Edit File: 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_ */