drm/dsc: Define Display Stream Compression PPS infoframe (7c247c06) · Commits · 戴 / test

include/drm/drm_dsc.h

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		/* SPDX-License-Identifier: MIT
		* Copyright (C) 2018 Intel Corp.
		*
		* Authors:
		* Manasi Navare <manasi.d.navare@intel.com>
		*/

		#ifndef DRM_DSC_H_
		#define DRM_DSC_H_

		#include <drm/drm_dp_helper.h>

		/* VESA Display Stream Compression DSC 1.2 constants */
		#define DSC_NUM_BUF_RANGES 15

		/**
		* struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set
		*
		* The VESA DSC standard defines picture parameter set (PPS) which display
		* stream compression encoders must communicate to decoders.
		* The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in
		* this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2.
		* The PPS fields that span over more than a byte should be stored in Big Endian
		* format.
		*/
		struct drm_dsc_picture_parameter_set {
		/**
		* @dsc_version:
		* PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC
		* PPS0[7:4] - dsc_version_major: Contains major version of DSC
		*/
		u8 dsc_version;
		/**
		* @pps_identifier:
		* PPS1[7:0] - Application specific identifier that can be
		* used to differentiate between different PPS tables.
		*/
		u8 pps_identifier;
		/**
		* @pps_reserved:
		* PPS2[7:0]- RESERVED Byte
		*/
		u8 pps_reserved;
		/**
		* @pps_3:
		* PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to
		* generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits,
		* 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits,
		* 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2.
		* PPS3[7:4] - bits_per_component: Bits per component for the original
		* pixels of the encoded picture.
		* 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2)
		* 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also
		* allowed only when dsc_minor_version = 0x2)
		*/
		u8 pps_3;
		/**
		* @pps_4:
		* PPS4[1:0] -These are the most significant 2 bits of
		* compressed BPP bits_per_pixel[9:0] syntax element.
		* PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled
		* PPS4[3] - simple_422: Indicates if decoder drops samples to
		* reconstruct the 4:2:2 picture.
		* PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is
		* active.
		* PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any
		* groups in picture
		* PPS4[7:6] - Reseved bits
		*/
		u8 pps_4;
		/**
		* @bits_per_pixel_low:
		* PPS5[7:0] - This indicates the lower significant 8 bits of
		* the compressed BPP bits_per_pixel[9:0] element.
		*/
		u8 bits_per_pixel_low;
		/**
		* @pic_height:
		* PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows
		* within the raster.
		*/
		__be16 pic_height;
		/**
		* @pic_width:
		* PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within
		* the raster.
		*/
		__be16 pic_width;
		/**
		* @slice_height:
		* PPS10[7:0], PPS11[7:0] - Slice height in units of pixels.
		*/
		__be16 slice_height;
		/**
		* @slice_width:
		* PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels.
		*/
		__be16 slice_width;
		/**
		* @chunk_size:
		* PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks
		* that are used for slice multiplexing.
		*/
		__be16 chunk_size;
		/**
		* @initial_xmit_delay_high:
		* PPS16[1:0] - Most Significant two bits of initial transmission delay.
		* It specifies the number of pixel times that the encoder waits before
		* transmitting data from its rate buffer.
		* PPS16[7:2] - Reserved
		*/
		u8 initial_xmit_delay_high;
		/**
		* @initial_xmit_delay_low:
		* PPS17[7:0] - Least significant 8 bits of initial transmission delay.
		*/
		u8 initial_xmit_delay_low;
		/**
		* @initial_dec_delay:
		*
		* PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number
		* of pixel times that the decoder accumulates data in its rate buffer
		* before starting to decode and output pixels.
		*/
		__be16 initial_dec_delay;
		/**
		* @pps20_reserved:
		*
		* PPS20[7:0] - Reserved
		*/
		u8 pps20_reserved;
		/**
		* @initial_scale_value:
		* PPS21[5:0] - Initial rcXformScale factor used at beginning
		* of a slice.
		* PPS21[7:6] - Reserved
		*/
		u8 initial_scale_value;
		/**
		* @scale_increment_interval:
		* PPS22[7:0], PPS23[7:0] - Number of group times between incrementing
		* the rcXformScale factor at end of a slice.
		*/
		__be16 scale_increment_interval;
		/**
		* @scale_decrement_interval_high:
		* PPS24[3:0] - Higher 4 bits indicating number of group times between
		* decrementing the rcXformScale factor at beginning of a slice.
		* PPS24[7:4] - Reserved
		*/
		u8 scale_decrement_interval_high;
		/**
		* @scale_decrement_interval_low:
		* PPS25[7:0] - Lower 8 bits of scale decrement interval
		*/
		u8 scale_decrement_interval_low;
		/**
		* @pps26_reserved:
		* PPS26[7:0]
		*/
		u8 pps26_reserved;
		/**
		* @first_line_bpg_offset:
		* PPS27[4:0] - Number of additional bits that are allocated
		* for each group on first line of a slice.
		* PPS27[7:5] - Reserved
		*/
		u8 first_line_bpg_offset;
		/**
		* @nfl_bpg_offset:
		* PPS28[7:0], PPS29[7:0] - Number of bits including frac bits
		* deallocated for each group for groups after the first line of slice.
		*/
		__be16 nfl_bpg_offset;
		/**
		* @slice_bpg_offset:
		* PPS30, PPS31[7:0] - Number of bits that are deallocated for each
		* group to enforce the slice constraint.
		*/
		__be16 slice_bpg_offset;
		/**
		* @initial_offset:
		* PPS32,33[7:0] - Initial value for rcXformOffset
		*/
		__be16 initial_offset;
		/**
		* @final_offset:
		* PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset
		*/
		__be16 final_offset;
		/**
		* @flatness_min_qp:
		* PPS36[4:0] - Minimum QP at which flatness is signaled and
		* flatness QP adjustment is made.
		* PPS36[7:5] - Reserved
		*/
		u8 flatness_min_qp;
		/**
		* @flatness_max_qp:
		* PPS37[4:0] - Max QP at which flatness is signalled and
		* the flatness adjustment is made.
		* PPS37[7:5] - Reserved
		*/
		u8 flatness_max_qp;
		/**
		* @rc_model_size:
		* PPS38,39[7:0] - Number of bits within RC Model.
		*/
		__be16 rc_model_size;
		/**
		* @rc_edge_factor:
		* PPS40[3:0] - Ratio of current activity vs, previous
		* activity to determine presence of edge.
		* PPS40[7:4] - Reserved
		*/
		u8 rc_edge_factor;
		/**
		* @rc_quant_incr_limit0:
		* PPS41[4:0] - QP threshold used in short term RC
		* PPS41[7:5] - Reserved
		*/
		u8 rc_quant_incr_limit0;
		/**
		* @rc_quant_incr_limit1:
		* PPS42[4:0] - QP threshold used in short term RC
		* PPS42[7:5] - Reserved
		*/
		u8 rc_quant_incr_limit1;
		/**
		* @rc_tgt_offset:
		* PPS43[3:0] - Lower end of the variability range around the target
		* bits per group that is allowed by short term RC.
		* PPS43[7:4]- Upper end of the variability range around the target
		* bits per group that i allowed by short term rc.
		*/
		u8 rc_tgt_offset;
		/**
		* @rc_buf_thresh:
		* PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for
		* the 15 ranges defined by 14 thresholds.
		*/
		u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1];
		/**
		* @rc_range_parameters:
		* PPS58[7:0] - PPS87[7:0]
		* Parameters that correspond to each of the 15 ranges.
		*/
		__be16 rc_range_parameters[DSC_NUM_BUF_RANGES];
		/**
		* @native_422_420:
		* PPS88[0] - 0 = Native 4:2:2 not used
		* 1 = Native 4:2:2 used
		* PPS88[1] - 0 = Native 4:2:0 not use
		* 1 = Native 4:2:0 used
		* PPS88[7:2] - Reserved 6 bits
		*/
		u8 native_422_420;
		/**
		* @second_line_bpg_offset:
		* PPS89[4:0] - Additional bits/group budget for the
		* second line of a slice in Native 4:2:0 mode.
		* Set to 0 if DSC minor version is 1 or native420 is 0.
		* PPS89[7:5] - Reserved
		*/
		u8 second_line_bpg_offset;
		/**
		* @nsl_bpg_offset:
		* PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated
		* for each group that is not in the second line of a slice.
		*/
		__be16 nsl_bpg_offset;
		/**
		* @second_line_offset_adj:
		* PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second
		* line in Native 4:2:0 mode.
		*/
		__be16 second_line_offset_adj;
		/**
		* @pps_long_94_reserved:
		* PPS 94, 95, 96, 97 - Reserved
		*/
		u32 pps_long_94_reserved;
		/**
		* @pps_long_98_reserved:
		* PPS 98, 99, 100, 101 - Reserved
		*/
		u32 pps_long_98_reserved;
		/**
		* @pps_long_102_reserved:
		* PPS 102, 103, 104, 105 - Reserved
		*/
		u32 pps_long_102_reserved;
		/**
		* @pps_long_106_reserved:
		* PPS 106, 107, 108, 109 - reserved
		*/
		u32 pps_long_106_reserved;
		/**
		* @pps_long_110_reserved:
		* PPS 110, 111, 112, 113 - reserved
		*/
		u32 pps_long_110_reserved;
		/**
		* @pps_long_114_reserved:
		* PPS 114 - 117 - reserved
		*/
		u32 pps_long_114_reserved;
		/**
		* @pps_long_118_reserved:
		* PPS 118 - 121 - reserved
		*/
		u32 pps_long_118_reserved;
		/**
		* @pps_long_122_reserved:
		* PPS 122- 125 - reserved
		*/
		u32 pps_long_122_reserved;
		/**
		* @pps_short_126_reserved:
		* PPS 126, 127 - reserved
		*/
		__be16 pps_short_126_reserved;
		} __packed;

		/**
		* struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter
		* Set Metadata
		*
		* This structure represents the DSC PPS infoframe required to send the Picture
		* Parameter Set metadata required before enabling VESA Display Stream
		* Compression. This is based on the DP Secondary Data Packet structure and
		* comprises of SDP Header as defined in drm_dp_helper.h and PPS payload.
		*
		* @pps_header: Header for PPS as per DP SDP header format
		* @pps_payload: PPS payload fields as per DSC specification Table 4-1
		*/
		struct drm_dsc_pps_infoframe {
		struct dp_sdp_header pps_header;
		struct drm_dsc_picture_parameter_set pps_payload;
		} __packed;

		#endif /* _DRM_DSC_H_ */

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