1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012-2020, The Linux Foundation. All rights reserved.
4 */
5
6 #define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
7
8 #include <linux/types.h>
9 #include <linux/completion.h>
10 #include <linux/delay.h>
11 #include <linux/phy/phy.h>
12 #include <linux/phy/phy-dp.h>
13 #include <linux/pm_opp.h>
14
15 #include <drm/display/drm_dp_helper.h>
16 #include <drm/drm_fixed.h>
17 #include <drm/drm_print.h>
18
19 #include "dp_reg.h"
20 #include "dp_ctrl.h"
21 #include "dp_link.h"
22
23 #define DP_KHZ_TO_HZ 1000
24 #define IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES (30 * HZ / 1000) /* 30 ms */
25 #define PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES (300 * HZ / 1000) /* 300 ms */
26 #define WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES (HZ / 2)
27
28 #define DP_CTRL_INTR_READY_FOR_VIDEO BIT(0)
29 #define DP_CTRL_INTR_IDLE_PATTERN_SENT BIT(3)
30
31 #define MR_LINK_TRAINING1 0x8
32 #define MR_LINK_SYMBOL_ERM 0x80
33 #define MR_LINK_PRBS7 0x100
34 #define MR_LINK_CUSTOM80 0x200
35 #define MR_LINK_TRAINING4 0x40
36
37 enum {
38 DP_TRAINING_NONE,
39 DP_TRAINING_1,
40 DP_TRAINING_2,
41 };
42
43 struct dp_tu_calc_input {
44 u64 lclk; /* 162, 270, 540 and 810 */
45 u64 pclk_khz; /* in KHz */
46 u64 hactive; /* active h-width */
47 u64 hporch; /* bp + fp + pulse */
48 int nlanes; /* no.of.lanes */
49 int bpp; /* bits */
50 int pixel_enc; /* 444, 420, 422 */
51 int dsc_en; /* dsc on/off */
52 int async_en; /* async mode */
53 int fec_en; /* fec */
54 int compress_ratio; /* 2:1 = 200, 3:1 = 300, 3.75:1 = 375 */
55 int num_of_dsc_slices; /* number of slices per line */
56 };
57
58 struct dp_vc_tu_mapping_table {
59 u32 vic;
60 u8 lanes;
61 u8 lrate; /* DP_LINK_RATE -> 162(6), 270(10), 540(20), 810 (30) */
62 u8 bpp;
63 u8 valid_boundary_link;
64 u16 delay_start_link;
65 bool boundary_moderation_en;
66 u8 valid_lower_boundary_link;
67 u8 upper_boundary_count;
68 u8 lower_boundary_count;
69 u8 tu_size_minus1;
70 };
71
72 struct dp_ctrl_private {
73 struct dp_ctrl dp_ctrl;
74 struct drm_device *drm_dev;
75 struct device *dev;
76 struct drm_dp_aux *aux;
77 struct dp_panel *panel;
78 struct dp_link *link;
79 struct dp_catalog *catalog;
80
81 struct phy *phy;
82
83 unsigned int num_core_clks;
84 struct clk_bulk_data *core_clks;
85
86 unsigned int num_link_clks;
87 struct clk_bulk_data *link_clks;
88
89 struct clk *pixel_clk;
90
91 union phy_configure_opts phy_opts;
92
93 struct completion idle_comp;
94 struct completion psr_op_comp;
95 struct completion video_comp;
96
97 bool core_clks_on;
98 bool link_clks_on;
99 bool stream_clks_on;
100 };
101
dp_aux_link_configure(struct drm_dp_aux * aux,struct dp_link_info * link)102 static int dp_aux_link_configure(struct drm_dp_aux *aux,
103 struct dp_link_info *link)
104 {
105 u8 values[2];
106 int err;
107
108 values[0] = drm_dp_link_rate_to_bw_code(link->rate);
109 values[1] = link->num_lanes;
110
111 if (link->capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
112 values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
113
114 err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
115 if (err < 0)
116 return err;
117
118 return 0;
119 }
120
dp_ctrl_push_idle(struct dp_ctrl * dp_ctrl)121 void dp_ctrl_push_idle(struct dp_ctrl *dp_ctrl)
122 {
123 struct dp_ctrl_private *ctrl;
124
125 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
126
127 reinit_completion(&ctrl->idle_comp);
128 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_PUSH_IDLE);
129
130 if (!wait_for_completion_timeout(&ctrl->idle_comp,
131 IDLE_PATTERN_COMPLETION_TIMEOUT_JIFFIES))
132 pr_warn("PUSH_IDLE pattern timedout\n");
133
134 drm_dbg_dp(ctrl->drm_dev, "mainlink off\n");
135 }
136
dp_ctrl_config_ctrl(struct dp_ctrl_private * ctrl)137 static void dp_ctrl_config_ctrl(struct dp_ctrl_private *ctrl)
138 {
139 u32 config = 0, tbd;
140 const u8 *dpcd = ctrl->panel->dpcd;
141
142 /* Default-> LSCLK DIV: 1/4 LCLK */
143 config |= (2 << DP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT);
144
145 if (ctrl->panel->dp_mode.out_fmt_is_yuv_420)
146 config |= DP_CONFIGURATION_CTRL_RGB_YUV; /* YUV420 */
147
148 /* Scrambler reset enable */
149 if (drm_dp_alternate_scrambler_reset_cap(dpcd))
150 config |= DP_CONFIGURATION_CTRL_ASSR;
151
152 tbd = dp_link_get_test_bits_depth(ctrl->link,
153 ctrl->panel->dp_mode.bpp);
154
155 config |= tbd << DP_CONFIGURATION_CTRL_BPC_SHIFT;
156
157 /* Num of Lanes */
158 config |= ((ctrl->link->link_params.num_lanes - 1)
159 << DP_CONFIGURATION_CTRL_NUM_OF_LANES_SHIFT);
160
161 if (drm_dp_enhanced_frame_cap(dpcd))
162 config |= DP_CONFIGURATION_CTRL_ENHANCED_FRAMING;
163
164 config |= DP_CONFIGURATION_CTRL_P_INTERLACED; /* progressive video */
165
166 /* sync clock & static Mvid */
167 config |= DP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN;
168 config |= DP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK;
169
170 if (ctrl->panel->psr_cap.version)
171 config |= DP_CONFIGURATION_CTRL_SEND_VSC;
172
173 dp_catalog_ctrl_config_ctrl(ctrl->catalog, config);
174 }
175
dp_ctrl_configure_source_params(struct dp_ctrl_private * ctrl)176 static void dp_ctrl_configure_source_params(struct dp_ctrl_private *ctrl)
177 {
178 u32 cc, tb;
179
180 dp_catalog_ctrl_lane_mapping(ctrl->catalog);
181 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);
182 dp_catalog_setup_peripheral_flush(ctrl->catalog);
183
184 dp_ctrl_config_ctrl(ctrl);
185
186 tb = dp_link_get_test_bits_depth(ctrl->link,
187 ctrl->panel->dp_mode.bpp);
188 cc = dp_link_get_colorimetry_config(ctrl->link);
189 dp_catalog_ctrl_config_misc(ctrl->catalog, cc, tb);
190 dp_panel_timing_cfg(ctrl->panel);
191 }
192
193 /*
194 * The structure and few functions present below are IP/Hardware
195 * specific implementation. Most of the implementation will not
196 * have coding comments
197 */
198 struct tu_algo_data {
199 s64 lclk_fp;
200 s64 pclk_fp;
201 s64 lwidth;
202 s64 lwidth_fp;
203 s64 hbp_relative_to_pclk;
204 s64 hbp_relative_to_pclk_fp;
205 int nlanes;
206 int bpp;
207 int pixelEnc;
208 int dsc_en;
209 int async_en;
210 int bpc;
211
212 uint delay_start_link_extra_pixclk;
213 int extra_buffer_margin;
214 s64 ratio_fp;
215 s64 original_ratio_fp;
216
217 s64 err_fp;
218 s64 n_err_fp;
219 s64 n_n_err_fp;
220 int tu_size;
221 int tu_size_desired;
222 int tu_size_minus1;
223
224 int valid_boundary_link;
225 s64 resulting_valid_fp;
226 s64 total_valid_fp;
227 s64 effective_valid_fp;
228 s64 effective_valid_recorded_fp;
229 int n_tus;
230 int n_tus_per_lane;
231 int paired_tus;
232 int remainder_tus;
233 int remainder_tus_upper;
234 int remainder_tus_lower;
235 int extra_bytes;
236 int filler_size;
237 int delay_start_link;
238
239 int extra_pclk_cycles;
240 int extra_pclk_cycles_in_link_clk;
241 s64 ratio_by_tu_fp;
242 s64 average_valid2_fp;
243 int new_valid_boundary_link;
244 int remainder_symbols_exist;
245 int n_symbols;
246 s64 n_remainder_symbols_per_lane_fp;
247 s64 last_partial_tu_fp;
248 s64 TU_ratio_err_fp;
249
250 int n_tus_incl_last_incomplete_tu;
251 int extra_pclk_cycles_tmp;
252 int extra_pclk_cycles_in_link_clk_tmp;
253 int extra_required_bytes_new_tmp;
254 int filler_size_tmp;
255 int lower_filler_size_tmp;
256 int delay_start_link_tmp;
257
258 bool boundary_moderation_en;
259 int boundary_mod_lower_err;
260 int upper_boundary_count;
261 int lower_boundary_count;
262 int i_upper_boundary_count;
263 int i_lower_boundary_count;
264 int valid_lower_boundary_link;
265 int even_distribution_BF;
266 int even_distribution_legacy;
267 int even_distribution;
268 int min_hblank_violated;
269 s64 delay_start_time_fp;
270 s64 hbp_time_fp;
271 s64 hactive_time_fp;
272 s64 diff_abs_fp;
273
274 s64 ratio;
275 };
276
_tu_param_compare(s64 a,s64 b)277 static int _tu_param_compare(s64 a, s64 b)
278 {
279 u32 a_sign;
280 u32 b_sign;
281 s64 a_temp, b_temp, minus_1;
282
283 if (a == b)
284 return 0;
285
286 minus_1 = drm_fixp_from_fraction(-1, 1);
287
288 a_sign = (a >> 32) & 0x80000000 ? 1 : 0;
289
290 b_sign = (b >> 32) & 0x80000000 ? 1 : 0;
291
292 if (a_sign > b_sign)
293 return 2;
294 else if (b_sign > a_sign)
295 return 1;
296
297 if (!a_sign && !b_sign) { /* positive */
298 if (a > b)
299 return 1;
300 else
301 return 2;
302 } else { /* negative */
303 a_temp = drm_fixp_mul(a, minus_1);
304 b_temp = drm_fixp_mul(b, minus_1);
305
306 if (a_temp > b_temp)
307 return 2;
308 else
309 return 1;
310 }
311 }
312
dp_panel_update_tu_timings(struct dp_tu_calc_input * in,struct tu_algo_data * tu)313 static void dp_panel_update_tu_timings(struct dp_tu_calc_input *in,
314 struct tu_algo_data *tu)
315 {
316 int nlanes = in->nlanes;
317 int dsc_num_slices = in->num_of_dsc_slices;
318 int dsc_num_bytes = 0;
319 int numerator;
320 s64 pclk_dsc_fp;
321 s64 dwidth_dsc_fp;
322 s64 hbp_dsc_fp;
323
324 int tot_num_eoc_symbols = 0;
325 int tot_num_hor_bytes = 0;
326 int tot_num_dummy_bytes = 0;
327 int dwidth_dsc_bytes = 0;
328 int eoc_bytes = 0;
329
330 s64 temp1_fp, temp2_fp, temp3_fp;
331
332 tu->lclk_fp = drm_fixp_from_fraction(in->lclk, 1);
333 tu->pclk_fp = drm_fixp_from_fraction(in->pclk_khz, 1000);
334 tu->lwidth = in->hactive;
335 tu->hbp_relative_to_pclk = in->hporch;
336 tu->nlanes = in->nlanes;
337 tu->bpp = in->bpp;
338 tu->pixelEnc = in->pixel_enc;
339 tu->dsc_en = in->dsc_en;
340 tu->async_en = in->async_en;
341 tu->lwidth_fp = drm_fixp_from_fraction(in->hactive, 1);
342 tu->hbp_relative_to_pclk_fp = drm_fixp_from_fraction(in->hporch, 1);
343
344 if (tu->pixelEnc == 420) {
345 temp1_fp = drm_fixp_from_fraction(2, 1);
346 tu->pclk_fp = drm_fixp_div(tu->pclk_fp, temp1_fp);
347 tu->lwidth_fp = drm_fixp_div(tu->lwidth_fp, temp1_fp);
348 tu->hbp_relative_to_pclk_fp =
349 drm_fixp_div(tu->hbp_relative_to_pclk_fp, 2);
350 }
351
352 if (tu->pixelEnc == 422) {
353 switch (tu->bpp) {
354 case 24:
355 tu->bpp = 16;
356 tu->bpc = 8;
357 break;
358 case 30:
359 tu->bpp = 20;
360 tu->bpc = 10;
361 break;
362 default:
363 tu->bpp = 16;
364 tu->bpc = 8;
365 break;
366 }
367 } else {
368 tu->bpc = tu->bpp/3;
369 }
370
371 if (!in->dsc_en)
372 goto fec_check;
373
374 temp1_fp = drm_fixp_from_fraction(in->compress_ratio, 100);
375 temp2_fp = drm_fixp_from_fraction(in->bpp, 1);
376 temp3_fp = drm_fixp_div(temp2_fp, temp1_fp);
377 temp2_fp = drm_fixp_mul(tu->lwidth_fp, temp3_fp);
378
379 temp1_fp = drm_fixp_from_fraction(8, 1);
380 temp3_fp = drm_fixp_div(temp2_fp, temp1_fp);
381
382 numerator = drm_fixp2int(temp3_fp);
383
384 dsc_num_bytes = numerator / dsc_num_slices;
385 eoc_bytes = dsc_num_bytes % nlanes;
386 tot_num_eoc_symbols = nlanes * dsc_num_slices;
387 tot_num_hor_bytes = dsc_num_bytes * dsc_num_slices;
388 tot_num_dummy_bytes = (nlanes - eoc_bytes) * dsc_num_slices;
389
390 if (dsc_num_bytes == 0)
391 pr_info("incorrect no of bytes per slice=%d\n", dsc_num_bytes);
392
393 dwidth_dsc_bytes = (tot_num_hor_bytes +
394 tot_num_eoc_symbols +
395 (eoc_bytes == 0 ? 0 : tot_num_dummy_bytes));
396
397 dwidth_dsc_fp = drm_fixp_from_fraction(dwidth_dsc_bytes, 3);
398
399 temp2_fp = drm_fixp_mul(tu->pclk_fp, dwidth_dsc_fp);
400 temp1_fp = drm_fixp_div(temp2_fp, tu->lwidth_fp);
401 pclk_dsc_fp = temp1_fp;
402
403 temp1_fp = drm_fixp_div(pclk_dsc_fp, tu->pclk_fp);
404 temp2_fp = drm_fixp_mul(tu->hbp_relative_to_pclk_fp, temp1_fp);
405 hbp_dsc_fp = temp2_fp;
406
407 /* output */
408 tu->pclk_fp = pclk_dsc_fp;
409 tu->lwidth_fp = dwidth_dsc_fp;
410 tu->hbp_relative_to_pclk_fp = hbp_dsc_fp;
411
412 fec_check:
413 if (in->fec_en) {
414 temp1_fp = drm_fixp_from_fraction(976, 1000); /* 0.976 */
415 tu->lclk_fp = drm_fixp_mul(tu->lclk_fp, temp1_fp);
416 }
417 }
418
_tu_valid_boundary_calc(struct tu_algo_data * tu)419 static void _tu_valid_boundary_calc(struct tu_algo_data *tu)
420 {
421 s64 temp1_fp, temp2_fp, temp, temp1, temp2;
422 int compare_result_1, compare_result_2, compare_result_3;
423
424 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
425 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
426
427 tu->new_valid_boundary_link = drm_fixp2int_ceil(temp2_fp);
428
429 temp = (tu->i_upper_boundary_count *
430 tu->new_valid_boundary_link +
431 tu->i_lower_boundary_count *
432 (tu->new_valid_boundary_link-1));
433 tu->average_valid2_fp = drm_fixp_from_fraction(temp,
434 (tu->i_upper_boundary_count +
435 tu->i_lower_boundary_count));
436
437 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
438 temp2_fp = tu->lwidth_fp;
439 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
440 temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp);
441 tu->n_tus = drm_fixp2int(temp2_fp);
442 if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000)
443 tu->n_tus += 1;
444
445 temp1_fp = drm_fixp_from_fraction(tu->n_tus, 1);
446 temp2_fp = drm_fixp_mul(temp1_fp, tu->average_valid2_fp);
447 temp1_fp = drm_fixp_from_fraction(tu->n_symbols, 1);
448 temp2_fp = temp1_fp - temp2_fp;
449 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
450 temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
451 tu->n_remainder_symbols_per_lane_fp = temp2_fp;
452
453 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
454 tu->last_partial_tu_fp =
455 drm_fixp_div(tu->n_remainder_symbols_per_lane_fp,
456 temp1_fp);
457
458 if (tu->n_remainder_symbols_per_lane_fp != 0)
459 tu->remainder_symbols_exist = 1;
460 else
461 tu->remainder_symbols_exist = 0;
462
463 temp1_fp = drm_fixp_from_fraction(tu->n_tus, tu->nlanes);
464 tu->n_tus_per_lane = drm_fixp2int(temp1_fp);
465
466 tu->paired_tus = (int)((tu->n_tus_per_lane) /
467 (tu->i_upper_boundary_count +
468 tu->i_lower_boundary_count));
469
470 tu->remainder_tus = tu->n_tus_per_lane - tu->paired_tus *
471 (tu->i_upper_boundary_count +
472 tu->i_lower_boundary_count);
473
474 if ((tu->remainder_tus - tu->i_upper_boundary_count) > 0) {
475 tu->remainder_tus_upper = tu->i_upper_boundary_count;
476 tu->remainder_tus_lower = tu->remainder_tus -
477 tu->i_upper_boundary_count;
478 } else {
479 tu->remainder_tus_upper = tu->remainder_tus;
480 tu->remainder_tus_lower = 0;
481 }
482
483 temp = tu->paired_tus * (tu->i_upper_boundary_count *
484 tu->new_valid_boundary_link +
485 tu->i_lower_boundary_count *
486 (tu->new_valid_boundary_link - 1)) +
487 (tu->remainder_tus_upper *
488 tu->new_valid_boundary_link) +
489 (tu->remainder_tus_lower *
490 (tu->new_valid_boundary_link - 1));
491 tu->total_valid_fp = drm_fixp_from_fraction(temp, 1);
492
493 if (tu->remainder_symbols_exist) {
494 temp1_fp = tu->total_valid_fp +
495 tu->n_remainder_symbols_per_lane_fp;
496 temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1);
497 temp2_fp = temp2_fp + tu->last_partial_tu_fp;
498 temp1_fp = drm_fixp_div(temp1_fp, temp2_fp);
499 } else {
500 temp2_fp = drm_fixp_from_fraction(tu->n_tus_per_lane, 1);
501 temp1_fp = drm_fixp_div(tu->total_valid_fp, temp2_fp);
502 }
503 tu->effective_valid_fp = temp1_fp;
504
505 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
506 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
507 tu->n_n_err_fp = tu->effective_valid_fp - temp2_fp;
508
509 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
510 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
511 tu->n_err_fp = tu->average_valid2_fp - temp2_fp;
512
513 tu->even_distribution = tu->n_tus % tu->nlanes == 0 ? 1 : 0;
514
515 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
516 temp2_fp = tu->lwidth_fp;
517 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
518 temp2_fp = drm_fixp_div(temp1_fp, tu->average_valid2_fp);
519
520 if (temp2_fp)
521 tu->n_tus_incl_last_incomplete_tu = drm_fixp2int_ceil(temp2_fp);
522 else
523 tu->n_tus_incl_last_incomplete_tu = 0;
524
525 temp1 = 0;
526 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
527 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
528 temp1_fp = tu->average_valid2_fp - temp2_fp;
529 temp2_fp = drm_fixp_from_fraction(tu->n_tus_incl_last_incomplete_tu, 1);
530 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
531
532 if (temp1_fp)
533 temp1 = drm_fixp2int_ceil(temp1_fp);
534
535 temp = tu->i_upper_boundary_count * tu->nlanes;
536 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
537 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
538 temp1_fp = drm_fixp_from_fraction(tu->new_valid_boundary_link, 1);
539 temp2_fp = temp1_fp - temp2_fp;
540 temp1_fp = drm_fixp_from_fraction(temp, 1);
541 temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);
542
543 if (temp2_fp)
544 temp2 = drm_fixp2int_ceil(temp2_fp);
545 else
546 temp2 = 0;
547 tu->extra_required_bytes_new_tmp = (int)(temp1 + temp2);
548
549 temp1_fp = drm_fixp_from_fraction(8, tu->bpp);
550 temp2_fp = drm_fixp_from_fraction(
551 tu->extra_required_bytes_new_tmp, 1);
552 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
553
554 if (temp1_fp)
555 tu->extra_pclk_cycles_tmp = drm_fixp2int_ceil(temp1_fp);
556 else
557 tu->extra_pclk_cycles_tmp = 0;
558
559 temp1_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles_tmp, 1);
560 temp2_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
561 temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp);
562
563 if (temp1_fp)
564 tu->extra_pclk_cycles_in_link_clk_tmp =
565 drm_fixp2int_ceil(temp1_fp);
566 else
567 tu->extra_pclk_cycles_in_link_clk_tmp = 0;
568
569 tu->filler_size_tmp = tu->tu_size - tu->new_valid_boundary_link;
570
571 tu->lower_filler_size_tmp = tu->filler_size_tmp + 1;
572
573 tu->delay_start_link_tmp = tu->extra_pclk_cycles_in_link_clk_tmp +
574 tu->lower_filler_size_tmp +
575 tu->extra_buffer_margin;
576
577 temp1_fp = drm_fixp_from_fraction(tu->delay_start_link_tmp, 1);
578 tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);
579
580 compare_result_1 = _tu_param_compare(tu->n_n_err_fp, tu->diff_abs_fp);
581 if (compare_result_1 == 2)
582 compare_result_1 = 1;
583 else
584 compare_result_1 = 0;
585
586 compare_result_2 = _tu_param_compare(tu->n_n_err_fp, tu->err_fp);
587 if (compare_result_2 == 2)
588 compare_result_2 = 1;
589 else
590 compare_result_2 = 0;
591
592 compare_result_3 = _tu_param_compare(tu->hbp_time_fp,
593 tu->delay_start_time_fp);
594 if (compare_result_3 == 2)
595 compare_result_3 = 0;
596 else
597 compare_result_3 = 1;
598
599 if (((tu->even_distribution == 1) ||
600 ((tu->even_distribution_BF == 0) &&
601 (tu->even_distribution_legacy == 0))) &&
602 tu->n_err_fp >= 0 && tu->n_n_err_fp >= 0 &&
603 compare_result_2 &&
604 (compare_result_1 || (tu->min_hblank_violated == 1)) &&
605 (tu->new_valid_boundary_link - 1) > 0 &&
606 compare_result_3 &&
607 (tu->delay_start_link_tmp <= 1023)) {
608 tu->upper_boundary_count = tu->i_upper_boundary_count;
609 tu->lower_boundary_count = tu->i_lower_boundary_count;
610 tu->err_fp = tu->n_n_err_fp;
611 tu->boundary_moderation_en = true;
612 tu->tu_size_desired = tu->tu_size;
613 tu->valid_boundary_link = tu->new_valid_boundary_link;
614 tu->effective_valid_recorded_fp = tu->effective_valid_fp;
615 tu->even_distribution_BF = 1;
616 tu->delay_start_link = tu->delay_start_link_tmp;
617 } else if (tu->boundary_mod_lower_err == 0) {
618 compare_result_1 = _tu_param_compare(tu->n_n_err_fp,
619 tu->diff_abs_fp);
620 if (compare_result_1 == 2)
621 tu->boundary_mod_lower_err = 1;
622 }
623 }
624
_dp_ctrl_calc_tu(struct dp_ctrl_private * ctrl,struct dp_tu_calc_input * in,struct dp_vc_tu_mapping_table * tu_table)625 static void _dp_ctrl_calc_tu(struct dp_ctrl_private *ctrl,
626 struct dp_tu_calc_input *in,
627 struct dp_vc_tu_mapping_table *tu_table)
628 {
629 struct tu_algo_data *tu;
630 int compare_result_1, compare_result_2;
631 u64 temp = 0;
632 s64 temp_fp = 0, temp1_fp = 0, temp2_fp = 0;
633
634 s64 LCLK_FAST_SKEW_fp = drm_fixp_from_fraction(6, 10000); /* 0.0006 */
635 s64 const_p49_fp = drm_fixp_from_fraction(49, 100); /* 0.49 */
636 s64 const_p56_fp = drm_fixp_from_fraction(56, 100); /* 0.56 */
637 s64 RATIO_SCALE_fp = drm_fixp_from_fraction(1001, 1000);
638
639 u8 DP_BRUTE_FORCE = 1;
640 s64 BRUTE_FORCE_THRESHOLD_fp = drm_fixp_from_fraction(1, 10); /* 0.1 */
641 uint EXTRA_PIXCLK_CYCLE_DELAY = 4;
642 uint HBLANK_MARGIN = 4;
643
644 tu = kzalloc(sizeof(*tu), GFP_KERNEL);
645 if (!tu)
646 return;
647
648 dp_panel_update_tu_timings(in, tu);
649
650 tu->err_fp = drm_fixp_from_fraction(1000, 1); /* 1000 */
651
652 temp1_fp = drm_fixp_from_fraction(4, 1);
653 temp2_fp = drm_fixp_mul(temp1_fp, tu->lclk_fp);
654 temp_fp = drm_fixp_div(temp2_fp, tu->pclk_fp);
655 tu->extra_buffer_margin = drm_fixp2int_ceil(temp_fp);
656
657 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
658 temp2_fp = drm_fixp_mul(tu->pclk_fp, temp1_fp);
659 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
660 temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
661 tu->ratio_fp = drm_fixp_div(temp2_fp, tu->lclk_fp);
662
663 tu->original_ratio_fp = tu->ratio_fp;
664 tu->boundary_moderation_en = false;
665 tu->upper_boundary_count = 0;
666 tu->lower_boundary_count = 0;
667 tu->i_upper_boundary_count = 0;
668 tu->i_lower_boundary_count = 0;
669 tu->valid_lower_boundary_link = 0;
670 tu->even_distribution_BF = 0;
671 tu->even_distribution_legacy = 0;
672 tu->even_distribution = 0;
673 tu->delay_start_time_fp = 0;
674
675 tu->err_fp = drm_fixp_from_fraction(1000, 1);
676 tu->n_err_fp = 0;
677 tu->n_n_err_fp = 0;
678
679 tu->ratio = drm_fixp2int(tu->ratio_fp);
680 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
681 div64_u64_rem(tu->lwidth_fp, temp1_fp, &temp2_fp);
682 if (temp2_fp != 0 &&
683 !tu->ratio && tu->dsc_en == 0) {
684 tu->ratio_fp = drm_fixp_mul(tu->ratio_fp, RATIO_SCALE_fp);
685 tu->ratio = drm_fixp2int(tu->ratio_fp);
686 if (tu->ratio)
687 tu->ratio_fp = drm_fixp_from_fraction(1, 1);
688 }
689
690 if (tu->ratio > 1)
691 tu->ratio = 1;
692
693 if (tu->ratio == 1)
694 goto tu_size_calc;
695
696 compare_result_1 = _tu_param_compare(tu->ratio_fp, const_p49_fp);
697 if (!compare_result_1 || compare_result_1 == 1)
698 compare_result_1 = 1;
699 else
700 compare_result_1 = 0;
701
702 compare_result_2 = _tu_param_compare(tu->ratio_fp, const_p56_fp);
703 if (!compare_result_2 || compare_result_2 == 2)
704 compare_result_2 = 1;
705 else
706 compare_result_2 = 0;
707
708 if (tu->dsc_en && compare_result_1 && compare_result_2) {
709 HBLANK_MARGIN += 4;
710 drm_dbg_dp(ctrl->drm_dev,
711 "increase HBLANK_MARGIN to %d\n", HBLANK_MARGIN);
712 }
713
714 tu_size_calc:
715 for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) {
716 temp1_fp = drm_fixp_from_fraction(tu->tu_size, 1);
717 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
718 temp = drm_fixp2int_ceil(temp2_fp);
719 temp1_fp = drm_fixp_from_fraction(temp, 1);
720 tu->n_err_fp = temp1_fp - temp2_fp;
721
722 if (tu->n_err_fp < tu->err_fp) {
723 tu->err_fp = tu->n_err_fp;
724 tu->tu_size_desired = tu->tu_size;
725 }
726 }
727
728 tu->tu_size_minus1 = tu->tu_size_desired - 1;
729
730 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
731 temp2_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
732 tu->valid_boundary_link = drm_fixp2int_ceil(temp2_fp);
733
734 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
735 temp2_fp = tu->lwidth_fp;
736 temp2_fp = drm_fixp_mul(temp2_fp, temp1_fp);
737
738 temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1);
739 temp2_fp = drm_fixp_div(temp2_fp, temp1_fp);
740 tu->n_tus = drm_fixp2int(temp2_fp);
741 if ((temp2_fp & 0xFFFFFFFF) > 0xFFFFF000)
742 tu->n_tus += 1;
743
744 tu->even_distribution_legacy = tu->n_tus % tu->nlanes == 0 ? 1 : 0;
745
746 drm_dbg_dp(ctrl->drm_dev,
747 "n_sym = %d, num_of_tus = %d\n",
748 tu->valid_boundary_link, tu->n_tus);
749
750 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
751 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
752 temp1_fp = drm_fixp_from_fraction(tu->valid_boundary_link, 1);
753 temp2_fp = temp1_fp - temp2_fp;
754 temp1_fp = drm_fixp_from_fraction(tu->n_tus + 1, 1);
755 temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);
756
757 temp = drm_fixp2int(temp2_fp);
758 if (temp && temp2_fp)
759 tu->extra_bytes = drm_fixp2int_ceil(temp2_fp);
760 else
761 tu->extra_bytes = 0;
762
763 temp1_fp = drm_fixp_from_fraction(tu->extra_bytes, 1);
764 temp2_fp = drm_fixp_from_fraction(8, tu->bpp);
765 temp1_fp = drm_fixp_mul(temp1_fp, temp2_fp);
766
767 if (temp && temp1_fp)
768 tu->extra_pclk_cycles = drm_fixp2int_ceil(temp1_fp);
769 else
770 tu->extra_pclk_cycles = drm_fixp2int(temp1_fp);
771
772 temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
773 temp2_fp = drm_fixp_from_fraction(tu->extra_pclk_cycles, 1);
774 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
775
776 if (temp1_fp)
777 tu->extra_pclk_cycles_in_link_clk = drm_fixp2int_ceil(temp1_fp);
778 else
779 tu->extra_pclk_cycles_in_link_clk = drm_fixp2int(temp1_fp);
780
781 tu->filler_size = tu->tu_size_desired - tu->valid_boundary_link;
782
783 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
784 tu->ratio_by_tu_fp = drm_fixp_mul(tu->ratio_fp, temp1_fp);
785
786 tu->delay_start_link = tu->extra_pclk_cycles_in_link_clk +
787 tu->filler_size + tu->extra_buffer_margin;
788
789 tu->resulting_valid_fp =
790 drm_fixp_from_fraction(tu->valid_boundary_link, 1);
791
792 temp1_fp = drm_fixp_from_fraction(tu->tu_size_desired, 1);
793 temp2_fp = drm_fixp_div(tu->resulting_valid_fp, temp1_fp);
794 tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp;
795
796 temp1_fp = drm_fixp_from_fraction(HBLANK_MARGIN, 1);
797 temp1_fp = tu->hbp_relative_to_pclk_fp - temp1_fp;
798 tu->hbp_time_fp = drm_fixp_div(temp1_fp, tu->pclk_fp);
799
800 temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1);
801 tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);
802
803 compare_result_1 = _tu_param_compare(tu->hbp_time_fp,
804 tu->delay_start_time_fp);
805 if (compare_result_1 == 2) /* if (hbp_time_fp < delay_start_time_fp) */
806 tu->min_hblank_violated = 1;
807
808 tu->hactive_time_fp = drm_fixp_div(tu->lwidth_fp, tu->pclk_fp);
809
810 compare_result_2 = _tu_param_compare(tu->hactive_time_fp,
811 tu->delay_start_time_fp);
812 if (compare_result_2 == 2)
813 tu->min_hblank_violated = 1;
814
815 tu->delay_start_time_fp = 0;
816
817 /* brute force */
818
819 tu->delay_start_link_extra_pixclk = EXTRA_PIXCLK_CYCLE_DELAY;
820 tu->diff_abs_fp = tu->resulting_valid_fp - tu->ratio_by_tu_fp;
821
822 temp = drm_fixp2int(tu->diff_abs_fp);
823 if (!temp && tu->diff_abs_fp <= 0xffff)
824 tu->diff_abs_fp = 0;
825
826 /* if(diff_abs < 0) diff_abs *= -1 */
827 if (tu->diff_abs_fp < 0)
828 tu->diff_abs_fp = drm_fixp_mul(tu->diff_abs_fp, -1);
829
830 tu->boundary_mod_lower_err = 0;
831 if ((tu->diff_abs_fp != 0 &&
832 ((tu->diff_abs_fp > BRUTE_FORCE_THRESHOLD_fp) ||
833 (tu->even_distribution_legacy == 0) ||
834 (DP_BRUTE_FORCE == 1))) ||
835 (tu->min_hblank_violated == 1)) {
836 do {
837 tu->err_fp = drm_fixp_from_fraction(1000, 1);
838
839 temp1_fp = drm_fixp_div(tu->lclk_fp, tu->pclk_fp);
840 temp2_fp = drm_fixp_from_fraction(
841 tu->delay_start_link_extra_pixclk, 1);
842 temp1_fp = drm_fixp_mul(temp2_fp, temp1_fp);
843
844 if (temp1_fp)
845 tu->extra_buffer_margin =
846 drm_fixp2int_ceil(temp1_fp);
847 else
848 tu->extra_buffer_margin = 0;
849
850 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
851 temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp);
852
853 if (temp1_fp)
854 tu->n_symbols = drm_fixp2int_ceil(temp1_fp);
855 else
856 tu->n_symbols = 0;
857
858 for (tu->tu_size = 32; tu->tu_size <= 64; tu->tu_size++) {
859 for (tu->i_upper_boundary_count = 1;
860 tu->i_upper_boundary_count <= 15;
861 tu->i_upper_boundary_count++) {
862 for (tu->i_lower_boundary_count = 1;
863 tu->i_lower_boundary_count <= 15;
864 tu->i_lower_boundary_count++) {
865 _tu_valid_boundary_calc(tu);
866 }
867 }
868 }
869 tu->delay_start_link_extra_pixclk--;
870 } while (tu->boundary_moderation_en != true &&
871 tu->boundary_mod_lower_err == 1 &&
872 tu->delay_start_link_extra_pixclk != 0);
873
874 if (tu->boundary_moderation_en == true) {
875 temp1_fp = drm_fixp_from_fraction(
876 (tu->upper_boundary_count *
877 tu->valid_boundary_link +
878 tu->lower_boundary_count *
879 (tu->valid_boundary_link - 1)), 1);
880 temp2_fp = drm_fixp_from_fraction(
881 (tu->upper_boundary_count +
882 tu->lower_boundary_count), 1);
883 tu->resulting_valid_fp =
884 drm_fixp_div(temp1_fp, temp2_fp);
885
886 temp1_fp = drm_fixp_from_fraction(
887 tu->tu_size_desired, 1);
888 tu->ratio_by_tu_fp =
889 drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
890
891 tu->valid_lower_boundary_link =
892 tu->valid_boundary_link - 1;
893
894 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
895 temp1_fp = drm_fixp_mul(tu->lwidth_fp, temp1_fp);
896 temp2_fp = drm_fixp_div(temp1_fp,
897 tu->resulting_valid_fp);
898 tu->n_tus = drm_fixp2int(temp2_fp);
899
900 tu->tu_size_minus1 = tu->tu_size_desired - 1;
901 tu->even_distribution_BF = 1;
902
903 temp1_fp =
904 drm_fixp_from_fraction(tu->tu_size_desired, 1);
905 temp2_fp =
906 drm_fixp_div(tu->resulting_valid_fp, temp1_fp);
907 tu->TU_ratio_err_fp = temp2_fp - tu->original_ratio_fp;
908 }
909 }
910
911 temp2_fp = drm_fixp_mul(LCLK_FAST_SKEW_fp, tu->lwidth_fp);
912
913 if (temp2_fp)
914 temp = drm_fixp2int_ceil(temp2_fp);
915 else
916 temp = 0;
917
918 temp1_fp = drm_fixp_from_fraction(tu->nlanes, 1);
919 temp2_fp = drm_fixp_mul(tu->original_ratio_fp, temp1_fp);
920 temp1_fp = drm_fixp_from_fraction(tu->bpp, 8);
921 temp2_fp = drm_fixp_div(temp1_fp, temp2_fp);
922 temp1_fp = drm_fixp_from_fraction(temp, 1);
923 temp2_fp = drm_fixp_mul(temp1_fp, temp2_fp);
924 temp = drm_fixp2int(temp2_fp);
925
926 if (tu->async_en)
927 tu->delay_start_link += (int)temp;
928
929 temp1_fp = drm_fixp_from_fraction(tu->delay_start_link, 1);
930 tu->delay_start_time_fp = drm_fixp_div(temp1_fp, tu->lclk_fp);
931
932 /* OUTPUTS */
933 tu_table->valid_boundary_link = tu->valid_boundary_link;
934 tu_table->delay_start_link = tu->delay_start_link;
935 tu_table->boundary_moderation_en = tu->boundary_moderation_en;
936 tu_table->valid_lower_boundary_link = tu->valid_lower_boundary_link;
937 tu_table->upper_boundary_count = tu->upper_boundary_count;
938 tu_table->lower_boundary_count = tu->lower_boundary_count;
939 tu_table->tu_size_minus1 = tu->tu_size_minus1;
940
941 drm_dbg_dp(ctrl->drm_dev, "TU: valid_boundary_link: %d\n",
942 tu_table->valid_boundary_link);
943 drm_dbg_dp(ctrl->drm_dev, "TU: delay_start_link: %d\n",
944 tu_table->delay_start_link);
945 drm_dbg_dp(ctrl->drm_dev, "TU: boundary_moderation_en: %d\n",
946 tu_table->boundary_moderation_en);
947 drm_dbg_dp(ctrl->drm_dev, "TU: valid_lower_boundary_link: %d\n",
948 tu_table->valid_lower_boundary_link);
949 drm_dbg_dp(ctrl->drm_dev, "TU: upper_boundary_count: %d\n",
950 tu_table->upper_boundary_count);
951 drm_dbg_dp(ctrl->drm_dev, "TU: lower_boundary_count: %d\n",
952 tu_table->lower_boundary_count);
953 drm_dbg_dp(ctrl->drm_dev, "TU: tu_size_minus1: %d\n",
954 tu_table->tu_size_minus1);
955
956 kfree(tu);
957 }
958
dp_ctrl_calc_tu_parameters(struct dp_ctrl_private * ctrl,struct dp_vc_tu_mapping_table * tu_table)959 static void dp_ctrl_calc_tu_parameters(struct dp_ctrl_private *ctrl,
960 struct dp_vc_tu_mapping_table *tu_table)
961 {
962 struct dp_tu_calc_input in;
963 struct drm_display_mode *drm_mode;
964
965 drm_mode = &ctrl->panel->dp_mode.drm_mode;
966
967 in.lclk = ctrl->link->link_params.rate / 1000;
968 in.pclk_khz = drm_mode->clock;
969 in.hactive = drm_mode->hdisplay;
970 in.hporch = drm_mode->htotal - drm_mode->hdisplay;
971 in.nlanes = ctrl->link->link_params.num_lanes;
972 in.bpp = ctrl->panel->dp_mode.bpp;
973 in.pixel_enc = ctrl->panel->dp_mode.out_fmt_is_yuv_420 ? 420 : 444;
974 in.dsc_en = 0;
975 in.async_en = 0;
976 in.fec_en = 0;
977 in.num_of_dsc_slices = 0;
978 in.compress_ratio = 100;
979
980 _dp_ctrl_calc_tu(ctrl, &in, tu_table);
981 }
982
dp_ctrl_setup_tr_unit(struct dp_ctrl_private * ctrl)983 static void dp_ctrl_setup_tr_unit(struct dp_ctrl_private *ctrl)
984 {
985 u32 dp_tu = 0x0;
986 u32 valid_boundary = 0x0;
987 u32 valid_boundary2 = 0x0;
988 struct dp_vc_tu_mapping_table tu_calc_table;
989
990 dp_ctrl_calc_tu_parameters(ctrl, &tu_calc_table);
991
992 dp_tu |= tu_calc_table.tu_size_minus1;
993 valid_boundary |= tu_calc_table.valid_boundary_link;
994 valid_boundary |= (tu_calc_table.delay_start_link << 16);
995
996 valid_boundary2 |= (tu_calc_table.valid_lower_boundary_link << 1);
997 valid_boundary2 |= (tu_calc_table.upper_boundary_count << 16);
998 valid_boundary2 |= (tu_calc_table.lower_boundary_count << 20);
999
1000 if (tu_calc_table.boundary_moderation_en)
1001 valid_boundary2 |= BIT(0);
1002
1003 pr_debug("dp_tu=0x%x, valid_boundary=0x%x, valid_boundary2=0x%x\n",
1004 dp_tu, valid_boundary, valid_boundary2);
1005
1006 dp_catalog_ctrl_update_transfer_unit(ctrl->catalog,
1007 dp_tu, valid_boundary, valid_boundary2);
1008 }
1009
dp_ctrl_wait4video_ready(struct dp_ctrl_private * ctrl)1010 static int dp_ctrl_wait4video_ready(struct dp_ctrl_private *ctrl)
1011 {
1012 int ret = 0;
1013
1014 if (!wait_for_completion_timeout(&ctrl->video_comp,
1015 WAIT_FOR_VIDEO_READY_TIMEOUT_JIFFIES)) {
1016 DRM_ERROR("wait4video timedout\n");
1017 ret = -ETIMEDOUT;
1018 }
1019 return ret;
1020 }
1021
dp_ctrl_set_vx_px(struct dp_ctrl_private * ctrl,u8 v_level,u8 p_level)1022 static int dp_ctrl_set_vx_px(struct dp_ctrl_private *ctrl,
1023 u8 v_level, u8 p_level)
1024 {
1025 union phy_configure_opts *phy_opts = &ctrl->phy_opts;
1026
1027 /* TODO: Update for all lanes instead of just first one */
1028 phy_opts->dp.voltage[0] = v_level;
1029 phy_opts->dp.pre[0] = p_level;
1030 phy_opts->dp.set_voltages = 1;
1031 phy_configure(ctrl->phy, phy_opts);
1032 phy_opts->dp.set_voltages = 0;
1033
1034 return 0;
1035 }
1036
dp_ctrl_update_vx_px(struct dp_ctrl_private * ctrl)1037 static int dp_ctrl_update_vx_px(struct dp_ctrl_private *ctrl)
1038 {
1039 struct dp_link *link = ctrl->link;
1040 int ret = 0, lane, lane_cnt;
1041 u8 buf[4];
1042 u32 max_level_reached = 0;
1043 u32 voltage_swing_level = link->phy_params.v_level;
1044 u32 pre_emphasis_level = link->phy_params.p_level;
1045
1046 drm_dbg_dp(ctrl->drm_dev,
1047 "voltage level: %d emphasis level: %d\n",
1048 voltage_swing_level, pre_emphasis_level);
1049 ret = dp_ctrl_set_vx_px(ctrl,
1050 voltage_swing_level, pre_emphasis_level);
1051
1052 if (ret)
1053 return ret;
1054
1055 if (voltage_swing_level >= DP_TRAIN_LEVEL_MAX) {
1056 drm_dbg_dp(ctrl->drm_dev,
1057 "max. voltage swing level reached %d\n",
1058 voltage_swing_level);
1059 max_level_reached |= DP_TRAIN_MAX_SWING_REACHED;
1060 }
1061
1062 if (pre_emphasis_level >= DP_TRAIN_LEVEL_MAX) {
1063 drm_dbg_dp(ctrl->drm_dev,
1064 "max. pre-emphasis level reached %d\n",
1065 pre_emphasis_level);
1066 max_level_reached |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
1067 }
1068
1069 pre_emphasis_level <<= DP_TRAIN_PRE_EMPHASIS_SHIFT;
1070
1071 lane_cnt = ctrl->link->link_params.num_lanes;
1072 for (lane = 0; lane < lane_cnt; lane++)
1073 buf[lane] = voltage_swing_level | pre_emphasis_level
1074 | max_level_reached;
1075
1076 drm_dbg_dp(ctrl->drm_dev, "sink: p|v=0x%x\n",
1077 voltage_swing_level | pre_emphasis_level);
1078 ret = drm_dp_dpcd_write(ctrl->aux, DP_TRAINING_LANE0_SET,
1079 buf, lane_cnt);
1080 if (ret == lane_cnt)
1081 ret = 0;
1082
1083 return ret;
1084 }
1085
dp_ctrl_train_pattern_set(struct dp_ctrl_private * ctrl,u8 pattern)1086 static bool dp_ctrl_train_pattern_set(struct dp_ctrl_private *ctrl,
1087 u8 pattern)
1088 {
1089 u8 buf;
1090 int ret = 0;
1091
1092 drm_dbg_dp(ctrl->drm_dev, "sink: pattern=%x\n", pattern);
1093
1094 buf = pattern;
1095
1096 if (pattern && pattern != DP_TRAINING_PATTERN_4)
1097 buf |= DP_LINK_SCRAMBLING_DISABLE;
1098
1099 ret = drm_dp_dpcd_writeb(ctrl->aux, DP_TRAINING_PATTERN_SET, buf);
1100 return ret == 1;
1101 }
1102
dp_ctrl_read_link_status(struct dp_ctrl_private * ctrl,u8 * link_status)1103 static int dp_ctrl_read_link_status(struct dp_ctrl_private *ctrl,
1104 u8 *link_status)
1105 {
1106 int ret = 0, len;
1107
1108 len = drm_dp_dpcd_read_link_status(ctrl->aux, link_status);
1109 if (len != DP_LINK_STATUS_SIZE) {
1110 DRM_ERROR("DP link status read failed, err: %d\n", len);
1111 ret = -EINVAL;
1112 }
1113
1114 return ret;
1115 }
1116
dp_ctrl_link_train_1(struct dp_ctrl_private * ctrl,int * training_step)1117 static int dp_ctrl_link_train_1(struct dp_ctrl_private *ctrl,
1118 int *training_step)
1119 {
1120 int tries, old_v_level, ret = 0;
1121 u8 link_status[DP_LINK_STATUS_SIZE];
1122 int const maximum_retries = 4;
1123
1124 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
1125
1126 *training_step = DP_TRAINING_1;
1127
1128 ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, 1);
1129 if (ret)
1130 return ret;
1131 dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_1 |
1132 DP_LINK_SCRAMBLING_DISABLE);
1133
1134 ret = dp_ctrl_update_vx_px(ctrl);
1135 if (ret)
1136 return ret;
1137
1138 tries = 0;
1139 old_v_level = ctrl->link->phy_params.v_level;
1140 for (tries = 0; tries < maximum_retries; tries++) {
1141 drm_dp_link_train_clock_recovery_delay(ctrl->aux, ctrl->panel->dpcd);
1142
1143 ret = dp_ctrl_read_link_status(ctrl, link_status);
1144 if (ret)
1145 return ret;
1146
1147 if (drm_dp_clock_recovery_ok(link_status,
1148 ctrl->link->link_params.num_lanes)) {
1149 return 0;
1150 }
1151
1152 if (ctrl->link->phy_params.v_level >=
1153 DP_TRAIN_LEVEL_MAX) {
1154 DRM_ERROR_RATELIMITED("max v_level reached\n");
1155 return -EAGAIN;
1156 }
1157
1158 if (old_v_level != ctrl->link->phy_params.v_level) {
1159 tries = 0;
1160 old_v_level = ctrl->link->phy_params.v_level;
1161 }
1162
1163 dp_link_adjust_levels(ctrl->link, link_status);
1164 ret = dp_ctrl_update_vx_px(ctrl);
1165 if (ret)
1166 return ret;
1167 }
1168
1169 DRM_ERROR("max tries reached\n");
1170 return -ETIMEDOUT;
1171 }
1172
dp_ctrl_link_rate_down_shift(struct dp_ctrl_private * ctrl)1173 static int dp_ctrl_link_rate_down_shift(struct dp_ctrl_private *ctrl)
1174 {
1175 int ret = 0;
1176
1177 switch (ctrl->link->link_params.rate) {
1178 case 810000:
1179 ctrl->link->link_params.rate = 540000;
1180 break;
1181 case 540000:
1182 ctrl->link->link_params.rate = 270000;
1183 break;
1184 case 270000:
1185 ctrl->link->link_params.rate = 162000;
1186 break;
1187 case 162000:
1188 default:
1189 ret = -EINVAL;
1190 break;
1191 }
1192
1193 if (!ret) {
1194 drm_dbg_dp(ctrl->drm_dev, "new rate=0x%x\n",
1195 ctrl->link->link_params.rate);
1196 }
1197
1198 return ret;
1199 }
1200
dp_ctrl_link_lane_down_shift(struct dp_ctrl_private * ctrl)1201 static int dp_ctrl_link_lane_down_shift(struct dp_ctrl_private *ctrl)
1202 {
1203
1204 if (ctrl->link->link_params.num_lanes == 1)
1205 return -1;
1206
1207 ctrl->link->link_params.num_lanes /= 2;
1208 ctrl->link->link_params.rate = ctrl->panel->link_info.rate;
1209
1210 ctrl->link->phy_params.p_level = 0;
1211 ctrl->link->phy_params.v_level = 0;
1212
1213 return 0;
1214 }
1215
dp_ctrl_clear_training_pattern(struct dp_ctrl_private * ctrl)1216 static void dp_ctrl_clear_training_pattern(struct dp_ctrl_private *ctrl)
1217 {
1218 dp_ctrl_train_pattern_set(ctrl, DP_TRAINING_PATTERN_DISABLE);
1219 drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd);
1220 }
1221
dp_ctrl_link_train_2(struct dp_ctrl_private * ctrl,int * training_step)1222 static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl,
1223 int *training_step)
1224 {
1225 int tries = 0, ret = 0;
1226 u8 pattern;
1227 u32 state_ctrl_bit;
1228 int const maximum_retries = 5;
1229 u8 link_status[DP_LINK_STATUS_SIZE];
1230
1231 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
1232
1233 *training_step = DP_TRAINING_2;
1234
1235 if (drm_dp_tps4_supported(ctrl->panel->dpcd)) {
1236 pattern = DP_TRAINING_PATTERN_4;
1237 state_ctrl_bit = 4;
1238 } else if (drm_dp_tps3_supported(ctrl->panel->dpcd)) {
1239 pattern = DP_TRAINING_PATTERN_3;
1240 state_ctrl_bit = 3;
1241 } else {
1242 pattern = DP_TRAINING_PATTERN_2;
1243 state_ctrl_bit = 2;
1244 }
1245
1246 ret = dp_catalog_ctrl_set_pattern_state_bit(ctrl->catalog, state_ctrl_bit);
1247 if (ret)
1248 return ret;
1249
1250 dp_ctrl_train_pattern_set(ctrl, pattern);
1251
1252 for (tries = 0; tries <= maximum_retries; tries++) {
1253 drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd);
1254
1255 ret = dp_ctrl_read_link_status(ctrl, link_status);
1256 if (ret)
1257 return ret;
1258
1259 if (drm_dp_channel_eq_ok(link_status,
1260 ctrl->link->link_params.num_lanes)) {
1261 return 0;
1262 }
1263
1264 dp_link_adjust_levels(ctrl->link, link_status);
1265 ret = dp_ctrl_update_vx_px(ctrl);
1266 if (ret)
1267 return ret;
1268
1269 }
1270
1271 return -ETIMEDOUT;
1272 }
1273
dp_ctrl_link_train(struct dp_ctrl_private * ctrl,int * training_step)1274 static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl,
1275 int *training_step)
1276 {
1277 int ret = 0;
1278 const u8 *dpcd = ctrl->panel->dpcd;
1279 u8 encoding[] = { 0, DP_SET_ANSI_8B10B };
1280 u8 assr;
1281 struct dp_link_info link_info = {0};
1282
1283 dp_ctrl_config_ctrl(ctrl);
1284
1285 link_info.num_lanes = ctrl->link->link_params.num_lanes;
1286 link_info.rate = ctrl->link->link_params.rate;
1287 link_info.capabilities = DP_LINK_CAP_ENHANCED_FRAMING;
1288
1289 dp_link_reset_phy_params_vx_px(ctrl->link);
1290
1291 dp_aux_link_configure(ctrl->aux, &link_info);
1292
1293 if (drm_dp_max_downspread(dpcd))
1294 encoding[0] |= DP_SPREAD_AMP_0_5;
1295
1296 /* config DOWNSPREAD_CTRL and MAIN_LINK_CHANNEL_CODING_SET */
1297 drm_dp_dpcd_write(ctrl->aux, DP_DOWNSPREAD_CTRL, encoding, 2);
1298
1299 if (drm_dp_alternate_scrambler_reset_cap(dpcd)) {
1300 assr = DP_ALTERNATE_SCRAMBLER_RESET_ENABLE;
1301 drm_dp_dpcd_write(ctrl->aux, DP_EDP_CONFIGURATION_SET,
1302 &assr, 1);
1303 }
1304
1305 ret = dp_ctrl_link_train_1(ctrl, training_step);
1306 if (ret) {
1307 DRM_ERROR("link training #1 failed. ret=%d\n", ret);
1308 goto end;
1309 }
1310
1311 /* print success info as this is a result of user initiated action */
1312 drm_dbg_dp(ctrl->drm_dev, "link training #1 successful\n");
1313
1314 ret = dp_ctrl_link_train_2(ctrl, training_step);
1315 if (ret) {
1316 DRM_ERROR("link training #2 failed. ret=%d\n", ret);
1317 goto end;
1318 }
1319
1320 /* print success info as this is a result of user initiated action */
1321 drm_dbg_dp(ctrl->drm_dev, "link training #2 successful\n");
1322
1323 end:
1324 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
1325
1326 return ret;
1327 }
1328
dp_ctrl_setup_main_link(struct dp_ctrl_private * ctrl,int * training_step)1329 static int dp_ctrl_setup_main_link(struct dp_ctrl_private *ctrl,
1330 int *training_step)
1331 {
1332 int ret = 0;
1333
1334 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, true);
1335
1336 if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
1337 return ret;
1338
1339 /*
1340 * As part of previous calls, DP controller state might have
1341 * transitioned to PUSH_IDLE. In order to start transmitting
1342 * a link training pattern, we have to first do soft reset.
1343 */
1344
1345 ret = dp_ctrl_link_train(ctrl, training_step);
1346
1347 return ret;
1348 }
1349
dp_ctrl_core_clk_enable(struct dp_ctrl * dp_ctrl)1350 int dp_ctrl_core_clk_enable(struct dp_ctrl *dp_ctrl)
1351 {
1352 struct dp_ctrl_private *ctrl;
1353 int ret = 0;
1354
1355 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1356
1357 if (ctrl->core_clks_on) {
1358 drm_dbg_dp(ctrl->drm_dev, "core clks already enabled\n");
1359 return 0;
1360 }
1361
1362 ret = clk_bulk_prepare_enable(ctrl->num_core_clks, ctrl->core_clks);
1363 if (ret)
1364 return ret;
1365
1366 ctrl->core_clks_on = true;
1367
1368 drm_dbg_dp(ctrl->drm_dev, "enable core clocks \n");
1369 drm_dbg_dp(ctrl->drm_dev, "stream_clks:%s link_clks:%s core_clks:%s\n",
1370 ctrl->stream_clks_on ? "on" : "off",
1371 ctrl->link_clks_on ? "on" : "off",
1372 ctrl->core_clks_on ? "on" : "off");
1373
1374 return 0;
1375 }
1376
dp_ctrl_core_clk_disable(struct dp_ctrl * dp_ctrl)1377 void dp_ctrl_core_clk_disable(struct dp_ctrl *dp_ctrl)
1378 {
1379 struct dp_ctrl_private *ctrl;
1380
1381 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1382
1383 clk_bulk_disable_unprepare(ctrl->num_core_clks, ctrl->core_clks);
1384
1385 ctrl->core_clks_on = false;
1386
1387 drm_dbg_dp(ctrl->drm_dev, "disable core clocks \n");
1388 drm_dbg_dp(ctrl->drm_dev, "stream_clks:%s link_clks:%s core_clks:%s\n",
1389 ctrl->stream_clks_on ? "on" : "off",
1390 ctrl->link_clks_on ? "on" : "off",
1391 ctrl->core_clks_on ? "on" : "off");
1392 }
1393
dp_ctrl_link_clk_enable(struct dp_ctrl * dp_ctrl)1394 static int dp_ctrl_link_clk_enable(struct dp_ctrl *dp_ctrl)
1395 {
1396 struct dp_ctrl_private *ctrl;
1397 int ret = 0;
1398
1399 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1400
1401 if (ctrl->link_clks_on) {
1402 drm_dbg_dp(ctrl->drm_dev, "links clks already enabled\n");
1403 return 0;
1404 }
1405
1406 if (!ctrl->core_clks_on) {
1407 drm_dbg_dp(ctrl->drm_dev, "Enable core clks before link clks\n");
1408
1409 dp_ctrl_core_clk_enable(dp_ctrl);
1410 }
1411
1412 ret = clk_bulk_prepare_enable(ctrl->num_link_clks, ctrl->link_clks);
1413 if (ret)
1414 return ret;
1415
1416 ctrl->link_clks_on = true;
1417
1418 drm_dbg_dp(ctrl->drm_dev, "enable link clocks\n");
1419 drm_dbg_dp(ctrl->drm_dev, "stream_clks:%s link_clks:%s core_clks:%s\n",
1420 ctrl->stream_clks_on ? "on" : "off",
1421 ctrl->link_clks_on ? "on" : "off",
1422 ctrl->core_clks_on ? "on" : "off");
1423
1424 return 0;
1425 }
1426
dp_ctrl_link_clk_disable(struct dp_ctrl * dp_ctrl)1427 static void dp_ctrl_link_clk_disable(struct dp_ctrl *dp_ctrl)
1428 {
1429 struct dp_ctrl_private *ctrl;
1430
1431 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1432
1433 clk_bulk_disable_unprepare(ctrl->num_link_clks, ctrl->link_clks);
1434
1435 ctrl->link_clks_on = false;
1436
1437 drm_dbg_dp(ctrl->drm_dev, "disabled link clocks\n");
1438 drm_dbg_dp(ctrl->drm_dev, "stream_clks:%s link_clks:%s core_clks:%s\n",
1439 ctrl->stream_clks_on ? "on" : "off",
1440 ctrl->link_clks_on ? "on" : "off",
1441 ctrl->core_clks_on ? "on" : "off");
1442 }
1443
dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private * ctrl)1444 static int dp_ctrl_enable_mainlink_clocks(struct dp_ctrl_private *ctrl)
1445 {
1446 int ret = 0;
1447 struct phy *phy = ctrl->phy;
1448 const u8 *dpcd = ctrl->panel->dpcd;
1449
1450 ctrl->phy_opts.dp.lanes = ctrl->link->link_params.num_lanes;
1451 ctrl->phy_opts.dp.link_rate = ctrl->link->link_params.rate / 100;
1452 ctrl->phy_opts.dp.ssc = drm_dp_max_downspread(dpcd);
1453
1454 phy_configure(phy, &ctrl->phy_opts);
1455 phy_power_on(phy);
1456
1457 dev_pm_opp_set_rate(ctrl->dev, ctrl->link->link_params.rate * 1000);
1458 ret = dp_ctrl_link_clk_enable(&ctrl->dp_ctrl);
1459 if (ret)
1460 DRM_ERROR("Unable to start link clocks. ret=%d\n", ret);
1461
1462 drm_dbg_dp(ctrl->drm_dev, "link rate=%d\n", ctrl->link->link_params.rate);
1463
1464 return ret;
1465 }
1466
dp_ctrl_reset_irq_ctrl(struct dp_ctrl * dp_ctrl,bool enable)1467 void dp_ctrl_reset_irq_ctrl(struct dp_ctrl *dp_ctrl, bool enable)
1468 {
1469 struct dp_ctrl_private *ctrl;
1470
1471 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1472
1473 dp_catalog_ctrl_reset(ctrl->catalog);
1474
1475 /*
1476 * all dp controller programmable registers will not
1477 * be reset to default value after DP_SW_RESET
1478 * therefore interrupt mask bits have to be updated
1479 * to enable/disable interrupts
1480 */
1481 dp_catalog_ctrl_enable_irq(ctrl->catalog, enable);
1482 }
1483
dp_ctrl_config_psr(struct dp_ctrl * dp_ctrl)1484 void dp_ctrl_config_psr(struct dp_ctrl *dp_ctrl)
1485 {
1486 u8 cfg;
1487 struct dp_ctrl_private *ctrl = container_of(dp_ctrl,
1488 struct dp_ctrl_private, dp_ctrl);
1489
1490 if (!ctrl->panel->psr_cap.version)
1491 return;
1492
1493 dp_catalog_ctrl_config_psr(ctrl->catalog);
1494
1495 cfg = DP_PSR_ENABLE;
1496 drm_dp_dpcd_write(ctrl->aux, DP_PSR_EN_CFG, &cfg, 1);
1497 }
1498
dp_ctrl_set_psr(struct dp_ctrl * dp_ctrl,bool enter)1499 void dp_ctrl_set_psr(struct dp_ctrl *dp_ctrl, bool enter)
1500 {
1501 struct dp_ctrl_private *ctrl = container_of(dp_ctrl,
1502 struct dp_ctrl_private, dp_ctrl);
1503
1504 if (!ctrl->panel->psr_cap.version)
1505 return;
1506
1507 /*
1508 * When entering PSR,
1509 * 1. Send PSR enter SDP and wait for the PSR_UPDATE_INT
1510 * 2. Turn off video
1511 * 3. Disable the mainlink
1512 *
1513 * When exiting PSR,
1514 * 1. Enable the mainlink
1515 * 2. Send the PSR exit SDP
1516 */
1517 if (enter) {
1518 reinit_completion(&ctrl->psr_op_comp);
1519 dp_catalog_ctrl_set_psr(ctrl->catalog, true);
1520
1521 if (!wait_for_completion_timeout(&ctrl->psr_op_comp,
1522 PSR_OPERATION_COMPLETION_TIMEOUT_JIFFIES)) {
1523 DRM_ERROR("PSR_ENTRY timedout\n");
1524 dp_catalog_ctrl_set_psr(ctrl->catalog, false);
1525 return;
1526 }
1527
1528 dp_ctrl_push_idle(dp_ctrl);
1529 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
1530
1531 dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, false);
1532 } else {
1533 dp_catalog_ctrl_psr_mainlink_enable(ctrl->catalog, true);
1534
1535 dp_catalog_ctrl_set_psr(ctrl->catalog, false);
1536 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
1537 dp_ctrl_wait4video_ready(ctrl);
1538 dp_catalog_ctrl_state_ctrl(ctrl->catalog, 0);
1539 }
1540 }
1541
dp_ctrl_phy_init(struct dp_ctrl * dp_ctrl)1542 void dp_ctrl_phy_init(struct dp_ctrl *dp_ctrl)
1543 {
1544 struct dp_ctrl_private *ctrl;
1545 struct phy *phy;
1546
1547 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1548 phy = ctrl->phy;
1549
1550 dp_catalog_ctrl_phy_reset(ctrl->catalog);
1551 phy_init(phy);
1552
1553 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
1554 phy, phy->init_count, phy->power_count);
1555 }
1556
dp_ctrl_phy_exit(struct dp_ctrl * dp_ctrl)1557 void dp_ctrl_phy_exit(struct dp_ctrl *dp_ctrl)
1558 {
1559 struct dp_ctrl_private *ctrl;
1560 struct phy *phy;
1561
1562 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1563 phy = ctrl->phy;
1564
1565 dp_catalog_ctrl_phy_reset(ctrl->catalog);
1566 phy_exit(phy);
1567 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
1568 phy, phy->init_count, phy->power_count);
1569 }
1570
dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private * ctrl)1571 static int dp_ctrl_reinitialize_mainlink(struct dp_ctrl_private *ctrl)
1572 {
1573 struct phy *phy = ctrl->phy;
1574 int ret = 0;
1575
1576 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
1577 ctrl->phy_opts.dp.lanes = ctrl->link->link_params.num_lanes;
1578 phy_configure(phy, &ctrl->phy_opts);
1579 /*
1580 * Disable and re-enable the mainlink clock since the
1581 * link clock might have been adjusted as part of the
1582 * link maintenance.
1583 */
1584 dev_pm_opp_set_rate(ctrl->dev, 0);
1585
1586 dp_ctrl_link_clk_disable(&ctrl->dp_ctrl);
1587
1588 phy_power_off(phy);
1589 /* hw recommended delay before re-enabling clocks */
1590 msleep(20);
1591
1592 ret = dp_ctrl_enable_mainlink_clocks(ctrl);
1593 if (ret) {
1594 DRM_ERROR("Failed to enable mainlink clks. ret=%d\n", ret);
1595 return ret;
1596 }
1597
1598 return ret;
1599 }
1600
dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private * ctrl)1601 static int dp_ctrl_deinitialize_mainlink(struct dp_ctrl_private *ctrl)
1602 {
1603 struct phy *phy;
1604
1605 phy = ctrl->phy;
1606
1607 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
1608
1609 dp_catalog_ctrl_reset(ctrl->catalog);
1610
1611 dev_pm_opp_set_rate(ctrl->dev, 0);
1612 dp_ctrl_link_clk_disable(&ctrl->dp_ctrl);
1613
1614 phy_power_off(phy);
1615
1616 /* aux channel down, reinit phy */
1617 phy_exit(phy);
1618 phy_init(phy);
1619
1620 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
1621 phy, phy->init_count, phy->power_count);
1622 return 0;
1623 }
1624
dp_ctrl_link_maintenance(struct dp_ctrl_private * ctrl)1625 static int dp_ctrl_link_maintenance(struct dp_ctrl_private *ctrl)
1626 {
1627 int ret = 0;
1628 int training_step = DP_TRAINING_NONE;
1629
1630 dp_ctrl_push_idle(&ctrl->dp_ctrl);
1631
1632 ctrl->link->phy_params.p_level = 0;
1633 ctrl->link->phy_params.v_level = 0;
1634
1635 ret = dp_ctrl_setup_main_link(ctrl, &training_step);
1636 if (ret)
1637 goto end;
1638
1639 dp_ctrl_clear_training_pattern(ctrl);
1640
1641 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
1642
1643 ret = dp_ctrl_wait4video_ready(ctrl);
1644 end:
1645 return ret;
1646 }
1647
dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private * ctrl)1648 static bool dp_ctrl_send_phy_test_pattern(struct dp_ctrl_private *ctrl)
1649 {
1650 bool success = false;
1651 u32 pattern_sent = 0x0;
1652 u32 pattern_requested = ctrl->link->phy_params.phy_test_pattern_sel;
1653
1654 drm_dbg_dp(ctrl->drm_dev, "request: 0x%x\n", pattern_requested);
1655
1656 if (dp_ctrl_set_vx_px(ctrl,
1657 ctrl->link->phy_params.v_level,
1658 ctrl->link->phy_params.p_level)) {
1659 DRM_ERROR("Failed to set v/p levels\n");
1660 return false;
1661 }
1662 dp_catalog_ctrl_send_phy_pattern(ctrl->catalog, pattern_requested);
1663 dp_ctrl_update_vx_px(ctrl);
1664 dp_link_send_test_response(ctrl->link);
1665
1666 pattern_sent = dp_catalog_ctrl_read_phy_pattern(ctrl->catalog);
1667
1668 switch (pattern_sent) {
1669 case MR_LINK_TRAINING1:
1670 success = (pattern_requested ==
1671 DP_PHY_TEST_PATTERN_D10_2);
1672 break;
1673 case MR_LINK_SYMBOL_ERM:
1674 success = ((pattern_requested ==
1675 DP_PHY_TEST_PATTERN_ERROR_COUNT) ||
1676 (pattern_requested ==
1677 DP_PHY_TEST_PATTERN_CP2520));
1678 break;
1679 case MR_LINK_PRBS7:
1680 success = (pattern_requested ==
1681 DP_PHY_TEST_PATTERN_PRBS7);
1682 break;
1683 case MR_LINK_CUSTOM80:
1684 success = (pattern_requested ==
1685 DP_PHY_TEST_PATTERN_80BIT_CUSTOM);
1686 break;
1687 case MR_LINK_TRAINING4:
1688 success = (pattern_requested ==
1689 DP_PHY_TEST_PATTERN_SEL_MASK);
1690 break;
1691 default:
1692 success = false;
1693 }
1694
1695 drm_dbg_dp(ctrl->drm_dev, "%s: test->0x%x\n",
1696 success ? "success" : "failed", pattern_requested);
1697 return success;
1698 }
1699
dp_ctrl_process_phy_test_request(struct dp_ctrl_private * ctrl)1700 static int dp_ctrl_process_phy_test_request(struct dp_ctrl_private *ctrl)
1701 {
1702 int ret;
1703 unsigned long pixel_rate;
1704
1705 if (!ctrl->link->phy_params.phy_test_pattern_sel) {
1706 drm_dbg_dp(ctrl->drm_dev,
1707 "no test pattern selected by sink\n");
1708 return 0;
1709 }
1710
1711 /*
1712 * The global reset will need DP link related clocks to be
1713 * running. Add the global reset just before disabling the
1714 * link clocks and core clocks.
1715 */
1716 dp_ctrl_off(&ctrl->dp_ctrl);
1717
1718 ret = dp_ctrl_on_link(&ctrl->dp_ctrl);
1719 if (ret) {
1720 DRM_ERROR("failed to enable DP link controller\n");
1721 return ret;
1722 }
1723
1724 pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
1725 ret = clk_set_rate(ctrl->pixel_clk, pixel_rate * 1000);
1726 if (ret) {
1727 DRM_ERROR("Failed to set pixel clock rate. ret=%d\n", ret);
1728 return ret;
1729 }
1730
1731 if (ctrl->stream_clks_on) {
1732 drm_dbg_dp(ctrl->drm_dev, "pixel clks already enabled\n");
1733 } else {
1734 ret = clk_prepare_enable(ctrl->pixel_clk);
1735 if (ret) {
1736 DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
1737 return ret;
1738 }
1739 ctrl->stream_clks_on = true;
1740 }
1741
1742 dp_ctrl_send_phy_test_pattern(ctrl);
1743
1744 return 0;
1745 }
1746
dp_ctrl_handle_sink_request(struct dp_ctrl * dp_ctrl)1747 void dp_ctrl_handle_sink_request(struct dp_ctrl *dp_ctrl)
1748 {
1749 struct dp_ctrl_private *ctrl;
1750 u32 sink_request = 0x0;
1751
1752 if (!dp_ctrl) {
1753 DRM_ERROR("invalid input\n");
1754 return;
1755 }
1756
1757 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1758 sink_request = ctrl->link->sink_request;
1759
1760 if (sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
1761 drm_dbg_dp(ctrl->drm_dev, "PHY_TEST_PATTERN request\n");
1762 if (dp_ctrl_process_phy_test_request(ctrl)) {
1763 DRM_ERROR("process phy_test_req failed\n");
1764 return;
1765 }
1766 }
1767
1768 if (sink_request & DP_LINK_STATUS_UPDATED) {
1769 if (dp_ctrl_link_maintenance(ctrl)) {
1770 DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
1771 return;
1772 }
1773 }
1774
1775 if (sink_request & DP_TEST_LINK_TRAINING) {
1776 dp_link_send_test_response(ctrl->link);
1777 if (dp_ctrl_link_maintenance(ctrl)) {
1778 DRM_ERROR("LM failed: TEST_LINK_TRAINING\n");
1779 return;
1780 }
1781 }
1782 }
1783
dp_ctrl_clock_recovery_any_ok(const u8 link_status[DP_LINK_STATUS_SIZE],int lane_count)1784 static bool dp_ctrl_clock_recovery_any_ok(
1785 const u8 link_status[DP_LINK_STATUS_SIZE],
1786 int lane_count)
1787 {
1788 int reduced_cnt;
1789
1790 if (lane_count <= 1)
1791 return false;
1792
1793 /*
1794 * only interested in the lane number after reduced
1795 * lane_count = 4, then only interested in 2 lanes
1796 * lane_count = 2, then only interested in 1 lane
1797 */
1798 reduced_cnt = lane_count >> 1;
1799
1800 return drm_dp_clock_recovery_ok(link_status, reduced_cnt);
1801 }
1802
dp_ctrl_channel_eq_ok(struct dp_ctrl_private * ctrl)1803 static bool dp_ctrl_channel_eq_ok(struct dp_ctrl_private *ctrl)
1804 {
1805 u8 link_status[DP_LINK_STATUS_SIZE];
1806 int num_lanes = ctrl->link->link_params.num_lanes;
1807
1808 dp_ctrl_read_link_status(ctrl, link_status);
1809
1810 return drm_dp_channel_eq_ok(link_status, num_lanes);
1811 }
1812
dp_ctrl_on_link(struct dp_ctrl * dp_ctrl)1813 int dp_ctrl_on_link(struct dp_ctrl *dp_ctrl)
1814 {
1815 int rc = 0;
1816 struct dp_ctrl_private *ctrl;
1817 u32 rate;
1818 int link_train_max_retries = 5;
1819 u32 const phy_cts_pixel_clk_khz = 148500;
1820 u8 link_status[DP_LINK_STATUS_SIZE];
1821 unsigned int training_step;
1822 unsigned long pixel_rate;
1823
1824 if (!dp_ctrl)
1825 return -EINVAL;
1826
1827 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1828
1829 rate = ctrl->panel->link_info.rate;
1830 pixel_rate = ctrl->panel->dp_mode.drm_mode.clock;
1831
1832 dp_ctrl_core_clk_enable(&ctrl->dp_ctrl);
1833
1834 if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN) {
1835 drm_dbg_dp(ctrl->drm_dev,
1836 "using phy test link parameters\n");
1837 if (!pixel_rate)
1838 pixel_rate = phy_cts_pixel_clk_khz;
1839 } else {
1840 ctrl->link->link_params.rate = rate;
1841 ctrl->link->link_params.num_lanes =
1842 ctrl->panel->link_info.num_lanes;
1843 if (ctrl->panel->dp_mode.out_fmt_is_yuv_420)
1844 pixel_rate >>= 1;
1845 }
1846
1847 drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n",
1848 ctrl->link->link_params.rate, ctrl->link->link_params.num_lanes,
1849 pixel_rate);
1850
1851 rc = dp_ctrl_enable_mainlink_clocks(ctrl);
1852 if (rc)
1853 return rc;
1854
1855 while (--link_train_max_retries) {
1856 training_step = DP_TRAINING_NONE;
1857 rc = dp_ctrl_setup_main_link(ctrl, &training_step);
1858 if (rc == 0) {
1859 /* training completed successfully */
1860 break;
1861 } else if (training_step == DP_TRAINING_1) {
1862 /* link train_1 failed */
1863 if (!dp_catalog_link_is_connected(ctrl->catalog))
1864 break;
1865
1866 dp_ctrl_read_link_status(ctrl, link_status);
1867
1868 rc = dp_ctrl_link_rate_down_shift(ctrl);
1869 if (rc < 0) { /* already in RBR = 1.6G */
1870 if (dp_ctrl_clock_recovery_any_ok(link_status,
1871 ctrl->link->link_params.num_lanes)) {
1872 /*
1873 * some lanes are ready,
1874 * reduce lane number
1875 */
1876 rc = dp_ctrl_link_lane_down_shift(ctrl);
1877 if (rc < 0) { /* lane == 1 already */
1878 /* end with failure */
1879 break;
1880 }
1881 } else {
1882 /* end with failure */
1883 break; /* lane == 1 already */
1884 }
1885 }
1886 } else if (training_step == DP_TRAINING_2) {
1887 /* link train_2 failed */
1888 if (!dp_catalog_link_is_connected(ctrl->catalog))
1889 break;
1890
1891 dp_ctrl_read_link_status(ctrl, link_status);
1892
1893 if (!drm_dp_clock_recovery_ok(link_status,
1894 ctrl->link->link_params.num_lanes))
1895 rc = dp_ctrl_link_rate_down_shift(ctrl);
1896 else
1897 rc = dp_ctrl_link_lane_down_shift(ctrl);
1898
1899 if (rc < 0) {
1900 /* end with failure */
1901 break; /* lane == 1 already */
1902 }
1903
1904 /* stop link training before start re training */
1905 dp_ctrl_clear_training_pattern(ctrl);
1906 }
1907
1908 rc = dp_ctrl_reinitialize_mainlink(ctrl);
1909 if (rc) {
1910 DRM_ERROR("Failed to reinitialize mainlink. rc=%d\n", rc);
1911 break;
1912 }
1913 }
1914
1915 if (ctrl->link->sink_request & DP_TEST_LINK_PHY_TEST_PATTERN)
1916 return rc;
1917
1918 if (rc == 0) { /* link train successfully */
1919 /*
1920 * do not stop train pattern here
1921 * stop link training at on_stream
1922 * to pass compliance test
1923 */
1924 } else {
1925 /*
1926 * link training failed
1927 * end txing train pattern here
1928 */
1929 dp_ctrl_clear_training_pattern(ctrl);
1930
1931 dp_ctrl_deinitialize_mainlink(ctrl);
1932 rc = -ECONNRESET;
1933 }
1934
1935 return rc;
1936 }
1937
dp_ctrl_link_retrain(struct dp_ctrl_private * ctrl)1938 static int dp_ctrl_link_retrain(struct dp_ctrl_private *ctrl)
1939 {
1940 int training_step = DP_TRAINING_NONE;
1941
1942 return dp_ctrl_setup_main_link(ctrl, &training_step);
1943 }
1944
dp_ctrl_on_stream(struct dp_ctrl * dp_ctrl,bool force_link_train)1945 int dp_ctrl_on_stream(struct dp_ctrl *dp_ctrl, bool force_link_train)
1946 {
1947 int ret = 0;
1948 bool mainlink_ready = false;
1949 struct dp_ctrl_private *ctrl;
1950 unsigned long pixel_rate;
1951 unsigned long pixel_rate_orig;
1952
1953 if (!dp_ctrl)
1954 return -EINVAL;
1955
1956 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
1957
1958 pixel_rate = pixel_rate_orig = ctrl->panel->dp_mode.drm_mode.clock;
1959
1960 if (dp_ctrl->wide_bus_en || ctrl->panel->dp_mode.out_fmt_is_yuv_420)
1961 pixel_rate >>= 1;
1962
1963 drm_dbg_dp(ctrl->drm_dev, "rate=%d, num_lanes=%d, pixel_rate=%lu\n",
1964 ctrl->link->link_params.rate,
1965 ctrl->link->link_params.num_lanes, pixel_rate);
1966
1967 drm_dbg_dp(ctrl->drm_dev,
1968 "core_clk_on=%d link_clk_on=%d stream_clk_on=%d\n",
1969 ctrl->core_clks_on, ctrl->link_clks_on, ctrl->stream_clks_on);
1970
1971 if (!ctrl->link_clks_on) { /* link clk is off */
1972 ret = dp_ctrl_enable_mainlink_clocks(ctrl);
1973 if (ret) {
1974 DRM_ERROR("Failed to start link clocks. ret=%d\n", ret);
1975 goto end;
1976 }
1977 }
1978
1979 ret = clk_set_rate(ctrl->pixel_clk, pixel_rate * 1000);
1980 if (ret) {
1981 DRM_ERROR("Failed to set pixel clock rate. ret=%d\n", ret);
1982 goto end;
1983 }
1984
1985 if (ctrl->stream_clks_on) {
1986 drm_dbg_dp(ctrl->drm_dev, "pixel clks already enabled\n");
1987 } else {
1988 ret = clk_prepare_enable(ctrl->pixel_clk);
1989 if (ret) {
1990 DRM_ERROR("Failed to start pixel clocks. ret=%d\n", ret);
1991 goto end;
1992 }
1993 ctrl->stream_clks_on = true;
1994 }
1995
1996 if (force_link_train || !dp_ctrl_channel_eq_ok(ctrl))
1997 dp_ctrl_link_retrain(ctrl);
1998
1999 /* stop txing train pattern to end link training */
2000 dp_ctrl_clear_training_pattern(ctrl);
2001
2002 /*
2003 * Set up transfer unit values and set controller state to send
2004 * video.
2005 */
2006 reinit_completion(&ctrl->video_comp);
2007
2008 dp_ctrl_configure_source_params(ctrl);
2009
2010 dp_catalog_ctrl_config_msa(ctrl->catalog,
2011 ctrl->link->link_params.rate,
2012 pixel_rate_orig,
2013 ctrl->panel->dp_mode.out_fmt_is_yuv_420);
2014
2015 dp_ctrl_setup_tr_unit(ctrl);
2016
2017 dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
2018
2019 ret = dp_ctrl_wait4video_ready(ctrl);
2020 if (ret)
2021 return ret;
2022
2023 mainlink_ready = dp_catalog_ctrl_mainlink_ready(ctrl->catalog);
2024 drm_dbg_dp(ctrl->drm_dev,
2025 "mainlink %s\n", mainlink_ready ? "READY" : "NOT READY");
2026
2027 end:
2028 return ret;
2029 }
2030
dp_ctrl_off_link_stream(struct dp_ctrl * dp_ctrl)2031 void dp_ctrl_off_link_stream(struct dp_ctrl *dp_ctrl)
2032 {
2033 struct dp_ctrl_private *ctrl;
2034 struct phy *phy;
2035
2036 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
2037 phy = ctrl->phy;
2038
2039 dp_catalog_panel_disable_vsc_sdp(ctrl->catalog);
2040
2041 /* set dongle to D3 (power off) mode */
2042 dp_link_psm_config(ctrl->link, &ctrl->panel->link_info, true);
2043
2044 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
2045
2046 if (ctrl->stream_clks_on) {
2047 clk_disable_unprepare(ctrl->pixel_clk);
2048 ctrl->stream_clks_on = false;
2049 }
2050
2051 dev_pm_opp_set_rate(ctrl->dev, 0);
2052 dp_ctrl_link_clk_disable(&ctrl->dp_ctrl);
2053
2054 phy_power_off(phy);
2055
2056 /* aux channel down, reinit phy */
2057 phy_exit(phy);
2058 phy_init(phy);
2059
2060 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
2061 phy, phy->init_count, phy->power_count);
2062 }
2063
dp_ctrl_off_link(struct dp_ctrl * dp_ctrl)2064 void dp_ctrl_off_link(struct dp_ctrl *dp_ctrl)
2065 {
2066 struct dp_ctrl_private *ctrl;
2067 struct phy *phy;
2068
2069 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
2070 phy = ctrl->phy;
2071
2072 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
2073
2074 dp_ctrl_link_clk_disable(&ctrl->dp_ctrl);
2075
2076 DRM_DEBUG_DP("Before, phy=%p init_count=%d power_on=%d\n",
2077 phy, phy->init_count, phy->power_count);
2078
2079 phy_power_off(phy);
2080
2081 DRM_DEBUG_DP("After, phy=%p init_count=%d power_on=%d\n",
2082 phy, phy->init_count, phy->power_count);
2083 }
2084
dp_ctrl_off(struct dp_ctrl * dp_ctrl)2085 void dp_ctrl_off(struct dp_ctrl *dp_ctrl)
2086 {
2087 struct dp_ctrl_private *ctrl;
2088 struct phy *phy;
2089
2090 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
2091 phy = ctrl->phy;
2092
2093 dp_catalog_panel_disable_vsc_sdp(ctrl->catalog);
2094
2095 dp_catalog_ctrl_mainlink_ctrl(ctrl->catalog, false);
2096
2097 dp_catalog_ctrl_reset(ctrl->catalog);
2098
2099 if (ctrl->stream_clks_on) {
2100 clk_disable_unprepare(ctrl->pixel_clk);
2101 ctrl->stream_clks_on = false;
2102 }
2103
2104 dev_pm_opp_set_rate(ctrl->dev, 0);
2105 dp_ctrl_link_clk_disable(&ctrl->dp_ctrl);
2106
2107 phy_power_off(phy);
2108 drm_dbg_dp(ctrl->drm_dev, "phy=%p init=%d power_on=%d\n",
2109 phy, phy->init_count, phy->power_count);
2110 }
2111
dp_ctrl_isr(struct dp_ctrl * dp_ctrl)2112 irqreturn_t dp_ctrl_isr(struct dp_ctrl *dp_ctrl)
2113 {
2114 struct dp_ctrl_private *ctrl;
2115 u32 isr;
2116 irqreturn_t ret = IRQ_NONE;
2117
2118 if (!dp_ctrl)
2119 return IRQ_NONE;
2120
2121 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
2122
2123 if (ctrl->panel->psr_cap.version) {
2124 isr = dp_catalog_ctrl_read_psr_interrupt_status(ctrl->catalog);
2125
2126 if (isr)
2127 complete(&ctrl->psr_op_comp);
2128
2129 if (isr & PSR_EXIT_INT)
2130 drm_dbg_dp(ctrl->drm_dev, "PSR exit done\n");
2131
2132 if (isr & PSR_UPDATE_INT)
2133 drm_dbg_dp(ctrl->drm_dev, "PSR frame update done\n");
2134
2135 if (isr & PSR_CAPTURE_INT)
2136 drm_dbg_dp(ctrl->drm_dev, "PSR frame capture done\n");
2137 }
2138
2139 isr = dp_catalog_ctrl_get_interrupt(ctrl->catalog);
2140
2141
2142 if (isr & DP_CTRL_INTR_READY_FOR_VIDEO) {
2143 drm_dbg_dp(ctrl->drm_dev, "dp_video_ready\n");
2144 complete(&ctrl->video_comp);
2145 ret = IRQ_HANDLED;
2146 }
2147
2148 if (isr & DP_CTRL_INTR_IDLE_PATTERN_SENT) {
2149 drm_dbg_dp(ctrl->drm_dev, "idle_patterns_sent\n");
2150 complete(&ctrl->idle_comp);
2151 ret = IRQ_HANDLED;
2152 }
2153
2154 return ret;
2155 }
2156
2157 static const char *core_clks[] = {
2158 "core_iface",
2159 "core_aux",
2160 };
2161
2162 static const char *ctrl_clks[] = {
2163 "ctrl_link",
2164 "ctrl_link_iface",
2165 };
2166
dp_ctrl_clk_init(struct dp_ctrl * dp_ctrl)2167 static int dp_ctrl_clk_init(struct dp_ctrl *dp_ctrl)
2168 {
2169 struct dp_ctrl_private *ctrl;
2170 struct device *dev;
2171 int i, rc;
2172
2173 ctrl = container_of(dp_ctrl, struct dp_ctrl_private, dp_ctrl);
2174 dev = ctrl->dev;
2175
2176 ctrl->num_core_clks = ARRAY_SIZE(core_clks);
2177 ctrl->core_clks = devm_kcalloc(dev, ctrl->num_core_clks, sizeof(*ctrl->core_clks), GFP_KERNEL);
2178 if (!ctrl->core_clks)
2179 return -ENOMEM;
2180
2181 for (i = 0; i < ctrl->num_core_clks; i++)
2182 ctrl->core_clks[i].id = core_clks[i];
2183
2184 rc = devm_clk_bulk_get(dev, ctrl->num_core_clks, ctrl->core_clks);
2185 if (rc)
2186 return rc;
2187
2188 ctrl->num_link_clks = ARRAY_SIZE(ctrl_clks);
2189 ctrl->link_clks = devm_kcalloc(dev, ctrl->num_link_clks, sizeof(*ctrl->link_clks), GFP_KERNEL);
2190 if (!ctrl->link_clks)
2191 return -ENOMEM;
2192
2193 for (i = 0; i < ctrl->num_link_clks; i++)
2194 ctrl->link_clks[i].id = ctrl_clks[i];
2195
2196 rc = devm_clk_bulk_get(dev, ctrl->num_link_clks, ctrl->link_clks);
2197 if (rc)
2198 return rc;
2199
2200 ctrl->pixel_clk = devm_clk_get(dev, "stream_pixel");
2201 if (IS_ERR(ctrl->pixel_clk))
2202 return PTR_ERR(ctrl->pixel_clk);
2203
2204 return 0;
2205 }
2206
dp_ctrl_get(struct device * dev,struct dp_link * link,struct dp_panel * panel,struct drm_dp_aux * aux,struct dp_catalog * catalog,struct phy * phy)2207 struct dp_ctrl *dp_ctrl_get(struct device *dev, struct dp_link *link,
2208 struct dp_panel *panel, struct drm_dp_aux *aux,
2209 struct dp_catalog *catalog,
2210 struct phy *phy)
2211 {
2212 struct dp_ctrl_private *ctrl;
2213 int ret;
2214
2215 if (!dev || !panel || !aux ||
2216 !link || !catalog) {
2217 DRM_ERROR("invalid input\n");
2218 return ERR_PTR(-EINVAL);
2219 }
2220
2221 ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
2222 if (!ctrl) {
2223 DRM_ERROR("Mem allocation failure\n");
2224 return ERR_PTR(-ENOMEM);
2225 }
2226
2227 ret = devm_pm_opp_set_clkname(dev, "ctrl_link");
2228 if (ret) {
2229 dev_err(dev, "invalid DP OPP table in device tree\n");
2230 /* caller do PTR_ERR(opp_table) */
2231 return (struct dp_ctrl *)ERR_PTR(ret);
2232 }
2233
2234 /* OPP table is optional */
2235 ret = devm_pm_opp_of_add_table(dev);
2236 if (ret)
2237 dev_err(dev, "failed to add DP OPP table\n");
2238
2239 init_completion(&ctrl->idle_comp);
2240 init_completion(&ctrl->psr_op_comp);
2241 init_completion(&ctrl->video_comp);
2242
2243 /* in parameters */
2244 ctrl->panel = panel;
2245 ctrl->aux = aux;
2246 ctrl->link = link;
2247 ctrl->catalog = catalog;
2248 ctrl->dev = dev;
2249 ctrl->phy = phy;
2250
2251 ret = dp_ctrl_clk_init(&ctrl->dp_ctrl);
2252 if (ret) {
2253 dev_err(dev, "failed to init clocks\n");
2254 return ERR_PTR(ret);
2255 }
2256
2257 return &ctrl->dp_ctrl;
2258 }
2259