include/drm/drm_dsc.h - linux - Git at Google

 /* 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
 #define DSC_MUX_WORD_SIZE_8_10_BPC		48
 #define DSC_MUX_WORD_SIZE_12_BPC		64
 #define DSC_RC_PIXELS_PER_GROUP			3
 #define DSC_SCALE_DECREMENT_INTERVAL_MAX	4095
 #define DSC_RANGE_BPG_OFFSET_MASK		0x3f

 /* DSC Rate Control Constants */
 #define DSC_RC_MODEL_SIZE_CONST		    8192
 #define DSC_RC_EDGE_FACTOR_CONST	    6
 #define DSC_RC_TGT_OFFSET_HI_CONST	    3
 #define DSC_RC_TGT_OFFSET_LO_CONST	    3

 /* DSC PPS constants and macros */
 #define DSC_PPS_VERSION_MAJOR_SHIFT		4
 #define DSC_PPS_BPC_SHIFT			4
 #define DSC_PPS_MSB_SHIFT			8
 #define DSC_PPS_LSB_MASK			(0xFF << 0)
 #define DSC_PPS_BPP_HIGH_MASK			(0x3 << 8)
 #define DSC_PPS_VBR_EN_SHIFT			2
 #define DSC_PPS_SIMPLE422_SHIFT			3
 #define DSC_PPS_CONVERT_RGB_SHIFT		4
 #define DSC_PPS_BLOCK_PRED_EN_SHIFT		5
 #define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK	(0x3 << 8)
 #define DSC_PPS_SCALE_DEC_INT_HIGH_MASK		(0xF << 8)
 #define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT		4
 #define DSC_PPS_RC_RANGE_MINQP_SHIFT		11
 #define DSC_PPS_RC_RANGE_MAXQP_SHIFT		6
 #define DSC_PPS_NATIVE_420_SHIFT		1
 #define DSC_1_2_MAX_LINEBUF_DEPTH_BITS		16
 #define DSC_1_2_MAX_LINEBUF_DEPTH_VAL		0
 #define DSC_1_1_MAX_LINEBUF_DEPTH_BITS		13

 /* Configuration for a single Rate Control model range */
 struct drm_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 drm_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
  *
  * 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;

 void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp);
 void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
 				const struct drm_dsc_config *dsc_cfg);

 #endif /* _DRM_DSC_H_ */
	/* 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
	#define DSC_MUX_WORD_SIZE_8_10_BPC 48
	#define DSC_MUX_WORD_SIZE_12_BPC 64
	#define DSC_RC_PIXELS_PER_GROUP 3
	#define DSC_SCALE_DECREMENT_INTERVAL_MAX 4095
	#define DSC_RANGE_BPG_OFFSET_MASK 0x3f

	/* DSC Rate Control Constants */
	#define DSC_RC_MODEL_SIZE_CONST 8192
	#define DSC_RC_EDGE_FACTOR_CONST 6
	#define DSC_RC_TGT_OFFSET_HI_CONST 3
	#define DSC_RC_TGT_OFFSET_LO_CONST 3

	/* DSC PPS constants and macros */
	#define DSC_PPS_VERSION_MAJOR_SHIFT 4
	#define DSC_PPS_BPC_SHIFT 4
	#define DSC_PPS_MSB_SHIFT 8
	#define DSC_PPS_LSB_MASK (0xFF << 0)
	#define DSC_PPS_BPP_HIGH_MASK (0x3 << 8)
	#define DSC_PPS_VBR_EN_SHIFT 2
	#define DSC_PPS_SIMPLE422_SHIFT 3
	#define DSC_PPS_CONVERT_RGB_SHIFT 4
	#define DSC_PPS_BLOCK_PRED_EN_SHIFT 5
	#define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK (0x3 << 8)
	#define DSC_PPS_SCALE_DEC_INT_HIGH_MASK (0xF << 8)
	#define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT 4
	#define DSC_PPS_RC_RANGE_MINQP_SHIFT 11
	#define DSC_PPS_RC_RANGE_MAXQP_SHIFT 6
	#define DSC_PPS_NATIVE_420_SHIFT 1
	#define DSC_1_2_MAX_LINEBUF_DEPTH_BITS 16
	#define DSC_1_2_MAX_LINEBUF_DEPTH_VAL 0
	#define DSC_1_1_MAX_LINEBUF_DEPTH_BITS 13

	/* Configuration for a single Rate Control model range */
	struct drm_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 drm_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
	*
	* 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;

	void drm_dsc_dp_pps_header_init(struct drm_dsc_pps_infoframe *pps_sdp);
	void drm_dsc_pps_infoframe_pack(struct drm_dsc_pps_infoframe *pps_sdp,
	const struct drm_dsc_config *dsc_cfg);

	#endif /* _DRM_DSC_H_ */