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1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2018 Intel Corp
4 *
5 * Author:
6 * Manasi Navare <manasi.d.navare@intel.com>
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/errno.h>
13#include <linux/byteorder/generic.h>
14
15#include <drm/display/drm_dp_helper.h>
16#include <drm/display/drm_dsc_helper.h>
17#include <drm/drm_print.h>
18
19/**
20 * DOC: dsc helpers
21 *
22 * VESA specification for DP 1.4 adds a new feature called Display Stream
23 * Compression (DSC) used to compress the pixel bits before sending it on
24 * DP/eDP/MIPI DSI interface. DSC is required to be enabled so that the existing
25 * display interfaces can support high resolutions at higher frames rates uisng
26 * the maximum available link capacity of these interfaces.
27 *
28 * These functions contain some common logic and helpers to deal with VESA
29 * Display Stream Compression standard required for DSC on Display Port/eDP or
30 * MIPI display interfaces.
31 */
32
33/**
34 * drm_dsc_dp_pps_header_init() - Initializes the PPS Header
35 * for DisplayPort as per the DP 1.4 spec.
36 * @pps_header: Secondary data packet header for DSC Picture
37 * Parameter Set as defined in &struct dp_sdp_header
38 *
39 * DP 1.4 spec defines the secondary data packet for sending the
40 * picture parameter infoframes from the source to the sink.
41 * This function populates the SDP header defined in
42 * &struct dp_sdp_header.
43 */
44void drm_dsc_dp_pps_header_init(struct dp_sdp_header *pps_header)
45{
46 memset(pps_header, 0, sizeof(*pps_header));
47
48 pps_header->HB1 = DP_SDP_PPS;
49 pps_header->HB2 = DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1;
50}
51EXPORT_SYMBOL(drm_dsc_dp_pps_header_init);
52
53/**
54 * drm_dsc_dp_rc_buffer_size - get rc buffer size in bytes
55 * @rc_buffer_block_size: block size code, according to DPCD offset 62h
56 * @rc_buffer_size: number of blocks - 1, according to DPCD offset 63h
57 *
58 * return:
59 * buffer size in bytes, or 0 on invalid input
60 */
61int drm_dsc_dp_rc_buffer_size(u8 rc_buffer_block_size, u8 rc_buffer_size)
62{
63 int size = 1024 * (rc_buffer_size + 1);
64
65 switch (rc_buffer_block_size) {
66 case DP_DSC_RC_BUF_BLK_SIZE_1:
67 return 1 * size;
68 case DP_DSC_RC_BUF_BLK_SIZE_4:
69 return 4 * size;
70 case DP_DSC_RC_BUF_BLK_SIZE_16:
71 return 16 * size;
72 case DP_DSC_RC_BUF_BLK_SIZE_64:
73 return 64 * size;
74 default:
75 return 0;
76 }
77}
78EXPORT_SYMBOL(drm_dsc_dp_rc_buffer_size);
79
80/**
81 * drm_dsc_pps_payload_pack() - Populates the DSC PPS
82 *
83 * @pps_payload:
84 * Bitwise struct for DSC Picture Parameter Set. This is defined
85 * by &struct drm_dsc_picture_parameter_set
86 * @dsc_cfg:
87 * DSC Configuration data filled by driver as defined by
88 * &struct drm_dsc_config
89 *
90 * DSC source device sends a picture parameter set (PPS) containing the
91 * information required by the sink to decode the compressed frame. Driver
92 * populates the DSC PPS struct using the DSC configuration parameters in
93 * the order expected by the DSC Display Sink device. For the DSC, the sink
94 * device expects the PPS payload in big endian format for fields
95 * that span more than 1 byte.
96 */
97void drm_dsc_pps_payload_pack(struct drm_dsc_picture_parameter_set *pps_payload,
98 const struct drm_dsc_config *dsc_cfg)
99{
100 int i;
101
102 /* Protect against someone accidentally changing struct size */
103 BUILD_BUG_ON(sizeof(*pps_payload) !=
104 DP_SDP_PPS_HEADER_PAYLOAD_BYTES_MINUS_1 + 1);
105
106 memset(pps_payload, 0, sizeof(*pps_payload));
107
108 /* PPS 0 */
109 pps_payload->dsc_version =
110 dsc_cfg->dsc_version_minor |
111 dsc_cfg->dsc_version_major << DSC_PPS_VERSION_MAJOR_SHIFT;
112
113 /* PPS 1, 2 is 0 */
114
115 /* PPS 3 */
116 pps_payload->pps_3 =
117 dsc_cfg->line_buf_depth |
118 dsc_cfg->bits_per_component << DSC_PPS_BPC_SHIFT;
119
120 /* PPS 4 */
121 pps_payload->pps_4 =
122 ((dsc_cfg->bits_per_pixel & DSC_PPS_BPP_HIGH_MASK) >>
123 DSC_PPS_MSB_SHIFT) |
124 dsc_cfg->vbr_enable << DSC_PPS_VBR_EN_SHIFT |
125 dsc_cfg->simple_422 << DSC_PPS_SIMPLE422_SHIFT |
126 dsc_cfg->convert_rgb << DSC_PPS_CONVERT_RGB_SHIFT |
127 dsc_cfg->block_pred_enable << DSC_PPS_BLOCK_PRED_EN_SHIFT;
128
129 /* PPS 5 */
130 pps_payload->bits_per_pixel_low =
131 (dsc_cfg->bits_per_pixel & DSC_PPS_LSB_MASK);
132
133 /*
134 * The DSC panel expects the PPS packet to have big endian format
135 * for data spanning 2 bytes. Use a macro cpu_to_be16() to convert
136 * to big endian format. If format is little endian, it will swap
137 * bytes to convert to Big endian else keep it unchanged.
138 */
139
140 /* PPS 6, 7 */
141 pps_payload->pic_height = cpu_to_be16(dsc_cfg->pic_height);
142
143 /* PPS 8, 9 */
144 pps_payload->pic_width = cpu_to_be16(dsc_cfg->pic_width);
145
146 /* PPS 10, 11 */
147 pps_payload->slice_height = cpu_to_be16(dsc_cfg->slice_height);
148
149 /* PPS 12, 13 */
150 pps_payload->slice_width = cpu_to_be16(dsc_cfg->slice_width);
151
152 /* PPS 14, 15 */
153 pps_payload->chunk_size = cpu_to_be16(dsc_cfg->slice_chunk_size);
154
155 /* PPS 16 */
156 pps_payload->initial_xmit_delay_high =
157 ((dsc_cfg->initial_xmit_delay &
158 DSC_PPS_INIT_XMIT_DELAY_HIGH_MASK) >>
159 DSC_PPS_MSB_SHIFT);
160
161 /* PPS 17 */
162 pps_payload->initial_xmit_delay_low =
163 (dsc_cfg->initial_xmit_delay & DSC_PPS_LSB_MASK);
164
165 /* PPS 18, 19 */
166 pps_payload->initial_dec_delay =
167 cpu_to_be16(dsc_cfg->initial_dec_delay);
168
169 /* PPS 20 is 0 */
170
171 /* PPS 21 */
172 pps_payload->initial_scale_value =
173 dsc_cfg->initial_scale_value;
174
175 /* PPS 22, 23 */
176 pps_payload->scale_increment_interval =
177 cpu_to_be16(dsc_cfg->scale_increment_interval);
178
179 /* PPS 24 */
180 pps_payload->scale_decrement_interval_high =
181 ((dsc_cfg->scale_decrement_interval &
182 DSC_PPS_SCALE_DEC_INT_HIGH_MASK) >>
183 DSC_PPS_MSB_SHIFT);
184
185 /* PPS 25 */
186 pps_payload->scale_decrement_interval_low =
187 (dsc_cfg->scale_decrement_interval & DSC_PPS_LSB_MASK);
188
189 /* PPS 26[7:0], PPS 27[7:5] RESERVED */
190
191 /* PPS 27 */
192 pps_payload->first_line_bpg_offset =
193 dsc_cfg->first_line_bpg_offset;
194
195 /* PPS 28, 29 */
196 pps_payload->nfl_bpg_offset =
197 cpu_to_be16(dsc_cfg->nfl_bpg_offset);
198
199 /* PPS 30, 31 */
200 pps_payload->slice_bpg_offset =
201 cpu_to_be16(dsc_cfg->slice_bpg_offset);
202
203 /* PPS 32, 33 */
204 pps_payload->initial_offset =
205 cpu_to_be16(dsc_cfg->initial_offset);
206
207 /* PPS 34, 35 */
208 pps_payload->final_offset = cpu_to_be16(dsc_cfg->final_offset);
209
210 /* PPS 36 */
211 pps_payload->flatness_min_qp = dsc_cfg->flatness_min_qp;
212
213 /* PPS 37 */
214 pps_payload->flatness_max_qp = dsc_cfg->flatness_max_qp;
215
216 /* PPS 38, 39 */
217 pps_payload->rc_model_size = cpu_to_be16(dsc_cfg->rc_model_size);
218
219 /* PPS 40 */
220 pps_payload->rc_edge_factor = DSC_RC_EDGE_FACTOR_CONST;
221
222 /* PPS 41 */
223 pps_payload->rc_quant_incr_limit0 =
224 dsc_cfg->rc_quant_incr_limit0;
225
226 /* PPS 42 */
227 pps_payload->rc_quant_incr_limit1 =
228 dsc_cfg->rc_quant_incr_limit1;
229
230 /* PPS 43 */
231 pps_payload->rc_tgt_offset = DSC_RC_TGT_OFFSET_LO_CONST |
232 DSC_RC_TGT_OFFSET_HI_CONST << DSC_PPS_RC_TGT_OFFSET_HI_SHIFT;
233
234 /* PPS 44 - 57 */
235 for (i = 0; i < DSC_NUM_BUF_RANGES - 1; i++)
236 pps_payload->rc_buf_thresh[i] =
237 dsc_cfg->rc_buf_thresh[i];
238
239 /* PPS 58 - 87 */
240 /*
241 * For DSC sink programming the RC Range parameter fields
242 * are as follows: Min_qp[15:11], max_qp[10:6], offset[5:0]
243 */
244 for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
245 pps_payload->rc_range_parameters[i] =
246 cpu_to_be16((dsc_cfg->rc_range_params[i].range_min_qp <<
247 DSC_PPS_RC_RANGE_MINQP_SHIFT) |
248 (dsc_cfg->rc_range_params[i].range_max_qp <<
249 DSC_PPS_RC_RANGE_MAXQP_SHIFT) |
250 (dsc_cfg->rc_range_params[i].range_bpg_offset));
251 }
252
253 /* PPS 88 */
254 pps_payload->native_422_420 = dsc_cfg->native_422 |
255 dsc_cfg->native_420 << DSC_PPS_NATIVE_420_SHIFT;
256
257 /* PPS 89 */
258 pps_payload->second_line_bpg_offset =
259 dsc_cfg->second_line_bpg_offset;
260
261 /* PPS 90, 91 */
262 pps_payload->nsl_bpg_offset =
263 cpu_to_be16(dsc_cfg->nsl_bpg_offset);
264
265 /* PPS 92, 93 */
266 pps_payload->second_line_offset_adj =
267 cpu_to_be16(dsc_cfg->second_line_offset_adj);
268
269 /* PPS 94 - 127 are O */
270}
271EXPORT_SYMBOL(drm_dsc_pps_payload_pack);
272
273/**
274 * drm_dsc_set_const_params() - Set DSC parameters considered typically
275 * constant across operation modes
276 *
277 * @vdsc_cfg:
278 * DSC Configuration data partially filled by driver
279 */
280void drm_dsc_set_const_params(struct drm_dsc_config *vdsc_cfg)
281{
282 if (!vdsc_cfg->rc_model_size)
283 vdsc_cfg->rc_model_size = DSC_RC_MODEL_SIZE_CONST;
284 vdsc_cfg->rc_edge_factor = DSC_RC_EDGE_FACTOR_CONST;
285 vdsc_cfg->rc_tgt_offset_high = DSC_RC_TGT_OFFSET_HI_CONST;
286 vdsc_cfg->rc_tgt_offset_low = DSC_RC_TGT_OFFSET_LO_CONST;
287
288 if (vdsc_cfg->bits_per_component <= 10)
289 vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_8_10_BPC;
290 else
291 vdsc_cfg->mux_word_size = DSC_MUX_WORD_SIZE_12_BPC;
292}
293EXPORT_SYMBOL(drm_dsc_set_const_params);
294
295/* From DSC_v1.11 spec, rc_parameter_Set syntax element typically constant */
296static const u16 drm_dsc_rc_buf_thresh[] = {
297 896, 1792, 2688, 3584, 4480, 5376, 6272, 6720, 7168, 7616,
298 7744, 7872, 8000, 8064
299};
300
301/**
302 * drm_dsc_set_rc_buf_thresh() - Set thresholds for the RC model
303 * in accordance with the DSC 1.2 specification.
304 *
305 * @vdsc_cfg: DSC Configuration data partially filled by driver
306 */
307void drm_dsc_set_rc_buf_thresh(struct drm_dsc_config *vdsc_cfg)
308{
309 int i;
310
311 BUILD_BUG_ON(ARRAY_SIZE(drm_dsc_rc_buf_thresh) !=
312 DSC_NUM_BUF_RANGES - 1);
313 BUILD_BUG_ON(ARRAY_SIZE(drm_dsc_rc_buf_thresh) !=
314 ARRAY_SIZE(vdsc_cfg->rc_buf_thresh));
315
316 for (i = 0; i < ARRAY_SIZE(drm_dsc_rc_buf_thresh); i++)
317 vdsc_cfg->rc_buf_thresh[i] = drm_dsc_rc_buf_thresh[i] >> 6;
318
319 /*
320 * For 6bpp, RC Buffer threshold 12 and 13 need a different value
321 * as per C Model
322 */
323 if (vdsc_cfg->bits_per_pixel == 6 << 4) {
324 vdsc_cfg->rc_buf_thresh[12] = 7936 >> 6;
325 vdsc_cfg->rc_buf_thresh[13] = 8000 >> 6;
326 }
327}
328EXPORT_SYMBOL(drm_dsc_set_rc_buf_thresh);
329
330struct rc_parameters {
331 u16 initial_xmit_delay;
332 u8 first_line_bpg_offset;
333 u16 initial_offset;
334 u8 flatness_min_qp;
335 u8 flatness_max_qp;
336 u8 rc_quant_incr_limit0;
337 u8 rc_quant_incr_limit1;
338 struct drm_dsc_rc_range_parameters rc_range_params[DSC_NUM_BUF_RANGES];
339};
340
341struct rc_parameters_data {
342 u8 bpp;
343 u8 bpc;
344 struct rc_parameters params;
345};
346
347#define DSC_BPP(bpp) ((bpp) << 4)
348
349/*
350 * Rate Control Related Parameter Recommended Values from DSC_v1.1 spec prior
351 * to DSC 1.1 fractional bpp underflow SCR (DSC_v1.1_E1.pdf)
352 *
353 * Cross-checked against C Model releases: DSC_model_20161212 and 20210623
354 */
355static const struct rc_parameters_data rc_parameters_pre_scr[] = {
356 {
357 .bpp = DSC_BPP(6), .bpc = 8,
358 { 683, 15, 6144, 3, 13, 11, 11, {
359 { 0, 2, 0 }, { 1, 4, -2 }, { 3, 6, -2 }, { 4, 6, -4 },
360 { 5, 7, -6 }, { 5, 7, -6 }, { 6, 7, -6 }, { 6, 8, -8 },
361 { 7, 9, -8 }, { 8, 10, -10 }, { 9, 11, -10 }, { 10, 12, -12 },
362 { 10, 13, -12 }, { 12, 14, -12 }, { 15, 15, -12 }
363 }
364 }
365 },
366 {
367 .bpp = DSC_BPP(8), .bpc = 8,
368 { 512, 12, 6144, 3, 12, 11, 11, {
369 { 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
370 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
371 { 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 }, { 5, 12, -12 },
372 { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
373 }
374 }
375 },
376 {
377 .bpp = DSC_BPP(8), .bpc = 10,
378 { 512, 12, 6144, 7, 16, 15, 15, {
379 /*
380 * DSC model/pre-SCR-cfg has 8 for range_max_qp[0], however
381 * VESA DSC 1.1 Table E-5 sets it to 4.
382 */
383 { 0, 4, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
384 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
385 { 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
386 { 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
387 }
388 }
389 },
390 {
391 .bpp = DSC_BPP(8), .bpc = 12,
392 { 512, 12, 6144, 11, 20, 19, 19, {
393 { 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
394 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
395 { 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
396 { 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
397 { 21, 23, -12 }
398 }
399 }
400 },
401 {
402 .bpp = DSC_BPP(10), .bpc = 8,
403 { 410, 12, 5632, 3, 12, 11, 11, {
404 { 0, 3, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 2, 6, -2 },
405 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
406 { 3, 9, -8 }, { 3, 9, -10 }, { 5, 10, -10 }, { 5, 11, -10 },
407 { 5, 12, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
408 }
409 }
410 },
411 {
412 .bpp = DSC_BPP(10), .bpc = 10,
413 { 410, 12, 5632, 7, 16, 15, 15, {
414 { 0, 7, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 6, 10, -2 },
415 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
416 { 7, 13, -8 }, { 7, 13, -10 }, { 9, 14, -10 }, { 9, 15, -10 },
417 { 9, 16, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
418 }
419 }
420 },
421 {
422 .bpp = DSC_BPP(10), .bpc = 12,
423 { 410, 12, 5632, 11, 20, 19, 19, {
424 { 0, 11, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 10, 14, -2 },
425 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
426 { 11, 17, -8 }, { 11, 17, -10 }, { 13, 18, -10 },
427 { 13, 19, -10 }, { 13, 20, -12 }, { 15, 21, -12 },
428 { 21, 23, -12 }
429 }
430 }
431 },
432 {
433 .bpp = DSC_BPP(12), .bpc = 8,
434 { 341, 15, 2048, 3, 12, 11, 11, {
435 { 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
436 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
437 { 3, 9, -8 }, { 3, 10, -10 }, { 5, 11, -10 },
438 { 5, 12, -12 }, { 5, 13, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
439 }
440 }
441 },
442 {
443 .bpp = DSC_BPP(12), .bpc = 10,
444 { 341, 15, 2048, 7, 16, 15, 15, {
445 { 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
446 { 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
447 { 7, 13, -8 }, { 7, 14, -10 }, { 9, 15, -10 }, { 9, 16, -12 },
448 { 9, 17, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
449 }
450 }
451 },
452 {
453 .bpp = DSC_BPP(12), .bpc = 12,
454 { 341, 15, 2048, 11, 20, 19, 19, {
455 { 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
456 { 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
457 { 11, 17, -8 }, { 11, 18, -10 }, { 13, 19, -10 },
458 { 13, 20, -12 }, { 13, 21, -12 }, { 15, 21, -12 },
459 { 21, 23, -12 }
460 }
461 }
462 },
463 {
464 .bpp = DSC_BPP(15), .bpc = 8,
465 { 273, 15, 2048, 3, 12, 11, 11, {
466 { 0, 0, 10 }, { 0, 1, 8 }, { 0, 1, 6 }, { 0, 2, 4 },
467 { 1, 2, 2 }, { 1, 3, 0 }, { 1, 4, -2 }, { 2, 4, -4 },
468 { 3, 4, -6 }, { 3, 5, -8 }, { 4, 6, -10 }, { 5, 7, -10 },
469 { 5, 8, -12 }, { 7, 13, -12 }, { 13, 15, -12 }
470 }
471 }
472 },
473 {
474 .bpp = DSC_BPP(15), .bpc = 10,
475 { 273, 15, 2048, 7, 16, 15, 15, {
476 { 0, 2, 10 }, { 2, 5, 8 }, { 3, 5, 6 }, { 4, 6, 4 },
477 { 5, 6, 2 }, { 5, 7, 0 }, { 5, 8, -2 }, { 6, 8, -4 },
478 { 7, 8, -6 }, { 7, 9, -8 }, { 8, 10, -10 }, { 9, 11, -10 },
479 { 9, 12, -12 }, { 11, 17, -12 }, { 17, 19, -12 }
480 }
481 }
482 },
483 {
484 .bpp = DSC_BPP(15), .bpc = 12,
485 { 273, 15, 2048, 11, 20, 19, 19, {
486 { 0, 4, 10 }, { 2, 7, 8 }, { 4, 9, 6 }, { 6, 11, 4 },
487 { 9, 11, 2 }, { 9, 11, 0 }, { 9, 12, -2 }, { 10, 12, -4 },
488 { 11, 12, -6 }, { 11, 13, -8 }, { 12, 14, -10 },
489 { 13, 15, -10 }, { 13, 16, -12 }, { 15, 21, -12 },
490 { 21, 23, -12 }
491 }
492 }
493 },
494 { /* sentinel */ }
495};
496
497/*
498 * Selected Rate Control Related Parameter Recommended Values from DSC v1.2, v1.2a, v1.2b and
499 * DSC_v1.1_E1 specs.
500 *
501 * Cross-checked against C Model releases: DSC_model_20161212 and 20210623
502 */
503static const struct rc_parameters_data rc_parameters_1_2_444[] = {
504 {
505 .bpp = DSC_BPP(6), .bpc = 8,
506 { 768, 15, 6144, 3, 13, 11, 11, {
507 { 0, 4, 0 }, { 1, 6, -2 }, { 3, 8, -2 }, { 4, 8, -4 },
508 { 5, 9, -6 }, { 5, 9, -6 }, { 6, 9, -6 }, { 6, 10, -8 },
509 { 7, 11, -8 }, { 8, 12, -10 }, { 9, 12, -10 }, { 10, 12, -12 },
510 { 10, 12, -12 }, { 11, 12, -12 }, { 13, 14, -12 }
511 }
512 }
513 },
514 {
515 .bpp = DSC_BPP(6), .bpc = 10,
516 { 768, 15, 6144, 7, 17, 15, 15, {
517 { 0, 8, 0 }, { 3, 10, -2 }, { 7, 12, -2 }, { 8, 12, -4 },
518 { 9, 13, -6 }, { 9, 13, -6 }, { 10, 13, -6 }, { 10, 14, -8 },
519 { 11, 15, -8 }, { 12, 16, -10 }, { 13, 16, -10 },
520 { 14, 16, -12 }, { 14, 16, -12 }, { 15, 16, -12 },
521 { 17, 18, -12 }
522 }
523 }
524 },
525 {
526 .bpp = DSC_BPP(6), .bpc = 12,
527 { 768, 15, 6144, 11, 21, 19, 19, {
528 { 0, 12, 0 }, { 5, 14, -2 }, { 11, 16, -2 }, { 12, 16, -4 },
529 { 13, 17, -6 }, { 13, 17, -6 }, { 14, 17, -6 }, { 14, 18, -8 },
530 { 15, 19, -8 }, { 16, 20, -10 }, { 17, 20, -10 },
531 { 18, 20, -12 }, { 18, 20, -12 }, { 19, 20, -12 },
532 { 21, 22, -12 }
533 }
534 }
535 },
536 {
537 .bpp = DSC_BPP(6), .bpc = 14,
538 { 768, 15, 6144, 15, 25, 23, 23, {
539 { 0, 16, 0 }, { 7, 18, -2 }, { 15, 20, -2 }, { 16, 20, -4 },
540 { 17, 21, -6 }, { 17, 21, -6 }, { 18, 21, -6 }, { 18, 22, -8 },
541 { 19, 23, -8 }, { 20, 24, -10 }, { 21, 24, -10 },
542 { 22, 24, -12 }, { 22, 24, -12 }, { 23, 24, -12 },
543 { 25, 26, -12 }
544 }
545 }
546 },
547 {
548 .bpp = DSC_BPP(6), .bpc = 16,
549 { 768, 15, 6144, 19, 29, 27, 27, {
550 { 0, 20, 0 }, { 9, 22, -2 }, { 19, 24, -2 }, { 20, 24, -4 },
551 { 21, 25, -6 }, { 21, 25, -6 }, { 22, 25, -6 }, { 22, 26, -8 },
552 { 23, 27, -8 }, { 24, 28, -10 }, { 25, 28, -10 },
553 { 26, 28, -12 }, { 26, 28, -12 }, { 27, 28, -12 },
554 { 29, 30, -12 }
555 }
556 }
557 },
558 {
559 .bpp = DSC_BPP(8), .bpc = 8,
560 { 512, 12, 6144, 3, 12, 11, 11, {
561 { 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
562 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
563 { 3, 9, -8 }, { 3, 10, -10 }, { 5, 10, -10 }, { 5, 11, -12 },
564 { 5, 11, -12 }, { 9, 12, -12 }, { 12, 13, -12 }
565 }
566 }
567 },
568 {
569 .bpp = DSC_BPP(8), .bpc = 10,
570 { 512, 12, 6144, 7, 16, 15, 15, {
571 { 0, 8, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
572 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
573 { 7, 13, -8 }, { 7, 14, -10 }, { 9, 14, -10 }, { 9, 15, -12 },
574 { 9, 15, -12 }, { 13, 16, -12 }, { 16, 17, -12 }
575 }
576 }
577 },
578 {
579 .bpp = DSC_BPP(8), .bpc = 12,
580 { 512, 12, 6144, 11, 20, 19, 19, {
581 { 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
582 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
583 { 11, 17, -8 }, { 11, 18, -10 }, { 13, 18, -10 },
584 { 13, 19, -12 }, { 13, 19, -12 }, { 17, 20, -12 },
585 { 20, 21, -12 }
586 }
587 }
588 },
589 {
590 .bpp = DSC_BPP(8), .bpc = 14,
591 { 512, 12, 6144, 15, 24, 23, 23, {
592 { 0, 12, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 12, 17, -2 },
593 { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
594 { 15, 21, -8 }, { 15, 22, -10 }, { 17, 22, -10 },
595 { 17, 23, -12 }, { 17, 23, -12 }, { 21, 24, -12 },
596 { 24, 25, -12 }
597 }
598 }
599 },
600 {
601 .bpp = DSC_BPP(8), .bpc = 16,
602 { 512, 12, 6144, 19, 28, 27, 27, {
603 { 0, 12, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 15, 20, -2 },
604 { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
605 { 19, 25, -8 }, { 19, 26, -10 }, { 21, 26, -10 },
606 { 21, 27, -12 }, { 21, 27, -12 }, { 25, 28, -12 },
607 { 28, 29, -12 }
608 }
609 }
610 },
611 {
612 .bpp = DSC_BPP(10), .bpc = 8,
613 { 410, 15, 5632, 3, 12, 11, 11, {
614 { 0, 3, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 2, 6, -2 },
615 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
616 { 3, 9, -8 }, { 3, 9, -10 }, { 5, 10, -10 }, { 5, 10, -10 },
617 { 5, 11, -12 }, { 7, 11, -12 }, { 11, 12, -12 }
618 }
619 }
620 },
621 {
622 .bpp = DSC_BPP(10), .bpc = 10,
623 { 410, 15, 5632, 7, 16, 15, 15, {
624 { 0, 7, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 6, 10, -2 },
625 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
626 { 7, 13, -8 }, { 7, 13, -10 }, { 9, 14, -10 }, { 9, 14, -10 },
627 { 9, 15, -12 }, { 11, 15, -12 }, { 15, 16, -12 }
628 }
629 }
630 },
631 {
632 .bpp = DSC_BPP(10), .bpc = 12,
633 { 410, 15, 5632, 11, 20, 19, 19, {
634 { 0, 11, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 10, 14, -2 },
635 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
636 { 11, 17, -8 }, { 11, 17, -10 }, { 13, 18, -10 },
637 { 13, 18, -10 }, { 13, 19, -12 }, { 15, 19, -12 },
638 { 19, 20, -12 }
639 }
640 }
641 },
642 {
643 .bpp = DSC_BPP(10), .bpc = 14,
644 { 410, 15, 5632, 15, 24, 23, 23, {
645 { 0, 11, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 13, 18, -2 },
646 { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
647 { 15, 21, -8 }, { 15, 21, -10 }, { 17, 22, -10 },
648 { 17, 22, -10 }, { 17, 23, -12 }, { 19, 23, -12 },
649 { 23, 24, -12 }
650 }
651 }
652 },
653 {
654 .bpp = DSC_BPP(10), .bpc = 16,
655 { 410, 15, 5632, 19, 28, 27, 27, {
656 { 0, 11, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 16, 20, -2 },
657 { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
658 { 19, 25, -8 }, { 19, 25, -10 }, { 21, 26, -10 },
659 { 21, 26, -10 }, { 21, 27, -12 }, { 23, 27, -12 },
660 { 27, 28, -12 }
661 }
662 }
663 },
664 {
665 .bpp = DSC_BPP(12), .bpc = 8,
666 { 341, 15, 2048, 3, 12, 11, 11, {
667 { 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
668 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
669 { 3, 8, -8 }, { 3, 9, -10 }, { 5, 9, -10 }, { 5, 9, -12 },
670 { 5, 9, -12 }, { 7, 10, -12 }, { 10, 11, -12 }
671 }
672 }
673 },
674 {
675 .bpp = DSC_BPP(12), .bpc = 10,
676 { 341, 15, 2048, 7, 16, 15, 15, {
677 { 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
678 { 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
679 { 7, 12, -8 }, { 7, 13, -10 }, { 9, 13, -10 }, { 9, 13, -12 },
680 { 9, 13, -12 }, { 11, 14, -12 }, { 14, 15, -12 }
681 }
682 }
683 },
684 {
685 .bpp = DSC_BPP(12), .bpc = 12,
686 { 341, 15, 2048, 11, 20, 19, 19, {
687 { 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
688 { 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
689 { 11, 16, -8 }, { 11, 17, -10 }, { 13, 17, -10 },
690 { 13, 17, -12 }, { 13, 17, -12 }, { 15, 18, -12 },
691 { 18, 19, -12 }
692 }
693 }
694 },
695 {
696 .bpp = DSC_BPP(12), .bpc = 14,
697 { 341, 15, 2048, 15, 24, 23, 23, {
698 { 0, 6, 2 }, { 7, 10, 0 }, { 9, 13, 0 }, { 11, 16, -2 },
699 { 14, 17, -4 }, { 15, 18, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
700 { 15, 20, -8 }, { 15, 21, -10 }, { 17, 21, -10 },
701 { 17, 21, -12 }, { 17, 21, -12 }, { 19, 22, -12 },
702 { 22, 23, -12 }
703 }
704 }
705 },
706 {
707 .bpp = DSC_BPP(12), .bpc = 16,
708 { 341, 15, 2048, 19, 28, 27, 27, {
709 { 0, 6, 2 }, { 6, 11, 0 }, { 11, 15, 0 }, { 14, 18, -2 },
710 { 18, 21, -4 }, { 19, 22, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
711 { 19, 24, -8 }, { 19, 25, -10 }, { 21, 25, -10 },
712 { 21, 25, -12 }, { 21, 25, -12 }, { 23, 26, -12 },
713 { 26, 27, -12 }
714 }
715 }
716 },
717 {
718 .bpp = DSC_BPP(15), .bpc = 8,
719 { 273, 15, 2048, 3, 12, 11, 11, {
720 { 0, 0, 10 }, { 0, 1, 8 }, { 0, 1, 6 }, { 0, 2, 4 },
721 { 1, 2, 2 }, { 1, 3, 0 }, { 1, 3, -2 }, { 2, 4, -4 },
722 { 2, 5, -6 }, { 3, 5, -8 }, { 4, 6, -10 }, { 4, 7, -10 },
723 { 5, 7, -12 }, { 7, 8, -12 }, { 8, 9, -12 }
724 }
725 }
726 },
727 {
728 .bpp = DSC_BPP(15), .bpc = 10,
729 { 273, 15, 2048, 7, 16, 15, 15, {
730 { 0, 2, 10 }, { 2, 5, 8 }, { 3, 5, 6 }, { 4, 6, 4 },
731 { 5, 6, 2 }, { 5, 7, 0 }, { 5, 7, -2 }, { 6, 8, -4 },
732 { 6, 9, -6 }, { 7, 9, -8 }, { 8, 10, -10 }, { 8, 11, -10 },
733 { 9, 11, -12 }, { 11, 12, -12 }, { 12, 13, -12 }
734 }
735 }
736 },
737 {
738 .bpp = DSC_BPP(15), .bpc = 12,
739 { 273, 15, 2048, 11, 20, 19, 19, {
740 { 0, 4, 10 }, { 2, 7, 8 }, { 4, 9, 6 }, { 6, 11, 4 },
741 { 9, 11, 2 }, { 9, 11, 0 }, { 9, 12, -2 }, { 10, 12, -4 },
742 { 11, 13, -6 }, { 11, 13, -8 }, { 12, 14, -10 },
743 { 13, 15, -10 }, { 13, 15, -12 }, { 15, 16, -12 },
744 { 16, 17, -12 }
745 }
746 }
747 },
748 {
749 .bpp = DSC_BPP(15), .bpc = 14,
750 { 273, 15, 2048, 15, 24, 23, 23, {
751 { 0, 4, 10 }, { 3, 8, 8 }, { 6, 11, 6 }, { 9, 14, 4 },
752 { 13, 15, 2 }, { 13, 15, 0 }, { 13, 16, -2 }, { 14, 16, -4 },
753 { 15, 17, -6 }, { 15, 17, -8 }, { 16, 18, -10 },
754 { 17, 19, -10 }, { 17, 19, -12 }, { 19, 20, -12 },
755 { 20, 21, -12 }
756 }
757 }
758 },
759 {
760 .bpp = DSC_BPP(15), .bpc = 16,
761 { 273, 15, 2048, 19, 28, 27, 27, {
762 { 0, 4, 10 }, { 4, 9, 8 }, { 8, 13, 6 }, { 12, 17, 4 },
763 { 17, 19, 2 }, { 17, 20, 0 }, { 17, 20, -2 }, { 18, 20, -4 },
764 { 19, 21, -6 }, { 19, 21, -8 }, { 20, 22, -10 },
765 { 21, 23, -10 }, { 21, 23, -12 }, { 23, 24, -12 },
766 { 24, 25, -12 }
767 }
768 }
769 },
770 { /* sentinel */ }
771};
772
773/*
774 * Selected Rate Control Related Parameter Recommended Values for 4:2:2 from
775 * DSC v1.2, v1.2a, v1.2b
776 *
777 * Cross-checked against C Model releases: DSC_model_20161212 and 20210623
778 */
779static const struct rc_parameters_data rc_parameters_1_2_422[] = {
780 {
781 .bpp = DSC_BPP(6), .bpc = 8,
782 { 512, 15, 6144, 3, 12, 11, 11, {
783 { 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
784 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
785 { 3, 9, -8 }, { 3, 10, -10 }, { 5, 10, -10 }, { 5, 11, -12 },
786 { 5, 11, -12 }, { 9, 12, -12 }, { 12, 13, -12 }
787 }
788 }
789 },
790 {
791 .bpp = DSC_BPP(6), .bpc = 10,
792 { 512, 15, 6144, 7, 16, 15, 15, {
793 { 0, 8, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
794 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
795 { 7, 13, -8 }, { 7, 14, -10 }, { 9, 14, -10 }, { 9, 15, -12 },
796 { 9, 15, -12 }, { 13, 16, -12 }, { 16, 17, -12 }
797 }
798 }
799 },
800 {
801 .bpp = DSC_BPP(6), .bpc = 12,
802 { 512, 15, 6144, 11, 20, 19, 19, {
803 { 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
804 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
805 { 11, 17, -8 }, { 11, 18, -10 }, { 13, 18, -10 },
806 { 13, 19, -12 }, { 13, 19, -12 }, { 17, 20, -12 },
807 { 20, 21, -12 }
808 }
809 }
810 },
811 {
812 .bpp = DSC_BPP(6), .bpc = 14,
813 { 512, 15, 6144, 15, 24, 23, 23, {
814 { 0, 12, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 12, 17, -2 },
815 { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
816 { 15, 21, -8 }, { 15, 22, -10 }, { 17, 22, -10 },
817 { 17, 23, -12 }, { 17, 23, -12 }, { 21, 24, -12 },
818 { 24, 25, -12 }
819 }
820 }
821 },
822 {
823 .bpp = DSC_BPP(6), .bpc = 16,
824 { 512, 15, 6144, 19, 28, 27, 27, {
825 { 0, 12, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 15, 20, -2 },
826 { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
827 { 19, 25, -8 }, { 19, 26, -10 }, { 21, 26, -10 },
828 { 21, 27, -12 }, { 21, 27, -12 }, { 25, 28, -12 },
829 { 28, 29, -12 }
830 }
831 }
832 },
833 {
834 .bpp = DSC_BPP(7), .bpc = 8,
835 { 410, 15, 5632, 3, 12, 11, 11, {
836 { 0, 3, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 2, 6, -2 },
837 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
838 { 3, 9, -8 }, { 3, 9, -10 }, { 5, 10, -10 }, { 5, 10, -10 },
839 { 5, 11, -12 }, { 7, 11, -12 }, { 11, 12, -12 }
840 }
841 }
842 },
843 {
844 .bpp = DSC_BPP(7), .bpc = 10,
845 { 410, 15, 5632, 7, 16, 15, 15, {
846 { 0, 7, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 6, 10, -2 },
847 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
848 { 7, 13, -8 }, { 7, 13, -10 }, { 9, 14, -10 }, { 9, 14, -10 },
849 { 9, 15, -12 }, { 11, 15, -12 }, { 15, 16, -12 }
850 }
851 }
852 },
853 {
854 .bpp = DSC_BPP(7), .bpc = 12,
855 { 410, 15, 5632, 11, 20, 19, 19, {
856 { 0, 11, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 10, 14, -2 },
857 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
858 { 11, 17, -8 }, { 11, 17, -10 }, { 13, 18, -10 },
859 { 13, 18, -10 }, { 13, 19, -12 }, { 15, 19, -12 },
860 { 19, 20, -12 }
861 }
862 }
863 },
864 {
865 .bpp = DSC_BPP(7), .bpc = 14,
866 { 410, 15, 5632, 15, 24, 23, 23, {
867 { 0, 11, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 13, 18, -2 },
868 { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
869 { 15, 21, -8 }, { 15, 21, -10 }, { 17, 22, -10 },
870 { 17, 22, -10 }, { 17, 23, -12 }, { 19, 23, -12 },
871 { 23, 24, -12 }
872 }
873 }
874 },
875 {
876 .bpp = DSC_BPP(7), .bpc = 16,
877 { 410, 15, 5632, 19, 28, 27, 27, {
878 { 0, 11, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 16, 20, -2 },
879 { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
880 { 19, 25, -8 }, { 19, 25, -10 }, { 21, 26, -10 },
881 { 21, 26, -10 }, { 21, 27, -12 }, { 23, 27, -12 },
882 { 27, 28, -12 }
883 }
884 }
885 },
886 {
887 .bpp = DSC_BPP(8), .bpc = 8,
888 { 341, 15, 2048, 3, 12, 11, 11, {
889 { 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
890 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
891 { 3, 8, -8 }, { 3, 9, -10 }, { 5, 9, -10 }, { 5, 9, -12 },
892 { 5, 9, -12 }, { 7, 10, -12 }, { 10, 11, -12 }
893 }
894 }
895 },
896 {
897 .bpp = DSC_BPP(8), .bpc = 10,
898 { 341, 15, 2048, 7, 16, 15, 15, {
899 { 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
900 { 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
901 { 7, 12, -8 }, { 7, 13, -10 }, { 9, 13, -10 }, { 9, 13, -12 },
902 { 9, 13, -12 }, { 11, 14, -12 }, { 14, 15, -12 }
903 }
904 }
905 },
906 {
907 .bpp = DSC_BPP(8), .bpc = 12,
908 { 341, 15, 2048, 11, 20, 19, 19, {
909 { 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
910 { 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
911 { 11, 16, -8 }, { 11, 17, -10 }, { 13, 17, -10 },
912 { 13, 17, -12 }, { 13, 17, -12 }, { 15, 18, -12 },
913 { 18, 19, -12 }
914 }
915 }
916 },
917 {
918 .bpp = DSC_BPP(8), .bpc = 14,
919 { 341, 15, 2048, 15, 24, 23, 23, {
920 { 0, 6, 2 }, { 7, 10, 0 }, { 9, 13, 0 }, { 11, 16, -2 },
921 { 14, 17, -4 }, { 15, 18, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
922 { 15, 20, -8 }, { 15, 21, -10 }, { 17, 21, -10 },
923 { 17, 21, -12 }, { 17, 21, -12 }, { 19, 22, -12 },
924 { 22, 23, -12 }
925 }
926 }
927 },
928 {
929 .bpp = DSC_BPP(8), .bpc = 16,
930 { 341, 15, 2048, 19, 28, 27, 27, {
931 { 0, 6, 2 }, { 6, 11, 0 }, { 11, 15, 0 }, { 14, 18, -2 },
932 { 18, 21, -4 }, { 19, 22, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
933 { 19, 24, -8 }, { 19, 25, -10 }, { 21, 25, -10 },
934 { 21, 25, -12 }, { 21, 25, -12 }, { 23, 26, -12 },
935 { 26, 27, -12 }
936 }
937 }
938 },
939 {
940 .bpp = DSC_BPP(10), .bpc = 8,
941 { 273, 15, 2048, 3, 12, 11, 11, {
942 { 0, 0, 10 }, { 0, 1, 8 }, { 0, 1, 6 }, { 0, 2, 4 },
943 { 1, 2, 2 }, { 1, 3, 0 }, { 1, 3, -2 }, { 2, 4, -4 },
944 { 2, 5, -6 }, { 3, 5, -8 }, { 4, 6, -10 }, { 4, 7, -10 },
945 { 5, 7, -12 }, { 7, 8, -12 }, { 8, 9, -12 }
946 }
947 }
948 },
949 {
950 .bpp = DSC_BPP(10), .bpc = 10,
951 { 273, 15, 2048, 7, 16, 15, 15, {
952 { 0, 2, 10 }, { 2, 5, 8 }, { 3, 5, 6 }, { 4, 6, 4 },
953 { 5, 6, 2 }, { 5, 7, 0 }, { 5, 7, -2 }, { 6, 8, -4 },
954 { 6, 9, -6 }, { 7, 9, -8 }, { 8, 10, -10 }, { 8, 11, -10 },
955 { 9, 11, -12 }, { 11, 12, -12 }, { 12, 13, -12 }
956 }
957 }
958 },
959 {
960 .bpp = DSC_BPP(10), .bpc = 12,
961 { 273, 15, 2048, 11, 20, 19, 19, {
962 { 0, 4, 10 }, { 2, 7, 8 }, { 4, 9, 6 }, { 6, 11, 4 },
963 { 9, 11, 2 }, { 9, 11, 0 }, { 9, 12, -2 }, { 10, 12, -4 },
964 { 11, 13, -6 }, { 11, 13, -8 }, { 12, 14, -10 },
965 { 13, 15, -10 }, { 13, 15, -12 }, { 15, 16, -12 },
966 { 16, 17, -12 }
967 }
968 }
969 },
970 {
971 .bpp = DSC_BPP(10), .bpc = 14,
972 { 273, 15, 2048, 15, 24, 23, 23, {
973 { 0, 4, 10 }, { 3, 8, 8 }, { 6, 11, 6 }, { 9, 14, 4 },
974 { 13, 15, 2 }, { 13, 15, 0 }, { 13, 16, -2 }, { 14, 16, -4 },
975 { 15, 17, -6 }, { 15, 17, -8 }, { 16, 18, -10 },
976 { 17, 19, -10 }, { 17, 19, -12 }, { 19, 20, -12 },
977 { 20, 21, -12 }
978 }
979 }
980 },
981 {
982 .bpp = DSC_BPP(10), .bpc = 16,
983 { 273, 15, 2048, 19, 28, 27, 27, {
984 { 0, 4, 10 }, { 4, 9, 8 }, { 8, 13, 6 }, { 12, 17, 4 },
985 { 17, 19, 2 }, { 17, 20, 0 }, { 17, 20, -2 }, { 18, 20, -4 },
986 { 19, 21, -6 }, { 19, 21, -8 }, { 20, 22, -10 },
987 { 21, 23, -10 }, { 21, 23, -12 }, { 23, 24, -12 },
988 { 24, 25, -12 }
989 }
990 }
991 },
992 { /* sentinel */ }
993};
994
995/*
996 * Selected Rate Control Related Parameter Recommended Values for 4:2:2 from
997 * DSC v1.2, v1.2a, v1.2b
998 *
999 * Cross-checked against C Model releases: DSC_model_20161212 and 20210623
1000 */
1001static const struct rc_parameters_data rc_parameters_1_2_420[] = {
1002 {
1003 .bpp = DSC_BPP(4), .bpc = 8,
1004 { 512, 12, 6144, 3, 12, 11, 11, {
1005 { 0, 4, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
1006 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
1007 { 3, 9, -8 }, { 3, 10, -10 }, { 5, 10, -10 }, { 5, 11, -12 },
1008 { 5, 11, -12 }, { 9, 12, -12 }, { 12, 13, -12 }
1009 }
1010 }
1011 },
1012 {
1013 .bpp = DSC_BPP(4), .bpc = 10,
1014 { 512, 12, 6144, 7, 16, 15, 15, {
1015 { 0, 8, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 5, 10, -2 },
1016 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
1017 { 7, 13, -8 }, { 7, 14, -10 }, { 9, 14, -10 }, { 9, 15, -12 },
1018 { 9, 15, -12 }, { 13, 16, -12 }, { 16, 17, -12 }
1019 }
1020 }
1021 },
1022 {
1023 .bpp = DSC_BPP(4), .bpc = 12,
1024 { 512, 12, 6144, 11, 20, 19, 19, {
1025 { 0, 12, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 9, 14, -2 },
1026 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
1027 { 11, 17, -8 }, { 11, 18, -10 }, { 13, 18, -10 },
1028 { 13, 19, -12 }, { 13, 19, -12 }, { 17, 20, -12 },
1029 { 20, 21, -12 }
1030 }
1031 }
1032 },
1033 {
1034 .bpp = DSC_BPP(4), .bpc = 14,
1035 { 512, 12, 6144, 15, 24, 23, 23, {
1036 { 0, 12, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 12, 17, -2 },
1037 { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
1038 { 15, 21, -8 }, { 15, 22, -10 }, { 17, 22, -10 },
1039 { 17, 23, -12 }, { 17, 23, -12 }, { 21, 24, -12 },
1040 { 24, 25, -12 }
1041 }
1042 }
1043 },
1044 {
1045 .bpp = DSC_BPP(4), .bpc = 16,
1046 { 512, 12, 6144, 19, 28, 27, 27, {
1047 { 0, 12, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 15, 20, -2 },
1048 { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
1049 { 19, 25, -8 }, { 19, 26, -10 }, { 21, 26, -10 },
1050 { 21, 27, -12 }, { 21, 27, -12 }, { 25, 28, -12 },
1051 { 28, 29, -12 }
1052 }
1053 }
1054 },
1055 {
1056 .bpp = DSC_BPP(5), .bpc = 8,
1057 { 410, 15, 5632, 3, 12, 11, 11, {
1058 { 0, 3, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 2, 6, -2 },
1059 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
1060 { 3, 9, -8 }, { 3, 9, -10 }, { 5, 10, -10 }, { 5, 10, -10 },
1061 { 5, 11, -12 }, { 7, 11, -12 }, { 11, 12, -12 }
1062 }
1063 }
1064 },
1065 {
1066 .bpp = DSC_BPP(5), .bpc = 10,
1067 { 410, 15, 5632, 7, 16, 15, 15, {
1068 { 0, 7, 2 }, { 4, 8, 0 }, { 5, 9, 0 }, { 6, 10, -2 },
1069 { 7, 11, -4 }, { 7, 11, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
1070 { 7, 13, -8 }, { 7, 13, -10 }, { 9, 14, -10 }, { 9, 14, -10 },
1071 { 9, 15, -12 }, { 11, 15, -12 }, { 15, 16, -12 }
1072 }
1073 }
1074 },
1075 {
1076 .bpp = DSC_BPP(5), .bpc = 12,
1077 { 410, 15, 5632, 11, 20, 19, 19, {
1078 { 0, 11, 2 }, { 4, 12, 0 }, { 9, 13, 0 }, { 10, 14, -2 },
1079 { 11, 15, -4 }, { 11, 15, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
1080 { 11, 17, -8 }, { 11, 17, -10 }, { 13, 18, -10 },
1081 { 13, 18, -10 }, { 13, 19, -12 }, { 15, 19, -12 },
1082 { 19, 20, -12 }
1083 }
1084 }
1085 },
1086 {
1087 .bpp = DSC_BPP(5), .bpc = 14,
1088 { 410, 15, 5632, 15, 24, 23, 23, {
1089 { 0, 11, 2 }, { 5, 13, 0 }, { 11, 15, 0 }, { 13, 18, -2 },
1090 { 15, 19, -4 }, { 15, 19, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
1091 { 15, 21, -8 }, { 15, 21, -10 }, { 17, 22, -10 },
1092 { 17, 22, -10 }, { 17, 23, -12 }, { 19, 23, -12 },
1093 { 23, 24, -12 }
1094 }
1095 }
1096 },
1097 {
1098 .bpp = DSC_BPP(5), .bpc = 16,
1099 { 410, 15, 5632, 19, 28, 27, 27, {
1100 { 0, 11, 2 }, { 6, 14, 0 }, { 13, 17, 0 }, { 16, 20, -2 },
1101 { 19, 23, -4 }, { 19, 23, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
1102 { 19, 25, -8 }, { 19, 25, -10 }, { 21, 26, -10 },
1103 { 21, 26, -10 }, { 21, 27, -12 }, { 23, 27, -12 },
1104 { 27, 28, -12 }
1105 }
1106 }
1107 },
1108 {
1109 .bpp = DSC_BPP(6), .bpc = 8,
1110 { 341, 15, 2048, 3, 12, 11, 11, {
1111 { 0, 2, 2 }, { 0, 4, 0 }, { 1, 5, 0 }, { 1, 6, -2 },
1112 { 3, 7, -4 }, { 3, 7, -6 }, { 3, 7, -8 }, { 3, 8, -8 },
1113 { 3, 8, -8 }, { 3, 9, -10 }, { 5, 9, -10 }, { 5, 9, -12 },
1114 { 5, 9, -12 }, { 7, 10, -12 }, { 10, 12, -12 }
1115 }
1116 }
1117 },
1118 {
1119 .bpp = DSC_BPP(6), .bpc = 10,
1120 { 341, 15, 2048, 7, 16, 15, 15, {
1121 { 0, 2, 2 }, { 2, 5, 0 }, { 3, 7, 0 }, { 4, 8, -2 },
1122 { 6, 9, -4 }, { 7, 10, -6 }, { 7, 11, -8 }, { 7, 12, -8 },
1123 { 7, 12, -8 }, { 7, 13, -10 }, { 9, 13, -10 }, { 9, 13, -12 },
1124 { 9, 13, -12 }, { 11, 14, -12 }, { 14, 15, -12 }
1125 }
1126 }
1127 },
1128 {
1129 .bpp = DSC_BPP(6), .bpc = 12,
1130 { 341, 15, 2048, 11, 20, 19, 19, {
1131 { 0, 6, 2 }, { 4, 9, 0 }, { 7, 11, 0 }, { 8, 12, -2 },
1132 { 10, 13, -4 }, { 11, 14, -6 }, { 11, 15, -8 }, { 11, 16, -8 },
1133 { 11, 16, -8 }, { 11, 17, -10 }, { 13, 17, -10 },
1134 { 13, 17, -12 }, { 13, 17, -12 }, { 15, 18, -12 },
1135 { 18, 19, -12 }
1136 }
1137 }
1138 },
1139 {
1140 .bpp = DSC_BPP(6), .bpc = 14,
1141 { 341, 15, 2048, 15, 24, 23, 23, {
1142 { 0, 6, 2 }, { 7, 10, 0 }, { 9, 13, 0 }, { 11, 16, -2 },
1143 { 14, 17, -4 }, { 15, 18, -6 }, { 15, 19, -8 }, { 15, 20, -8 },
1144 { 15, 20, -8 }, { 15, 21, -10 }, { 17, 21, -10 },
1145 { 17, 21, -12 }, { 17, 21, -12 }, { 19, 22, -12 },
1146 { 22, 23, -12 }
1147 }
1148 }
1149 },
1150 {
1151 .bpp = DSC_BPP(6), .bpc = 16,
1152 { 341, 15, 2048, 19, 28, 27, 27, {
1153 { 0, 6, 2 }, { 6, 11, 0 }, { 11, 15, 0 }, { 14, 18, -2 },
1154 { 18, 21, -4 }, { 19, 22, -6 }, { 19, 23, -8 }, { 19, 24, -8 },
1155 { 19, 24, -8 }, { 19, 25, -10 }, { 21, 25, -10 },
1156 { 21, 25, -12 }, { 21, 25, -12 }, { 23, 26, -12 },
1157 { 26, 27, -12 }
1158 }
1159 }
1160 },
1161 {
1162 .bpp = DSC_BPP(8), .bpc = 8,
1163 { 256, 15, 2048, 3, 12, 11, 11, {
1164 { 0, 0, 10 }, { 0, 1, 8 }, { 0, 1, 6 }, { 0, 2, 4 },
1165 { 1, 2, 2 }, { 1, 3, 0 }, { 1, 3, -2 }, { 2, 4, -4 },
1166 { 2, 5, -6 }, { 3, 5, -8 }, { 4, 6, -10 }, { 4, 7, -10 },
1167 { 5, 7, -12 }, { 7, 8, -12 }, { 8, 9, -12 }
1168 }
1169 }
1170 },
1171 {
1172 .bpp = DSC_BPP(8), .bpc = 10,
1173 { 256, 15, 2048, 7, 16, 15, 15, {
1174 { 0, 2, 10 }, { 2, 5, 8 }, { 3, 5, 6 }, { 4, 6, 4 },
1175 { 5, 6, 2 }, { 5, 7, 0 }, { 5, 7, -2 }, { 6, 8, -4 },
1176 { 6, 9, -6 }, { 7, 9, -8 }, { 8, 10, -10 }, { 8, 11, -10 },
1177 { 9, 11, -12 }, { 11, 12, -12 }, { 12, 13, -12 }
1178 }
1179 }
1180 },
1181 {
1182 .bpp = DSC_BPP(8), .bpc = 12,
1183 { 256, 15, 2048, 11, 20, 19, 19, {
1184 { 0, 4, 10 }, { 2, 7, 8 }, { 4, 9, 6 }, { 6, 11, 4 },
1185 { 9, 11, 2 }, { 9, 11, 0 }, { 9, 12, -2 }, { 10, 12, -4 },
1186 { 11, 13, -6 }, { 11, 13, -8 }, { 12, 14, -10 },
1187 { 13, 15, -10 }, { 13, 15, -12 }, { 15, 16, -12 },
1188 { 16, 17, -12 }
1189 }
1190 }
1191 },
1192 {
1193 .bpp = DSC_BPP(8), .bpc = 14,
1194 { 256, 15, 2048, 15, 24, 23, 23, {
1195 { 0, 4, 10 }, { 3, 8, 8 }, { 6, 11, 6 }, { 9, 14, 4 },
1196 { 13, 15, 2 }, { 13, 15, 0 }, { 13, 16, -2 }, { 14, 16, -4 },
1197 { 15, 17, -6 }, { 15, 17, -8 }, { 16, 18, -10 },
1198 { 17, 19, -10 }, { 17, 19, -12 }, { 19, 20, -12 },
1199 { 20, 21, -12 }
1200 }
1201 }
1202 },
1203 {
1204 .bpp = DSC_BPP(8), .bpc = 16,
1205 { 256, 15, 2048, 19, 28, 27, 27, {
1206 { 0, 4, 10 }, { 4, 9, 8 }, { 8, 13, 6 }, { 12, 17, 4 },
1207 { 17, 19, 2 }, { 17, 20, 0 }, { 17, 20, -2 }, { 18, 20, -4 },
1208 { 19, 21, -6 }, { 19, 21, -8 }, { 20, 22, -10 },
1209 { 21, 23, -10 }, { 21, 23, -12 }, { 23, 24, -12 },
1210 { 24, 25, -12 }
1211 }
1212 }
1213 },
1214 { /* sentinel */ }
1215};
1216
1217static const struct rc_parameters *get_rc_params(const struct rc_parameters_data *rc_parameters,
1218 u16 dsc_bpp,
1219 u8 bits_per_component)
1220{
1221 int i;
1222
1223 for (i = 0; rc_parameters[i].bpp; i++)
1224 if (rc_parameters[i].bpp == dsc_bpp &&
1225 rc_parameters[i].bpc == bits_per_component)
1226 return &rc_parameters[i].params;
1227
1228 return NULL;
1229}
1230
1231/**
1232 * drm_dsc_setup_rc_params() - Set parameters and limits for RC model in
1233 * accordance with the DSC 1.1 or 1.2 specification and DSC C Model
1234 * Required bits_per_pixel and bits_per_component to be set before calling this
1235 * function.
1236 *
1237 * @vdsc_cfg: DSC Configuration data partially filled by driver
1238 * @type: operating mode and standard to follow
1239 *
1240 * Return: 0 or -error code in case of an error
1241 */
1242int drm_dsc_setup_rc_params(struct drm_dsc_config *vdsc_cfg, enum drm_dsc_params_type type)
1243{
1244 const struct rc_parameters_data *data;
1245 const struct rc_parameters *rc_params;
1246 int i;
1247
1248 if (WARN_ON_ONCE(!vdsc_cfg->bits_per_pixel ||
1249 !vdsc_cfg->bits_per_component))
1250 return -EINVAL;
1251
1252 switch (type) {
1253 case DRM_DSC_1_2_444:
1254 data = rc_parameters_1_2_444;
1255 break;
1256 case DRM_DSC_1_1_PRE_SCR:
1257 data = rc_parameters_pre_scr;
1258 break;
1259 case DRM_DSC_1_2_422:
1260 data = rc_parameters_1_2_422;
1261 break;
1262 case DRM_DSC_1_2_420:
1263 data = rc_parameters_1_2_420;
1264 break;
1265 default:
1266 return -EINVAL;
1267 }
1268
1269 rc_params = get_rc_params(data,
1270 vdsc_cfg->bits_per_pixel,
1271 vdsc_cfg->bits_per_component);
1272 if (!rc_params)
1273 return -EINVAL;
1274
1275 vdsc_cfg->first_line_bpg_offset = rc_params->first_line_bpg_offset;
1276 vdsc_cfg->initial_xmit_delay = rc_params->initial_xmit_delay;
1277 vdsc_cfg->initial_offset = rc_params->initial_offset;
1278 vdsc_cfg->flatness_min_qp = rc_params->flatness_min_qp;
1279 vdsc_cfg->flatness_max_qp = rc_params->flatness_max_qp;
1280 vdsc_cfg->rc_quant_incr_limit0 = rc_params->rc_quant_incr_limit0;
1281 vdsc_cfg->rc_quant_incr_limit1 = rc_params->rc_quant_incr_limit1;
1282
1283 for (i = 0; i < DSC_NUM_BUF_RANGES; i++) {
1284 vdsc_cfg->rc_range_params[i].range_min_qp =
1285 rc_params->rc_range_params[i].range_min_qp;
1286 vdsc_cfg->rc_range_params[i].range_max_qp =
1287 rc_params->rc_range_params[i].range_max_qp;
1288 /*
1289 * Range BPG Offset uses 2's complement and is only a 6 bits. So
1290 * mask it to get only 6 bits.
1291 */
1292 vdsc_cfg->rc_range_params[i].range_bpg_offset =
1293 rc_params->rc_range_params[i].range_bpg_offset &
1294 DSC_RANGE_BPG_OFFSET_MASK;
1295 }
1296
1297 return 0;
1298}
1299EXPORT_SYMBOL(drm_dsc_setup_rc_params);
1300
1301/**
1302 * drm_dsc_compute_rc_parameters() - Write rate control
1303 * parameters to the dsc configuration defined in
1304 * &struct drm_dsc_config in accordance with the DSC 1.2
1305 * specification. Some configuration fields must be present
1306 * beforehand.
1307 *
1308 * @vdsc_cfg:
1309 * DSC Configuration data partially filled by driver
1310 */
1311int drm_dsc_compute_rc_parameters(struct drm_dsc_config *vdsc_cfg)
1312{
1313 unsigned long groups_per_line = 0;
1314 unsigned long groups_total = 0;
1315 unsigned long num_extra_mux_bits = 0;
1316 unsigned long slice_bits = 0;
1317 unsigned long hrd_delay = 0;
1318 unsigned long final_scale = 0;
1319 unsigned long rbs_min = 0;
1320
1321 if (vdsc_cfg->native_420 || vdsc_cfg->native_422) {
1322 /* Number of groups used to code each line of a slice */
1323 groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width / 2,
1324 DSC_RC_PIXELS_PER_GROUP);
1325
1326 /* chunksize in Bytes */
1327 vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width / 2 *
1328 vdsc_cfg->bits_per_pixel,
1329 (8 * 16));
1330 } else {
1331 /* Number of groups used to code each line of a slice */
1332 groups_per_line = DIV_ROUND_UP(vdsc_cfg->slice_width,
1333 DSC_RC_PIXELS_PER_GROUP);
1334
1335 /* chunksize in Bytes */
1336 vdsc_cfg->slice_chunk_size = DIV_ROUND_UP(vdsc_cfg->slice_width *
1337 vdsc_cfg->bits_per_pixel,
1338 (8 * 16));
1339 }
1340
1341 if (vdsc_cfg->convert_rgb)
1342 num_extra_mux_bits = 3 * (vdsc_cfg->mux_word_size +
1343 (4 * vdsc_cfg->bits_per_component + 4)
1344 - 2);
1345 else if (vdsc_cfg->native_422)
1346 num_extra_mux_bits = 4 * vdsc_cfg->mux_word_size +
1347 (4 * vdsc_cfg->bits_per_component + 4) +
1348 3 * (4 * vdsc_cfg->bits_per_component) - 2;
1349 else
1350 num_extra_mux_bits = 3 * vdsc_cfg->mux_word_size +
1351 (4 * vdsc_cfg->bits_per_component + 4) +
1352 2 * (4 * vdsc_cfg->bits_per_component) - 2;
1353 /* Number of bits in one Slice */
1354 slice_bits = 8 * vdsc_cfg->slice_chunk_size * vdsc_cfg->slice_height;
1355
1356 while ((num_extra_mux_bits > 0) &&
1357 ((slice_bits - num_extra_mux_bits) % vdsc_cfg->mux_word_size))
1358 num_extra_mux_bits--;
1359
1360 if (groups_per_line < vdsc_cfg->initial_scale_value - 8)
1361 vdsc_cfg->initial_scale_value = groups_per_line + 8;
1362
1363 /* scale_decrement_interval calculation according to DSC spec 1.11 */
1364 if (vdsc_cfg->initial_scale_value > 8)
1365 vdsc_cfg->scale_decrement_interval = groups_per_line /
1366 (vdsc_cfg->initial_scale_value - 8);
1367 else
1368 vdsc_cfg->scale_decrement_interval = DSC_SCALE_DECREMENT_INTERVAL_MAX;
1369
1370 vdsc_cfg->final_offset = vdsc_cfg->rc_model_size -
1371 (vdsc_cfg->initial_xmit_delay *
1372 vdsc_cfg->bits_per_pixel + 8) / 16 + num_extra_mux_bits;
1373
1374 if (vdsc_cfg->final_offset >= vdsc_cfg->rc_model_size) {
1375 DRM_DEBUG_KMS("FinalOfs < RcModelSze for this InitialXmitDelay\n");
1376 return -ERANGE;
1377 }
1378
1379 final_scale = (vdsc_cfg->rc_model_size * 8) /
1380 (vdsc_cfg->rc_model_size - vdsc_cfg->final_offset);
1381 if (vdsc_cfg->slice_height > 1)
1382 /*
1383 * NflBpgOffset is 16 bit value with 11 fractional bits
1384 * hence we multiply by 2^11 for preserving the
1385 * fractional part
1386 */
1387 vdsc_cfg->nfl_bpg_offset = DIV_ROUND_UP((vdsc_cfg->first_line_bpg_offset << 11),
1388 (vdsc_cfg->slice_height - 1));
1389 else
1390 vdsc_cfg->nfl_bpg_offset = 0;
1391
1392 /* Number of groups used to code the entire slice */
1393 groups_total = groups_per_line * vdsc_cfg->slice_height;
1394
1395 /* slice_bpg_offset is 16 bit value with 11 fractional bits */
1396 vdsc_cfg->slice_bpg_offset = DIV_ROUND_UP(((vdsc_cfg->rc_model_size -
1397 vdsc_cfg->initial_offset +
1398 num_extra_mux_bits) << 11),
1399 groups_total);
1400
1401 if (final_scale > 9) {
1402 /*
1403 * ScaleIncrementInterval =
1404 * finaloffset/((NflBpgOffset + SliceBpgOffset)*8(finalscale - 1.125))
1405 * as (NflBpgOffset + SliceBpgOffset) has 11 bit fractional value,
1406 * we need divide by 2^11 from pstDscCfg values
1407 */
1408 vdsc_cfg->scale_increment_interval =
1409 (vdsc_cfg->final_offset * (1 << 11)) /
1410 ((vdsc_cfg->nfl_bpg_offset +
1411 vdsc_cfg->slice_bpg_offset) *
1412 (final_scale - 9));
1413 } else {
1414 /*
1415 * If finalScaleValue is less than or equal to 9, a value of 0 should
1416 * be used to disable the scale increment at the end of the slice
1417 */
1418 vdsc_cfg->scale_increment_interval = 0;
1419 }
1420
1421 /*
1422 * DSC spec mentions that bits_per_pixel specifies the target
1423 * bits/pixel (bpp) rate that is used by the encoder,
1424 * in steps of 1/16 of a bit per pixel
1425 */
1426 rbs_min = vdsc_cfg->rc_model_size - vdsc_cfg->initial_offset +
1427 DIV_ROUND_UP(vdsc_cfg->initial_xmit_delay *
1428 vdsc_cfg->bits_per_pixel, 16) +
1429 groups_per_line * vdsc_cfg->first_line_bpg_offset;
1430
1431 hrd_delay = DIV_ROUND_UP((rbs_min * 16), vdsc_cfg->bits_per_pixel);
1432 vdsc_cfg->rc_bits = (hrd_delay * vdsc_cfg->bits_per_pixel) / 16;
1433 vdsc_cfg->initial_dec_delay = hrd_delay - vdsc_cfg->initial_xmit_delay;
1434
1435 return 0;
1436}
1437EXPORT_SYMBOL(drm_dsc_compute_rc_parameters);
1438
1439/**
1440 * drm_dsc_get_bpp_int() - Get integer bits per pixel value for the given DRM DSC config
1441 * @vdsc_cfg: Pointer to DRM DSC config struct
1442 *
1443 * Return: Integer BPP value
1444 */
1445u32 drm_dsc_get_bpp_int(const struct drm_dsc_config *vdsc_cfg)
1446{
1447 WARN_ON_ONCE(vdsc_cfg->bits_per_pixel & 0xf);
1448 return vdsc_cfg->bits_per_pixel >> 4;
1449}
1450EXPORT_SYMBOL(drm_dsc_get_bpp_int);
1451
1452/**
1453 * drm_dsc_initial_scale_value() - Calculate the initial scale value for the given DSC config
1454 * @dsc: Pointer to DRM DSC config struct
1455 *
1456 * Return: Calculated initial scale value
1457 */
1458u8 drm_dsc_initial_scale_value(const struct drm_dsc_config *dsc)
1459{
1460 return 8 * dsc->rc_model_size / (dsc->rc_model_size - dsc->initial_offset);
1461}
1462EXPORT_SYMBOL(drm_dsc_initial_scale_value);
1463
1464/**
1465 * drm_dsc_flatness_det_thresh() - Calculate the flatness_det_thresh for the given DSC config
1466 * @dsc: Pointer to DRM DSC config struct
1467 *
1468 * Return: Calculated flatness det thresh value
1469 */
1470u32 drm_dsc_flatness_det_thresh(const struct drm_dsc_config *dsc)
1471{
1472 return 2 << (dsc->bits_per_component - 8);
1473}
1474EXPORT_SYMBOL(drm_dsc_flatness_det_thresh);