1 /* SPDX-License-Identifier: MIT 2 * Copyright (C) 2018 Intel Corp. 3 * 4 * Authors: 5 * Manasi Navare <manasi.d.navare@intel.com> 6 */ 7 8 #ifndef DRM_DSC_H_ 9 #define DRM_DSC_H_ 10 11 #include <drm/drm_dp_helper.h> 12 13 /* VESA Display Stream Compression DSC 1.2 constants */ 14 #define DSC_NUM_BUF_RANGES 15 15 #define DSC_MUX_WORD_SIZE_8_10_BPC 48 16 #define DSC_MUX_WORD_SIZE_12_BPC 64 17 #define DSC_RC_PIXELS_PER_GROUP 3 18 #define DSC_SCALE_DECREMENT_INTERVAL_MAX 4095 19 #define DSC_RANGE_BPG_OFFSET_MASK 0x3f 20 21 /* DSC Rate Control Constants */ 22 #define DSC_RC_MODEL_SIZE_CONST 8192 23 #define DSC_RC_EDGE_FACTOR_CONST 6 24 #define DSC_RC_TGT_OFFSET_HI_CONST 3 25 #define DSC_RC_TGT_OFFSET_LO_CONST 3 26 27 /* DSC PPS constants and macros */ 28 #define DSC_PPS_VERSION_MAJOR_SHIFT 4 29 #define DSC_PPS_BPC_SHIFT 4 30 #define DSC_PPS_MSB_SHIFT 8 31 #define DSC_PPS_LSB_MASK (0xFF << 0) 32 #define DSC_PPS_BPP_HIGH_MASK (0x3 << 8) 33 #define DSC_PPS_VBR_EN_SHIFT 2 34 #define DSC_PPS_SIMPLE422_SHIFT 3 35 #define DSC_PPS_CONVERT_RGB_SHIFT 4 36 #define DSC_PPS_BLOCK_PRED_EN_SHIFT 5 37 #define DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK (0x3 << 8) 38 #define DSC_PPS_SCALE_DEC_INT_HIGH_MASK (0xF << 8) 39 #define DSC_PPS_RC_TGT_OFFSET_HI_SHIFT 4 40 #define DSC_PPS_RC_RANGE_MINQP_SHIFT 11 41 #define DSC_PPS_RC_RANGE_MAXQP_SHIFT 6 42 #define DSC_PPS_NATIVE_420_SHIFT 1 43 #define DSC_1_2_MAX_LINEBUF_DEPTH_BITS 16 44 #define DSC_1_2_MAX_LINEBUF_DEPTH_VAL 0 45 #define DSC_1_1_MAX_LINEBUF_DEPTH_BITS 13 46 47 /** 48 * struct drm_dsc_rc_range_parameters - DSC Rate Control range parameters 49 * 50 * This defines different rate control parameters used by the DSC engine 51 * to compress the frame. 52 */ 53 struct drm_dsc_rc_range_parameters { 54 /** 55 * @range_min_qp: Min Quantization Parameters allowed for this range 56 */ 57 u8 range_min_qp; 58 /** 59 * @range_max_qp: Max Quantization Parameters allowed for this range 60 */ 61 u8 range_max_qp; 62 /** 63 * @range_bpg_offset: 64 * Bits/group offset to apply to target for this group 65 */ 66 u8 range_bpg_offset; 67 }; 68 69 /** 70 * struct drm_dsc_config - Parameters required to configure DSC 71 * 72 * Driver populates this structure with all the parameters required 73 * to configure the display stream compression on the source. 74 */ 75 struct drm_dsc_config { 76 /** 77 * @line_buf_depth: 78 * Bits per component for previous reconstructed line buffer 79 */ 80 u8 line_buf_depth; 81 /** 82 * @bits_per_component: Bits per component to code (8/10/12) 83 */ 84 u8 bits_per_component; 85 /** 86 * @convert_rgb: 87 * Flag to indicate if RGB - YCoCg conversion is needed 88 * True if RGB input, False if YCoCg input 89 */ 90 bool convert_rgb; 91 /** 92 * @slice_count: Number fo slices per line used by the DSC encoder 93 */ 94 u8 slice_count; 95 /** 96 * @slice_width: Width of each slice in pixels 97 */ 98 u16 slice_width; 99 /** 100 * @slice_height: Slice height in pixels 101 */ 102 u16 slice_height; 103 /** 104 * @simple_422: True if simple 4_2_2 mode is enabled else False 105 */ 106 bool simple_422; 107 /** 108 * @pic_width: Width of the input display frame in pixels 109 */ 110 u16 pic_width; 111 /** 112 * @pic_height: Vertical height of the input display frame 113 */ 114 u16 pic_height; 115 /** 116 * @rc_tgt_offset_high: 117 * Offset to bits/group used by RC to determine QP adjustment 118 */ 119 u8 rc_tgt_offset_high; 120 /** 121 * @rc_tgt_offset_low: 122 * Offset to bits/group used by RC to determine QP adjustment 123 */ 124 u8 rc_tgt_offset_low; 125 /** 126 * @bits_per_pixel: 127 * Target bits per pixel with 4 fractional bits, bits_per_pixel << 4 128 */ 129 u16 bits_per_pixel; 130 /** 131 * @rc_edge_factor: 132 * Factor to determine if an edge is present based on the bits produced 133 */ 134 u8 rc_edge_factor; 135 /** 136 * @rc_quant_incr_limit1: 137 * Slow down incrementing once the range reaches this value 138 */ 139 u8 rc_quant_incr_limit1; 140 /** 141 * @rc_quant_incr_limit0: 142 * Slow down incrementing once the range reaches this value 143 */ 144 u8 rc_quant_incr_limit0; 145 /** 146 * @initial_xmit_delay: 147 * Number of pixels to delay the initial transmission 148 */ 149 u16 initial_xmit_delay; 150 /** 151 * @initial_dec_delay: 152 * Initial decoder delay, number of pixel times that the decoder 153 * accumulates data in its rate buffer before starting to decode 154 * and output pixels. 155 */ 156 u16 initial_dec_delay; 157 /** 158 * @block_pred_enable: 159 * True if block prediction is used to code any groups within the 160 * picture. False if BP not used 161 */ 162 bool block_pred_enable; 163 /** 164 * @first_line_bpg_offset: 165 * Number of additional bits allocated for each group on the first 166 * line of slice. 167 */ 168 u8 first_line_bpg_offset; 169 /** 170 * @initial_offset: Value to use for RC model offset at slice start 171 */ 172 u16 initial_offset; 173 /** 174 * @rc_buf_thresh: Thresholds defining each of the buffer ranges 175 */ 176 u16 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1]; 177 /** 178 * @rc_range_params: 179 * Parameters for each of the RC ranges defined in 180 * &struct drm_dsc_rc_range_parameters 181 */ 182 struct drm_dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES]; 183 /** 184 * @rc_model_size: Total size of RC model 185 */ 186 u16 rc_model_size; 187 /** 188 * @flatness_min_qp: Minimum QP where flatness information is sent 189 */ 190 u8 flatness_min_qp; 191 /** 192 * @flatness_max_qp: Maximum QP where flatness information is sent 193 */ 194 u8 flatness_max_qp; 195 /** 196 * @initial_scale_value: Initial value for the scale factor 197 */ 198 u8 initial_scale_value; 199 /** 200 * @scale_decrement_interval: 201 * Specifies number of group times between decrementing the scale factor 202 * at beginning of a slice. 203 */ 204 u16 scale_decrement_interval; 205 /** 206 * @scale_increment_interval: 207 * Number of group times between incrementing the scale factor value 208 * used at the beginning of a slice. 209 */ 210 u16 scale_increment_interval; 211 /** 212 * @nfl_bpg_offset: Non first line BPG offset to be used 213 */ 214 u16 nfl_bpg_offset; 215 /** 216 * @slice_bpg_offset: BPG offset used to enforce slice bit 217 */ 218 u16 slice_bpg_offset; 219 /** 220 * @final_offset: Final RC linear transformation offset value 221 */ 222 u16 final_offset; 223 /** 224 * @vbr_enable: True if VBR mode is enabled, false if disabled 225 */ 226 bool vbr_enable; 227 /** 228 * @mux_word_size: Mux word size (in bits) for SSM mode 229 */ 230 u8 mux_word_size; 231 /** 232 * @slice_chunk_size: 233 * The (max) size in bytes of the "chunks" that are used in slice 234 * multiplexing. 235 */ 236 u16 slice_chunk_size; 237 /** 238 * @rc_bits: Rate control buffer size in bits 239 */ 240 u16 rc_bits; 241 /** 242 * @dsc_version_minor: DSC minor version 243 */ 244 u8 dsc_version_minor; 245 /** 246 * @dsc_version_major: DSC major version 247 */ 248 u8 dsc_version_major; 249 /** 250 * @native_422: True if Native 4:2:2 supported, else false 251 */ 252 bool native_422; 253 /** 254 * @native_420: True if Native 4:2:0 supported else false. 255 */ 256 bool native_420; 257 /** 258 * @second_line_bpg_offset: 259 * Additional bits/grp for seconnd line of slice for native 4:2:0 260 */ 261 u8 second_line_bpg_offset; 262 /** 263 * @nsl_bpg_offset: 264 * Num of bits deallocated for each grp that is not in second line of 265 * slice 266 */ 267 u16 nsl_bpg_offset; 268 /** 269 * @second_line_offset_adj: 270 * Offset adjustment for second line in Native 4:2:0 mode 271 */ 272 u16 second_line_offset_adj; 273 }; 274 275 /** 276 * struct picture_parameter_set - Represents 128 bytes of Picture Parameter Set 277 * 278 * The VESA DSC standard defines picture parameter set (PPS) which display 279 * stream compression encoders must communicate to decoders. 280 * The PPS is encapsulated in 128 bytes (PPS 0 through PPS 127). The fields in 281 * this structure are as per Table 4.1 in Vesa DSC specification v1.1/v1.2. 282 * The PPS fields that span over more than a byte should be stored in Big Endian 283 * format. 284 */ 285 struct drm_dsc_picture_parameter_set { 286 /** 287 * @dsc_version: 288 * PPS0[3:0] - dsc_version_minor: Contains Minor version of DSC 289 * PPS0[7:4] - dsc_version_major: Contains major version of DSC 290 */ 291 u8 dsc_version; 292 /** 293 * @pps_identifier: 294 * PPS1[7:0] - Application specific identifier that can be 295 * used to differentiate between different PPS tables. 296 */ 297 u8 pps_identifier; 298 /** 299 * @pps_reserved: 300 * PPS2[7:0]- RESERVED Byte 301 */ 302 u8 pps_reserved; 303 /** 304 * @pps_3: 305 * PPS3[3:0] - linebuf_depth: Contains linebuffer bit depth used to 306 * generate the bitstream. (0x0 - 16 bits for DSC 1.2, 0x8 - 8 bits, 307 * 0xA - 10 bits, 0xB - 11 bits, 0xC - 12 bits, 0xD - 13 bits, 308 * 0xE - 14 bits for DSC1.2, 0xF - 14 bits for DSC 1.2. 309 * PPS3[7:4] - bits_per_component: Bits per component for the original 310 * pixels of the encoded picture. 311 * 0x0 = 16bpc (allowed only when dsc_version_minor = 0x2) 312 * 0x8 = 8bpc, 0xA = 10bpc, 0xC = 12bpc, 0xE = 14bpc (also 313 * allowed only when dsc_minor_version = 0x2) 314 */ 315 u8 pps_3; 316 /** 317 * @pps_4: 318 * PPS4[1:0] -These are the most significant 2 bits of 319 * compressed BPP bits_per_pixel[9:0] syntax element. 320 * PPS4[2] - vbr_enable: 0 = VBR disabled, 1 = VBR enabled 321 * PPS4[3] - simple_422: Indicates if decoder drops samples to 322 * reconstruct the 4:2:2 picture. 323 * PPS4[4] - Convert_rgb: Indicates if DSC color space conversion is 324 * active. 325 * PPS4[5] - blobk_pred_enable: Indicates if BP is used to code any 326 * groups in picture 327 * PPS4[7:6] - Reseved bits 328 */ 329 u8 pps_4; 330 /** 331 * @bits_per_pixel_low: 332 * PPS5[7:0] - This indicates the lower significant 8 bits of 333 * the compressed BPP bits_per_pixel[9:0] element. 334 */ 335 u8 bits_per_pixel_low; 336 /** 337 * @pic_height: 338 * PPS6[7:0], PPS7[7:0] -pic_height: Specifies the number of pixel rows 339 * within the raster. 340 */ 341 __be16 pic_height; 342 /** 343 * @pic_width: 344 * PPS8[7:0], PPS9[7:0] - pic_width: Number of pixel columns within 345 * the raster. 346 */ 347 __be16 pic_width; 348 /** 349 * @slice_height: 350 * PPS10[7:0], PPS11[7:0] - Slice height in units of pixels. 351 */ 352 __be16 slice_height; 353 /** 354 * @slice_width: 355 * PPS12[7:0], PPS13[7:0] - Slice width in terms of pixels. 356 */ 357 __be16 slice_width; 358 /** 359 * @chunk_size: 360 * PPS14[7:0], PPS15[7:0] - Size in units of bytes of the chunks 361 * that are used for slice multiplexing. 362 */ 363 __be16 chunk_size; 364 /** 365 * @initial_xmit_delay_high: 366 * PPS16[1:0] - Most Significant two bits of initial transmission delay. 367 * It specifies the number of pixel times that the encoder waits before 368 * transmitting data from its rate buffer. 369 * PPS16[7:2] - Reserved 370 */ 371 u8 initial_xmit_delay_high; 372 /** 373 * @initial_xmit_delay_low: 374 * PPS17[7:0] - Least significant 8 bits of initial transmission delay. 375 */ 376 u8 initial_xmit_delay_low; 377 /** 378 * @initial_dec_delay: 379 * 380 * PPS18[7:0], PPS19[7:0] - Initial decoding delay which is the number 381 * of pixel times that the decoder accumulates data in its rate buffer 382 * before starting to decode and output pixels. 383 */ 384 __be16 initial_dec_delay; 385 /** 386 * @pps20_reserved: 387 * 388 * PPS20[7:0] - Reserved 389 */ 390 u8 pps20_reserved; 391 /** 392 * @initial_scale_value: 393 * PPS21[5:0] - Initial rcXformScale factor used at beginning 394 * of a slice. 395 * PPS21[7:6] - Reserved 396 */ 397 u8 initial_scale_value; 398 /** 399 * @scale_increment_interval: 400 * PPS22[7:0], PPS23[7:0] - Number of group times between incrementing 401 * the rcXformScale factor at end of a slice. 402 */ 403 __be16 scale_increment_interval; 404 /** 405 * @scale_decrement_interval_high: 406 * PPS24[3:0] - Higher 4 bits indicating number of group times between 407 * decrementing the rcXformScale factor at beginning of a slice. 408 * PPS24[7:4] - Reserved 409 */ 410 u8 scale_decrement_interval_high; 411 /** 412 * @scale_decrement_interval_low: 413 * PPS25[7:0] - Lower 8 bits of scale decrement interval 414 */ 415 u8 scale_decrement_interval_low; 416 /** 417 * @pps26_reserved: 418 * PPS26[7:0] 419 */ 420 u8 pps26_reserved; 421 /** 422 * @first_line_bpg_offset: 423 * PPS27[4:0] - Number of additional bits that are allocated 424 * for each group on first line of a slice. 425 * PPS27[7:5] - Reserved 426 */ 427 u8 first_line_bpg_offset; 428 /** 429 * @nfl_bpg_offset: 430 * PPS28[7:0], PPS29[7:0] - Number of bits including frac bits 431 * deallocated for each group for groups after the first line of slice. 432 */ 433 __be16 nfl_bpg_offset; 434 /** 435 * @slice_bpg_offset: 436 * PPS30, PPS31[7:0] - Number of bits that are deallocated for each 437 * group to enforce the slice constraint. 438 */ 439 __be16 slice_bpg_offset; 440 /** 441 * @initial_offset: 442 * PPS32,33[7:0] - Initial value for rcXformOffset 443 */ 444 __be16 initial_offset; 445 /** 446 * @final_offset: 447 * PPS34,35[7:0] - Maximum end-of-slice value for rcXformOffset 448 */ 449 __be16 final_offset; 450 /** 451 * @flatness_min_qp: 452 * PPS36[4:0] - Minimum QP at which flatness is signaled and 453 * flatness QP adjustment is made. 454 * PPS36[7:5] - Reserved 455 */ 456 u8 flatness_min_qp; 457 /** 458 * @flatness_max_qp: 459 * PPS37[4:0] - Max QP at which flatness is signalled and 460 * the flatness adjustment is made. 461 * PPS37[7:5] - Reserved 462 */ 463 u8 flatness_max_qp; 464 /** 465 * @rc_model_size: 466 * PPS38,39[7:0] - Number of bits within RC Model. 467 */ 468 __be16 rc_model_size; 469 /** 470 * @rc_edge_factor: 471 * PPS40[3:0] - Ratio of current activity vs, previous 472 * activity to determine presence of edge. 473 * PPS40[7:4] - Reserved 474 */ 475 u8 rc_edge_factor; 476 /** 477 * @rc_quant_incr_limit0: 478 * PPS41[4:0] - QP threshold used in short term RC 479 * PPS41[7:5] - Reserved 480 */ 481 u8 rc_quant_incr_limit0; 482 /** 483 * @rc_quant_incr_limit1: 484 * PPS42[4:0] - QP threshold used in short term RC 485 * PPS42[7:5] - Reserved 486 */ 487 u8 rc_quant_incr_limit1; 488 /** 489 * @rc_tgt_offset: 490 * PPS43[3:0] - Lower end of the variability range around the target 491 * bits per group that is allowed by short term RC. 492 * PPS43[7:4]- Upper end of the variability range around the target 493 * bits per group that i allowed by short term rc. 494 */ 495 u8 rc_tgt_offset; 496 /** 497 * @rc_buf_thresh: 498 * PPS44[7:0] - PPS57[7:0] - Specifies the thresholds in RC model for 499 * the 15 ranges defined by 14 thresholds. 500 */ 501 u8 rc_buf_thresh[DSC_NUM_BUF_RANGES - 1]; 502 /** 503 * @rc_range_parameters: 504 * PPS58[7:0] - PPS87[7:0] 505 * Parameters that correspond to each of the 15 ranges. 506 */ 507 __be16 rc_range_parameters[DSC_NUM_BUF_RANGES]; 508 /** 509 * @native_422_420: 510 * PPS88[0] - 0 = Native 4:2:2 not used 511 * 1 = Native 4:2:2 used 512 * PPS88[1] - 0 = Native 4:2:0 not use 513 * 1 = Native 4:2:0 used 514 * PPS88[7:2] - Reserved 6 bits 515 */ 516 u8 native_422_420; 517 /** 518 * @second_line_bpg_offset: 519 * PPS89[4:0] - Additional bits/group budget for the 520 * second line of a slice in Native 4:2:0 mode. 521 * Set to 0 if DSC minor version is 1 or native420 is 0. 522 * PPS89[7:5] - Reserved 523 */ 524 u8 second_line_bpg_offset; 525 /** 526 * @nsl_bpg_offset: 527 * PPS90[7:0], PPS91[7:0] - Number of bits that are deallocated 528 * for each group that is not in the second line of a slice. 529 */ 530 __be16 nsl_bpg_offset; 531 /** 532 * @second_line_offset_adj: 533 * PPS92[7:0], PPS93[7:0] - Used as offset adjustment for the second 534 * line in Native 4:2:0 mode. 535 */ 536 __be16 second_line_offset_adj; 537 /** 538 * @pps_long_94_reserved: 539 * PPS 94, 95, 96, 97 - Reserved 540 */ 541 u32 pps_long_94_reserved; 542 /** 543 * @pps_long_98_reserved: 544 * PPS 98, 99, 100, 101 - Reserved 545 */ 546 u32 pps_long_98_reserved; 547 /** 548 * @pps_long_102_reserved: 549 * PPS 102, 103, 104, 105 - Reserved 550 */ 551 u32 pps_long_102_reserved; 552 /** 553 * @pps_long_106_reserved: 554 * PPS 106, 107, 108, 109 - reserved 555 */ 556 u32 pps_long_106_reserved; 557 /** 558 * @pps_long_110_reserved: 559 * PPS 110, 111, 112, 113 - reserved 560 */ 561 u32 pps_long_110_reserved; 562 /** 563 * @pps_long_114_reserved: 564 * PPS 114 - 117 - reserved 565 */ 566 u32 pps_long_114_reserved; 567 /** 568 * @pps_long_118_reserved: 569 * PPS 118 - 121 - reserved 570 */ 571 u32 pps_long_118_reserved; 572 /** 573 * @pps_long_122_reserved: 574 * PPS 122- 125 - reserved 575 */ 576 u32 pps_long_122_reserved; 577 /** 578 * @pps_short_126_reserved: 579 * PPS 126, 127 - reserved 580 */ 581 __be16 pps_short_126_reserved; 582 } __packed; 583 584 /** 585 * struct drm_dsc_pps_infoframe - DSC infoframe carrying the Picture Parameter 586 * Set Metadata 587 * 588 * This structure represents the DSC PPS infoframe required to send the Picture 589 * Parameter Set metadata required before enabling VESA Display Stream 590 * Compression. This is based on the DP Secondary Data Packet structure and 591 * comprises of SDP Header as defined &struct dp_sdp_header in drm_dp_helper.h 592 * and PPS payload defined in &struct drm_dsc_picture_parameter_set. 593 * 594 * @pps_header: Header for PPS as per DP SDP header format of type 595 * &struct dp_sdp_header 596 * @pps_payload: PPS payload fields as per DSC specification Table 4-1 597 * as represented in &struct drm_dsc_picture_parameter_set 598 */ 599 struct drm_dsc_pps_infoframe { 600 struct dp_sdp_header pps_header; 601 struct drm_dsc_picture_parameter_set pps_payload; 602 } __packed; 603 604 void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header); 605 void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_sdp, 606 const struct drm_dsc_config *dsc_cfg); 607 int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg); 608 609 #endif /* _DRM_DSC_H_ */ 610