1 /*
2 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 and
6 * only version 2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14 #include <linux/clk.h>
15 #include <linux/gpio/consumer.h>
16 #include <linux/regulator/consumer.h>
17 #include <drm/drm_crtc.h>
18 #include <drm/drm_dp_helper.h>
19 #include <drm/drm_edid.h>
20
21 #include "edp.h"
22 #include "edp.xml.h"
23
24 #define VDDA_UA_ON_LOAD 100000 /* uA units */
25 #define VDDA_UA_OFF_LOAD 100 /* uA units */
26
27 #define DPCD_LINK_VOLTAGE_MAX 4
28 #define DPCD_LINK_PRE_EMPHASIS_MAX 4
29
30 #define EDP_LINK_BW_MAX DP_LINK_BW_2_7
31
32 /* Link training return value */
33 #define EDP_TRAIN_FAIL -1
34 #define EDP_TRAIN_SUCCESS 0
35 #define EDP_TRAIN_RECONFIG 1
36
37 #define EDP_CLK_MASK_AHB BIT(0)
38 #define EDP_CLK_MASK_AUX BIT(1)
39 #define EDP_CLK_MASK_LINK BIT(2)
40 #define EDP_CLK_MASK_PIXEL BIT(3)
41 #define EDP_CLK_MASK_MDP_CORE BIT(4)
42 #define EDP_CLK_MASK_LINK_CHAN (EDP_CLK_MASK_LINK | EDP_CLK_MASK_PIXEL)
43 #define EDP_CLK_MASK_AUX_CHAN \
44 (EDP_CLK_MASK_AHB | EDP_CLK_MASK_AUX | EDP_CLK_MASK_MDP_CORE)
45 #define EDP_CLK_MASK_ALL (EDP_CLK_MASK_AUX_CHAN | EDP_CLK_MASK_LINK_CHAN)
46
47 #define EDP_BACKLIGHT_MAX 255
48
49 #define EDP_INTR_STATUS1 \
50 (EDP_INTERRUPT_REG_1_HPD | EDP_INTERRUPT_REG_1_AUX_I2C_DONE | \
51 EDP_INTERRUPT_REG_1_WRONG_ADDR | EDP_INTERRUPT_REG_1_TIMEOUT | \
52 EDP_INTERRUPT_REG_1_NACK_DEFER | EDP_INTERRUPT_REG_1_WRONG_DATA_CNT | \
53 EDP_INTERRUPT_REG_1_I2C_NACK | EDP_INTERRUPT_REG_1_I2C_DEFER | \
54 EDP_INTERRUPT_REG_1_PLL_UNLOCK | EDP_INTERRUPT_REG_1_AUX_ERROR)
55 #define EDP_INTR_MASK1 (EDP_INTR_STATUS1 << 2)
56 #define EDP_INTR_STATUS2 \
57 (EDP_INTERRUPT_REG_2_READY_FOR_VIDEO | \
58 EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT | \
59 EDP_INTERRUPT_REG_2_FRAME_END | EDP_INTERRUPT_REG_2_CRC_UPDATED)
60 #define EDP_INTR_MASK2 (EDP_INTR_STATUS2 << 2)
61
62 struct edp_ctrl {
63 struct platform_device *pdev;
64
65 void __iomem *base;
66
67 /* regulators */
68 struct regulator *vdda_vreg; /* 1.8 V */
69 struct regulator *lvl_vreg;
70
71 /* clocks */
72 struct clk *aux_clk;
73 struct clk *pixel_clk;
74 struct clk *ahb_clk;
75 struct clk *link_clk;
76 struct clk *mdp_core_clk;
77
78 /* gpios */
79 struct gpio_desc *panel_en_gpio;
80 struct gpio_desc *panel_hpd_gpio;
81
82 /* completion and mutex */
83 struct completion idle_comp;
84 struct mutex dev_mutex; /* To protect device power status */
85
86 /* work queue */
87 struct work_struct on_work;
88 struct work_struct off_work;
89 struct workqueue_struct *workqueue;
90
91 /* Interrupt register lock */
92 spinlock_t irq_lock;
93
94 bool edp_connected;
95 bool power_on;
96
97 /* edid raw data */
98 struct edid *edid;
99
100 struct drm_dp_link dp_link;
101 struct drm_dp_aux *drm_aux;
102
103 /* dpcd raw data */
104 u8 dpcd[DP_RECEIVER_CAP_SIZE];
105
106 /* Link status */
107 u8 link_rate;
108 u8 lane_cnt;
109 u8 v_level;
110 u8 p_level;
111
112 /* Timing status */
113 u8 interlaced;
114 u32 pixel_rate; /* in kHz */
115 u32 color_depth;
116
117 struct edp_aux *aux;
118 struct edp_phy *phy;
119 };
120
121 struct edp_pixel_clk_div {
122 u32 rate; /* in kHz */
123 u32 m;
124 u32 n;
125 };
126
127 #define EDP_PIXEL_CLK_NUM 8
128 static const struct edp_pixel_clk_div clk_divs[2][EDP_PIXEL_CLK_NUM] = {
129 { /* Link clock = 162MHz, source clock = 810MHz */
130 {119000, 31, 211}, /* WSXGA+ 1680x1050@60Hz CVT */
131 {130250, 32, 199}, /* UXGA 1600x1200@60Hz CVT */
132 {148500, 11, 60}, /* FHD 1920x1080@60Hz */
133 {154000, 50, 263}, /* WUXGA 1920x1200@60Hz CVT */
134 {209250, 31, 120}, /* QXGA 2048x1536@60Hz CVT */
135 {268500, 119, 359}, /* WQXGA 2560x1600@60Hz CVT */
136 {138530, 33, 193}, /* AUO B116HAN03.0 Panel */
137 {141400, 48, 275}, /* AUO B133HTN01.2 Panel */
138 },
139 { /* Link clock = 270MHz, source clock = 675MHz */
140 {119000, 52, 295}, /* WSXGA+ 1680x1050@60Hz CVT */
141 {130250, 11, 57}, /* UXGA 1600x1200@60Hz CVT */
142 {148500, 11, 50}, /* FHD 1920x1080@60Hz */
143 {154000, 47, 206}, /* WUXGA 1920x1200@60Hz CVT */
144 {209250, 31, 100}, /* QXGA 2048x1536@60Hz CVT */
145 {268500, 107, 269}, /* WQXGA 2560x1600@60Hz CVT */
146 {138530, 63, 307}, /* AUO B116HAN03.0 Panel */
147 {141400, 53, 253}, /* AUO B133HTN01.2 Panel */
148 },
149 };
150
edp_clk_init(struct edp_ctrl * ctrl)151 static int edp_clk_init(struct edp_ctrl *ctrl)
152 {
153 struct platform_device *pdev = ctrl->pdev;
154 int ret;
155
156 ctrl->aux_clk = msm_clk_get(pdev, "core");
157 if (IS_ERR(ctrl->aux_clk)) {
158 ret = PTR_ERR(ctrl->aux_clk);
159 pr_err("%s: Can't find core clock, %d\n", __func__, ret);
160 ctrl->aux_clk = NULL;
161 return ret;
162 }
163
164 ctrl->pixel_clk = msm_clk_get(pdev, "pixel");
165 if (IS_ERR(ctrl->pixel_clk)) {
166 ret = PTR_ERR(ctrl->pixel_clk);
167 pr_err("%s: Can't find pixel clock, %d\n", __func__, ret);
168 ctrl->pixel_clk = NULL;
169 return ret;
170 }
171
172 ctrl->ahb_clk = msm_clk_get(pdev, "iface");
173 if (IS_ERR(ctrl->ahb_clk)) {
174 ret = PTR_ERR(ctrl->ahb_clk);
175 pr_err("%s: Can't find iface clock, %d\n", __func__, ret);
176 ctrl->ahb_clk = NULL;
177 return ret;
178 }
179
180 ctrl->link_clk = msm_clk_get(pdev, "link");
181 if (IS_ERR(ctrl->link_clk)) {
182 ret = PTR_ERR(ctrl->link_clk);
183 pr_err("%s: Can't find link clock, %d\n", __func__, ret);
184 ctrl->link_clk = NULL;
185 return ret;
186 }
187
188 /* need mdp core clock to receive irq */
189 ctrl->mdp_core_clk = msm_clk_get(pdev, "mdp_core");
190 if (IS_ERR(ctrl->mdp_core_clk)) {
191 ret = PTR_ERR(ctrl->mdp_core_clk);
192 pr_err("%s: Can't find mdp_core clock, %d\n", __func__, ret);
193 ctrl->mdp_core_clk = NULL;
194 return ret;
195 }
196
197 return 0;
198 }
199
edp_clk_enable(struct edp_ctrl * ctrl,u32 clk_mask)200 static int edp_clk_enable(struct edp_ctrl *ctrl, u32 clk_mask)
201 {
202 int ret;
203
204 DBG("mask=%x", clk_mask);
205 /* ahb_clk should be enabled first */
206 if (clk_mask & EDP_CLK_MASK_AHB) {
207 ret = clk_prepare_enable(ctrl->ahb_clk);
208 if (ret) {
209 pr_err("%s: Failed to enable ahb clk\n", __func__);
210 goto f0;
211 }
212 }
213 if (clk_mask & EDP_CLK_MASK_AUX) {
214 ret = clk_set_rate(ctrl->aux_clk, 19200000);
215 if (ret) {
216 pr_err("%s: Failed to set rate aux clk\n", __func__);
217 goto f1;
218 }
219 ret = clk_prepare_enable(ctrl->aux_clk);
220 if (ret) {
221 pr_err("%s: Failed to enable aux clk\n", __func__);
222 goto f1;
223 }
224 }
225 /* Need to set rate and enable link_clk prior to pixel_clk */
226 if (clk_mask & EDP_CLK_MASK_LINK) {
227 DBG("edp->link_clk, set_rate %ld",
228 (unsigned long)ctrl->link_rate * 27000000);
229 ret = clk_set_rate(ctrl->link_clk,
230 (unsigned long)ctrl->link_rate * 27000000);
231 if (ret) {
232 pr_err("%s: Failed to set rate to link clk\n",
233 __func__);
234 goto f2;
235 }
236
237 ret = clk_prepare_enable(ctrl->link_clk);
238 if (ret) {
239 pr_err("%s: Failed to enable link clk\n", __func__);
240 goto f2;
241 }
242 }
243 if (clk_mask & EDP_CLK_MASK_PIXEL) {
244 DBG("edp->pixel_clk, set_rate %ld",
245 (unsigned long)ctrl->pixel_rate * 1000);
246 ret = clk_set_rate(ctrl->pixel_clk,
247 (unsigned long)ctrl->pixel_rate * 1000);
248 if (ret) {
249 pr_err("%s: Failed to set rate to pixel clk\n",
250 __func__);
251 goto f3;
252 }
253
254 ret = clk_prepare_enable(ctrl->pixel_clk);
255 if (ret) {
256 pr_err("%s: Failed to enable pixel clk\n", __func__);
257 goto f3;
258 }
259 }
260 if (clk_mask & EDP_CLK_MASK_MDP_CORE) {
261 ret = clk_prepare_enable(ctrl->mdp_core_clk);
262 if (ret) {
263 pr_err("%s: Failed to enable mdp core clk\n", __func__);
264 goto f4;
265 }
266 }
267
268 return 0;
269
270 f4:
271 if (clk_mask & EDP_CLK_MASK_PIXEL)
272 clk_disable_unprepare(ctrl->pixel_clk);
273 f3:
274 if (clk_mask & EDP_CLK_MASK_LINK)
275 clk_disable_unprepare(ctrl->link_clk);
276 f2:
277 if (clk_mask & EDP_CLK_MASK_AUX)
278 clk_disable_unprepare(ctrl->aux_clk);
279 f1:
280 if (clk_mask & EDP_CLK_MASK_AHB)
281 clk_disable_unprepare(ctrl->ahb_clk);
282 f0:
283 return ret;
284 }
285
edp_clk_disable(struct edp_ctrl * ctrl,u32 clk_mask)286 static void edp_clk_disable(struct edp_ctrl *ctrl, u32 clk_mask)
287 {
288 if (clk_mask & EDP_CLK_MASK_MDP_CORE)
289 clk_disable_unprepare(ctrl->mdp_core_clk);
290 if (clk_mask & EDP_CLK_MASK_PIXEL)
291 clk_disable_unprepare(ctrl->pixel_clk);
292 if (clk_mask & EDP_CLK_MASK_LINK)
293 clk_disable_unprepare(ctrl->link_clk);
294 if (clk_mask & EDP_CLK_MASK_AUX)
295 clk_disable_unprepare(ctrl->aux_clk);
296 if (clk_mask & EDP_CLK_MASK_AHB)
297 clk_disable_unprepare(ctrl->ahb_clk);
298 }
299
edp_regulator_init(struct edp_ctrl * ctrl)300 static int edp_regulator_init(struct edp_ctrl *ctrl)
301 {
302 struct device *dev = &ctrl->pdev->dev;
303 int ret;
304
305 DBG("");
306 ctrl->vdda_vreg = devm_regulator_get(dev, "vdda");
307 ret = PTR_ERR_OR_ZERO(ctrl->vdda_vreg);
308 if (ret) {
309 pr_err("%s: Could not get vdda reg, ret = %d\n", __func__,
310 ret);
311 ctrl->vdda_vreg = NULL;
312 return ret;
313 }
314 ctrl->lvl_vreg = devm_regulator_get(dev, "lvl-vdd");
315 ret = PTR_ERR_OR_ZERO(ctrl->lvl_vreg);
316 if (ret) {
317 pr_err("%s: Could not get lvl-vdd reg, ret = %d\n", __func__,
318 ret);
319 ctrl->lvl_vreg = NULL;
320 return ret;
321 }
322
323 return 0;
324 }
325
edp_regulator_enable(struct edp_ctrl * ctrl)326 static int edp_regulator_enable(struct edp_ctrl *ctrl)
327 {
328 int ret;
329
330 ret = regulator_set_load(ctrl->vdda_vreg, VDDA_UA_ON_LOAD);
331 if (ret < 0) {
332 pr_err("%s: vdda_vreg set regulator mode failed.\n", __func__);
333 goto vdda_set_fail;
334 }
335
336 ret = regulator_enable(ctrl->vdda_vreg);
337 if (ret) {
338 pr_err("%s: Failed to enable vdda_vreg regulator.\n", __func__);
339 goto vdda_enable_fail;
340 }
341
342 ret = regulator_enable(ctrl->lvl_vreg);
343 if (ret) {
344 pr_err("Failed to enable lvl-vdd reg regulator, %d", ret);
345 goto lvl_enable_fail;
346 }
347
348 DBG("exit");
349 return 0;
350
351 lvl_enable_fail:
352 regulator_disable(ctrl->vdda_vreg);
353 vdda_enable_fail:
354 regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
355 vdda_set_fail:
356 return ret;
357 }
358
edp_regulator_disable(struct edp_ctrl * ctrl)359 static void edp_regulator_disable(struct edp_ctrl *ctrl)
360 {
361 regulator_disable(ctrl->lvl_vreg);
362 regulator_disable(ctrl->vdda_vreg);
363 regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
364 }
365
edp_gpio_config(struct edp_ctrl * ctrl)366 static int edp_gpio_config(struct edp_ctrl *ctrl)
367 {
368 struct device *dev = &ctrl->pdev->dev;
369 int ret;
370
371 ctrl->panel_hpd_gpio = devm_gpiod_get(dev, "panel-hpd", GPIOD_IN);
372 if (IS_ERR(ctrl->panel_hpd_gpio)) {
373 ret = PTR_ERR(ctrl->panel_hpd_gpio);
374 ctrl->panel_hpd_gpio = NULL;
375 pr_err("%s: cannot get panel-hpd-gpios, %d\n", __func__, ret);
376 return ret;
377 }
378
379 ctrl->panel_en_gpio = devm_gpiod_get(dev, "panel-en", GPIOD_OUT_LOW);
380 if (IS_ERR(ctrl->panel_en_gpio)) {
381 ret = PTR_ERR(ctrl->panel_en_gpio);
382 ctrl->panel_en_gpio = NULL;
383 pr_err("%s: cannot get panel-en-gpios, %d\n", __func__, ret);
384 return ret;
385 }
386
387 DBG("gpio on");
388
389 return 0;
390 }
391
edp_ctrl_irq_enable(struct edp_ctrl * ctrl,int enable)392 static void edp_ctrl_irq_enable(struct edp_ctrl *ctrl, int enable)
393 {
394 unsigned long flags;
395
396 DBG("%d", enable);
397 spin_lock_irqsave(&ctrl->irq_lock, flags);
398 if (enable) {
399 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, EDP_INTR_MASK1);
400 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, EDP_INTR_MASK2);
401 } else {
402 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, 0x0);
403 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, 0x0);
404 }
405 spin_unlock_irqrestore(&ctrl->irq_lock, flags);
406 DBG("exit");
407 }
408
edp_fill_link_cfg(struct edp_ctrl * ctrl)409 static void edp_fill_link_cfg(struct edp_ctrl *ctrl)
410 {
411 u32 prate;
412 u32 lrate;
413 u32 bpp;
414 u8 max_lane = ctrl->dp_link.num_lanes;
415 u8 lane;
416
417 prate = ctrl->pixel_rate;
418 bpp = ctrl->color_depth * 3;
419
420 /*
421 * By default, use the maximum link rate and minimum lane count,
422 * so that we can do rate down shift during link training.
423 */
424 ctrl->link_rate = drm_dp_link_rate_to_bw_code(ctrl->dp_link.rate);
425
426 prate *= bpp;
427 prate /= 8; /* in kByte */
428
429 lrate = 270000; /* in kHz */
430 lrate *= ctrl->link_rate;
431 lrate /= 10; /* in kByte, 10 bits --> 8 bits */
432
433 for (lane = 1; lane <= max_lane; lane <<= 1) {
434 if (lrate >= prate)
435 break;
436 lrate <<= 1;
437 }
438
439 ctrl->lane_cnt = lane;
440 DBG("rate=%d lane=%d", ctrl->link_rate, ctrl->lane_cnt);
441 }
442
edp_config_ctrl(struct edp_ctrl * ctrl)443 static void edp_config_ctrl(struct edp_ctrl *ctrl)
444 {
445 u32 data;
446 enum edp_color_depth depth;
447
448 data = EDP_CONFIGURATION_CTRL_LANES(ctrl->lane_cnt - 1);
449
450 if (ctrl->dp_link.capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
451 data |= EDP_CONFIGURATION_CTRL_ENHANCED_FRAMING;
452
453 depth = EDP_6BIT;
454 if (ctrl->color_depth == 8)
455 depth = EDP_8BIT;
456
457 data |= EDP_CONFIGURATION_CTRL_COLOR(depth);
458
459 if (!ctrl->interlaced) /* progressive */
460 data |= EDP_CONFIGURATION_CTRL_PROGRESSIVE;
461
462 data |= (EDP_CONFIGURATION_CTRL_SYNC_CLK |
463 EDP_CONFIGURATION_CTRL_STATIC_MVID);
464
465 edp_write(ctrl->base + REG_EDP_CONFIGURATION_CTRL, data);
466 }
467
edp_state_ctrl(struct edp_ctrl * ctrl,u32 state)468 static void edp_state_ctrl(struct edp_ctrl *ctrl, u32 state)
469 {
470 edp_write(ctrl->base + REG_EDP_STATE_CTRL, state);
471 /* Make sure H/W status is set */
472 wmb();
473 }
474
edp_lane_set_write(struct edp_ctrl * ctrl,u8 voltage_level,u8 pre_emphasis_level)475 static int edp_lane_set_write(struct edp_ctrl *ctrl,
476 u8 voltage_level, u8 pre_emphasis_level)
477 {
478 int i;
479 u8 buf[4];
480
481 if (voltage_level >= DPCD_LINK_VOLTAGE_MAX)
482 voltage_level |= 0x04;
483
484 if (pre_emphasis_level >= DPCD_LINK_PRE_EMPHASIS_MAX)
485 pre_emphasis_level |= 0x04;
486
487 pre_emphasis_level <<= 3;
488
489 for (i = 0; i < 4; i++)
490 buf[i] = voltage_level | pre_emphasis_level;
491
492 DBG("%s: p|v=0x%x", __func__, voltage_level | pre_emphasis_level);
493 if (drm_dp_dpcd_write(ctrl->drm_aux, 0x103, buf, 4) < 4) {
494 pr_err("%s: Set sw/pe to panel failed\n", __func__);
495 return -ENOLINK;
496 }
497
498 return 0;
499 }
500
edp_train_pattern_set_write(struct edp_ctrl * ctrl,u8 pattern)501 static int edp_train_pattern_set_write(struct edp_ctrl *ctrl, u8 pattern)
502 {
503 u8 p = pattern;
504
505 DBG("pattern=%x", p);
506 if (drm_dp_dpcd_write(ctrl->drm_aux,
507 DP_TRAINING_PATTERN_SET, &p, 1) < 1) {
508 pr_err("%s: Set training pattern to panel failed\n", __func__);
509 return -ENOLINK;
510 }
511
512 return 0;
513 }
514
edp_sink_train_set_adjust(struct edp_ctrl * ctrl,const u8 * link_status)515 static void edp_sink_train_set_adjust(struct edp_ctrl *ctrl,
516 const u8 *link_status)
517 {
518 int i;
519 u8 max = 0;
520 u8 data;
521
522 /* use the max level across lanes */
523 for (i = 0; i < ctrl->lane_cnt; i++) {
524 data = drm_dp_get_adjust_request_voltage(link_status, i);
525 DBG("lane=%d req_voltage_swing=0x%x", i, data);
526 if (max < data)
527 max = data;
528 }
529
530 ctrl->v_level = max >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
531
532 /* use the max level across lanes */
533 max = 0;
534 for (i = 0; i < ctrl->lane_cnt; i++) {
535 data = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
536 DBG("lane=%d req_pre_emphasis=0x%x", i, data);
537 if (max < data)
538 max = data;
539 }
540
541 ctrl->p_level = max >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
542 DBG("v_level=%d, p_level=%d", ctrl->v_level, ctrl->p_level);
543 }
544
edp_host_train_set(struct edp_ctrl * ctrl,u32 train)545 static void edp_host_train_set(struct edp_ctrl *ctrl, u32 train)
546 {
547 int cnt = 10;
548 u32 data;
549 u32 shift = train - 1;
550
551 DBG("train=%d", train);
552
553 edp_state_ctrl(ctrl, EDP_STATE_CTRL_TRAIN_PATTERN_1 << shift);
554 while (--cnt) {
555 data = edp_read(ctrl->base + REG_EDP_MAINLINK_READY);
556 if (data & (EDP_MAINLINK_READY_TRAIN_PATTERN_1_READY << shift))
557 break;
558 }
559
560 if (cnt == 0)
561 pr_err("%s: set link_train=%d failed\n", __func__, train);
562 }
563
564 static const u8 vm_pre_emphasis[4][4] = {
565 {0x03, 0x06, 0x09, 0x0C}, /* pe0, 0 db */
566 {0x03, 0x06, 0x09, 0xFF}, /* pe1, 3.5 db */
567 {0x03, 0x06, 0xFF, 0xFF}, /* pe2, 6.0 db */
568 {0x03, 0xFF, 0xFF, 0xFF} /* pe3, 9.5 db */
569 };
570
571 /* voltage swing, 0.2v and 1.0v are not support */
572 static const u8 vm_voltage_swing[4][4] = {
573 {0x14, 0x18, 0x1A, 0x1E}, /* sw0, 0.4v */
574 {0x18, 0x1A, 0x1E, 0xFF}, /* sw1, 0.6 v */
575 {0x1A, 0x1E, 0xFF, 0xFF}, /* sw1, 0.8 v */
576 {0x1E, 0xFF, 0xFF, 0xFF} /* sw1, 1.2 v, optional */
577 };
578
edp_voltage_pre_emphasise_set(struct edp_ctrl * ctrl)579 static int edp_voltage_pre_emphasise_set(struct edp_ctrl *ctrl)
580 {
581 u32 value0;
582 u32 value1;
583
584 DBG("v=%d p=%d", ctrl->v_level, ctrl->p_level);
585
586 value0 = vm_pre_emphasis[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
587 value1 = vm_voltage_swing[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
588
589 /* Configure host and panel only if both values are allowed */
590 if (value0 != 0xFF && value1 != 0xFF) {
591 msm_edp_phy_vm_pe_cfg(ctrl->phy, value0, value1);
592 return edp_lane_set_write(ctrl, ctrl->v_level, ctrl->p_level);
593 }
594
595 return -EINVAL;
596 }
597
edp_start_link_train_1(struct edp_ctrl * ctrl)598 static int edp_start_link_train_1(struct edp_ctrl *ctrl)
599 {
600 u8 link_status[DP_LINK_STATUS_SIZE];
601 u8 old_v_level;
602 int tries;
603 int ret;
604 int rlen;
605
606 DBG("");
607
608 edp_host_train_set(ctrl, DP_TRAINING_PATTERN_1);
609 ret = edp_voltage_pre_emphasise_set(ctrl);
610 if (ret)
611 return ret;
612 ret = edp_train_pattern_set_write(ctrl,
613 DP_TRAINING_PATTERN_1 | DP_RECOVERED_CLOCK_OUT_EN);
614 if (ret)
615 return ret;
616
617 tries = 0;
618 old_v_level = ctrl->v_level;
619 while (1) {
620 drm_dp_link_train_clock_recovery_delay(ctrl->dpcd);
621
622 rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
623 if (rlen < DP_LINK_STATUS_SIZE) {
624 pr_err("%s: read link status failed\n", __func__);
625 return -ENOLINK;
626 }
627 if (drm_dp_clock_recovery_ok(link_status, ctrl->lane_cnt)) {
628 ret = 0;
629 break;
630 }
631
632 if (ctrl->v_level == DPCD_LINK_VOLTAGE_MAX) {
633 ret = -1;
634 break;
635 }
636
637 if (old_v_level == ctrl->v_level) {
638 tries++;
639 if (tries >= 5) {
640 ret = -1;
641 break;
642 }
643 } else {
644 tries = 0;
645 old_v_level = ctrl->v_level;
646 }
647
648 edp_sink_train_set_adjust(ctrl, link_status);
649 ret = edp_voltage_pre_emphasise_set(ctrl);
650 if (ret)
651 return ret;
652 }
653
654 return ret;
655 }
656
edp_start_link_train_2(struct edp_ctrl * ctrl)657 static int edp_start_link_train_2(struct edp_ctrl *ctrl)
658 {
659 u8 link_status[DP_LINK_STATUS_SIZE];
660 int tries = 0;
661 int ret;
662 int rlen;
663
664 DBG("");
665
666 edp_host_train_set(ctrl, DP_TRAINING_PATTERN_2);
667 ret = edp_voltage_pre_emphasise_set(ctrl);
668 if (ret)
669 return ret;
670
671 ret = edp_train_pattern_set_write(ctrl,
672 DP_TRAINING_PATTERN_2 | DP_RECOVERED_CLOCK_OUT_EN);
673 if (ret)
674 return ret;
675
676 while (1) {
677 drm_dp_link_train_channel_eq_delay(ctrl->dpcd);
678
679 rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
680 if (rlen < DP_LINK_STATUS_SIZE) {
681 pr_err("%s: read link status failed\n", __func__);
682 return -ENOLINK;
683 }
684 if (drm_dp_channel_eq_ok(link_status, ctrl->lane_cnt)) {
685 ret = 0;
686 break;
687 }
688
689 tries++;
690 if (tries > 10) {
691 ret = -1;
692 break;
693 }
694
695 edp_sink_train_set_adjust(ctrl, link_status);
696 ret = edp_voltage_pre_emphasise_set(ctrl);
697 if (ret)
698 return ret;
699 }
700
701 return ret;
702 }
703
edp_link_rate_down_shift(struct edp_ctrl * ctrl)704 static int edp_link_rate_down_shift(struct edp_ctrl *ctrl)
705 {
706 u32 prate, lrate, bpp;
707 u8 rate, lane, max_lane;
708 int changed = 0;
709
710 rate = ctrl->link_rate;
711 lane = ctrl->lane_cnt;
712 max_lane = ctrl->dp_link.num_lanes;
713
714 bpp = ctrl->color_depth * 3;
715 prate = ctrl->pixel_rate;
716 prate *= bpp;
717 prate /= 8; /* in kByte */
718
719 if (rate > DP_LINK_BW_1_62 && rate <= EDP_LINK_BW_MAX) {
720 rate -= 4; /* reduce rate */
721 changed++;
722 }
723
724 if (changed) {
725 if (lane >= 1 && lane < max_lane)
726 lane <<= 1; /* increase lane */
727
728 lrate = 270000; /* in kHz */
729 lrate *= rate;
730 lrate /= 10; /* kByte, 10 bits --> 8 bits */
731 lrate *= lane;
732
733 DBG("new lrate=%u prate=%u(kHz) rate=%d lane=%d p=%u b=%d",
734 lrate, prate, rate, lane,
735 ctrl->pixel_rate,
736 bpp);
737
738 if (lrate > prate) {
739 ctrl->link_rate = rate;
740 ctrl->lane_cnt = lane;
741 DBG("new rate=%d %d", rate, lane);
742 return 0;
743 }
744 }
745
746 return -EINVAL;
747 }
748
edp_clear_training_pattern(struct edp_ctrl * ctrl)749 static int edp_clear_training_pattern(struct edp_ctrl *ctrl)
750 {
751 int ret;
752
753 ret = edp_train_pattern_set_write(ctrl, 0);
754
755 drm_dp_link_train_channel_eq_delay(ctrl->dpcd);
756
757 return ret;
758 }
759
edp_do_link_train(struct edp_ctrl * ctrl)760 static int edp_do_link_train(struct edp_ctrl *ctrl)
761 {
762 int ret;
763 struct drm_dp_link dp_link;
764
765 DBG("");
766 /*
767 * Set the current link rate and lane cnt to panel. They may have been
768 * adjusted and the values are different from them in DPCD CAP
769 */
770 dp_link.num_lanes = ctrl->lane_cnt;
771 dp_link.rate = drm_dp_bw_code_to_link_rate(ctrl->link_rate);
772 dp_link.capabilities = ctrl->dp_link.capabilities;
773 if (drm_dp_link_configure(ctrl->drm_aux, &dp_link) < 0)
774 return EDP_TRAIN_FAIL;
775
776 ctrl->v_level = 0; /* start from default level */
777 ctrl->p_level = 0;
778
779 edp_state_ctrl(ctrl, 0);
780 if (edp_clear_training_pattern(ctrl))
781 return EDP_TRAIN_FAIL;
782
783 ret = edp_start_link_train_1(ctrl);
784 if (ret < 0) {
785 if (edp_link_rate_down_shift(ctrl) == 0) {
786 DBG("link reconfig");
787 ret = EDP_TRAIN_RECONFIG;
788 goto clear;
789 } else {
790 pr_err("%s: Training 1 failed", __func__);
791 ret = EDP_TRAIN_FAIL;
792 goto clear;
793 }
794 }
795 DBG("Training 1 completed successfully");
796
797 edp_state_ctrl(ctrl, 0);
798 if (edp_clear_training_pattern(ctrl))
799 return EDP_TRAIN_FAIL;
800
801 ret = edp_start_link_train_2(ctrl);
802 if (ret < 0) {
803 if (edp_link_rate_down_shift(ctrl) == 0) {
804 DBG("link reconfig");
805 ret = EDP_TRAIN_RECONFIG;
806 goto clear;
807 } else {
808 pr_err("%s: Training 2 failed", __func__);
809 ret = EDP_TRAIN_FAIL;
810 goto clear;
811 }
812 }
813 DBG("Training 2 completed successfully");
814
815 edp_state_ctrl(ctrl, EDP_STATE_CTRL_SEND_VIDEO);
816 clear:
817 edp_clear_training_pattern(ctrl);
818
819 return ret;
820 }
821
edp_clock_synchrous(struct edp_ctrl * ctrl,int sync)822 static void edp_clock_synchrous(struct edp_ctrl *ctrl, int sync)
823 {
824 u32 data;
825 enum edp_color_depth depth;
826
827 data = edp_read(ctrl->base + REG_EDP_MISC1_MISC0);
828
829 if (sync)
830 data |= EDP_MISC1_MISC0_SYNC;
831 else
832 data &= ~EDP_MISC1_MISC0_SYNC;
833
834 /* only legacy rgb mode supported */
835 depth = EDP_6BIT; /* Default */
836 if (ctrl->color_depth == 8)
837 depth = EDP_8BIT;
838 else if (ctrl->color_depth == 10)
839 depth = EDP_10BIT;
840 else if (ctrl->color_depth == 12)
841 depth = EDP_12BIT;
842 else if (ctrl->color_depth == 16)
843 depth = EDP_16BIT;
844
845 data |= EDP_MISC1_MISC0_COLOR(depth);
846
847 edp_write(ctrl->base + REG_EDP_MISC1_MISC0, data);
848 }
849
edp_sw_mvid_nvid(struct edp_ctrl * ctrl,u32 m,u32 n)850 static int edp_sw_mvid_nvid(struct edp_ctrl *ctrl, u32 m, u32 n)
851 {
852 u32 n_multi, m_multi = 5;
853
854 if (ctrl->link_rate == DP_LINK_BW_1_62) {
855 n_multi = 1;
856 } else if (ctrl->link_rate == DP_LINK_BW_2_7) {
857 n_multi = 2;
858 } else {
859 pr_err("%s: Invalid link rate, %d\n", __func__,
860 ctrl->link_rate);
861 return -EINVAL;
862 }
863
864 edp_write(ctrl->base + REG_EDP_SOFTWARE_MVID, m * m_multi);
865 edp_write(ctrl->base + REG_EDP_SOFTWARE_NVID, n * n_multi);
866
867 return 0;
868 }
869
edp_mainlink_ctrl(struct edp_ctrl * ctrl,int enable)870 static void edp_mainlink_ctrl(struct edp_ctrl *ctrl, int enable)
871 {
872 u32 data = 0;
873
874 edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, EDP_MAINLINK_CTRL_RESET);
875 /* Make sure fully reset */
876 wmb();
877 usleep_range(500, 1000);
878
879 if (enable)
880 data |= EDP_MAINLINK_CTRL_ENABLE;
881
882 edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, data);
883 }
884
edp_ctrl_phy_aux_enable(struct edp_ctrl * ctrl,int enable)885 static void edp_ctrl_phy_aux_enable(struct edp_ctrl *ctrl, int enable)
886 {
887 if (enable) {
888 edp_regulator_enable(ctrl);
889 edp_clk_enable(ctrl, EDP_CLK_MASK_AUX_CHAN);
890 msm_edp_phy_ctrl(ctrl->phy, 1);
891 msm_edp_aux_ctrl(ctrl->aux, 1);
892 gpiod_set_value(ctrl->panel_en_gpio, 1);
893 } else {
894 gpiod_set_value(ctrl->panel_en_gpio, 0);
895 msm_edp_aux_ctrl(ctrl->aux, 0);
896 msm_edp_phy_ctrl(ctrl->phy, 0);
897 edp_clk_disable(ctrl, EDP_CLK_MASK_AUX_CHAN);
898 edp_regulator_disable(ctrl);
899 }
900 }
901
edp_ctrl_link_enable(struct edp_ctrl * ctrl,int enable)902 static void edp_ctrl_link_enable(struct edp_ctrl *ctrl, int enable)
903 {
904 u32 m, n;
905
906 if (enable) {
907 /* Enable link channel clocks */
908 edp_clk_enable(ctrl, EDP_CLK_MASK_LINK_CHAN);
909
910 msm_edp_phy_lane_power_ctrl(ctrl->phy, true, ctrl->lane_cnt);
911
912 msm_edp_phy_vm_pe_init(ctrl->phy);
913
914 /* Make sure phy is programed */
915 wmb();
916 msm_edp_phy_ready(ctrl->phy);
917
918 edp_config_ctrl(ctrl);
919 msm_edp_ctrl_pixel_clock_valid(ctrl, ctrl->pixel_rate, &m, &n);
920 edp_sw_mvid_nvid(ctrl, m, n);
921 edp_mainlink_ctrl(ctrl, 1);
922 } else {
923 edp_mainlink_ctrl(ctrl, 0);
924
925 msm_edp_phy_lane_power_ctrl(ctrl->phy, false, 0);
926 edp_clk_disable(ctrl, EDP_CLK_MASK_LINK_CHAN);
927 }
928 }
929
edp_ctrl_training(struct edp_ctrl * ctrl)930 static int edp_ctrl_training(struct edp_ctrl *ctrl)
931 {
932 int ret;
933
934 /* Do link training only when power is on */
935 if (!ctrl->power_on)
936 return -EINVAL;
937
938 train_start:
939 ret = edp_do_link_train(ctrl);
940 if (ret == EDP_TRAIN_RECONFIG) {
941 /* Re-configure main link */
942 edp_ctrl_irq_enable(ctrl, 0);
943 edp_ctrl_link_enable(ctrl, 0);
944 msm_edp_phy_ctrl(ctrl->phy, 0);
945
946 /* Make sure link is fully disabled */
947 wmb();
948 usleep_range(500, 1000);
949
950 msm_edp_phy_ctrl(ctrl->phy, 1);
951 edp_ctrl_link_enable(ctrl, 1);
952 edp_ctrl_irq_enable(ctrl, 1);
953 goto train_start;
954 }
955
956 return ret;
957 }
958
edp_ctrl_on_worker(struct work_struct * work)959 static void edp_ctrl_on_worker(struct work_struct *work)
960 {
961 struct edp_ctrl *ctrl = container_of(
962 work, struct edp_ctrl, on_work);
963 int ret;
964
965 mutex_lock(&ctrl->dev_mutex);
966
967 if (ctrl->power_on) {
968 DBG("already on");
969 goto unlock_ret;
970 }
971
972 edp_ctrl_phy_aux_enable(ctrl, 1);
973 edp_ctrl_link_enable(ctrl, 1);
974
975 edp_ctrl_irq_enable(ctrl, 1);
976 ret = drm_dp_link_power_up(ctrl->drm_aux, &ctrl->dp_link);
977 if (ret)
978 goto fail;
979
980 ctrl->power_on = true;
981
982 /* Start link training */
983 ret = edp_ctrl_training(ctrl);
984 if (ret != EDP_TRAIN_SUCCESS)
985 goto fail;
986
987 DBG("DONE");
988 goto unlock_ret;
989
990 fail:
991 edp_ctrl_irq_enable(ctrl, 0);
992 edp_ctrl_link_enable(ctrl, 0);
993 edp_ctrl_phy_aux_enable(ctrl, 0);
994 ctrl->power_on = false;
995 unlock_ret:
996 mutex_unlock(&ctrl->dev_mutex);
997 }
998
edp_ctrl_off_worker(struct work_struct * work)999 static void edp_ctrl_off_worker(struct work_struct *work)
1000 {
1001 struct edp_ctrl *ctrl = container_of(
1002 work, struct edp_ctrl, off_work);
1003 unsigned long time_left;
1004
1005 mutex_lock(&ctrl->dev_mutex);
1006
1007 if (!ctrl->power_on) {
1008 DBG("already off");
1009 goto unlock_ret;
1010 }
1011
1012 reinit_completion(&ctrl->idle_comp);
1013 edp_state_ctrl(ctrl, EDP_STATE_CTRL_PUSH_IDLE);
1014
1015 time_left = wait_for_completion_timeout(&ctrl->idle_comp,
1016 msecs_to_jiffies(500));
1017 if (!time_left)
1018 DBG("%s: idle pattern timedout\n", __func__);
1019
1020 edp_state_ctrl(ctrl, 0);
1021
1022 drm_dp_link_power_down(ctrl->drm_aux, &ctrl->dp_link);
1023
1024 edp_ctrl_irq_enable(ctrl, 0);
1025
1026 edp_ctrl_link_enable(ctrl, 0);
1027
1028 edp_ctrl_phy_aux_enable(ctrl, 0);
1029
1030 ctrl->power_on = false;
1031
1032 unlock_ret:
1033 mutex_unlock(&ctrl->dev_mutex);
1034 }
1035
msm_edp_ctrl_irq(struct edp_ctrl * ctrl)1036 irqreturn_t msm_edp_ctrl_irq(struct edp_ctrl *ctrl)
1037 {
1038 u32 isr1, isr2, mask1, mask2;
1039 u32 ack;
1040
1041 DBG("");
1042 spin_lock(&ctrl->irq_lock);
1043 isr1 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_1);
1044 isr2 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_2);
1045
1046 mask1 = isr1 & EDP_INTR_MASK1;
1047 mask2 = isr2 & EDP_INTR_MASK2;
1048
1049 isr1 &= ~mask1; /* remove masks bit */
1050 isr2 &= ~mask2;
1051
1052 DBG("isr=%x mask=%x isr2=%x mask2=%x",
1053 isr1, mask1, isr2, mask2);
1054
1055 ack = isr1 & EDP_INTR_STATUS1;
1056 ack <<= 1; /* ack bits */
1057 ack |= mask1;
1058 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, ack);
1059
1060 ack = isr2 & EDP_INTR_STATUS2;
1061 ack <<= 1; /* ack bits */
1062 ack |= mask2;
1063 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, ack);
1064 spin_unlock(&ctrl->irq_lock);
1065
1066 if (isr1 & EDP_INTERRUPT_REG_1_HPD)
1067 DBG("edp_hpd");
1068
1069 if (isr2 & EDP_INTERRUPT_REG_2_READY_FOR_VIDEO)
1070 DBG("edp_video_ready");
1071
1072 if (isr2 & EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT) {
1073 DBG("idle_patterns_sent");
1074 complete(&ctrl->idle_comp);
1075 }
1076
1077 msm_edp_aux_irq(ctrl->aux, isr1);
1078
1079 return IRQ_HANDLED;
1080 }
1081
msm_edp_ctrl_power(struct edp_ctrl * ctrl,bool on)1082 void msm_edp_ctrl_power(struct edp_ctrl *ctrl, bool on)
1083 {
1084 if (on)
1085 queue_work(ctrl->workqueue, &ctrl->on_work);
1086 else
1087 queue_work(ctrl->workqueue, &ctrl->off_work);
1088 }
1089
msm_edp_ctrl_init(struct msm_edp * edp)1090 int msm_edp_ctrl_init(struct msm_edp *edp)
1091 {
1092 struct edp_ctrl *ctrl = NULL;
1093 struct device *dev = &edp->pdev->dev;
1094 int ret;
1095
1096 if (!edp) {
1097 pr_err("%s: edp is NULL!\n", __func__);
1098 return -EINVAL;
1099 }
1100
1101 ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
1102 if (!ctrl)
1103 return -ENOMEM;
1104
1105 edp->ctrl = ctrl;
1106 ctrl->pdev = edp->pdev;
1107
1108 ctrl->base = msm_ioremap(ctrl->pdev, "edp", "eDP");
1109 if (IS_ERR(ctrl->base))
1110 return PTR_ERR(ctrl->base);
1111
1112 /* Get regulator, clock, gpio, pwm */
1113 ret = edp_regulator_init(ctrl);
1114 if (ret) {
1115 pr_err("%s:regulator init fail\n", __func__);
1116 return ret;
1117 }
1118 ret = edp_clk_init(ctrl);
1119 if (ret) {
1120 pr_err("%s:clk init fail\n", __func__);
1121 return ret;
1122 }
1123 ret = edp_gpio_config(ctrl);
1124 if (ret) {
1125 pr_err("%s:failed to configure GPIOs: %d", __func__, ret);
1126 return ret;
1127 }
1128
1129 /* Init aux and phy */
1130 ctrl->aux = msm_edp_aux_init(dev, ctrl->base, &ctrl->drm_aux);
1131 if (!ctrl->aux || !ctrl->drm_aux) {
1132 pr_err("%s:failed to init aux\n", __func__);
1133 return -ENOMEM;
1134 }
1135
1136 ctrl->phy = msm_edp_phy_init(dev, ctrl->base);
1137 if (!ctrl->phy) {
1138 pr_err("%s:failed to init phy\n", __func__);
1139 ret = -ENOMEM;
1140 goto err_destory_aux;
1141 }
1142
1143 spin_lock_init(&ctrl->irq_lock);
1144 mutex_init(&ctrl->dev_mutex);
1145 init_completion(&ctrl->idle_comp);
1146
1147 /* setup workqueue */
1148 ctrl->workqueue = alloc_ordered_workqueue("edp_drm_work", 0);
1149 INIT_WORK(&ctrl->on_work, edp_ctrl_on_worker);
1150 INIT_WORK(&ctrl->off_work, edp_ctrl_off_worker);
1151
1152 return 0;
1153
1154 err_destory_aux:
1155 msm_edp_aux_destroy(dev, ctrl->aux);
1156 ctrl->aux = NULL;
1157 return ret;
1158 }
1159
msm_edp_ctrl_destroy(struct edp_ctrl * ctrl)1160 void msm_edp_ctrl_destroy(struct edp_ctrl *ctrl)
1161 {
1162 if (!ctrl)
1163 return;
1164
1165 if (ctrl->workqueue) {
1166 flush_workqueue(ctrl->workqueue);
1167 destroy_workqueue(ctrl->workqueue);
1168 ctrl->workqueue = NULL;
1169 }
1170
1171 if (ctrl->aux) {
1172 msm_edp_aux_destroy(&ctrl->pdev->dev, ctrl->aux);
1173 ctrl->aux = NULL;
1174 }
1175
1176 kfree(ctrl->edid);
1177 ctrl->edid = NULL;
1178
1179 mutex_destroy(&ctrl->dev_mutex);
1180 }
1181
msm_edp_ctrl_panel_connected(struct edp_ctrl * ctrl)1182 bool msm_edp_ctrl_panel_connected(struct edp_ctrl *ctrl)
1183 {
1184 mutex_lock(&ctrl->dev_mutex);
1185 DBG("connect status = %d", ctrl->edp_connected);
1186 if (ctrl->edp_connected) {
1187 mutex_unlock(&ctrl->dev_mutex);
1188 return true;
1189 }
1190
1191 if (!ctrl->power_on) {
1192 edp_ctrl_phy_aux_enable(ctrl, 1);
1193 edp_ctrl_irq_enable(ctrl, 1);
1194 }
1195
1196 if (drm_dp_dpcd_read(ctrl->drm_aux, DP_DPCD_REV, ctrl->dpcd,
1197 DP_RECEIVER_CAP_SIZE) < DP_RECEIVER_CAP_SIZE) {
1198 pr_err("%s: AUX channel is NOT ready\n", __func__);
1199 memset(ctrl->dpcd, 0, DP_RECEIVER_CAP_SIZE);
1200 } else {
1201 ctrl->edp_connected = true;
1202 }
1203
1204 if (!ctrl->power_on) {
1205 edp_ctrl_irq_enable(ctrl, 0);
1206 edp_ctrl_phy_aux_enable(ctrl, 0);
1207 }
1208
1209 DBG("exit: connect status=%d", ctrl->edp_connected);
1210
1211 mutex_unlock(&ctrl->dev_mutex);
1212
1213 return ctrl->edp_connected;
1214 }
1215
msm_edp_ctrl_get_panel_info(struct edp_ctrl * ctrl,struct drm_connector * connector,struct edid ** edid)1216 int msm_edp_ctrl_get_panel_info(struct edp_ctrl *ctrl,
1217 struct drm_connector *connector, struct edid **edid)
1218 {
1219 int ret = 0;
1220
1221 mutex_lock(&ctrl->dev_mutex);
1222
1223 if (ctrl->edid) {
1224 if (edid) {
1225 DBG("Just return edid buffer");
1226 *edid = ctrl->edid;
1227 }
1228 goto unlock_ret;
1229 }
1230
1231 if (!ctrl->power_on) {
1232 edp_ctrl_phy_aux_enable(ctrl, 1);
1233 edp_ctrl_irq_enable(ctrl, 1);
1234 }
1235
1236 ret = drm_dp_link_probe(ctrl->drm_aux, &ctrl->dp_link);
1237 if (ret) {
1238 pr_err("%s: read dpcd cap failed, %d\n", __func__, ret);
1239 goto disable_ret;
1240 }
1241
1242 /* Initialize link rate as panel max link rate */
1243 ctrl->link_rate = drm_dp_link_rate_to_bw_code(ctrl->dp_link.rate);
1244
1245 ctrl->edid = drm_get_edid(connector, &ctrl->drm_aux->ddc);
1246 if (!ctrl->edid) {
1247 pr_err("%s: edid read fail\n", __func__);
1248 goto disable_ret;
1249 }
1250
1251 if (edid)
1252 *edid = ctrl->edid;
1253
1254 disable_ret:
1255 if (!ctrl->power_on) {
1256 edp_ctrl_irq_enable(ctrl, 0);
1257 edp_ctrl_phy_aux_enable(ctrl, 0);
1258 }
1259 unlock_ret:
1260 mutex_unlock(&ctrl->dev_mutex);
1261 return ret;
1262 }
1263
msm_edp_ctrl_timing_cfg(struct edp_ctrl * ctrl,const struct drm_display_mode * mode,const struct drm_display_info * info)1264 int msm_edp_ctrl_timing_cfg(struct edp_ctrl *ctrl,
1265 const struct drm_display_mode *mode,
1266 const struct drm_display_info *info)
1267 {
1268 u32 hstart_from_sync, vstart_from_sync;
1269 u32 data;
1270 int ret = 0;
1271
1272 mutex_lock(&ctrl->dev_mutex);
1273 /*
1274 * Need to keep color depth, pixel rate and
1275 * interlaced information in ctrl context
1276 */
1277 ctrl->color_depth = info->bpc;
1278 ctrl->pixel_rate = mode->clock;
1279 ctrl->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1280
1281 /* Fill initial link config based on passed in timing */
1282 edp_fill_link_cfg(ctrl);
1283
1284 if (edp_clk_enable(ctrl, EDP_CLK_MASK_AHB)) {
1285 pr_err("%s, fail to prepare enable ahb clk\n", __func__);
1286 ret = -EINVAL;
1287 goto unlock_ret;
1288 }
1289 edp_clock_synchrous(ctrl, 1);
1290
1291 /* Configure eDP timing to HW */
1292 edp_write(ctrl->base + REG_EDP_TOTAL_HOR_VER,
1293 EDP_TOTAL_HOR_VER_HORIZ(mode->htotal) |
1294 EDP_TOTAL_HOR_VER_VERT(mode->vtotal));
1295
1296 vstart_from_sync = mode->vtotal - mode->vsync_start;
1297 hstart_from_sync = mode->htotal - mode->hsync_start;
1298 edp_write(ctrl->base + REG_EDP_START_HOR_VER_FROM_SYNC,
1299 EDP_START_HOR_VER_FROM_SYNC_HORIZ(hstart_from_sync) |
1300 EDP_START_HOR_VER_FROM_SYNC_VERT(vstart_from_sync));
1301
1302 data = EDP_HSYNC_VSYNC_WIDTH_POLARITY_VERT(
1303 mode->vsync_end - mode->vsync_start);
1304 data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_HORIZ(
1305 mode->hsync_end - mode->hsync_start);
1306 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1307 data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NVSYNC;
1308 if (mode->flags & DRM_MODE_FLAG_NHSYNC)
1309 data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NHSYNC;
1310 edp_write(ctrl->base + REG_EDP_HSYNC_VSYNC_WIDTH_POLARITY, data);
1311
1312 edp_write(ctrl->base + REG_EDP_ACTIVE_HOR_VER,
1313 EDP_ACTIVE_HOR_VER_HORIZ(mode->hdisplay) |
1314 EDP_ACTIVE_HOR_VER_VERT(mode->vdisplay));
1315
1316 edp_clk_disable(ctrl, EDP_CLK_MASK_AHB);
1317
1318 unlock_ret:
1319 mutex_unlock(&ctrl->dev_mutex);
1320 return ret;
1321 }
1322
msm_edp_ctrl_pixel_clock_valid(struct edp_ctrl * ctrl,u32 pixel_rate,u32 * pm,u32 * pn)1323 bool msm_edp_ctrl_pixel_clock_valid(struct edp_ctrl *ctrl,
1324 u32 pixel_rate, u32 *pm, u32 *pn)
1325 {
1326 const struct edp_pixel_clk_div *divs;
1327 u32 err = 1; /* 1% error tolerance */
1328 u32 clk_err;
1329 int i;
1330
1331 if (ctrl->link_rate == DP_LINK_BW_1_62) {
1332 divs = clk_divs[0];
1333 } else if (ctrl->link_rate == DP_LINK_BW_2_7) {
1334 divs = clk_divs[1];
1335 } else {
1336 pr_err("%s: Invalid link rate,%d\n", __func__, ctrl->link_rate);
1337 return false;
1338 }
1339
1340 for (i = 0; i < EDP_PIXEL_CLK_NUM; i++) {
1341 clk_err = abs(divs[i].rate - pixel_rate);
1342 if ((divs[i].rate * err / 100) >= clk_err) {
1343 if (pm)
1344 *pm = divs[i].m;
1345 if (pn)
1346 *pn = divs[i].n;
1347 return true;
1348 }
1349 }
1350
1351 DBG("pixel clock %d(kHz) not supported", pixel_rate);
1352
1353 return false;
1354 }
1355
1356
