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