From: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
This defines all the DSC parameters as per the VESA DSC spec
that will be required for DSC encoder/decoder
v2: Define this struct in DRM (From Manasi)
* Changed the data types to u8/u16 instead of unsigned longs (Manasi)
* Remove driver specific fields (Manasi)
* Move this struct definition to DRM (Manasi)
* Define DSC 1.2 parameters (Manasi)
* Use DSC_NUM_BUF_RANGES (Manasi)
* Call it drm_dsc_config (Manasi)
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Signed-off-by: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
---
include/drm/drm_dsc.h | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 111 insertions(+)
diff --git a/include/drm/drm_dsc.h b/include/drm/drm_dsc.h
index 5ee72e8..04501e2 100644
--- a/include/drm/drm_dsc.h
+++ b/include/drm/drm_dsc.h
@@ -30,6 +30,117 @@
#define DSC_NUM_BUF_RANGES 15
+/* VESA Display Stream Compression DSC 1.2 constants */
+#define DSC_NUM_BUF_RANGES 15
+
+/* Configuration for a single Rate Control model range */
+struct dsc_rc_range_parameters {
+ /* Min Quantization Parameters allowed for this range */
+ u8 range_min_qp;
+ /* Max Quantization Parameters allowed for this range */
+ u8 range_max_qp;
+ /* Bits/group offset to apply to target for this group */
+ u8 range_bpg_offset;
+};
+
+struct drm_dsc_config {
+ /* Bits / component for previous reconstructed line buffer */
+ u8 line_buf_depth;
+ /* Bits per component to code (must be 8, 10, or 12) */
+ u8 bits_per_component;
+ /*
+ * Flag indicating to do RGB - YCoCg conversion
+ * and back (should be 1 for RGB input)
+ */
+ bool convert_rgb;
+ u8 slice_count;
+ /* Slice Width */
+ u16 slice_width;
+ /* Slice Height */
+ u16 slice_height;
+ /*
+ * 4:2:2 enable mode (from PPS, 4:2:2 conversion happens
+ * outside of DSC encode/decode algorithm)
+ */
+ bool enable422;
+ /* Picture Width */
+ u16 pic_width;
+ /* Picture Height */
+ u16 pic_height;
+ /* Offset to bits/group used by RC to determine QP adjustment */
+ u8 rc_tgt_offset_high;
+ /* Offset to bits/group used by RC to determine QP adjustment */
+ u8 rc_tgt_offset_low;
+ /* Bits/pixel target << 4 (ie., 4 fractional bits) */
+ u16 bits_per_pixel;
+ /*
+ * Factor to determine if an edge is present based
+ * on the bits produced
+ */
+ u8 rc_edge_factor;
+ /* Slow down incrementing once the range reaches this value */
+ u8 rc_quant_incr_limit1;
+ /* Slow down incrementing once the range reaches this value */
+ u8 rc_quant_incr_limit0;
+ /* Number of pixels to delay the initial transmission */
+ u16 initial_xmit_delay;
+ /* Number of pixels to delay the VLD on the decoder,not including SSM */
+ u16 initial_dec_delay;
+ /* Block prediction enable */
+ bool block_pred_enable;
+ /* Bits/group offset to use for first line of the slice */
+ u8 first_line_bpg_offset;
+ /* Value to use for RC model offset at slice start */
+ u16 initial_offset;
+ /* Thresholds defining each of the buffer ranges */
+ u16 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
+ /* Parameters for each of the RC ranges */
+ struct dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
+ /* Total size of RC model */
+ u16 rc_model_size;
+ /* Minimum QP where flatness information is sent */
+ u8 flatness_min_qp;
+ /* Maximum QP where flatness information is sent */
+ u8 flatness_max_qp;
+ /* Initial value for scale factor */
+ u8 initial_scale_value;
+ /* Decrement scale factor every scale_decrement_interval groups */
+ u16 scale_decrement_interval;
+ /* Increment scale factor every scale_increment_interval groups */
+ u16 scale_increment_interval;
+ /* Non-first line BPG offset to use */
+ u16 nfl_bpg_offset;
+ /* BPG offset used to enforce slice bit */
+ u16 slice_bpg_offset;
+ /* Final RC linear transformation offset value */
+ u16 final_offset;
+ /* Enable on-off VBR (ie., disable stuffing bits) */
+ bool vbr_enable;
+ /* Mux word size (in bits) for SSM mode */
+ u8 mux_word_size;
+ /*
+ * The (max) size in bytes of the "chunks" that are
+ * used in slice multiplexing
+ */
+ u16 slice_chunk_size;
+ /* Rate Control buffer siz in bits */
+ u16 rc_bits;
+ /* DSC Minor Version */
+ u8 dsc_version_minor;
+ /* DSC Major version */
+ u8 dsc_version_major;
+ /* Native 4:2:2 support */
+ bool native_422;
+ /* Native 4:2:0 support */
+ bool native_420;
+ /* Additional bits/grp for seconnd line of slice for native 4:2:0 */
+ u8 second_line_bpg_offset;
+ /* Num of bits deallocated for each grp that is not in second line of slice */
+ u16 nsl_bpg_offset;
+ /* Offset adj fr second line in Native 4:2:0 mode */
+ u16 second_line_offset_adj;
+};
+
/**
* struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
*
--
2.7.4
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