
> +limitation
> + * the rights to use, copy, modify, merge, publish, distribute,
> +sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom
> +the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the
> +next
> + * paragraph) shall be included in all copies or substantial portions
> +of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> +EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> +MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO
> EVENT
> +SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
> DAMAGES OR
> +OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
> +ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
> OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Author :
> + *	Suraj Kandpal<suraj.kandpal@xxxxxxxxx>
> + *	Arun Murthy<arun.r.murthy@xxxxxxxxx>
> + */
> +
> +#ifndef _INTEL_WD_H
> +#define _INTEL_WD_H
> +
> +#include <drm/drm_crtc.h>
> +#include <linux/sync_file.h>
> +
> +#include "intel_display_types.h"
> +
> +#define I915_MAX_WD_TANSCODERS 2
> +
> +struct intel_out_fence_state {
> +	s32 __user *out_fence_ptr;
> +	struct sync_file *sync_file;
> +	int fd;
> +};
> +
> +struct intel_wd {
> +	struct intel_encoder base;
> +	struct intel_crtc *wd_crtc;
> +	struct intel_out_fence_state *fence_state;
> +	intel_wakeref_t io_wakeref[I915_MAX_WD_TANSCODERS];
> +	struct intel_connector *attached_connector;
> +	enum transcoder trans;
> +	struct i915_vma *vma;
> +	unsigned long flags;
> +	struct intel_writeback_job *job;
> +	int triggered_cap_mode;
> +	int frame_num;
> +	bool stream_cap;
> +	bool start_capture;
> +	int slicing_strategy;
> +};
> +
> +struct intel_wd_clk_vals {
> +	u32 cdclk;
> +	u16 link_m;
> +	u16 link_n;
> +};
> +
> +extern struct sync_file *sync_file_create(struct dma_fence *fence);
> +static inline struct intel_wd *enc_to_intel_wd(struct intel_encoder
> +*encoder) {
> +	return container_of(&encoder->base, struct intel_wd, base.base); }
> +void intel_wd_init(struct drm_i915_private *dev_priv, enum transcoder
> +trans); void intel_wd_enable_capture(struct intel_encoder *encoder,
> +				struct intel_crtc_state *pipe_config,
> +				struct drm_connector_state *conn_state);
> void
> +intel_wd_handle_isr(struct drm_i915_private *dev_priv); void
> +intel_wd_set_vblank_event(struct intel_crtc *crtc,
> +				struct intel_crtc_state *state);
> +int intel_wd_prepare_out_fence(struct drm_device *dev,
> +				struct drm_atomic_state *state);
> +void intel_wd_complete_signaling(struct intel_wd *intel_wd);
> +#endif/* _INTEL_WD_H */
> diff --git a/drivers/gpu/drm/i915/i915_drv.h
> b/drivers/gpu/drm/i915/i915_drv.h index 9a86ee88089e..b7e92a18125c
> 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -38,6 +38,8 @@
>  #include <linux/pm_qos.h>
> 
>  #include <drm/drm_connector.h>
> +#include <drm/drm_writeback.h>
> +#include <drm/i915_mei_hdcp_interface.h>
>  #include <drm/ttm/ttm_device.h>
> 
>  #include "display/intel_bios.h"
> diff --git a/drivers/gpu/drm/i915/i915_irq.c
> b/drivers/gpu/drm/i915/i915_irq.c index 73cebc6aa650..95a6a8f7a911 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -42,6 +42,7 @@
>  #include "display/intel_hotplug.h"
>  #include "display/intel_lpe_audio.h"
>  #include "display/intel_psr.h"
> +#include "display/intel_wd.h"
> 
>  #include "gt/intel_breadcrumbs.h"
>  #include "gt/intel_gt.h"
> @@ -2342,6 +2343,11 @@ gen8_de_misc_irq_handler(struct
> drm_i915_private *dev_priv, u32 iir)
>  		found = true;
>  	}
> 
> +	if (iir & GEN8_DE_MISC_WD0) {
> +		intel_wd_handle_isr(dev_priv);
> +		found = true;
> +	}
> +
>  	if (iir & GEN8_DE_EDP_PSR) {
>  		struct intel_encoder *encoder;
>  		u32 psr_iir;
> @@ -3767,7 +3773,7 @@ static void gen8_de_irq_postinstall(struct
> drm_i915_private *dev_priv)
>  	u32 de_pipe_enables;
>  	u32 de_port_masked = gen8_de_port_aux_mask(dev_priv);
>  	u32 de_port_enables;
> -	u32 de_misc_masked = GEN8_DE_EDP_PSR;
> +	u32 de_misc_masked = GEN8_DE_EDP_PSR | GEN8_DE_MISC_WD0;
>  	u32 trans_mask = BIT(TRANSCODER_A) | BIT(TRANSCODER_B) |
>  		BIT(TRANSCODER_C) | BIT(TRANSCODER_D);
>  	enum pipe pipe;
> diff --git a/drivers/gpu/drm/i915/i915_pci.c
> b/drivers/gpu/drm/i915/i915_pci.c index 67b89769f577..a524e0f030b6
> 100644
> --- a/drivers/gpu/drm/i915/i915_pci.c
> +++ b/drivers/gpu/drm/i915/i915_pci.c
> @@ -853,7 +853,8 @@ static const struct intel_device_info jsl_info = {
>  	.display.pipe_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C) |
> BIT(PIPE_D), \
>  	.display.cpu_transcoder_mask = BIT(TRANSCODER_A) |
> BIT(TRANSCODER_B) | \
>  		BIT(TRANSCODER_C) | BIT(TRANSCODER_D) | \
> -		BIT(TRANSCODER_DSI_0) | BIT(TRANSCODER_DSI_1), \
> +		BIT(TRANSCODER_DSI_0) | BIT(TRANSCODER_DSI_1)| \
> +		BIT(TRANSCODER_WD_0), \
>  	.pipe_offsets = { \
>  		[TRANSCODER_A] = PIPE_A_OFFSET, \
>  		[TRANSCODER_B] = PIPE_B_OFFSET, \
> @@ -861,6 +862,8 @@ static const struct intel_device_info jsl_info = {
>  		[TRANSCODER_D] = PIPE_D_OFFSET, \
>  		[TRANSCODER_DSI_0] = PIPE_DSI0_OFFSET, \
>  		[TRANSCODER_DSI_1] = PIPE_DSI1_OFFSET, \
> +		[TRANSCODER_WD_0] = PIPE_WD0_OFFSET, \
> +		[TRANSCODER_WD_1] = PIPE_WD1_OFFSET, \
>  	}, \
>  	.trans_offsets = { \
>  		[TRANSCODER_A] = TRANSCODER_A_OFFSET, \ @@ -869,6
> +872,8 @@ static const struct intel_device_info jsl_info = {
>  		[TRANSCODER_D] = TRANSCODER_D_OFFSET, \
>  		[TRANSCODER_DSI_0] = TRANSCODER_DSI0_OFFSET, \
>  		[TRANSCODER_DSI_1] = TRANSCODER_DSI1_OFFSET, \
> +		[TRANSCODER_WD_0] = TRANSCODER_WD0_OFFSET, \
> +		[TRANSCODER_WD_1] = TRANSCODER_WD1_OFFSET, \
>  	}, \
>  	TGL_CURSOR_OFFSETS, \
>  	.has_global_mocs = 1, \
> diff --git a/drivers/gpu/drm/i915/i915_reg.h
> b/drivers/gpu/drm/i915/i915_reg.h index 6396afd77209..abc41e7de0b5
> 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -3797,6 +3797,11 @@
>  #define PIPE_DSI0_OFFSET	0x7b000
>  #define PIPE_DSI1_OFFSET	0x7b800
> 
> +/* WD 0 and 1 */
> +#define PIPE_WD0_OFFSET		0x7e000
> +#define PIPE_WD1_OFFSET		0x7d000
> +
> +
>  #define PIPECONF(pipe)		_MMIO_PIPE2(pipe, _PIPEACONF)
>  #define PIPEDSL(pipe)		_MMIO_PIPE2(pipe, _PIPEADSL)
>  #define PIPEFRAME(pipe)		_MMIO_PIPE2(pipe,
> _PIPEAFRAMEHIGH)
> @@ -4461,6 +4466,10 @@
>  #define _PIPEDSI0CONF		0x7b008
>  #define _PIPEDSI1CONF		0x7b808
> 
> +/* WD 0 and 1 */
> +#define _PIPEWD0CONF		0x7e008
> +#define _PIPEWD1CONF		0x7d008
> +
>  /* Sprite A control */
>  #define _DVSACNTR		0x72180
>  #define   DVS_ENABLE			REG_BIT(31)
> @@ -5707,6 +5716,7 @@
>  #define GEN8_DE_MISC_IER _MMIO(0x4446c)
>  #define  GEN8_DE_MISC_GSE		(1 << 27)
>  #define  GEN8_DE_EDP_PSR		(1 << 19)
> +#define  GEN8_DE_MISC_WD0		(1 << 23)
> 
>  #define GEN8_PCU_ISR _MMIO(0x444e0)
>  #define GEN8_PCU_IMR _MMIO(0x444e4)
> @@ -8847,6 +8857,133 @@ enum skl_power_gate {
>  #define   DSB_ENABLE			(1 << 31)
>  #define   DSB_STATUS			(1 << 0)
> 
> +#define TGL_ROOT_DEVICE_ID		0x9A00
> +#define TGL_ROOT_DEVICE_MASK		0xFF00
> +#define TGL_ROOT_DEVICE_SKU_MASK	0xF
> +#define TGL_ROOT_DEVICE_SKU_ULX		0x2
> +#define TGL_ROOT_DEVICE_SKU_ULT		0x4
> +
> +/* Gen12 WD */
> +#define _MMIO_WD(tc, wd0, wd1)		_MMIO_TRANS((tc) -
> TRANSCODER_WD_0, \
> +							wd0, wd1)
> +
> +#define WD_TRANS_ENABLE			(1 << 31)
> +#define WD_TRANS_DISABLE		0
> +#define WD_TRANS_ACTIVE			(1 << 30)
> +
> +/* WD transcoder control */
> +#define _WD_TRANS_FUNC_CTL_0		0x6e400
> +#define _WD_TRANS_FUNC_CTL_1		0x6ec00
> +#define WD_TRANS_FUNC_CTL(tc)		_MMIO_WD(tc,\
> +					_WD_TRANS_FUNC_CTL_0,\
> +					_WD_TRANS_FUNC_CTL_1)
> +
> +#define TRANS_WD_FUNC_ENABLE		(1 << 31)
> +#define WD_TRIGGERED_CAP_MODE_ENABLE	(1 << 30)
> +#define START_TRIGGER_FRAME		(1 << 29)
> +#define STOP_TRIGGER_FRAME		(1 << 28)
> +#define WD_CTL_POINTER_ETEH		(0 << 18)
> +#define WD_CTL_POINTER_ETDH		(1 << 18)
> +#define WD_CTL_POINTER_DTDH		(2 << 18)
> +#define WD_INPUT_SELECT_MASK		(7 << 12)
> +#define WD_INPUT_PIPE_A			(0 << 12)
> +#define WD_INPUT_PIPE_B			(5 << 12)
> +#define WD_INPUT_PIPE_C			(6 << 12)
> +#define WD_INPUT_PIPE_D			(7 << 12)
> +
> +#define WD_PIX_FMT_MASK			(0x3 << 20)
> +#define WD_PIX_FMT_YUYV			(0x1 << 20)
> +#define WD_PIX_FMT_XYUV8888		(0x2 << 20)
> +#define WD_PIX_FMT_XBGR8888		(0x3 << 20)
> +#define WD_PIX_FMT_Y410			(0x4 << 20)
> +#define WD_PIX_FMT_YUV422		(0x5 << 20)
> +#define WD_PIX_FMT_XBGR2101010		(0x6 << 20)
> +#define WD_PIX_FMT_RGB565		(0x7 << 20)
> +
> +#define WD_FRAME_NUMBER_MASK		15
> +
> +#define _WD_STRIDE_0			0x6e510
> +#define _WD_STRIDE_1			0x6ed10
> +#define WD_STRIDE(tc)			_MMIO_WD(tc,\
> +					_WD_STRIDE_0,\
> +					_WD_STRIDE_1)
> +#define WD_STRIDE_SHIFT			6
> +#define WD_STRIDE_MASK			(0x3ff << WD_STRIDE_SHIFT)
> +
> +#define _WD_STREAMCAP_CTL0		0x6e590
> +#define _WD_STREAMCAP_CTL1		0x6ed90
> +#define WD_STREAMCAP_CTL(tc)		_MMIO_WD(tc,\
> +					_WD_STREAMCAP_CTL0,\
> +					_WD_STREAMCAP_CTL1)
> +
> +#define WD_STREAM_CAP_MODE_EN		(1 << 31)
> +#define WD_STRAT_MASK			(3 << 24)
> +#define WD_SLICING_STRAT_1_1		(0 << 24)
> +#define WD_SLICING_STRAT_2_1		(1 << 24)
> +#define WD_SLICING_STRAT_4_1		(2 << 24)
> +#define WD_SLICING_STRAT_8_1		(3 << 24)
> +#define WD_STREAM_OVERRUN_STATUS	1
> +
> +#define _WD_SURF_0			0x6e514
> +#define _WD_SURF_1			0x6ed14
> +#define WD_SURF(tc)			_MMIO_WD(tc,\
> +					_WD_SURF_0,\
> +					_WD_SURF_1)
> +
> +#define _WD_IMR_0			0x6e560
> +#define _WD_IMR_1			0x6ed60
> +#define WD_IMR(tc)			_MMIO_WD(tc,\
> +					_WD_IMR_0,\
> +					_WD_IMR_1)
> +#define WD_FRAME_COMPLETE_INT		(1 << 7)
> +#define WD_GTT_FAULT_INT		(1 << 6)
> +#define WD_VBLANK_INT			(1 << 5)
> +#define WD_OVERRUN_INT			(1 << 4)
> +#define WD_CAPTURING_INT		(1 << 3)
> +#define WD_WRITE_COMPLETE_INT		(1 << 2)
> +
> +#define _WD_IIR_0			0x6e564
> +#define _WD_IIR_1			0x6ed64
> +#define WD_IIR(tc)			_MMIO_WD(tc,\
> +					_WD_IIR_0,\
> +					_WD_IIR_1)
> +
> +#define _WD_FRAME_STATUS_0		0x6e56b
> +#define _WD_FRAME_STATUS_1		0x6ed6b
> +#define WD_FRAME_STATUS(tc)		_MMIO_WD(tc,\
> +					_WD_FRAME_STATUS_0,\
> +					_WD_FRAME_STATUS_1)
> +
> +#define WD_FRAME_COMPLETE		(1 << 31)
> +#define WD_STATE_IDLE			(0 << 24)
> +#define WD_STATE_CAPSTART		(1 << 24)
> +#define WD_STATE_FRAME_START		(2 << 24)
> +#define WD_STATE_CAPACITIVE		(3 << 24)
> +#define WD_STATE_TG_DONE		(4 << 24)
> +#define WD_STATE_WDX_DONE		(5 << 24)
> +#define WD_STATE_QUICK_CAP		(6 << 24)
> +
> +#define _WD_27_M_0			0x6e524
> +#define _WD_27_M_1			0x6ed24
> +#define WD_27_M(tc)			_MMIO_WD(tc,\
> +					_WD_27_M_0,\
> +					_WD_27_M_1)
> +
> +#define _WD_27_N_0			0x6e528
> +
> +//Address looks wrong in bspec:
> +#define _WD_27_N_1			0x6ec28
> +#define WD_27_N(tc)			_MMIO_WD(tc,\
> +					_WD_27_N_0,\
> +					_WD_27_N_1)
> +
> +#define _WD_TAIL_CFG_0			0x6e520
> +#define _WD_TAIL_CFG_1			0x6ed20
> +
> +#define WD_TAIL_CFG(tc)			_MMIO_WD(tc,\
> +					_WD_TAIL_CFG_0,\
> +					_WD_TAIL_CFG_1)
> +
>  #define CLKREQ_POLICY			_MMIO(0x101038)
>  #define  CLKREQ_POLICY_MEM_UP_OVRD	REG_BIT(1)
> 
> --
> 2.35.1





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