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1/*
2 * Generic DSI Command Mode panel driver
3 *
4 * Copyright (C) 2013 Texas Instruments Incorporated - http://www.ti.com/
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11
12/* #define DEBUG */
13
14#include <linux/backlight.h>
15#include <linux/delay.h>
16#include <linux/gpio/consumer.h>
17#include <linux/interrupt.h>
18#include <linux/jiffies.h>
19#include <linux/module.h>
20#include <linux/platform_device.h>
21#include <linux/sched/signal.h>
22#include <linux/slab.h>
23#include <linux/workqueue.h>
24#include <linux/of_device.h>
25#include <linux/regulator/consumer.h>
26
27#include <video/mipi_display.h>
28#include <video/of_display_timing.h>
29
30#include "../dss/omapdss.h"
31
32/* DSI Virtual channel. Hardcoded for now. */
33#define TCH 0
34
35#define DCS_READ_NUM_ERRORS 0x05
36#define DCS_BRIGHTNESS 0x51
37#define DCS_CTRL_DISPLAY 0x53
38#define DCS_GET_ID1 0xda
39#define DCS_GET_ID2 0xdb
40#define DCS_GET_ID3 0xdc
41
42struct panel_drv_data {
43 struct omap_dss_device dssdev;
44 struct omap_dss_device *in;
45
46 struct videomode vm;
47
48 struct platform_device *pdev;
49
50 struct mutex lock;
51
52 struct backlight_device *bldev;
53 struct backlight_device *extbldev;
54
55 unsigned long hw_guard_end; /* next value of jiffies when we can
56 * issue the next sleep in/out command
57 */
58 unsigned long hw_guard_wait; /* max guard time in jiffies */
59
60 /* panel HW configuration from DT or platform data */
61 struct gpio_desc *reset_gpio;
62 struct gpio_desc *ext_te_gpio;
63
64 struct regulator *vpnl;
65 struct regulator *vddi;
66
67 bool use_dsi_backlight;
68
69 int width_mm;
70 int height_mm;
71
72 struct omap_dsi_pin_config pin_config;
73
74 /* runtime variables */
75 bool enabled;
76
77 bool te_enabled;
78
79 atomic_t do_update;
80 int channel;
81
82 struct delayed_work te_timeout_work;
83
84 bool intro_printed;
85
86 struct workqueue_struct *workqueue;
87
88 bool ulps_enabled;
89 unsigned int ulps_timeout;
90 struct delayed_work ulps_work;
91};
92
93#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
94
95static irqreturn_t dsicm_te_isr(int irq, void *data);
96static void dsicm_te_timeout_work_callback(struct work_struct *work);
97static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
98
99static int dsicm_panel_reset(struct panel_drv_data *ddata);
100
101static void dsicm_ulps_work(struct work_struct *work);
102
103static void dsicm_bl_power(struct panel_drv_data *ddata, bool enable)
104{
105 struct backlight_device *backlight;
106
107 if (ddata->bldev)
108 backlight = ddata->bldev;
109 else if (ddata->extbldev)
110 backlight = ddata->extbldev;
111 else
112 return;
113
114 if (enable) {
115 backlight->props.fb_blank = FB_BLANK_UNBLANK;
116 backlight->props.state = ~(BL_CORE_FBBLANK | BL_CORE_SUSPENDED);
117 backlight->props.power = FB_BLANK_UNBLANK;
118 } else {
119 backlight->props.fb_blank = FB_BLANK_NORMAL;
120 backlight->props.power = FB_BLANK_POWERDOWN;
121 backlight->props.state |= BL_CORE_FBBLANK | BL_CORE_SUSPENDED;
122 }
123
124 backlight_update_status(backlight);
125}
126
127static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
128{
129 ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
130 ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
131}
132
133static void hw_guard_wait(struct panel_drv_data *ddata)
134{
135 unsigned long wait = ddata->hw_guard_end - jiffies;
136
137 if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
138 set_current_state(TASK_UNINTERRUPTIBLE);
139 schedule_timeout(wait);
140 }
141}
142
143static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
144{
145 struct omap_dss_device *in = ddata->in;
146 int r;
147 u8 buf[1];
148
149 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1);
150
151 if (r < 0)
152 return r;
153
154 *data = buf[0];
155
156 return 0;
157}
158
159static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
160{
161 struct omap_dss_device *in = ddata->in;
162 return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1);
163}
164
165static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
166{
167 struct omap_dss_device *in = ddata->in;
168 u8 buf[2] = { dcs_cmd, param };
169
170 return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
171}
172
173static int dsicm_sleep_in(struct panel_drv_data *ddata)
174
175{
176 struct omap_dss_device *in = ddata->in;
177 u8 cmd;
178 int r;
179
180 hw_guard_wait(ddata);
181
182 cmd = MIPI_DCS_ENTER_SLEEP_MODE;
183 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1);
184 if (r)
185 return r;
186
187 hw_guard_start(ddata, 120);
188
189 usleep_range(5000, 10000);
190
191 return 0;
192}
193
194static int dsicm_sleep_out(struct panel_drv_data *ddata)
195{
196 int r;
197
198 hw_guard_wait(ddata);
199
200 r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
201 if (r)
202 return r;
203
204 hw_guard_start(ddata, 120);
205
206 usleep_range(5000, 10000);
207
208 return 0;
209}
210
211static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
212{
213 int r;
214
215 r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
216 if (r)
217 return r;
218 r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
219 if (r)
220 return r;
221 r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
222 if (r)
223 return r;
224
225 return 0;
226}
227
228static int dsicm_set_update_window(struct panel_drv_data *ddata,
229 u16 x, u16 y, u16 w, u16 h)
230{
231 struct omap_dss_device *in = ddata->in;
232 int r;
233 u16 x1 = x;
234 u16 x2 = x + w - 1;
235 u16 y1 = y;
236 u16 y2 = y + h - 1;
237
238 u8 buf[5];
239 buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
240 buf[1] = (x1 >> 8) & 0xff;
241 buf[2] = (x1 >> 0) & 0xff;
242 buf[3] = (x2 >> 8) & 0xff;
243 buf[4] = (x2 >> 0) & 0xff;
244
245 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
246 if (r)
247 return r;
248
249 buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
250 buf[1] = (y1 >> 8) & 0xff;
251 buf[2] = (y1 >> 0) & 0xff;
252 buf[3] = (y2 >> 8) & 0xff;
253 buf[4] = (y2 >> 0) & 0xff;
254
255 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
256 if (r)
257 return r;
258
259 in->ops.dsi->bta_sync(in, ddata->channel);
260
261 return r;
262}
263
264static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
265{
266 if (ddata->ulps_timeout > 0)
267 queue_delayed_work(ddata->workqueue, &ddata->ulps_work,
268 msecs_to_jiffies(ddata->ulps_timeout));
269}
270
271static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
272{
273 cancel_delayed_work(&ddata->ulps_work);
274}
275
276static int dsicm_enter_ulps(struct panel_drv_data *ddata)
277{
278 struct omap_dss_device *in = ddata->in;
279 int r;
280
281 if (ddata->ulps_enabled)
282 return 0;
283
284 dsicm_cancel_ulps_work(ddata);
285
286 r = _dsicm_enable_te(ddata, false);
287 if (r)
288 goto err;
289
290 if (ddata->ext_te_gpio)
291 disable_irq(gpiod_to_irq(ddata->ext_te_gpio));
292
293 in->ops.dsi->disable(in, false, true);
294
295 ddata->ulps_enabled = true;
296
297 return 0;
298
299err:
300 dev_err(&ddata->pdev->dev, "enter ULPS failed");
301 dsicm_panel_reset(ddata);
302
303 ddata->ulps_enabled = false;
304
305 dsicm_queue_ulps_work(ddata);
306
307 return r;
308}
309
310static int dsicm_exit_ulps(struct panel_drv_data *ddata)
311{
312 struct omap_dss_device *in = ddata->in;
313 int r;
314
315 if (!ddata->ulps_enabled)
316 return 0;
317
318 r = in->ops.dsi->enable(in);
319 if (r) {
320 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
321 goto err1;
322 }
323
324 in->ops.dsi->enable_hs(in, ddata->channel, true);
325
326 r = _dsicm_enable_te(ddata, true);
327 if (r) {
328 dev_err(&ddata->pdev->dev, "failed to re-enable TE");
329 goto err2;
330 }
331
332 if (ddata->ext_te_gpio)
333 enable_irq(gpiod_to_irq(ddata->ext_te_gpio));
334
335 dsicm_queue_ulps_work(ddata);
336
337 ddata->ulps_enabled = false;
338
339 return 0;
340
341err2:
342 dev_err(&ddata->pdev->dev, "failed to exit ULPS");
343
344 r = dsicm_panel_reset(ddata);
345 if (!r) {
346 if (ddata->ext_te_gpio)
347 enable_irq(gpiod_to_irq(ddata->ext_te_gpio));
348 ddata->ulps_enabled = false;
349 }
350err1:
351 dsicm_queue_ulps_work(ddata);
352
353 return r;
354}
355
356static int dsicm_wake_up(struct panel_drv_data *ddata)
357{
358 if (ddata->ulps_enabled)
359 return dsicm_exit_ulps(ddata);
360
361 dsicm_cancel_ulps_work(ddata);
362 dsicm_queue_ulps_work(ddata);
363 return 0;
364}
365
366static int dsicm_bl_update_status(struct backlight_device *dev)
367{
368 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
369 struct omap_dss_device *in = ddata->in;
370 int r = 0;
371 int level;
372
373 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
374 dev->props.power == FB_BLANK_UNBLANK)
375 level = dev->props.brightness;
376 else
377 level = 0;
378
379 dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
380
381 mutex_lock(&ddata->lock);
382
383 if (ddata->enabled) {
384 in->ops.dsi->bus_lock(in);
385
386 r = dsicm_wake_up(ddata);
387 if (!r)
388 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
389
390 in->ops.dsi->bus_unlock(in);
391 }
392
393 mutex_unlock(&ddata->lock);
394
395 return r;
396}
397
398static int dsicm_bl_get_intensity(struct backlight_device *dev)
399{
400 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
401 dev->props.power == FB_BLANK_UNBLANK)
402 return dev->props.brightness;
403
404 return 0;
405}
406
407static const struct backlight_ops dsicm_bl_ops = {
408 .get_brightness = dsicm_bl_get_intensity,
409 .update_status = dsicm_bl_update_status,
410};
411
412static ssize_t dsicm_num_errors_show(struct device *dev,
413 struct device_attribute *attr, char *buf)
414{
415 struct platform_device *pdev = to_platform_device(dev);
416 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
417 struct omap_dss_device *in = ddata->in;
418 u8 errors = 0;
419 int r;
420
421 mutex_lock(&ddata->lock);
422
423 if (ddata->enabled) {
424 in->ops.dsi->bus_lock(in);
425
426 r = dsicm_wake_up(ddata);
427 if (!r)
428 r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
429 &errors);
430
431 in->ops.dsi->bus_unlock(in);
432 } else {
433 r = -ENODEV;
434 }
435
436 mutex_unlock(&ddata->lock);
437
438 if (r)
439 return r;
440
441 return snprintf(buf, PAGE_SIZE, "%d\n", errors);
442}
443
444static ssize_t dsicm_hw_revision_show(struct device *dev,
445 struct device_attribute *attr, char *buf)
446{
447 struct platform_device *pdev = to_platform_device(dev);
448 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
449 struct omap_dss_device *in = ddata->in;
450 u8 id1, id2, id3;
451 int r;
452
453 mutex_lock(&ddata->lock);
454
455 if (ddata->enabled) {
456 in->ops.dsi->bus_lock(in);
457
458 r = dsicm_wake_up(ddata);
459 if (!r)
460 r = dsicm_get_id(ddata, &id1, &id2, &id3);
461
462 in->ops.dsi->bus_unlock(in);
463 } else {
464 r = -ENODEV;
465 }
466
467 mutex_unlock(&ddata->lock);
468
469 if (r)
470 return r;
471
472 return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
473}
474
475static ssize_t dsicm_store_ulps(struct device *dev,
476 struct device_attribute *attr,
477 const char *buf, size_t count)
478{
479 struct platform_device *pdev = to_platform_device(dev);
480 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
481 struct omap_dss_device *in = ddata->in;
482 unsigned long t;
483 int r;
484
485 r = kstrtoul(buf, 0, &t);
486 if (r)
487 return r;
488
489 mutex_lock(&ddata->lock);
490
491 if (ddata->enabled) {
492 in->ops.dsi->bus_lock(in);
493
494 if (t)
495 r = dsicm_enter_ulps(ddata);
496 else
497 r = dsicm_wake_up(ddata);
498
499 in->ops.dsi->bus_unlock(in);
500 }
501
502 mutex_unlock(&ddata->lock);
503
504 if (r)
505 return r;
506
507 return count;
508}
509
510static ssize_t dsicm_show_ulps(struct device *dev,
511 struct device_attribute *attr,
512 char *buf)
513{
514 struct platform_device *pdev = to_platform_device(dev);
515 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
516 unsigned int t;
517
518 mutex_lock(&ddata->lock);
519 t = ddata->ulps_enabled;
520 mutex_unlock(&ddata->lock);
521
522 return snprintf(buf, PAGE_SIZE, "%u\n", t);
523}
524
525static ssize_t dsicm_store_ulps_timeout(struct device *dev,
526 struct device_attribute *attr,
527 const char *buf, size_t count)
528{
529 struct platform_device *pdev = to_platform_device(dev);
530 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
531 struct omap_dss_device *in = ddata->in;
532 unsigned long t;
533 int r;
534
535 r = kstrtoul(buf, 0, &t);
536 if (r)
537 return r;
538
539 mutex_lock(&ddata->lock);
540 ddata->ulps_timeout = t;
541
542 if (ddata->enabled) {
543 /* dsicm_wake_up will restart the timer */
544 in->ops.dsi->bus_lock(in);
545 r = dsicm_wake_up(ddata);
546 in->ops.dsi->bus_unlock(in);
547 }
548
549 mutex_unlock(&ddata->lock);
550
551 if (r)
552 return r;
553
554 return count;
555}
556
557static ssize_t dsicm_show_ulps_timeout(struct device *dev,
558 struct device_attribute *attr,
559 char *buf)
560{
561 struct platform_device *pdev = to_platform_device(dev);
562 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
563 unsigned int t;
564
565 mutex_lock(&ddata->lock);
566 t = ddata->ulps_timeout;
567 mutex_unlock(&ddata->lock);
568
569 return snprintf(buf, PAGE_SIZE, "%u\n", t);
570}
571
572static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
573static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
574static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
575 dsicm_show_ulps, dsicm_store_ulps);
576static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
577 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
578
579static struct attribute *dsicm_attrs[] = {
580 &dev_attr_num_dsi_errors.attr,
581 &dev_attr_hw_revision.attr,
582 &dev_attr_ulps.attr,
583 &dev_attr_ulps_timeout.attr,
584 NULL,
585};
586
587static const struct attribute_group dsicm_attr_group = {
588 .attrs = dsicm_attrs,
589};
590
591static void dsicm_hw_reset(struct panel_drv_data *ddata)
592{
593 gpiod_set_value(ddata->reset_gpio, 1);
594 udelay(10);
595 /* reset the panel */
596 gpiod_set_value(ddata->reset_gpio, 0);
597 /* assert reset */
598 udelay(10);
599 gpiod_set_value(ddata->reset_gpio, 1);
600 /* wait after releasing reset */
601 usleep_range(5000, 10000);
602}
603
604static int dsicm_power_on(struct panel_drv_data *ddata)
605{
606 struct omap_dss_device *in = ddata->in;
607 u8 id1, id2, id3;
608 int r;
609 struct omap_dss_dsi_config dsi_config = {
610 .mode = OMAP_DSS_DSI_CMD_MODE,
611 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
612 .vm = &ddata->vm,
613 .hs_clk_min = 150000000,
614 .hs_clk_max = 300000000,
615 .lp_clk_min = 7000000,
616 .lp_clk_max = 10000000,
617 };
618
619 if (ddata->vpnl) {
620 r = regulator_enable(ddata->vpnl);
621 if (r) {
622 dev_err(&ddata->pdev->dev,
623 "failed to enable VPNL: %d\n", r);
624 return r;
625 }
626 }
627
628 if (ddata->vddi) {
629 r = regulator_enable(ddata->vddi);
630 if (r) {
631 dev_err(&ddata->pdev->dev,
632 "failed to enable VDDI: %d\n", r);
633 goto err_vpnl;
634 }
635 }
636
637 if (ddata->pin_config.num_pins > 0) {
638 r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
639 if (r) {
640 dev_err(&ddata->pdev->dev,
641 "failed to configure DSI pins\n");
642 goto err_vddi;
643 }
644 }
645
646 r = in->ops.dsi->set_config(in, &dsi_config);
647 if (r) {
648 dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
649 goto err_vddi;
650 }
651
652 r = in->ops.dsi->enable(in);
653 if (r) {
654 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
655 goto err_vddi;
656 }
657
658 dsicm_hw_reset(ddata);
659
660 in->ops.dsi->enable_hs(in, ddata->channel, false);
661
662 r = dsicm_sleep_out(ddata);
663 if (r)
664 goto err;
665
666 r = dsicm_get_id(ddata, &id1, &id2, &id3);
667 if (r)
668 goto err;
669
670 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
671 if (r)
672 goto err;
673
674 r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
675 (1<<2) | (1<<5)); /* BL | BCTRL */
676 if (r)
677 goto err;
678
679 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
680 MIPI_DCS_PIXEL_FMT_24BIT);
681 if (r)
682 goto err;
683
684 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
685 if (r)
686 goto err;
687
688 r = _dsicm_enable_te(ddata, ddata->te_enabled);
689 if (r)
690 goto err;
691
692 r = in->ops.dsi->enable_video_output(in, ddata->channel);
693 if (r)
694 goto err;
695
696 ddata->enabled = 1;
697
698 if (!ddata->intro_printed) {
699 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
700 id1, id2, id3);
701 ddata->intro_printed = true;
702 }
703
704 in->ops.dsi->enable_hs(in, ddata->channel, true);
705
706 return 0;
707err:
708 dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
709
710 dsicm_hw_reset(ddata);
711
712 in->ops.dsi->disable(in, true, false);
713err_vddi:
714 if (ddata->vddi)
715 regulator_disable(ddata->vddi);
716err_vpnl:
717 if (ddata->vpnl)
718 regulator_disable(ddata->vpnl);
719
720 return r;
721}
722
723static void dsicm_power_off(struct panel_drv_data *ddata)
724{
725 struct omap_dss_device *in = ddata->in;
726 int r;
727
728 in->ops.dsi->disable_video_output(in, ddata->channel);
729
730 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
731 if (!r)
732 r = dsicm_sleep_in(ddata);
733
734 if (r) {
735 dev_err(&ddata->pdev->dev,
736 "error disabling panel, issuing HW reset\n");
737 dsicm_hw_reset(ddata);
738 }
739
740 in->ops.dsi->disable(in, true, false);
741
742 if (ddata->vddi)
743 regulator_disable(ddata->vddi);
744 if (ddata->vpnl)
745 regulator_disable(ddata->vpnl);
746
747 ddata->enabled = 0;
748}
749
750static int dsicm_panel_reset(struct panel_drv_data *ddata)
751{
752 dev_err(&ddata->pdev->dev, "performing LCD reset\n");
753
754 dsicm_power_off(ddata);
755 dsicm_hw_reset(ddata);
756 return dsicm_power_on(ddata);
757}
758
759static int dsicm_connect(struct omap_dss_device *dssdev)
760{
761 struct panel_drv_data *ddata = to_panel_data(dssdev);
762 struct device *dev = &ddata->pdev->dev;
763 struct omap_dss_device *in;
764 int r;
765
766 if (omapdss_device_is_connected(dssdev))
767 return 0;
768
769 in = omapdss_of_find_source_for_first_ep(dssdev->dev->of_node);
770 if (IS_ERR(in)) {
771 dev_err(dssdev->dev, "failed to find video source\n");
772 return PTR_ERR(in);
773 }
774
775 r = in->ops.dsi->connect(in, dssdev);
776 if (r) {
777 dev_err(dev, "Failed to connect to video source\n");
778 goto err_connect;
779 }
780
781 r = in->ops.dsi->request_vc(in, &ddata->channel);
782 if (r) {
783 dev_err(dev, "failed to get virtual channel\n");
784 goto err_req_vc;
785 }
786
787 r = in->ops.dsi->set_vc_id(in, ddata->channel, TCH);
788 if (r) {
789 dev_err(dev, "failed to set VC_ID\n");
790 goto err_vc_id;
791 }
792
793 ddata->in = in;
794 return 0;
795
796err_vc_id:
797 in->ops.dsi->release_vc(in, ddata->channel);
798err_req_vc:
799 in->ops.dsi->disconnect(in, dssdev);
800err_connect:
801 omap_dss_put_device(in);
802 return r;
803}
804
805static void dsicm_disconnect(struct omap_dss_device *dssdev)
806{
807 struct panel_drv_data *ddata = to_panel_data(dssdev);
808 struct omap_dss_device *in = ddata->in;
809
810 if (!omapdss_device_is_connected(dssdev))
811 return;
812
813 in->ops.dsi->release_vc(in, ddata->channel);
814 in->ops.dsi->disconnect(in, dssdev);
815
816 omap_dss_put_device(in);
817 ddata->in = NULL;
818}
819
820static int dsicm_enable(struct omap_dss_device *dssdev)
821{
822 struct panel_drv_data *ddata = to_panel_data(dssdev);
823 struct omap_dss_device *in = ddata->in;
824 int r;
825
826 dev_dbg(&ddata->pdev->dev, "enable\n");
827
828 mutex_lock(&ddata->lock);
829
830 if (!omapdss_device_is_connected(dssdev)) {
831 r = -ENODEV;
832 goto err;
833 }
834
835 if (omapdss_device_is_enabled(dssdev)) {
836 r = 0;
837 goto err;
838 }
839
840 in->ops.dsi->bus_lock(in);
841
842 r = dsicm_power_on(ddata);
843
844 in->ops.dsi->bus_unlock(in);
845
846 if (r)
847 goto err;
848
849 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
850
851 mutex_unlock(&ddata->lock);
852
853 dsicm_bl_power(ddata, true);
854
855 return 0;
856err:
857 dev_dbg(&ddata->pdev->dev, "enable failed\n");
858 mutex_unlock(&ddata->lock);
859 return r;
860}
861
862static void dsicm_disable(struct omap_dss_device *dssdev)
863{
864 struct panel_drv_data *ddata = to_panel_data(dssdev);
865 struct omap_dss_device *in = ddata->in;
866 int r;
867
868 dev_dbg(&ddata->pdev->dev, "disable\n");
869
870 dsicm_bl_power(ddata, false);
871
872 mutex_lock(&ddata->lock);
873
874 dsicm_cancel_ulps_work(ddata);
875
876 in->ops.dsi->bus_lock(in);
877
878 if (omapdss_device_is_enabled(dssdev)) {
879 r = dsicm_wake_up(ddata);
880 if (!r)
881 dsicm_power_off(ddata);
882 }
883
884 in->ops.dsi->bus_unlock(in);
885
886 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
887
888 mutex_unlock(&ddata->lock);
889}
890
891static void dsicm_framedone_cb(int err, void *data)
892{
893 struct panel_drv_data *ddata = data;
894 struct omap_dss_device *in = ddata->in;
895
896 dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
897 in->ops.dsi->bus_unlock(ddata->in);
898}
899
900static irqreturn_t dsicm_te_isr(int irq, void *data)
901{
902 struct panel_drv_data *ddata = data;
903 struct omap_dss_device *in = ddata->in;
904 int old;
905 int r;
906
907 old = atomic_cmpxchg(&ddata->do_update, 1, 0);
908
909 if (old) {
910 cancel_delayed_work(&ddata->te_timeout_work);
911
912 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
913 ddata);
914 if (r)
915 goto err;
916 }
917
918 return IRQ_HANDLED;
919err:
920 dev_err(&ddata->pdev->dev, "start update failed\n");
921 in->ops.dsi->bus_unlock(in);
922 return IRQ_HANDLED;
923}
924
925static void dsicm_te_timeout_work_callback(struct work_struct *work)
926{
927 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
928 te_timeout_work.work);
929 struct omap_dss_device *in = ddata->in;
930
931 dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
932
933 atomic_set(&ddata->do_update, 0);
934 in->ops.dsi->bus_unlock(in);
935}
936
937static int dsicm_update(struct omap_dss_device *dssdev,
938 u16 x, u16 y, u16 w, u16 h)
939{
940 struct panel_drv_data *ddata = to_panel_data(dssdev);
941 struct omap_dss_device *in = ddata->in;
942 int r;
943
944 dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
945
946 mutex_lock(&ddata->lock);
947 in->ops.dsi->bus_lock(in);
948
949 r = dsicm_wake_up(ddata);
950 if (r)
951 goto err;
952
953 if (!ddata->enabled) {
954 r = 0;
955 goto err;
956 }
957
958 /* XXX no need to send this every frame, but dsi break if not done */
959 r = dsicm_set_update_window(ddata, 0, 0,
960 dssdev->panel.vm.hactive,
961 dssdev->panel.vm.vactive);
962 if (r)
963 goto err;
964
965 if (ddata->te_enabled && ddata->ext_te_gpio) {
966 schedule_delayed_work(&ddata->te_timeout_work,
967 msecs_to_jiffies(250));
968 atomic_set(&ddata->do_update, 1);
969 } else {
970 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
971 ddata);
972 if (r)
973 goto err;
974 }
975
976 /* note: no bus_unlock here. unlock is in framedone_cb */
977 mutex_unlock(&ddata->lock);
978 return 0;
979err:
980 in->ops.dsi->bus_unlock(in);
981 mutex_unlock(&ddata->lock);
982 return r;
983}
984
985static int dsicm_sync(struct omap_dss_device *dssdev)
986{
987 struct panel_drv_data *ddata = to_panel_data(dssdev);
988 struct omap_dss_device *in = ddata->in;
989
990 dev_dbg(&ddata->pdev->dev, "sync\n");
991
992 mutex_lock(&ddata->lock);
993 in->ops.dsi->bus_lock(in);
994 in->ops.dsi->bus_unlock(in);
995 mutex_unlock(&ddata->lock);
996
997 dev_dbg(&ddata->pdev->dev, "sync done\n");
998
999 return 0;
1000}
1001
1002static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
1003{
1004 struct omap_dss_device *in = ddata->in;
1005 int r;
1006
1007 if (enable)
1008 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
1009 else
1010 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
1011
1012 if (!ddata->ext_te_gpio)
1013 in->ops.dsi->enable_te(in, enable);
1014
1015 /* possible panel bug */
1016 msleep(100);
1017
1018 return r;
1019}
1020
1021static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
1022{
1023 struct panel_drv_data *ddata = to_panel_data(dssdev);
1024 struct omap_dss_device *in = ddata->in;
1025 int r;
1026
1027 mutex_lock(&ddata->lock);
1028
1029 if (ddata->te_enabled == enable)
1030 goto end;
1031
1032 in->ops.dsi->bus_lock(in);
1033
1034 if (ddata->enabled) {
1035 r = dsicm_wake_up(ddata);
1036 if (r)
1037 goto err;
1038
1039 r = _dsicm_enable_te(ddata, enable);
1040 if (r)
1041 goto err;
1042 }
1043
1044 ddata->te_enabled = enable;
1045
1046 in->ops.dsi->bus_unlock(in);
1047end:
1048 mutex_unlock(&ddata->lock);
1049
1050 return 0;
1051err:
1052 in->ops.dsi->bus_unlock(in);
1053 mutex_unlock(&ddata->lock);
1054
1055 return r;
1056}
1057
1058static int dsicm_get_te(struct omap_dss_device *dssdev)
1059{
1060 struct panel_drv_data *ddata = to_panel_data(dssdev);
1061 int r;
1062
1063 mutex_lock(&ddata->lock);
1064 r = ddata->te_enabled;
1065 mutex_unlock(&ddata->lock);
1066
1067 return r;
1068}
1069
1070static int dsicm_memory_read(struct omap_dss_device *dssdev,
1071 void *buf, size_t size,
1072 u16 x, u16 y, u16 w, u16 h)
1073{
1074 struct panel_drv_data *ddata = to_panel_data(dssdev);
1075 struct omap_dss_device *in = ddata->in;
1076 int r;
1077 int first = 1;
1078 int plen;
1079 unsigned int buf_used = 0;
1080
1081 if (size < w * h * 3)
1082 return -ENOMEM;
1083
1084 mutex_lock(&ddata->lock);
1085
1086 if (!ddata->enabled) {
1087 r = -ENODEV;
1088 goto err1;
1089 }
1090
1091 size = min((u32)w * h * 3,
1092 dssdev->panel.vm.hactive * dssdev->panel.vm.vactive * 3);
1093
1094 in->ops.dsi->bus_lock(in);
1095
1096 r = dsicm_wake_up(ddata);
1097 if (r)
1098 goto err2;
1099
1100 /* plen 1 or 2 goes into short packet. until checksum error is fixed,
1101 * use short packets. plen 32 works, but bigger packets seem to cause
1102 * an error. */
1103 if (size % 2)
1104 plen = 1;
1105 else
1106 plen = 2;
1107
1108 dsicm_set_update_window(ddata, x, y, w, h);
1109
1110 r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
1111 if (r)
1112 goto err2;
1113
1114 while (buf_used < size) {
1115 u8 dcs_cmd = first ? 0x2e : 0x3e;
1116 first = 0;
1117
1118 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd,
1119 buf + buf_used, size - buf_used);
1120
1121 if (r < 0) {
1122 dev_err(dssdev->dev, "read error\n");
1123 goto err3;
1124 }
1125
1126 buf_used += r;
1127
1128 if (r < plen) {
1129 dev_err(&ddata->pdev->dev, "short read\n");
1130 break;
1131 }
1132
1133 if (signal_pending(current)) {
1134 dev_err(&ddata->pdev->dev, "signal pending, "
1135 "aborting memory read\n");
1136 r = -ERESTARTSYS;
1137 goto err3;
1138 }
1139 }
1140
1141 r = buf_used;
1142
1143err3:
1144 in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
1145err2:
1146 in->ops.dsi->bus_unlock(in);
1147err1:
1148 mutex_unlock(&ddata->lock);
1149 return r;
1150}
1151
1152static void dsicm_ulps_work(struct work_struct *work)
1153{
1154 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
1155 ulps_work.work);
1156 struct omap_dss_device *dssdev = &ddata->dssdev;
1157 struct omap_dss_device *in = ddata->in;
1158
1159 mutex_lock(&ddata->lock);
1160
1161 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
1162 mutex_unlock(&ddata->lock);
1163 return;
1164 }
1165
1166 in->ops.dsi->bus_lock(in);
1167
1168 dsicm_enter_ulps(ddata);
1169
1170 in->ops.dsi->bus_unlock(in);
1171 mutex_unlock(&ddata->lock);
1172}
1173
1174static void dsicm_get_timings(struct omap_dss_device *dssdev,
1175 struct videomode *vm)
1176{
1177 struct panel_drv_data *ddata = to_panel_data(dssdev);
1178
1179 *vm = ddata->vm;
1180}
1181
1182static int dsicm_check_timings(struct omap_dss_device *dssdev,
1183 struct videomode *vm)
1184{
1185 struct panel_drv_data *ddata = to_panel_data(dssdev);
1186 int ret = 0;
1187
1188 if (vm->hactive != ddata->vm.hactive)
1189 ret = -EINVAL;
1190
1191 if (vm->vactive != ddata->vm.vactive)
1192 ret = -EINVAL;
1193
1194 if (ret) {
1195 dev_warn(dssdev->dev, "wrong resolution: %d x %d",
1196 vm->hactive, vm->vactive);
1197 dev_warn(dssdev->dev, "panel resolution: %d x %d",
1198 ddata->vm.hactive, ddata->vm.vactive);
1199 }
1200
1201 return ret;
1202}
1203
1204static void dsicm_get_size(struct omap_dss_device *dssdev,
1205 unsigned int *width, unsigned int *height)
1206{
1207 struct panel_drv_data *ddata = to_panel_data(dssdev);
1208
1209 *width = ddata->width_mm;
1210 *height = ddata->height_mm;
1211}
1212
1213static struct omap_dss_driver dsicm_ops = {
1214 .connect = dsicm_connect,
1215 .disconnect = dsicm_disconnect,
1216
1217 .enable = dsicm_enable,
1218 .disable = dsicm_disable,
1219
1220 .update = dsicm_update,
1221 .sync = dsicm_sync,
1222
1223 .get_timings = dsicm_get_timings,
1224 .check_timings = dsicm_check_timings,
1225 .get_size = dsicm_get_size,
1226
1227 .enable_te = dsicm_enable_te,
1228 .get_te = dsicm_get_te,
1229
1230 .memory_read = dsicm_memory_read,
1231};
1232
1233static int dsicm_probe_of(struct platform_device *pdev)
1234{
1235 struct device_node *node = pdev->dev.of_node;
1236 struct device_node *backlight;
1237 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1238 struct display_timing timing;
1239 int err;
1240
1241 ddata->reset_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW);
1242 if (IS_ERR(ddata->reset_gpio)) {
1243 err = PTR_ERR(ddata->reset_gpio);
1244 dev_err(&pdev->dev, "reset gpio request failed: %d", err);
1245 return err;
1246 }
1247
1248 ddata->ext_te_gpio = devm_gpiod_get_optional(&pdev->dev, "te",
1249 GPIOD_IN);
1250 if (IS_ERR(ddata->ext_te_gpio)) {
1251 err = PTR_ERR(ddata->ext_te_gpio);
1252 dev_err(&pdev->dev, "TE gpio request failed: %d", err);
1253 return err;
1254 }
1255
1256 err = of_get_display_timing(node, "panel-timing", &timing);
1257 if (!err) {
1258 videomode_from_timing(&timing, &ddata->vm);
1259 if (!ddata->vm.pixelclock)
1260 ddata->vm.pixelclock =
1261 ddata->vm.hactive * ddata->vm.vactive * 60;
1262 } else {
1263 dev_warn(&pdev->dev,
1264 "failed to get video timing, using defaults\n");
1265 }
1266
1267 ddata->width_mm = 0;
1268 of_property_read_u32(node, "width-mm", &ddata->width_mm);
1269
1270 ddata->height_mm = 0;
1271 of_property_read_u32(node, "height-mm", &ddata->height_mm);
1272
1273 ddata->vpnl = devm_regulator_get_optional(&pdev->dev, "vpnl");
1274 if (IS_ERR(ddata->vpnl)) {
1275 err = PTR_ERR(ddata->vpnl);
1276 if (err == -EPROBE_DEFER)
1277 return err;
1278 ddata->vpnl = NULL;
1279 }
1280
1281 ddata->vddi = devm_regulator_get_optional(&pdev->dev, "vddi");
1282 if (IS_ERR(ddata->vddi)) {
1283 err = PTR_ERR(ddata->vddi);
1284 if (err == -EPROBE_DEFER)
1285 return err;
1286 ddata->vddi = NULL;
1287 }
1288
1289 backlight = of_parse_phandle(node, "backlight", 0);
1290 if (backlight) {
1291 ddata->extbldev = of_find_backlight_by_node(backlight);
1292 of_node_put(backlight);
1293
1294 if (!ddata->extbldev)
1295 return -EPROBE_DEFER;
1296 } else {
1297 /* assume native backlight support */
1298 ddata->use_dsi_backlight = true;
1299 }
1300
1301 /* TODO: ulps */
1302
1303 return 0;
1304}
1305
1306static int dsicm_probe(struct platform_device *pdev)
1307{
1308 struct panel_drv_data *ddata;
1309 struct backlight_device *bldev = NULL;
1310 struct device *dev = &pdev->dev;
1311 struct omap_dss_device *dssdev;
1312 int r;
1313
1314 dev_dbg(dev, "probe\n");
1315
1316 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
1317 if (!ddata)
1318 return -ENOMEM;
1319
1320 platform_set_drvdata(pdev, ddata);
1321 ddata->pdev = pdev;
1322
1323 ddata->vm.hactive = 864;
1324 ddata->vm.vactive = 480;
1325 ddata->vm.pixelclock = 864 * 480 * 60;
1326
1327 r = dsicm_probe_of(pdev);
1328 if (r)
1329 return r;
1330
1331 dssdev = &ddata->dssdev;
1332 dssdev->dev = dev;
1333 dssdev->driver = &dsicm_ops;
1334 dssdev->panel.vm = ddata->vm;
1335 dssdev->type = OMAP_DISPLAY_TYPE_DSI;
1336 dssdev->owner = THIS_MODULE;
1337
1338 dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
1339 dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
1340 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
1341
1342 r = omapdss_register_display(dssdev);
1343 if (r) {
1344 dev_err(dev, "Failed to register panel\n");
1345 goto err_reg;
1346 }
1347
1348 mutex_init(&ddata->lock);
1349
1350 atomic_set(&ddata->do_update, 0);
1351
1352 if (ddata->ext_te_gpio) {
1353 r = devm_request_irq(dev, gpiod_to_irq(ddata->ext_te_gpio),
1354 dsicm_te_isr,
1355 IRQF_TRIGGER_RISING,
1356 "taal vsync", ddata);
1357
1358 if (r) {
1359 dev_err(dev, "IRQ request failed\n");
1360 goto err_reg;
1361 }
1362
1363 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
1364 dsicm_te_timeout_work_callback);
1365
1366 dev_dbg(dev, "Using GPIO TE\n");
1367 }
1368
1369 ddata->workqueue = create_singlethread_workqueue("dsicm_wq");
1370 if (!ddata->workqueue) {
1371 r = -ENOMEM;
1372 goto err_reg;
1373 }
1374 INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
1375
1376 dsicm_hw_reset(ddata);
1377
1378 if (ddata->use_dsi_backlight) {
1379 struct backlight_properties props = { 0 };
1380 props.max_brightness = 255;
1381 props.type = BACKLIGHT_RAW;
1382
1383 bldev = devm_backlight_device_register(dev, dev_name(dev),
1384 dev, ddata, &dsicm_bl_ops, &props);
1385 if (IS_ERR(bldev)) {
1386 r = PTR_ERR(bldev);
1387 goto err_bl;
1388 }
1389
1390 ddata->bldev = bldev;
1391 }
1392
1393 r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
1394 if (r) {
1395 dev_err(dev, "failed to create sysfs files\n");
1396 goto err_bl;
1397 }
1398
1399 return 0;
1400
1401err_bl:
1402 destroy_workqueue(ddata->workqueue);
1403err_reg:
1404 if (ddata->extbldev)
1405 put_device(&ddata->extbldev->dev);
1406
1407 return r;
1408}
1409
1410static int __exit dsicm_remove(struct platform_device *pdev)
1411{
1412 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1413 struct omap_dss_device *dssdev = &ddata->dssdev;
1414
1415 dev_dbg(&pdev->dev, "remove\n");
1416
1417 omapdss_unregister_display(dssdev);
1418
1419 dsicm_disable(dssdev);
1420 dsicm_disconnect(dssdev);
1421
1422 sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
1423
1424 if (ddata->extbldev)
1425 put_device(&ddata->extbldev->dev);
1426
1427 dsicm_cancel_ulps_work(ddata);
1428 destroy_workqueue(ddata->workqueue);
1429
1430 /* reset, to be sure that the panel is in a valid state */
1431 dsicm_hw_reset(ddata);
1432
1433 return 0;
1434}
1435
1436static const struct of_device_id dsicm_of_match[] = {
1437 { .compatible = "omapdss,panel-dsi-cm", },
1438 {},
1439};
1440
1441MODULE_DEVICE_TABLE(of, dsicm_of_match);
1442
1443static struct platform_driver dsicm_driver = {
1444 .probe = dsicm_probe,
1445 .remove = __exit_p(dsicm_remove),
1446 .driver = {
1447 .name = "panel-dsi-cm",
1448 .of_match_table = dsicm_of_match,
1449 .suppress_bind_attrs = true,
1450 },
1451};
1452
1453module_platform_driver(dsicm_driver);
1454
1455MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
1456MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
1457MODULE_LICENSE("GPL");