1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2014-2015, The Linux Foundation. All rights reserved.
4 */
5
6 #include <linux/clk.h>
7 #include <linux/gpio/consumer.h>
8 #include <linux/regulator/consumer.h>
9 #include <drm/drm_crtc.h>
10 #include <drm/drm_dp_helper.h>
11 #include <drm/drm_edid.h>
12
13 #include "edp.h"
14 #include "edp.xml.h"
15
16 #define VDDA_UA_ON_LOAD 100000 /* uA units */
17 #define VDDA_UA_OFF_LOAD 100 /* uA units */
18
19 #define DPCD_LINK_VOLTAGE_MAX 4
20 #define DPCD_LINK_PRE_EMPHASIS_MAX 4
21
22 #define EDP_LINK_BW_MAX DP_LINK_BW_2_7
23
24 /* Link training return value */
25 #define EDP_TRAIN_FAIL -1
26 #define EDP_TRAIN_SUCCESS 0
27 #define EDP_TRAIN_RECONFIG 1
28
29 #define EDP_CLK_MASK_AHB BIT(0)
30 #define EDP_CLK_MASK_AUX BIT(1)
31 #define EDP_CLK_MASK_LINK BIT(2)
32 #define EDP_CLK_MASK_PIXEL BIT(3)
33 #define EDP_CLK_MASK_MDP_CORE BIT(4)
34 #define EDP_CLK_MASK_LINK_CHAN (EDP_CLK_MASK_LINK | EDP_CLK_MASK_PIXEL)
35 #define EDP_CLK_MASK_AUX_CHAN \
36 (EDP_CLK_MASK_AHB | EDP_CLK_MASK_AUX | EDP_CLK_MASK_MDP_CORE)
37 #define EDP_CLK_MASK_ALL (EDP_CLK_MASK_AUX_CHAN | EDP_CLK_MASK_LINK_CHAN)
38
39 #define EDP_BACKLIGHT_MAX 255
40
41 #define EDP_INTR_STATUS1 \
42 (EDP_INTERRUPT_REG_1_HPD | EDP_INTERRUPT_REG_1_AUX_I2C_DONE | \
43 EDP_INTERRUPT_REG_1_WRONG_ADDR | EDP_INTERRUPT_REG_1_TIMEOUT | \
44 EDP_INTERRUPT_REG_1_NACK_DEFER | EDP_INTERRUPT_REG_1_WRONG_DATA_CNT | \
45 EDP_INTERRUPT_REG_1_I2C_NACK | EDP_INTERRUPT_REG_1_I2C_DEFER | \
46 EDP_INTERRUPT_REG_1_PLL_UNLOCK | EDP_INTERRUPT_REG_1_AUX_ERROR)
47 #define EDP_INTR_MASK1 (EDP_INTR_STATUS1 << 2)
48 #define EDP_INTR_STATUS2 \
49 (EDP_INTERRUPT_REG_2_READY_FOR_VIDEO | \
50 EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT | \
51 EDP_INTERRUPT_REG_2_FRAME_END | EDP_INTERRUPT_REG_2_CRC_UPDATED)
52 #define EDP_INTR_MASK2 (EDP_INTR_STATUS2 << 2)
53
54 struct edp_ctrl {
55 struct platform_device *pdev;
56
57 void __iomem *base;
58
59 /* regulators */
60 struct regulator *vdda_vreg; /* 1.8 V */
61 struct regulator *lvl_vreg;
62
63 /* clocks */
64 struct clk *aux_clk;
65 struct clk *pixel_clk;
66 struct clk *ahb_clk;
67 struct clk *link_clk;
68 struct clk *mdp_core_clk;
69
70 /* gpios */
71 struct gpio_desc *panel_en_gpio;
72 struct gpio_desc *panel_hpd_gpio;
73
74 /* completion and mutex */
75 struct completion idle_comp;
76 struct mutex dev_mutex; /* To protect device power status */
77
78 /* work queue */
79 struct work_struct on_work;
80 struct work_struct off_work;
81 struct workqueue_struct *workqueue;
82
83 /* Interrupt register lock */
84 spinlock_t irq_lock;
85
86 bool edp_connected;
87 bool power_on;
88
89 /* edid raw data */
90 struct edid *edid;
91
92 struct drm_dp_link dp_link;
93 struct drm_dp_aux *drm_aux;
94
95 /* dpcd raw data */
96 u8 dpcd[DP_RECEIVER_CAP_SIZE];
97
98 /* Link status */
99 u8 link_rate;
100 u8 lane_cnt;
101 u8 v_level;
102 u8 p_level;
103
104 /* Timing status */
105 u8 interlaced;
106 u32 pixel_rate; /* in kHz */
107 u32 color_depth;
108
109 struct edp_aux *aux;
110 struct edp_phy *phy;
111 };
112
113 struct edp_pixel_clk_div {
114 u32 rate; /* in kHz */
115 u32 m;
116 u32 n;
117 };
118
119 #define EDP_PIXEL_CLK_NUM 8
120 static const struct edp_pixel_clk_div clk_divs[2][EDP_PIXEL_CLK_NUM] = {
121 { /* Link clock = 162MHz, source clock = 810MHz */
122 {119000, 31, 211}, /* WSXGA+ 1680x1050@60Hz CVT */
123 {130250, 32, 199}, /* UXGA 1600x1200@60Hz CVT */
124 {148500, 11, 60}, /* FHD 1920x1080@60Hz */
125 {154000, 50, 263}, /* WUXGA 1920x1200@60Hz CVT */
126 {209250, 31, 120}, /* QXGA 2048x1536@60Hz CVT */
127 {268500, 119, 359}, /* WQXGA 2560x1600@60Hz CVT */
128 {138530, 33, 193}, /* AUO B116HAN03.0 Panel */
129 {141400, 48, 275}, /* AUO B133HTN01.2 Panel */
130 },
131 { /* Link clock = 270MHz, source clock = 675MHz */
132 {119000, 52, 295}, /* WSXGA+ 1680x1050@60Hz CVT */
133 {130250, 11, 57}, /* UXGA 1600x1200@60Hz CVT */
134 {148500, 11, 50}, /* FHD 1920x1080@60Hz */
135 {154000, 47, 206}, /* WUXGA 1920x1200@60Hz CVT */
136 {209250, 31, 100}, /* QXGA 2048x1536@60Hz CVT */
137 {268500, 107, 269}, /* WQXGA 2560x1600@60Hz CVT */
138 {138530, 63, 307}, /* AUO B116HAN03.0 Panel */
139 {141400, 53, 253}, /* AUO B133HTN01.2 Panel */
140 },
141 };
142
edp_clk_init(struct edp_ctrl * ctrl)143 static int edp_clk_init(struct edp_ctrl *ctrl)
144 {
145 struct platform_device *pdev = ctrl->pdev;
146 int ret;
147
148 ctrl->aux_clk = msm_clk_get(pdev, "core");
149 if (IS_ERR(ctrl->aux_clk)) {
150 ret = PTR_ERR(ctrl->aux_clk);
151 pr_err("%s: Can't find core clock, %d\n", __func__, ret);
152 ctrl->aux_clk = NULL;
153 return ret;
154 }
155
156 ctrl->pixel_clk = msm_clk_get(pdev, "pixel");
157 if (IS_ERR(ctrl->pixel_clk)) {
158 ret = PTR_ERR(ctrl->pixel_clk);
159 pr_err("%s: Can't find pixel clock, %d\n", __func__, ret);
160 ctrl->pixel_clk = NULL;
161 return ret;
162 }
163
164 ctrl->ahb_clk = msm_clk_get(pdev, "iface");
165 if (IS_ERR(ctrl->ahb_clk)) {
166 ret = PTR_ERR(ctrl->ahb_clk);
167 pr_err("%s: Can't find iface clock, %d\n", __func__, ret);
168 ctrl->ahb_clk = NULL;
169 return ret;
170 }
171
172 ctrl->link_clk = msm_clk_get(pdev, "link");
173 if (IS_ERR(ctrl->link_clk)) {
174 ret = PTR_ERR(ctrl->link_clk);
175 pr_err("%s: Can't find link clock, %d\n", __func__, ret);
176 ctrl->link_clk = NULL;
177 return ret;
178 }
179
180 /* need mdp core clock to receive irq */
181 ctrl->mdp_core_clk = msm_clk_get(pdev, "mdp_core");
182 if (IS_ERR(ctrl->mdp_core_clk)) {
183 ret = PTR_ERR(ctrl->mdp_core_clk);
184 pr_err("%s: Can't find mdp_core clock, %d\n", __func__, ret);
185 ctrl->mdp_core_clk = NULL;
186 return ret;
187 }
188
189 return 0;
190 }
191
edp_clk_enable(struct edp_ctrl * ctrl,u32 clk_mask)192 static int edp_clk_enable(struct edp_ctrl *ctrl, u32 clk_mask)
193 {
194 int ret;
195
196 DBG("mask=%x", clk_mask);
197 /* ahb_clk should be enabled first */
198 if (clk_mask & EDP_CLK_MASK_AHB) {
199 ret = clk_prepare_enable(ctrl->ahb_clk);
200 if (ret) {
201 pr_err("%s: Failed to enable ahb clk\n", __func__);
202 goto f0;
203 }
204 }
205 if (clk_mask & EDP_CLK_MASK_AUX) {
206 ret = clk_set_rate(ctrl->aux_clk, 19200000);
207 if (ret) {
208 pr_err("%s: Failed to set rate aux clk\n", __func__);
209 goto f1;
210 }
211 ret = clk_prepare_enable(ctrl->aux_clk);
212 if (ret) {
213 pr_err("%s: Failed to enable aux clk\n", __func__);
214 goto f1;
215 }
216 }
217 /* Need to set rate and enable link_clk prior to pixel_clk */
218 if (clk_mask & EDP_CLK_MASK_LINK) {
219 DBG("edp->link_clk, set_rate %ld",
220 (unsigned long)ctrl->link_rate * 27000000);
221 ret = clk_set_rate(ctrl->link_clk,
222 (unsigned long)ctrl->link_rate * 27000000);
223 if (ret) {
224 pr_err("%s: Failed to set rate to link clk\n",
225 __func__);
226 goto f2;
227 }
228
229 ret = clk_prepare_enable(ctrl->link_clk);
230 if (ret) {
231 pr_err("%s: Failed to enable link clk\n", __func__);
232 goto f2;
233 }
234 }
235 if (clk_mask & EDP_CLK_MASK_PIXEL) {
236 DBG("edp->pixel_clk, set_rate %ld",
237 (unsigned long)ctrl->pixel_rate * 1000);
238 ret = clk_set_rate(ctrl->pixel_clk,
239 (unsigned long)ctrl->pixel_rate * 1000);
240 if (ret) {
241 pr_err("%s: Failed to set rate to pixel clk\n",
242 __func__);
243 goto f3;
244 }
245
246 ret = clk_prepare_enable(ctrl->pixel_clk);
247 if (ret) {
248 pr_err("%s: Failed to enable pixel clk\n", __func__);
249 goto f3;
250 }
251 }
252 if (clk_mask & EDP_CLK_MASK_MDP_CORE) {
253 ret = clk_prepare_enable(ctrl->mdp_core_clk);
254 if (ret) {
255 pr_err("%s: Failed to enable mdp core clk\n", __func__);
256 goto f4;
257 }
258 }
259
260 return 0;
261
262 f4:
263 if (clk_mask & EDP_CLK_MASK_PIXEL)
264 clk_disable_unprepare(ctrl->pixel_clk);
265 f3:
266 if (clk_mask & EDP_CLK_MASK_LINK)
267 clk_disable_unprepare(ctrl->link_clk);
268 f2:
269 if (clk_mask & EDP_CLK_MASK_AUX)
270 clk_disable_unprepare(ctrl->aux_clk);
271 f1:
272 if (clk_mask & EDP_CLK_MASK_AHB)
273 clk_disable_unprepare(ctrl->ahb_clk);
274 f0:
275 return ret;
276 }
277
edp_clk_disable(struct edp_ctrl * ctrl,u32 clk_mask)278 static void edp_clk_disable(struct edp_ctrl *ctrl, u32 clk_mask)
279 {
280 if (clk_mask & EDP_CLK_MASK_MDP_CORE)
281 clk_disable_unprepare(ctrl->mdp_core_clk);
282 if (clk_mask & EDP_CLK_MASK_PIXEL)
283 clk_disable_unprepare(ctrl->pixel_clk);
284 if (clk_mask & EDP_CLK_MASK_LINK)
285 clk_disable_unprepare(ctrl->link_clk);
286 if (clk_mask & EDP_CLK_MASK_AUX)
287 clk_disable_unprepare(ctrl->aux_clk);
288 if (clk_mask & EDP_CLK_MASK_AHB)
289 clk_disable_unprepare(ctrl->ahb_clk);
290 }
291
edp_regulator_init(struct edp_ctrl * ctrl)292 static int edp_regulator_init(struct edp_ctrl *ctrl)
293 {
294 struct device *dev = &ctrl->pdev->dev;
295 int ret;
296
297 DBG("");
298 ctrl->vdda_vreg = devm_regulator_get(dev, "vdda");
299 ret = PTR_ERR_OR_ZERO(ctrl->vdda_vreg);
300 if (ret) {
301 pr_err("%s: Could not get vdda reg, ret = %d\n", __func__,
302 ret);
303 ctrl->vdda_vreg = NULL;
304 return ret;
305 }
306 ctrl->lvl_vreg = devm_regulator_get(dev, "lvl-vdd");
307 ret = PTR_ERR_OR_ZERO(ctrl->lvl_vreg);
308 if (ret) {
309 pr_err("%s: Could not get lvl-vdd reg, ret = %d\n", __func__,
310 ret);
311 ctrl->lvl_vreg = NULL;
312 return ret;
313 }
314
315 return 0;
316 }
317
edp_regulator_enable(struct edp_ctrl * ctrl)318 static int edp_regulator_enable(struct edp_ctrl *ctrl)
319 {
320 int ret;
321
322 ret = regulator_set_load(ctrl->vdda_vreg, VDDA_UA_ON_LOAD);
323 if (ret < 0) {
324 pr_err("%s: vdda_vreg set regulator mode failed.\n", __func__);
325 goto vdda_set_fail;
326 }
327
328 ret = regulator_enable(ctrl->vdda_vreg);
329 if (ret) {
330 pr_err("%s: Failed to enable vdda_vreg regulator.\n", __func__);
331 goto vdda_enable_fail;
332 }
333
334 ret = regulator_enable(ctrl->lvl_vreg);
335 if (ret) {
336 pr_err("Failed to enable lvl-vdd reg regulator, %d", ret);
337 goto lvl_enable_fail;
338 }
339
340 DBG("exit");
341 return 0;
342
343 lvl_enable_fail:
344 regulator_disable(ctrl->vdda_vreg);
345 vdda_enable_fail:
346 regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
347 vdda_set_fail:
348 return ret;
349 }
350
edp_regulator_disable(struct edp_ctrl * ctrl)351 static void edp_regulator_disable(struct edp_ctrl *ctrl)
352 {
353 regulator_disable(ctrl->lvl_vreg);
354 regulator_disable(ctrl->vdda_vreg);
355 regulator_set_load(ctrl->vdda_vreg, VDDA_UA_OFF_LOAD);
356 }
357
edp_gpio_config(struct edp_ctrl * ctrl)358 static int edp_gpio_config(struct edp_ctrl *ctrl)
359 {
360 struct device *dev = &ctrl->pdev->dev;
361 int ret;
362
363 ctrl->panel_hpd_gpio = devm_gpiod_get(dev, "panel-hpd", GPIOD_IN);
364 if (IS_ERR(ctrl->panel_hpd_gpio)) {
365 ret = PTR_ERR(ctrl->panel_hpd_gpio);
366 ctrl->panel_hpd_gpio = NULL;
367 pr_err("%s: cannot get panel-hpd-gpios, %d\n", __func__, ret);
368 return ret;
369 }
370
371 ctrl->panel_en_gpio = devm_gpiod_get(dev, "panel-en", GPIOD_OUT_LOW);
372 if (IS_ERR(ctrl->panel_en_gpio)) {
373 ret = PTR_ERR(ctrl->panel_en_gpio);
374 ctrl->panel_en_gpio = NULL;
375 pr_err("%s: cannot get panel-en-gpios, %d\n", __func__, ret);
376 return ret;
377 }
378
379 DBG("gpio on");
380
381 return 0;
382 }
383
edp_ctrl_irq_enable(struct edp_ctrl * ctrl,int enable)384 static void edp_ctrl_irq_enable(struct edp_ctrl *ctrl, int enable)
385 {
386 unsigned long flags;
387
388 DBG("%d", enable);
389 spin_lock_irqsave(&ctrl->irq_lock, flags);
390 if (enable) {
391 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, EDP_INTR_MASK1);
392 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, EDP_INTR_MASK2);
393 } else {
394 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, 0x0);
395 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, 0x0);
396 }
397 spin_unlock_irqrestore(&ctrl->irq_lock, flags);
398 DBG("exit");
399 }
400
edp_fill_link_cfg(struct edp_ctrl * ctrl)401 static void edp_fill_link_cfg(struct edp_ctrl *ctrl)
402 {
403 u32 prate;
404 u32 lrate;
405 u32 bpp;
406 u8 max_lane = ctrl->dp_link.num_lanes;
407 u8 lane;
408
409 prate = ctrl->pixel_rate;
410 bpp = ctrl->color_depth * 3;
411
412 /*
413 * By default, use the maximum link rate and minimum lane count,
414 * so that we can do rate down shift during link training.
415 */
416 ctrl->link_rate = drm_dp_link_rate_to_bw_code(ctrl->dp_link.rate);
417
418 prate *= bpp;
419 prate /= 8; /* in kByte */
420
421 lrate = 270000; /* in kHz */
422 lrate *= ctrl->link_rate;
423 lrate /= 10; /* in kByte, 10 bits --> 8 bits */
424
425 for (lane = 1; lane <= max_lane; lane <<= 1) {
426 if (lrate >= prate)
427 break;
428 lrate <<= 1;
429 }
430
431 ctrl->lane_cnt = lane;
432 DBG("rate=%d lane=%d", ctrl->link_rate, ctrl->lane_cnt);
433 }
434
edp_config_ctrl(struct edp_ctrl * ctrl)435 static void edp_config_ctrl(struct edp_ctrl *ctrl)
436 {
437 u32 data;
438 enum edp_color_depth depth;
439
440 data = EDP_CONFIGURATION_CTRL_LANES(ctrl->lane_cnt - 1);
441
442 if (ctrl->dp_link.capabilities & DP_LINK_CAP_ENHANCED_FRAMING)
443 data |= EDP_CONFIGURATION_CTRL_ENHANCED_FRAMING;
444
445 depth = EDP_6BIT;
446 if (ctrl->color_depth == 8)
447 depth = EDP_8BIT;
448
449 data |= EDP_CONFIGURATION_CTRL_COLOR(depth);
450
451 if (!ctrl->interlaced) /* progressive */
452 data |= EDP_CONFIGURATION_CTRL_PROGRESSIVE;
453
454 data |= (EDP_CONFIGURATION_CTRL_SYNC_CLK |
455 EDP_CONFIGURATION_CTRL_STATIC_MVID);
456
457 edp_write(ctrl->base + REG_EDP_CONFIGURATION_CTRL, data);
458 }
459
edp_state_ctrl(struct edp_ctrl * ctrl,u32 state)460 static void edp_state_ctrl(struct edp_ctrl *ctrl, u32 state)
461 {
462 edp_write(ctrl->base + REG_EDP_STATE_CTRL, state);
463 /* Make sure H/W status is set */
464 wmb();
465 }
466
edp_lane_set_write(struct edp_ctrl * ctrl,u8 voltage_level,u8 pre_emphasis_level)467 static int edp_lane_set_write(struct edp_ctrl *ctrl,
468 u8 voltage_level, u8 pre_emphasis_level)
469 {
470 int i;
471 u8 buf[4];
472
473 if (voltage_level >= DPCD_LINK_VOLTAGE_MAX)
474 voltage_level |= 0x04;
475
476 if (pre_emphasis_level >= DPCD_LINK_PRE_EMPHASIS_MAX)
477 pre_emphasis_level |= 0x04;
478
479 pre_emphasis_level <<= 3;
480
481 for (i = 0; i < 4; i++)
482 buf[i] = voltage_level | pre_emphasis_level;
483
484 DBG("%s: p|v=0x%x", __func__, voltage_level | pre_emphasis_level);
485 if (drm_dp_dpcd_write(ctrl->drm_aux, 0x103, buf, 4) < 4) {
486 pr_err("%s: Set sw/pe to panel failed\n", __func__);
487 return -ENOLINK;
488 }
489
490 return 0;
491 }
492
edp_train_pattern_set_write(struct edp_ctrl * ctrl,u8 pattern)493 static int edp_train_pattern_set_write(struct edp_ctrl *ctrl, u8 pattern)
494 {
495 u8 p = pattern;
496
497 DBG("pattern=%x", p);
498 if (drm_dp_dpcd_write(ctrl->drm_aux,
499 DP_TRAINING_PATTERN_SET, &p, 1) < 1) {
500 pr_err("%s: Set training pattern to panel failed\n", __func__);
501 return -ENOLINK;
502 }
503
504 return 0;
505 }
506
edp_sink_train_set_adjust(struct edp_ctrl * ctrl,const u8 * link_status)507 static void edp_sink_train_set_adjust(struct edp_ctrl *ctrl,
508 const u8 *link_status)
509 {
510 int i;
511 u8 max = 0;
512 u8 data;
513
514 /* use the max level across lanes */
515 for (i = 0; i < ctrl->lane_cnt; i++) {
516 data = drm_dp_get_adjust_request_voltage(link_status, i);
517 DBG("lane=%d req_voltage_swing=0x%x", i, data);
518 if (max < data)
519 max = data;
520 }
521
522 ctrl->v_level = max >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
523
524 /* use the max level across lanes */
525 max = 0;
526 for (i = 0; i < ctrl->lane_cnt; i++) {
527 data = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
528 DBG("lane=%d req_pre_emphasis=0x%x", i, data);
529 if (max < data)
530 max = data;
531 }
532
533 ctrl->p_level = max >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
534 DBG("v_level=%d, p_level=%d", ctrl->v_level, ctrl->p_level);
535 }
536
edp_host_train_set(struct edp_ctrl * ctrl,u32 train)537 static void edp_host_train_set(struct edp_ctrl *ctrl, u32 train)
538 {
539 int cnt = 10;
540 u32 data;
541 u32 shift = train - 1;
542
543 DBG("train=%d", train);
544
545 edp_state_ctrl(ctrl, EDP_STATE_CTRL_TRAIN_PATTERN_1 << shift);
546 while (--cnt) {
547 data = edp_read(ctrl->base + REG_EDP_MAINLINK_READY);
548 if (data & (EDP_MAINLINK_READY_TRAIN_PATTERN_1_READY << shift))
549 break;
550 }
551
552 if (cnt == 0)
553 pr_err("%s: set link_train=%d failed\n", __func__, train);
554 }
555
556 static const u8 vm_pre_emphasis[4][4] = {
557 {0x03, 0x06, 0x09, 0x0C}, /* pe0, 0 db */
558 {0x03, 0x06, 0x09, 0xFF}, /* pe1, 3.5 db */
559 {0x03, 0x06, 0xFF, 0xFF}, /* pe2, 6.0 db */
560 {0x03, 0xFF, 0xFF, 0xFF} /* pe3, 9.5 db */
561 };
562
563 /* voltage swing, 0.2v and 1.0v are not support */
564 static const u8 vm_voltage_swing[4][4] = {
565 {0x14, 0x18, 0x1A, 0x1E}, /* sw0, 0.4v */
566 {0x18, 0x1A, 0x1E, 0xFF}, /* sw1, 0.6 v */
567 {0x1A, 0x1E, 0xFF, 0xFF}, /* sw1, 0.8 v */
568 {0x1E, 0xFF, 0xFF, 0xFF} /* sw1, 1.2 v, optional */
569 };
570
edp_voltage_pre_emphasise_set(struct edp_ctrl * ctrl)571 static int edp_voltage_pre_emphasise_set(struct edp_ctrl *ctrl)
572 {
573 u32 value0;
574 u32 value1;
575
576 DBG("v=%d p=%d", ctrl->v_level, ctrl->p_level);
577
578 value0 = vm_pre_emphasis[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
579 value1 = vm_voltage_swing[(int)(ctrl->v_level)][(int)(ctrl->p_level)];
580
581 /* Configure host and panel only if both values are allowed */
582 if (value0 != 0xFF && value1 != 0xFF) {
583 msm_edp_phy_vm_pe_cfg(ctrl->phy, value0, value1);
584 return edp_lane_set_write(ctrl, ctrl->v_level, ctrl->p_level);
585 }
586
587 return -EINVAL;
588 }
589
edp_start_link_train_1(struct edp_ctrl * ctrl)590 static int edp_start_link_train_1(struct edp_ctrl *ctrl)
591 {
592 u8 link_status[DP_LINK_STATUS_SIZE];
593 u8 old_v_level;
594 int tries;
595 int ret;
596 int rlen;
597
598 DBG("");
599
600 edp_host_train_set(ctrl, DP_TRAINING_PATTERN_1);
601 ret = edp_voltage_pre_emphasise_set(ctrl);
602 if (ret)
603 return ret;
604 ret = edp_train_pattern_set_write(ctrl,
605 DP_TRAINING_PATTERN_1 | DP_RECOVERED_CLOCK_OUT_EN);
606 if (ret)
607 return ret;
608
609 tries = 0;
610 old_v_level = ctrl->v_level;
611 while (1) {
612 drm_dp_link_train_clock_recovery_delay(ctrl->dpcd);
613
614 rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
615 if (rlen < DP_LINK_STATUS_SIZE) {
616 pr_err("%s: read link status failed\n", __func__);
617 return -ENOLINK;
618 }
619 if (drm_dp_clock_recovery_ok(link_status, ctrl->lane_cnt)) {
620 ret = 0;
621 break;
622 }
623
624 if (ctrl->v_level == DPCD_LINK_VOLTAGE_MAX) {
625 ret = -1;
626 break;
627 }
628
629 if (old_v_level == ctrl->v_level) {
630 tries++;
631 if (tries >= 5) {
632 ret = -1;
633 break;
634 }
635 } else {
636 tries = 0;
637 old_v_level = ctrl->v_level;
638 }
639
640 edp_sink_train_set_adjust(ctrl, link_status);
641 ret = edp_voltage_pre_emphasise_set(ctrl);
642 if (ret)
643 return ret;
644 }
645
646 return ret;
647 }
648
edp_start_link_train_2(struct edp_ctrl * ctrl)649 static int edp_start_link_train_2(struct edp_ctrl *ctrl)
650 {
651 u8 link_status[DP_LINK_STATUS_SIZE];
652 int tries = 0;
653 int ret;
654 int rlen;
655
656 DBG("");
657
658 edp_host_train_set(ctrl, DP_TRAINING_PATTERN_2);
659 ret = edp_voltage_pre_emphasise_set(ctrl);
660 if (ret)
661 return ret;
662
663 ret = edp_train_pattern_set_write(ctrl,
664 DP_TRAINING_PATTERN_2 | DP_RECOVERED_CLOCK_OUT_EN);
665 if (ret)
666 return ret;
667
668 while (1) {
669 drm_dp_link_train_channel_eq_delay(ctrl->dpcd);
670
671 rlen = drm_dp_dpcd_read_link_status(ctrl->drm_aux, link_status);
672 if (rlen < DP_LINK_STATUS_SIZE) {
673 pr_err("%s: read link status failed\n", __func__);
674 return -ENOLINK;
675 }
676 if (drm_dp_channel_eq_ok(link_status, ctrl->lane_cnt)) {
677 ret = 0;
678 break;
679 }
680
681 tries++;
682 if (tries > 10) {
683 ret = -1;
684 break;
685 }
686
687 edp_sink_train_set_adjust(ctrl, link_status);
688 ret = edp_voltage_pre_emphasise_set(ctrl);
689 if (ret)
690 return ret;
691 }
692
693 return ret;
694 }
695
edp_link_rate_down_shift(struct edp_ctrl * ctrl)696 static int edp_link_rate_down_shift(struct edp_ctrl *ctrl)
697 {
698 u32 prate, lrate, bpp;
699 u8 rate, lane, max_lane;
700 int changed = 0;
701
702 rate = ctrl->link_rate;
703 lane = ctrl->lane_cnt;
704 max_lane = ctrl->dp_link.num_lanes;
705
706 bpp = ctrl->color_depth * 3;
707 prate = ctrl->pixel_rate;
708 prate *= bpp;
709 prate /= 8; /* in kByte */
710
711 if (rate > DP_LINK_BW_1_62 && rate <= EDP_LINK_BW_MAX) {
712 rate -= 4; /* reduce rate */
713 changed++;
714 }
715
716 if (changed) {
717 if (lane >= 1 && lane < max_lane)
718 lane <<= 1; /* increase lane */
719
720 lrate = 270000; /* in kHz */
721 lrate *= rate;
722 lrate /= 10; /* kByte, 10 bits --> 8 bits */
723 lrate *= lane;
724
725 DBG("new lrate=%u prate=%u(kHz) rate=%d lane=%d p=%u b=%d",
726 lrate, prate, rate, lane,
727 ctrl->pixel_rate,
728 bpp);
729
730 if (lrate > prate) {
731 ctrl->link_rate = rate;
732 ctrl->lane_cnt = lane;
733 DBG("new rate=%d %d", rate, lane);
734 return 0;
735 }
736 }
737
738 return -EINVAL;
739 }
740
edp_clear_training_pattern(struct edp_ctrl * ctrl)741 static int edp_clear_training_pattern(struct edp_ctrl *ctrl)
742 {
743 int ret;
744
745 ret = edp_train_pattern_set_write(ctrl, 0);
746
747 drm_dp_link_train_channel_eq_delay(ctrl->dpcd);
748
749 return ret;
750 }
751
edp_do_link_train(struct edp_ctrl * ctrl)752 static int edp_do_link_train(struct edp_ctrl *ctrl)
753 {
754 int ret;
755 struct drm_dp_link dp_link;
756
757 DBG("");
758 /*
759 * Set the current link rate and lane cnt to panel. They may have been
760 * adjusted and the values are different from them in DPCD CAP
761 */
762 dp_link.num_lanes = ctrl->lane_cnt;
763 dp_link.rate = drm_dp_bw_code_to_link_rate(ctrl->link_rate);
764 dp_link.capabilities = ctrl->dp_link.capabilities;
765 if (drm_dp_link_configure(ctrl->drm_aux, &dp_link) < 0)
766 return EDP_TRAIN_FAIL;
767
768 ctrl->v_level = 0; /* start from default level */
769 ctrl->p_level = 0;
770
771 edp_state_ctrl(ctrl, 0);
772 if (edp_clear_training_pattern(ctrl))
773 return EDP_TRAIN_FAIL;
774
775 ret = edp_start_link_train_1(ctrl);
776 if (ret < 0) {
777 if (edp_link_rate_down_shift(ctrl) == 0) {
778 DBG("link reconfig");
779 ret = EDP_TRAIN_RECONFIG;
780 goto clear;
781 } else {
782 pr_err("%s: Training 1 failed", __func__);
783 ret = EDP_TRAIN_FAIL;
784 goto clear;
785 }
786 }
787 DBG("Training 1 completed successfully");
788
789 edp_state_ctrl(ctrl, 0);
790 if (edp_clear_training_pattern(ctrl))
791 return EDP_TRAIN_FAIL;
792
793 ret = edp_start_link_train_2(ctrl);
794 if (ret < 0) {
795 if (edp_link_rate_down_shift(ctrl) == 0) {
796 DBG("link reconfig");
797 ret = EDP_TRAIN_RECONFIG;
798 goto clear;
799 } else {
800 pr_err("%s: Training 2 failed", __func__);
801 ret = EDP_TRAIN_FAIL;
802 goto clear;
803 }
804 }
805 DBG("Training 2 completed successfully");
806
807 edp_state_ctrl(ctrl, EDP_STATE_CTRL_SEND_VIDEO);
808 clear:
809 edp_clear_training_pattern(ctrl);
810
811 return ret;
812 }
813
edp_clock_synchrous(struct edp_ctrl * ctrl,int sync)814 static void edp_clock_synchrous(struct edp_ctrl *ctrl, int sync)
815 {
816 u32 data;
817 enum edp_color_depth depth;
818
819 data = edp_read(ctrl->base + REG_EDP_MISC1_MISC0);
820
821 if (sync)
822 data |= EDP_MISC1_MISC0_SYNC;
823 else
824 data &= ~EDP_MISC1_MISC0_SYNC;
825
826 /* only legacy rgb mode supported */
827 depth = EDP_6BIT; /* Default */
828 if (ctrl->color_depth == 8)
829 depth = EDP_8BIT;
830 else if (ctrl->color_depth == 10)
831 depth = EDP_10BIT;
832 else if (ctrl->color_depth == 12)
833 depth = EDP_12BIT;
834 else if (ctrl->color_depth == 16)
835 depth = EDP_16BIT;
836
837 data |= EDP_MISC1_MISC0_COLOR(depth);
838
839 edp_write(ctrl->base + REG_EDP_MISC1_MISC0, data);
840 }
841
edp_sw_mvid_nvid(struct edp_ctrl * ctrl,u32 m,u32 n)842 static int edp_sw_mvid_nvid(struct edp_ctrl *ctrl, u32 m, u32 n)
843 {
844 u32 n_multi, m_multi = 5;
845
846 if (ctrl->link_rate == DP_LINK_BW_1_62) {
847 n_multi = 1;
848 } else if (ctrl->link_rate == DP_LINK_BW_2_7) {
849 n_multi = 2;
850 } else {
851 pr_err("%s: Invalid link rate, %d\n", __func__,
852 ctrl->link_rate);
853 return -EINVAL;
854 }
855
856 edp_write(ctrl->base + REG_EDP_SOFTWARE_MVID, m * m_multi);
857 edp_write(ctrl->base + REG_EDP_SOFTWARE_NVID, n * n_multi);
858
859 return 0;
860 }
861
edp_mainlink_ctrl(struct edp_ctrl * ctrl,int enable)862 static void edp_mainlink_ctrl(struct edp_ctrl *ctrl, int enable)
863 {
864 u32 data = 0;
865
866 edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, EDP_MAINLINK_CTRL_RESET);
867 /* Make sure fully reset */
868 wmb();
869 usleep_range(500, 1000);
870
871 if (enable)
872 data |= EDP_MAINLINK_CTRL_ENABLE;
873
874 edp_write(ctrl->base + REG_EDP_MAINLINK_CTRL, data);
875 }
876
edp_ctrl_phy_aux_enable(struct edp_ctrl * ctrl,int enable)877 static void edp_ctrl_phy_aux_enable(struct edp_ctrl *ctrl, int enable)
878 {
879 if (enable) {
880 edp_regulator_enable(ctrl);
881 edp_clk_enable(ctrl, EDP_CLK_MASK_AUX_CHAN);
882 msm_edp_phy_ctrl(ctrl->phy, 1);
883 msm_edp_aux_ctrl(ctrl->aux, 1);
884 gpiod_set_value(ctrl->panel_en_gpio, 1);
885 } else {
886 gpiod_set_value(ctrl->panel_en_gpio, 0);
887 msm_edp_aux_ctrl(ctrl->aux, 0);
888 msm_edp_phy_ctrl(ctrl->phy, 0);
889 edp_clk_disable(ctrl, EDP_CLK_MASK_AUX_CHAN);
890 edp_regulator_disable(ctrl);
891 }
892 }
893
edp_ctrl_link_enable(struct edp_ctrl * ctrl,int enable)894 static void edp_ctrl_link_enable(struct edp_ctrl *ctrl, int enable)
895 {
896 u32 m, n;
897
898 if (enable) {
899 /* Enable link channel clocks */
900 edp_clk_enable(ctrl, EDP_CLK_MASK_LINK_CHAN);
901
902 msm_edp_phy_lane_power_ctrl(ctrl->phy, true, ctrl->lane_cnt);
903
904 msm_edp_phy_vm_pe_init(ctrl->phy);
905
906 /* Make sure phy is programed */
907 wmb();
908 msm_edp_phy_ready(ctrl->phy);
909
910 edp_config_ctrl(ctrl);
911 msm_edp_ctrl_pixel_clock_valid(ctrl, ctrl->pixel_rate, &m, &n);
912 edp_sw_mvid_nvid(ctrl, m, n);
913 edp_mainlink_ctrl(ctrl, 1);
914 } else {
915 edp_mainlink_ctrl(ctrl, 0);
916
917 msm_edp_phy_lane_power_ctrl(ctrl->phy, false, 0);
918 edp_clk_disable(ctrl, EDP_CLK_MASK_LINK_CHAN);
919 }
920 }
921
edp_ctrl_training(struct edp_ctrl * ctrl)922 static int edp_ctrl_training(struct edp_ctrl *ctrl)
923 {
924 int ret;
925
926 /* Do link training only when power is on */
927 if (!ctrl->power_on)
928 return -EINVAL;
929
930 train_start:
931 ret = edp_do_link_train(ctrl);
932 if (ret == EDP_TRAIN_RECONFIG) {
933 /* Re-configure main link */
934 edp_ctrl_irq_enable(ctrl, 0);
935 edp_ctrl_link_enable(ctrl, 0);
936 msm_edp_phy_ctrl(ctrl->phy, 0);
937
938 /* Make sure link is fully disabled */
939 wmb();
940 usleep_range(500, 1000);
941
942 msm_edp_phy_ctrl(ctrl->phy, 1);
943 edp_ctrl_link_enable(ctrl, 1);
944 edp_ctrl_irq_enable(ctrl, 1);
945 goto train_start;
946 }
947
948 return ret;
949 }
950
edp_ctrl_on_worker(struct work_struct * work)951 static void edp_ctrl_on_worker(struct work_struct *work)
952 {
953 struct edp_ctrl *ctrl = container_of(
954 work, struct edp_ctrl, on_work);
955 int ret;
956
957 mutex_lock(&ctrl->dev_mutex);
958
959 if (ctrl->power_on) {
960 DBG("already on");
961 goto unlock_ret;
962 }
963
964 edp_ctrl_phy_aux_enable(ctrl, 1);
965 edp_ctrl_link_enable(ctrl, 1);
966
967 edp_ctrl_irq_enable(ctrl, 1);
968 ret = drm_dp_link_power_up(ctrl->drm_aux, &ctrl->dp_link);
969 if (ret)
970 goto fail;
971
972 ctrl->power_on = true;
973
974 /* Start link training */
975 ret = edp_ctrl_training(ctrl);
976 if (ret != EDP_TRAIN_SUCCESS)
977 goto fail;
978
979 DBG("DONE");
980 goto unlock_ret;
981
982 fail:
983 edp_ctrl_irq_enable(ctrl, 0);
984 edp_ctrl_link_enable(ctrl, 0);
985 edp_ctrl_phy_aux_enable(ctrl, 0);
986 ctrl->power_on = false;
987 unlock_ret:
988 mutex_unlock(&ctrl->dev_mutex);
989 }
990
edp_ctrl_off_worker(struct work_struct * work)991 static void edp_ctrl_off_worker(struct work_struct *work)
992 {
993 struct edp_ctrl *ctrl = container_of(
994 work, struct edp_ctrl, off_work);
995 unsigned long time_left;
996
997 mutex_lock(&ctrl->dev_mutex);
998
999 if (!ctrl->power_on) {
1000 DBG("already off");
1001 goto unlock_ret;
1002 }
1003
1004 reinit_completion(&ctrl->idle_comp);
1005 edp_state_ctrl(ctrl, EDP_STATE_CTRL_PUSH_IDLE);
1006
1007 time_left = wait_for_completion_timeout(&ctrl->idle_comp,
1008 msecs_to_jiffies(500));
1009 if (!time_left)
1010 DBG("%s: idle pattern timedout\n", __func__);
1011
1012 edp_state_ctrl(ctrl, 0);
1013
1014 drm_dp_link_power_down(ctrl->drm_aux, &ctrl->dp_link);
1015
1016 edp_ctrl_irq_enable(ctrl, 0);
1017
1018 edp_ctrl_link_enable(ctrl, 0);
1019
1020 edp_ctrl_phy_aux_enable(ctrl, 0);
1021
1022 ctrl->power_on = false;
1023
1024 unlock_ret:
1025 mutex_unlock(&ctrl->dev_mutex);
1026 }
1027
msm_edp_ctrl_irq(struct edp_ctrl * ctrl)1028 irqreturn_t msm_edp_ctrl_irq(struct edp_ctrl *ctrl)
1029 {
1030 u32 isr1, isr2, mask1, mask2;
1031 u32 ack;
1032
1033 DBG("");
1034 spin_lock(&ctrl->irq_lock);
1035 isr1 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_1);
1036 isr2 = edp_read(ctrl->base + REG_EDP_INTERRUPT_REG_2);
1037
1038 mask1 = isr1 & EDP_INTR_MASK1;
1039 mask2 = isr2 & EDP_INTR_MASK2;
1040
1041 isr1 &= ~mask1; /* remove masks bit */
1042 isr2 &= ~mask2;
1043
1044 DBG("isr=%x mask=%x isr2=%x mask2=%x",
1045 isr1, mask1, isr2, mask2);
1046
1047 ack = isr1 & EDP_INTR_STATUS1;
1048 ack <<= 1; /* ack bits */
1049 ack |= mask1;
1050 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_1, ack);
1051
1052 ack = isr2 & EDP_INTR_STATUS2;
1053 ack <<= 1; /* ack bits */
1054 ack |= mask2;
1055 edp_write(ctrl->base + REG_EDP_INTERRUPT_REG_2, ack);
1056 spin_unlock(&ctrl->irq_lock);
1057
1058 if (isr1 & EDP_INTERRUPT_REG_1_HPD)
1059 DBG("edp_hpd");
1060
1061 if (isr2 & EDP_INTERRUPT_REG_2_READY_FOR_VIDEO)
1062 DBG("edp_video_ready");
1063
1064 if (isr2 & EDP_INTERRUPT_REG_2_IDLE_PATTERNs_SENT) {
1065 DBG("idle_patterns_sent");
1066 complete(&ctrl->idle_comp);
1067 }
1068
1069 msm_edp_aux_irq(ctrl->aux, isr1);
1070
1071 return IRQ_HANDLED;
1072 }
1073
msm_edp_ctrl_power(struct edp_ctrl * ctrl,bool on)1074 void msm_edp_ctrl_power(struct edp_ctrl *ctrl, bool on)
1075 {
1076 if (on)
1077 queue_work(ctrl->workqueue, &ctrl->on_work);
1078 else
1079 queue_work(ctrl->workqueue, &ctrl->off_work);
1080 }
1081
msm_edp_ctrl_init(struct msm_edp * edp)1082 int msm_edp_ctrl_init(struct msm_edp *edp)
1083 {
1084 struct edp_ctrl *ctrl = NULL;
1085 struct device *dev = &edp->pdev->dev;
1086 int ret;
1087
1088 if (!edp) {
1089 pr_err("%s: edp is NULL!\n", __func__);
1090 return -EINVAL;
1091 }
1092
1093 ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL);
1094 if (!ctrl)
1095 return -ENOMEM;
1096
1097 edp->ctrl = ctrl;
1098 ctrl->pdev = edp->pdev;
1099
1100 ctrl->base = msm_ioremap(ctrl->pdev, "edp", "eDP");
1101 if (IS_ERR(ctrl->base))
1102 return PTR_ERR(ctrl->base);
1103
1104 /* Get regulator, clock, gpio, pwm */
1105 ret = edp_regulator_init(ctrl);
1106 if (ret) {
1107 pr_err("%s:regulator init fail\n", __func__);
1108 return ret;
1109 }
1110 ret = edp_clk_init(ctrl);
1111 if (ret) {
1112 pr_err("%s:clk init fail\n", __func__);
1113 return ret;
1114 }
1115 ret = edp_gpio_config(ctrl);
1116 if (ret) {
1117 pr_err("%s:failed to configure GPIOs: %d", __func__, ret);
1118 return ret;
1119 }
1120
1121 /* Init aux and phy */
1122 ctrl->aux = msm_edp_aux_init(dev, ctrl->base, &ctrl->drm_aux);
1123 if (!ctrl->aux || !ctrl->drm_aux) {
1124 pr_err("%s:failed to init aux\n", __func__);
1125 return -ENOMEM;
1126 }
1127
1128 ctrl->phy = msm_edp_phy_init(dev, ctrl->base);
1129 if (!ctrl->phy) {
1130 pr_err("%s:failed to init phy\n", __func__);
1131 ret = -ENOMEM;
1132 goto err_destory_aux;
1133 }
1134
1135 spin_lock_init(&ctrl->irq_lock);
1136 mutex_init(&ctrl->dev_mutex);
1137 init_completion(&ctrl->idle_comp);
1138
1139 /* setup workqueue */
1140 ctrl->workqueue = alloc_ordered_workqueue("edp_drm_work", 0);
1141 INIT_WORK(&ctrl->on_work, edp_ctrl_on_worker);
1142 INIT_WORK(&ctrl->off_work, edp_ctrl_off_worker);
1143
1144 return 0;
1145
1146 err_destory_aux:
1147 msm_edp_aux_destroy(dev, ctrl->aux);
1148 ctrl->aux = NULL;
1149 return ret;
1150 }
1151
msm_edp_ctrl_destroy(struct edp_ctrl * ctrl)1152 void msm_edp_ctrl_destroy(struct edp_ctrl *ctrl)
1153 {
1154 if (!ctrl)
1155 return;
1156
1157 if (ctrl->workqueue) {
1158 flush_workqueue(ctrl->workqueue);
1159 destroy_workqueue(ctrl->workqueue);
1160 ctrl->workqueue = NULL;
1161 }
1162
1163 if (ctrl->aux) {
1164 msm_edp_aux_destroy(&ctrl->pdev->dev, ctrl->aux);
1165 ctrl->aux = NULL;
1166 }
1167
1168 kfree(ctrl->edid);
1169 ctrl->edid = NULL;
1170
1171 mutex_destroy(&ctrl->dev_mutex);
1172 }
1173
msm_edp_ctrl_panel_connected(struct edp_ctrl * ctrl)1174 bool msm_edp_ctrl_panel_connected(struct edp_ctrl *ctrl)
1175 {
1176 mutex_lock(&ctrl->dev_mutex);
1177 DBG("connect status = %d", ctrl->edp_connected);
1178 if (ctrl->edp_connected) {
1179 mutex_unlock(&ctrl->dev_mutex);
1180 return true;
1181 }
1182
1183 if (!ctrl->power_on) {
1184 edp_ctrl_phy_aux_enable(ctrl, 1);
1185 edp_ctrl_irq_enable(ctrl, 1);
1186 }
1187
1188 if (drm_dp_dpcd_read(ctrl->drm_aux, DP_DPCD_REV, ctrl->dpcd,
1189 DP_RECEIVER_CAP_SIZE) < DP_RECEIVER_CAP_SIZE) {
1190 pr_err("%s: AUX channel is NOT ready\n", __func__);
1191 memset(ctrl->dpcd, 0, DP_RECEIVER_CAP_SIZE);
1192 } else {
1193 ctrl->edp_connected = true;
1194 }
1195
1196 if (!ctrl->power_on) {
1197 edp_ctrl_irq_enable(ctrl, 0);
1198 edp_ctrl_phy_aux_enable(ctrl, 0);
1199 }
1200
1201 DBG("exit: connect status=%d", ctrl->edp_connected);
1202
1203 mutex_unlock(&ctrl->dev_mutex);
1204
1205 return ctrl->edp_connected;
1206 }
1207
msm_edp_ctrl_get_panel_info(struct edp_ctrl * ctrl,struct drm_connector * connector,struct edid ** edid)1208 int msm_edp_ctrl_get_panel_info(struct edp_ctrl *ctrl,
1209 struct drm_connector *connector, struct edid **edid)
1210 {
1211 int ret = 0;
1212
1213 mutex_lock(&ctrl->dev_mutex);
1214
1215 if (ctrl->edid) {
1216 if (edid) {
1217 DBG("Just return edid buffer");
1218 *edid = ctrl->edid;
1219 }
1220 goto unlock_ret;
1221 }
1222
1223 if (!ctrl->power_on) {
1224 edp_ctrl_phy_aux_enable(ctrl, 1);
1225 edp_ctrl_irq_enable(ctrl, 1);
1226 }
1227
1228 ret = drm_dp_link_probe(ctrl->drm_aux, &ctrl->dp_link);
1229 if (ret) {
1230 pr_err("%s: read dpcd cap failed, %d\n", __func__, ret);
1231 goto disable_ret;
1232 }
1233
1234 /* Initialize link rate as panel max link rate */
1235 ctrl->link_rate = drm_dp_link_rate_to_bw_code(ctrl->dp_link.rate);
1236
1237 ctrl->edid = drm_get_edid(connector, &ctrl->drm_aux->ddc);
1238 if (!ctrl->edid) {
1239 pr_err("%s: edid read fail\n", __func__);
1240 goto disable_ret;
1241 }
1242
1243 if (edid)
1244 *edid = ctrl->edid;
1245
1246 disable_ret:
1247 if (!ctrl->power_on) {
1248 edp_ctrl_irq_enable(ctrl, 0);
1249 edp_ctrl_phy_aux_enable(ctrl, 0);
1250 }
1251 unlock_ret:
1252 mutex_unlock(&ctrl->dev_mutex);
1253 return ret;
1254 }
1255
msm_edp_ctrl_timing_cfg(struct edp_ctrl * ctrl,const struct drm_display_mode * mode,const struct drm_display_info * info)1256 int msm_edp_ctrl_timing_cfg(struct edp_ctrl *ctrl,
1257 const struct drm_display_mode *mode,
1258 const struct drm_display_info *info)
1259 {
1260 u32 hstart_from_sync, vstart_from_sync;
1261 u32 data;
1262 int ret = 0;
1263
1264 mutex_lock(&ctrl->dev_mutex);
1265 /*
1266 * Need to keep color depth, pixel rate and
1267 * interlaced information in ctrl context
1268 */
1269 ctrl->color_depth = info->bpc;
1270 ctrl->pixel_rate = mode->clock;
1271 ctrl->interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
1272
1273 /* Fill initial link config based on passed in timing */
1274 edp_fill_link_cfg(ctrl);
1275
1276 if (edp_clk_enable(ctrl, EDP_CLK_MASK_AHB)) {
1277 pr_err("%s, fail to prepare enable ahb clk\n", __func__);
1278 ret = -EINVAL;
1279 goto unlock_ret;
1280 }
1281 edp_clock_synchrous(ctrl, 1);
1282
1283 /* Configure eDP timing to HW */
1284 edp_write(ctrl->base + REG_EDP_TOTAL_HOR_VER,
1285 EDP_TOTAL_HOR_VER_HORIZ(mode->htotal) |
1286 EDP_TOTAL_HOR_VER_VERT(mode->vtotal));
1287
1288 vstart_from_sync = mode->vtotal - mode->vsync_start;
1289 hstart_from_sync = mode->htotal - mode->hsync_start;
1290 edp_write(ctrl->base + REG_EDP_START_HOR_VER_FROM_SYNC,
1291 EDP_START_HOR_VER_FROM_SYNC_HORIZ(hstart_from_sync) |
1292 EDP_START_HOR_VER_FROM_SYNC_VERT(vstart_from_sync));
1293
1294 data = EDP_HSYNC_VSYNC_WIDTH_POLARITY_VERT(
1295 mode->vsync_end - mode->vsync_start);
1296 data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_HORIZ(
1297 mode->hsync_end - mode->hsync_start);
1298 if (mode->flags & DRM_MODE_FLAG_NVSYNC)
1299 data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NVSYNC;
1300 if (mode->flags & DRM_MODE_FLAG_NHSYNC)
1301 data |= EDP_HSYNC_VSYNC_WIDTH_POLARITY_NHSYNC;
1302 edp_write(ctrl->base + REG_EDP_HSYNC_VSYNC_WIDTH_POLARITY, data);
1303
1304 edp_write(ctrl->base + REG_EDP_ACTIVE_HOR_VER,
1305 EDP_ACTIVE_HOR_VER_HORIZ(mode->hdisplay) |
1306 EDP_ACTIVE_HOR_VER_VERT(mode->vdisplay));
1307
1308 edp_clk_disable(ctrl, EDP_CLK_MASK_AHB);
1309
1310 unlock_ret:
1311 mutex_unlock(&ctrl->dev_mutex);
1312 return ret;
1313 }
1314
msm_edp_ctrl_pixel_clock_valid(struct edp_ctrl * ctrl,u32 pixel_rate,u32 * pm,u32 * pn)1315 bool msm_edp_ctrl_pixel_clock_valid(struct edp_ctrl *ctrl,
1316 u32 pixel_rate, u32 *pm, u32 *pn)
1317 {
1318 const struct edp_pixel_clk_div *divs;
1319 u32 err = 1; /* 1% error tolerance */
1320 u32 clk_err;
1321 int i;
1322
1323 if (ctrl->link_rate == DP_LINK_BW_1_62) {
1324 divs = clk_divs[0];
1325 } else if (ctrl->link_rate == DP_LINK_BW_2_7) {
1326 divs = clk_divs[1];
1327 } else {
1328 pr_err("%s: Invalid link rate,%d\n", __func__, ctrl->link_rate);
1329 return false;
1330 }
1331
1332 for (i = 0; i < EDP_PIXEL_CLK_NUM; i++) {
1333 clk_err = abs(divs[i].rate - pixel_rate);
1334 if ((divs[i].rate * err / 100) >= clk_err) {
1335 if (pm)
1336 *pm = divs[i].m;
1337 if (pn)
1338 *pn = divs[i].n;
1339 return true;
1340 }
1341 }
1342
1343 DBG("pixel clock %d(kHz) not supported", pixel_rate);
1344
1345 return false;
1346 }
1347
1348