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22#include <linux/module.h>
23#include <linux/delay.h>
24#include <linux/err.h>
25#include <linux/jiffies.h>
26#include <linux/sched.h>
27#include <linux/backlight.h>
28#include <linux/fb.h>
29#include <linux/interrupt.h>
30#include <linux/gpio.h>
31#include <linux/workqueue.h>
32#include <linux/slab.h>
33#include <linux/mutex.h>
34
35#include <video/omapdss.h>
36#include <video/omap-panel-data.h>
37#include <video/mipi_display.h>
38
39
40#define TCH 0
41
42#define DCS_READ_NUM_ERRORS 0x05
43#define DCS_BRIGHTNESS 0x51
44#define DCS_CTRL_DISPLAY 0x53
45#define DCS_WRITE_CABC 0x55
46#define DCS_READ_CABC 0x56
47#define DCS_GET_ID1 0xda
48#define DCS_GET_ID2 0xdb
49#define DCS_GET_ID3 0xdc
50
51static irqreturn_t taal_te_isr(int irq, void *data);
52static void taal_te_timeout_work_callback(struct work_struct *work);
53static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable);
54
55static int taal_panel_reset(struct omap_dss_device *dssdev);
56
57struct taal_data {
58 struct mutex lock;
59
60 struct backlight_device *bldev;
61
62 unsigned long hw_guard_end;
63
64
65 unsigned long hw_guard_wait;
66
67 struct omap_dss_device *dssdev;
68
69
70 int reset_gpio;
71 int ext_te_gpio;
72
73 bool use_dsi_backlight;
74
75 struct omap_dsi_pin_config pin_config;
76
77
78 bool enabled;
79
80 bool te_enabled;
81
82 atomic_t do_update;
83 int channel;
84
85 struct delayed_work te_timeout_work;
86
87 bool cabc_broken;
88 unsigned cabc_mode;
89
90 bool intro_printed;
91
92 struct workqueue_struct *workqueue;
93
94 struct delayed_work esd_work;
95 unsigned esd_interval;
96
97 bool ulps_enabled;
98 unsigned ulps_timeout;
99 struct delayed_work ulps_work;
100};
101
102static void taal_esd_work(struct work_struct *work);
103static void taal_ulps_work(struct work_struct *work);
104
105static void hw_guard_start(struct taal_data *td, int guard_msec)
106{
107 td->hw_guard_wait = msecs_to_jiffies(guard_msec);
108 td->hw_guard_end = jiffies + td->hw_guard_wait;
109}
110
111static void hw_guard_wait(struct taal_data *td)
112{
113 unsigned long wait = td->hw_guard_end - jiffies;
114
115 if ((long)wait > 0 && wait <= td->hw_guard_wait) {
116 set_current_state(TASK_UNINTERRUPTIBLE);
117 schedule_timeout(wait);
118 }
119}
120
121static int taal_dcs_read_1(struct taal_data *td, u8 dcs_cmd, u8 *data)
122{
123 int r;
124 u8 buf[1];
125
126 r = dsi_vc_dcs_read(td->dssdev, td->channel, dcs_cmd, buf, 1);
127
128 if (r < 0)
129 return r;
130
131 *data = buf[0];
132
133 return 0;
134}
135
136static int taal_dcs_write_0(struct taal_data *td, u8 dcs_cmd)
137{
138 return dsi_vc_dcs_write(td->dssdev, td->channel, &dcs_cmd, 1);
139}
140
141static int taal_dcs_write_1(struct taal_data *td, u8 dcs_cmd, u8 param)
142{
143 u8 buf[2];
144 buf[0] = dcs_cmd;
145 buf[1] = param;
146 return dsi_vc_dcs_write(td->dssdev, td->channel, buf, 2);
147}
148
149static int taal_sleep_in(struct taal_data *td)
150
151{
152 u8 cmd;
153 int r;
154
155 hw_guard_wait(td);
156
157 cmd = MIPI_DCS_ENTER_SLEEP_MODE;
158 r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, &cmd, 1);
159 if (r)
160 return r;
161
162 hw_guard_start(td, 120);
163
164 msleep(5);
165
166 return 0;
167}
168
169static int taal_sleep_out(struct taal_data *td)
170{
171 int r;
172
173 hw_guard_wait(td);
174
175 r = taal_dcs_write_0(td, MIPI_DCS_EXIT_SLEEP_MODE);
176 if (r)
177 return r;
178
179 hw_guard_start(td, 120);
180
181 msleep(5);
182
183 return 0;
184}
185
186static int taal_get_id(struct taal_data *td, u8 *id1, u8 *id2, u8 *id3)
187{
188 int r;
189
190 r = taal_dcs_read_1(td, DCS_GET_ID1, id1);
191 if (r)
192 return r;
193 r = taal_dcs_read_1(td, DCS_GET_ID2, id2);
194 if (r)
195 return r;
196 r = taal_dcs_read_1(td, DCS_GET_ID3, id3);
197 if (r)
198 return r;
199
200 return 0;
201}
202
203static int taal_set_update_window(struct taal_data *td,
204 u16 x, u16 y, u16 w, u16 h)
205{
206 int r;
207 u16 x1 = x;
208 u16 x2 = x + w - 1;
209 u16 y1 = y;
210 u16 y2 = y + h - 1;
211
212 u8 buf[5];
213 buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
214 buf[1] = (x1 >> 8) & 0xff;
215 buf[2] = (x1 >> 0) & 0xff;
216 buf[3] = (x2 >> 8) & 0xff;
217 buf[4] = (x2 >> 0) & 0xff;
218
219 r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf));
220 if (r)
221 return r;
222
223 buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
224 buf[1] = (y1 >> 8) & 0xff;
225 buf[2] = (y1 >> 0) & 0xff;
226 buf[3] = (y2 >> 8) & 0xff;
227 buf[4] = (y2 >> 0) & 0xff;
228
229 r = dsi_vc_dcs_write_nosync(td->dssdev, td->channel, buf, sizeof(buf));
230 if (r)
231 return r;
232
233 dsi_vc_send_bta_sync(td->dssdev, td->channel);
234
235 return r;
236}
237
238static void taal_queue_esd_work(struct omap_dss_device *dssdev)
239{
240 struct taal_data *td = dev_get_drvdata(dssdev->dev);
241
242 if (td->esd_interval > 0)
243 queue_delayed_work(td->workqueue, &td->esd_work,
244 msecs_to_jiffies(td->esd_interval));
245}
246
247static void taal_cancel_esd_work(struct omap_dss_device *dssdev)
248{
249 struct taal_data *td = dev_get_drvdata(dssdev->dev);
250
251 cancel_delayed_work(&td->esd_work);
252}
253
254static void taal_queue_ulps_work(struct omap_dss_device *dssdev)
255{
256 struct taal_data *td = dev_get_drvdata(dssdev->dev);
257
258 if (td->ulps_timeout > 0)
259 queue_delayed_work(td->workqueue, &td->ulps_work,
260 msecs_to_jiffies(td->ulps_timeout));
261}
262
263static void taal_cancel_ulps_work(struct omap_dss_device *dssdev)
264{
265 struct taal_data *td = dev_get_drvdata(dssdev->dev);
266
267 cancel_delayed_work(&td->ulps_work);
268}
269
270static int taal_enter_ulps(struct omap_dss_device *dssdev)
271{
272 struct taal_data *td = dev_get_drvdata(dssdev->dev);
273 int r;
274
275 if (td->ulps_enabled)
276 return 0;
277
278 taal_cancel_ulps_work(dssdev);
279
280 r = _taal_enable_te(dssdev, false);
281 if (r)
282 goto err;
283
284 if (gpio_is_valid(td->ext_te_gpio))
285 disable_irq(gpio_to_irq(td->ext_te_gpio));
286
287 omapdss_dsi_display_disable(dssdev, false, true);
288
289 td->ulps_enabled = true;
290
291 return 0;
292
293err:
294 dev_err(dssdev->dev, "enter ULPS failed");
295 taal_panel_reset(dssdev);
296
297 td->ulps_enabled = false;
298
299 taal_queue_ulps_work(dssdev);
300
301 return r;
302}
303
304static int taal_exit_ulps(struct omap_dss_device *dssdev)
305{
306 struct taal_data *td = dev_get_drvdata(dssdev->dev);
307 int r;
308
309 if (!td->ulps_enabled)
310 return 0;
311
312 r = omapdss_dsi_display_enable(dssdev);
313 if (r) {
314 dev_err(dssdev->dev, "failed to enable DSI\n");
315 goto err1;
316 }
317
318 omapdss_dsi_vc_enable_hs(dssdev, td->channel, true);
319
320 r = _taal_enable_te(dssdev, true);
321 if (r) {
322 dev_err(dssdev->dev, "failed to re-enable TE");
323 goto err2;
324 }
325
326 if (gpio_is_valid(td->ext_te_gpio))
327 enable_irq(gpio_to_irq(td->ext_te_gpio));
328
329 taal_queue_ulps_work(dssdev);
330
331 td->ulps_enabled = false;
332
333 return 0;
334
335err2:
336 dev_err(dssdev->dev, "failed to exit ULPS");
337
338 r = taal_panel_reset(dssdev);
339 if (!r) {
340 if (gpio_is_valid(td->ext_te_gpio))
341 enable_irq(gpio_to_irq(td->ext_te_gpio));
342 td->ulps_enabled = false;
343 }
344err1:
345 taal_queue_ulps_work(dssdev);
346
347 return r;
348}
349
350static int taal_wake_up(struct omap_dss_device *dssdev)
351{
352 struct taal_data *td = dev_get_drvdata(dssdev->dev);
353
354 if (td->ulps_enabled)
355 return taal_exit_ulps(dssdev);
356
357 taal_cancel_ulps_work(dssdev);
358 taal_queue_ulps_work(dssdev);
359 return 0;
360}
361
362static int taal_bl_update_status(struct backlight_device *dev)
363{
364 struct omap_dss_device *dssdev = dev_get_drvdata(&dev->dev);
365 struct taal_data *td = dev_get_drvdata(dssdev->dev);
366 int r;
367 int level;
368
369 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
370 dev->props.power == FB_BLANK_UNBLANK)
371 level = dev->props.brightness;
372 else
373 level = 0;
374
375 dev_dbg(dssdev->dev, "update brightness to %d\n", level);
376
377 mutex_lock(&td->lock);
378
379 if (td->enabled) {
380 dsi_bus_lock(dssdev);
381
382 r = taal_wake_up(dssdev);
383 if (!r)
384 r = taal_dcs_write_1(td, DCS_BRIGHTNESS, level);
385
386 dsi_bus_unlock(dssdev);
387 } else {
388 r = 0;
389 }
390
391 mutex_unlock(&td->lock);
392
393 return r;
394}
395
396static int taal_bl_get_intensity(struct backlight_device *dev)
397{
398 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
399 dev->props.power == FB_BLANK_UNBLANK)
400 return dev->props.brightness;
401
402 return 0;
403}
404
405static const struct backlight_ops taal_bl_ops = {
406 .get_brightness = taal_bl_get_intensity,
407 .update_status = taal_bl_update_status,
408};
409
410static void taal_get_resolution(struct omap_dss_device *dssdev,
411 u16 *xres, u16 *yres)
412{
413 *xres = dssdev->panel.timings.x_res;
414 *yres = dssdev->panel.timings.y_res;
415}
416
417static ssize_t taal_num_errors_show(struct device *dev,
418 struct device_attribute *attr, char *buf)
419{
420 struct omap_dss_device *dssdev = to_dss_device(dev);
421 struct taal_data *td = dev_get_drvdata(dssdev->dev);
422 u8 errors = 0;
423 int r;
424
425 mutex_lock(&td->lock);
426
427 if (td->enabled) {
428 dsi_bus_lock(dssdev);
429
430 r = taal_wake_up(dssdev);
431 if (!r)
432 r = taal_dcs_read_1(td, DCS_READ_NUM_ERRORS, &errors);
433
434 dsi_bus_unlock(dssdev);
435 } else {
436 r = -ENODEV;
437 }
438
439 mutex_unlock(&td->lock);
440
441 if (r)
442 return r;
443
444 return snprintf(buf, PAGE_SIZE, "%d\n", errors);
445}
446
447static ssize_t taal_hw_revision_show(struct device *dev,
448 struct device_attribute *attr, char *buf)
449{
450 struct omap_dss_device *dssdev = to_dss_device(dev);
451 struct taal_data *td = dev_get_drvdata(dssdev->dev);
452 u8 id1, id2, id3;
453 int r;
454
455 mutex_lock(&td->lock);
456
457 if (td->enabled) {
458 dsi_bus_lock(dssdev);
459
460 r = taal_wake_up(dssdev);
461 if (!r)
462 r = taal_get_id(td, &id1, &id2, &id3);
463
464 dsi_bus_unlock(dssdev);
465 } else {
466 r = -ENODEV;
467 }
468
469 mutex_unlock(&td->lock);
470
471 if (r)
472 return r;
473
474 return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
475}
476
477static const char *cabc_modes[] = {
478 "off",
479 "ui",
480 "still-image",
481 "moving-image",
482};
483
484static ssize_t show_cabc_mode(struct device *dev,
485 struct device_attribute *attr,
486 char *buf)
487{
488 struct omap_dss_device *dssdev = to_dss_device(dev);
489 struct taal_data *td = dev_get_drvdata(dssdev->dev);
490 const char *mode_str;
491 int mode;
492 int len;
493
494 mode = td->cabc_mode;
495
496 mode_str = "unknown";
497 if (mode >= 0 && mode < ARRAY_SIZE(cabc_modes))
498 mode_str = cabc_modes[mode];
499 len = snprintf(buf, PAGE_SIZE, "%s\n", mode_str);
500
501 return len < PAGE_SIZE - 1 ? len : PAGE_SIZE - 1;
502}
503
504static ssize_t store_cabc_mode(struct device *dev,
505 struct device_attribute *attr,
506 const char *buf, size_t count)
507{
508 struct omap_dss_device *dssdev = to_dss_device(dev);
509 struct taal_data *td = dev_get_drvdata(dssdev->dev);
510 int i;
511 int r;
512
513 for (i = 0; i < ARRAY_SIZE(cabc_modes); i++) {
514 if (sysfs_streq(cabc_modes[i], buf))
515 break;
516 }
517
518 if (i == ARRAY_SIZE(cabc_modes))
519 return -EINVAL;
520
521 mutex_lock(&td->lock);
522
523 if (td->enabled) {
524 dsi_bus_lock(dssdev);
525
526 if (!td->cabc_broken) {
527 r = taal_wake_up(dssdev);
528 if (r)
529 goto err;
530
531 r = taal_dcs_write_1(td, DCS_WRITE_CABC, i);
532 if (r)
533 goto err;
534 }
535
536 dsi_bus_unlock(dssdev);
537 }
538
539 td->cabc_mode = i;
540
541 mutex_unlock(&td->lock);
542
543 return count;
544err:
545 dsi_bus_unlock(dssdev);
546 mutex_unlock(&td->lock);
547 return r;
548}
549
550static ssize_t show_cabc_available_modes(struct device *dev,
551 struct device_attribute *attr,
552 char *buf)
553{
554 int len;
555 int i;
556
557 for (i = 0, len = 0;
558 len < PAGE_SIZE && i < ARRAY_SIZE(cabc_modes); i++)
559 len += snprintf(&buf[len], PAGE_SIZE - len, "%s%s%s",
560 i ? " " : "", cabc_modes[i],
561 i == ARRAY_SIZE(cabc_modes) - 1 ? "\n" : "");
562
563 return len < PAGE_SIZE ? len : PAGE_SIZE - 1;
564}
565
566static ssize_t taal_store_esd_interval(struct device *dev,
567 struct device_attribute *attr,
568 const char *buf, size_t count)
569{
570 struct omap_dss_device *dssdev = to_dss_device(dev);
571 struct taal_data *td = dev_get_drvdata(dssdev->dev);
572
573 unsigned long t;
574 int r;
575
576 r = kstrtoul(buf, 10, &t);
577 if (r)
578 return r;
579
580 mutex_lock(&td->lock);
581 taal_cancel_esd_work(dssdev);
582 td->esd_interval = t;
583 if (td->enabled)
584 taal_queue_esd_work(dssdev);
585 mutex_unlock(&td->lock);
586
587 return count;
588}
589
590static ssize_t taal_show_esd_interval(struct device *dev,
591 struct device_attribute *attr,
592 char *buf)
593{
594 struct omap_dss_device *dssdev = to_dss_device(dev);
595 struct taal_data *td = dev_get_drvdata(dssdev->dev);
596 unsigned t;
597
598 mutex_lock(&td->lock);
599 t = td->esd_interval;
600 mutex_unlock(&td->lock);
601
602 return snprintf(buf, PAGE_SIZE, "%u\n", t);
603}
604
605static ssize_t taal_store_ulps(struct device *dev,
606 struct device_attribute *attr,
607 const char *buf, size_t count)
608{
609 struct omap_dss_device *dssdev = to_dss_device(dev);
610 struct taal_data *td = dev_get_drvdata(dssdev->dev);
611 unsigned long t;
612 int r;
613
614 r = kstrtoul(buf, 10, &t);
615 if (r)
616 return r;
617
618 mutex_lock(&td->lock);
619
620 if (td->enabled) {
621 dsi_bus_lock(dssdev);
622
623 if (t)
624 r = taal_enter_ulps(dssdev);
625 else
626 r = taal_wake_up(dssdev);
627
628 dsi_bus_unlock(dssdev);
629 }
630
631 mutex_unlock(&td->lock);
632
633 if (r)
634 return r;
635
636 return count;
637}
638
639static ssize_t taal_show_ulps(struct device *dev,
640 struct device_attribute *attr,
641 char *buf)
642{
643 struct omap_dss_device *dssdev = to_dss_device(dev);
644 struct taal_data *td = dev_get_drvdata(dssdev->dev);
645 unsigned t;
646
647 mutex_lock(&td->lock);
648 t = td->ulps_enabled;
649 mutex_unlock(&td->lock);
650
651 return snprintf(buf, PAGE_SIZE, "%u\n", t);
652}
653
654static ssize_t taal_store_ulps_timeout(struct device *dev,
655 struct device_attribute *attr,
656 const char *buf, size_t count)
657{
658 struct omap_dss_device *dssdev = to_dss_device(dev);
659 struct taal_data *td = dev_get_drvdata(dssdev->dev);
660 unsigned long t;
661 int r;
662
663 r = kstrtoul(buf, 10, &t);
664 if (r)
665 return r;
666
667 mutex_lock(&td->lock);
668 td->ulps_timeout = t;
669
670 if (td->enabled) {
671
672 dsi_bus_lock(dssdev);
673 r = taal_wake_up(dssdev);
674 dsi_bus_unlock(dssdev);
675 }
676
677 mutex_unlock(&td->lock);
678
679 if (r)
680 return r;
681
682 return count;
683}
684
685static ssize_t taal_show_ulps_timeout(struct device *dev,
686 struct device_attribute *attr,
687 char *buf)
688{
689 struct omap_dss_device *dssdev = to_dss_device(dev);
690 struct taal_data *td = dev_get_drvdata(dssdev->dev);
691 unsigned t;
692
693 mutex_lock(&td->lock);
694 t = td->ulps_timeout;
695 mutex_unlock(&td->lock);
696
697 return snprintf(buf, PAGE_SIZE, "%u\n", t);
698}
699
700static DEVICE_ATTR(num_dsi_errors, S_IRUGO, taal_num_errors_show, NULL);
701static DEVICE_ATTR(hw_revision, S_IRUGO, taal_hw_revision_show, NULL);
702static DEVICE_ATTR(cabc_mode, S_IRUGO | S_IWUSR,
703 show_cabc_mode, store_cabc_mode);
704static DEVICE_ATTR(cabc_available_modes, S_IRUGO,
705 show_cabc_available_modes, NULL);
706static DEVICE_ATTR(esd_interval, S_IRUGO | S_IWUSR,
707 taal_show_esd_interval, taal_store_esd_interval);
708static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
709 taal_show_ulps, taal_store_ulps);
710static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
711 taal_show_ulps_timeout, taal_store_ulps_timeout);
712
713static struct attribute *taal_attrs[] = {
714 &dev_attr_num_dsi_errors.attr,
715 &dev_attr_hw_revision.attr,
716 &dev_attr_cabc_mode.attr,
717 &dev_attr_cabc_available_modes.attr,
718 &dev_attr_esd_interval.attr,
719 &dev_attr_ulps.attr,
720 &dev_attr_ulps_timeout.attr,
721 NULL,
722};
723
724static struct attribute_group taal_attr_group = {
725 .attrs = taal_attrs,
726};
727
728static void taal_hw_reset(struct omap_dss_device *dssdev)
729{
730 struct taal_data *td = dev_get_drvdata(dssdev->dev);
731
732 if (!gpio_is_valid(td->reset_gpio))
733 return;
734
735 gpio_set_value(td->reset_gpio, 1);
736 udelay(10);
737
738 gpio_set_value(td->reset_gpio, 0);
739
740 udelay(10);
741 gpio_set_value(td->reset_gpio, 1);
742
743 msleep(5);
744}
745
746static void taal_probe_pdata(struct taal_data *td,
747 const struct nokia_dsi_panel_data *pdata)
748{
749 td->reset_gpio = pdata->reset_gpio;
750
751 if (pdata->use_ext_te)
752 td->ext_te_gpio = pdata->ext_te_gpio;
753 else
754 td->ext_te_gpio = -1;
755
756 td->esd_interval = pdata->esd_interval;
757 td->ulps_timeout = pdata->ulps_timeout;
758
759 td->use_dsi_backlight = pdata->use_dsi_backlight;
760
761 td->pin_config = pdata->pin_config;
762}
763
764static int taal_probe(struct omap_dss_device *dssdev)
765{
766 struct backlight_properties props;
767 struct taal_data *td;
768 struct backlight_device *bldev = NULL;
769 int r;
770
771 dev_dbg(dssdev->dev, "probe\n");
772
773 td = devm_kzalloc(dssdev->dev, sizeof(*td), GFP_KERNEL);
774 if (!td)
775 return -ENOMEM;
776
777 dev_set_drvdata(dssdev->dev, td);
778 td->dssdev = dssdev;
779
780 if (dssdev->data) {
781 const struct nokia_dsi_panel_data *pdata = dssdev->data;
782
783 taal_probe_pdata(td, pdata);
784 } else {
785 return -ENODEV;
786 }
787
788 dssdev->panel.timings.x_res = 864;
789 dssdev->panel.timings.y_res = 480;
790 dssdev->panel.timings.pixel_clock = DIV_ROUND_UP(864 * 480 * 60, 1000);
791 dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
792 dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
793 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
794
795 mutex_init(&td->lock);
796
797 atomic_set(&td->do_update, 0);
798
799 if (gpio_is_valid(td->reset_gpio)) {
800 r = devm_gpio_request_one(dssdev->dev, td->reset_gpio,
801 GPIOF_OUT_INIT_LOW, "taal rst");
802 if (r) {
803 dev_err(dssdev->dev, "failed to request reset gpio\n");
804 return r;
805 }
806 }
807
808 if (gpio_is_valid(td->ext_te_gpio)) {
809 r = devm_gpio_request_one(dssdev->dev, td->ext_te_gpio,
810 GPIOF_IN, "taal irq");
811 if (r) {
812 dev_err(dssdev->dev, "GPIO request failed\n");
813 return r;
814 }
815
816 r = devm_request_irq(dssdev->dev, gpio_to_irq(td->ext_te_gpio),
817 taal_te_isr,
818 IRQF_TRIGGER_RISING,
819 "taal vsync", dssdev);
820
821 if (r) {
822 dev_err(dssdev->dev, "IRQ request failed\n");
823 return r;
824 }
825
826 INIT_DEFERRABLE_WORK(&td->te_timeout_work,
827 taal_te_timeout_work_callback);
828
829 dev_dbg(dssdev->dev, "Using GPIO TE\n");
830 }
831
832 td->workqueue = create_singlethread_workqueue("taal_esd");
833 if (td->workqueue == NULL) {
834 dev_err(dssdev->dev, "can't create ESD workqueue\n");
835 return -ENOMEM;
836 }
837 INIT_DEFERRABLE_WORK(&td->esd_work, taal_esd_work);
838 INIT_DELAYED_WORK(&td->ulps_work, taal_ulps_work);
839
840 taal_hw_reset(dssdev);
841
842 if (td->use_dsi_backlight) {
843 memset(&props, 0, sizeof(struct backlight_properties));
844 props.max_brightness = 255;
845
846 props.type = BACKLIGHT_RAW;
847 bldev = backlight_device_register(dev_name(dssdev->dev),
848 dssdev->dev, dssdev, &taal_bl_ops, &props);
849 if (IS_ERR(bldev)) {
850 r = PTR_ERR(bldev);
851 goto err_bl;
852 }
853
854 td->bldev = bldev;
855
856 bldev->props.fb_blank = FB_BLANK_UNBLANK;
857 bldev->props.power = FB_BLANK_UNBLANK;
858 bldev->props.brightness = 255;
859
860 taal_bl_update_status(bldev);
861 }
862
863 r = omap_dsi_request_vc(dssdev, &td->channel);
864 if (r) {
865 dev_err(dssdev->dev, "failed to get virtual channel\n");
866 goto err_req_vc;
867 }
868
869 r = omap_dsi_set_vc_id(dssdev, td->channel, TCH);
870 if (r) {
871 dev_err(dssdev->dev, "failed to set VC_ID\n");
872 goto err_vc_id;
873 }
874
875 r = sysfs_create_group(&dssdev->dev->kobj, &taal_attr_group);
876 if (r) {
877 dev_err(dssdev->dev, "failed to create sysfs files\n");
878 goto err_vc_id;
879 }
880
881 return 0;
882
883err_vc_id:
884 omap_dsi_release_vc(dssdev, td->channel);
885err_req_vc:
886 if (bldev != NULL)
887 backlight_device_unregister(bldev);
888err_bl:
889 destroy_workqueue(td->workqueue);
890 return r;
891}
892
893static void __exit taal_remove(struct omap_dss_device *dssdev)
894{
895 struct taal_data *td = dev_get_drvdata(dssdev->dev);
896 struct backlight_device *bldev;
897
898 dev_dbg(dssdev->dev, "remove\n");
899
900 sysfs_remove_group(&dssdev->dev->kobj, &taal_attr_group);
901 omap_dsi_release_vc(dssdev, td->channel);
902
903 bldev = td->bldev;
904 if (bldev != NULL) {
905 bldev->props.power = FB_BLANK_POWERDOWN;
906 taal_bl_update_status(bldev);
907 backlight_device_unregister(bldev);
908 }
909
910 taal_cancel_ulps_work(dssdev);
911 taal_cancel_esd_work(dssdev);
912 destroy_workqueue(td->workqueue);
913
914
915 taal_hw_reset(dssdev);
916}
917
918static int taal_power_on(struct omap_dss_device *dssdev)
919{
920 struct taal_data *td = dev_get_drvdata(dssdev->dev);
921 u8 id1, id2, id3;
922 int r;
923 struct omap_dss_dsi_config dsi_config = {
924 .mode = OMAP_DSS_DSI_CMD_MODE,
925 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
926 .timings = &dssdev->panel.timings,
927 .hs_clk_min = 150000000,
928 .hs_clk_max = 300000000,
929 .lp_clk_min = 7000000,
930 .lp_clk_max = 10000000,
931 };
932
933 r = omapdss_dsi_configure_pins(dssdev, &td->pin_config);
934 if (r) {
935 dev_err(dssdev->dev, "failed to configure DSI pins\n");
936 goto err0;
937 };
938
939 r = omapdss_dsi_set_config(dssdev, &dsi_config);
940 if (r) {
941 dev_err(dssdev->dev, "failed to configure DSI\n");
942 goto err0;
943 }
944
945 r = omapdss_dsi_display_enable(dssdev);
946 if (r) {
947 dev_err(dssdev->dev, "failed to enable DSI\n");
948 goto err0;
949 }
950
951 taal_hw_reset(dssdev);
952
953 omapdss_dsi_vc_enable_hs(dssdev, td->channel, false);
954
955 r = taal_sleep_out(td);
956 if (r)
957 goto err;
958
959 r = taal_get_id(td, &id1, &id2, &id3);
960 if (r)
961 goto err;
962
963
964 if (id2 == 0x00 || id2 == 0xff || id2 == 0x81)
965 td->cabc_broken = true;
966
967 r = taal_dcs_write_1(td, DCS_BRIGHTNESS, 0xff);
968 if (r)
969 goto err;
970
971 r = taal_dcs_write_1(td, DCS_CTRL_DISPLAY,
972 (1<<2) | (1<<5));
973 if (r)
974 goto err;
975
976 r = taal_dcs_write_1(td, MIPI_DCS_SET_PIXEL_FORMAT,
977 MIPI_DCS_PIXEL_FMT_24BIT);
978 if (r)
979 goto err;
980
981 if (!td->cabc_broken) {
982 r = taal_dcs_write_1(td, DCS_WRITE_CABC, td->cabc_mode);
983 if (r)
984 goto err;
985 }
986
987 r = taal_dcs_write_0(td, MIPI_DCS_SET_DISPLAY_ON);
988 if (r)
989 goto err;
990
991 r = _taal_enable_te(dssdev, td->te_enabled);
992 if (r)
993 goto err;
994
995 r = dsi_enable_video_output(dssdev, td->channel);
996 if (r)
997 goto err;
998
999 td->enabled = 1;
1000
1001 if (!td->intro_printed) {
1002 dev_info(dssdev->dev, "panel revision %02x.%02x.%02x\n",
1003 id1, id2, id3);
1004 if (td->cabc_broken)
1005 dev_info(dssdev->dev,
1006 "old Taal version, CABC disabled\n");
1007 td->intro_printed = true;
1008 }
1009
1010 omapdss_dsi_vc_enable_hs(dssdev, td->channel, true);
1011
1012 return 0;
1013err:
1014 dev_err(dssdev->dev, "error while enabling panel, issuing HW reset\n");
1015
1016 taal_hw_reset(dssdev);
1017
1018 omapdss_dsi_display_disable(dssdev, true, false);
1019err0:
1020 return r;
1021}
1022
1023static void taal_power_off(struct omap_dss_device *dssdev)
1024{
1025 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1026 int r;
1027
1028 dsi_disable_video_output(dssdev, td->channel);
1029
1030 r = taal_dcs_write_0(td, MIPI_DCS_SET_DISPLAY_OFF);
1031 if (!r)
1032 r = taal_sleep_in(td);
1033
1034 if (r) {
1035 dev_err(dssdev->dev,
1036 "error disabling panel, issuing HW reset\n");
1037 taal_hw_reset(dssdev);
1038 }
1039
1040 omapdss_dsi_display_disable(dssdev, true, false);
1041
1042 td->enabled = 0;
1043}
1044
1045static int taal_panel_reset(struct omap_dss_device *dssdev)
1046{
1047 dev_err(dssdev->dev, "performing LCD reset\n");
1048
1049 taal_power_off(dssdev);
1050 taal_hw_reset(dssdev);
1051 return taal_power_on(dssdev);
1052}
1053
1054static int taal_enable(struct omap_dss_device *dssdev)
1055{
1056 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1057 int r;
1058
1059 dev_dbg(dssdev->dev, "enable\n");
1060
1061 mutex_lock(&td->lock);
1062
1063 if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
1064 r = -EINVAL;
1065 goto err;
1066 }
1067
1068 dsi_bus_lock(dssdev);
1069
1070 r = taal_power_on(dssdev);
1071
1072 dsi_bus_unlock(dssdev);
1073
1074 if (r)
1075 goto err;
1076
1077 taal_queue_esd_work(dssdev);
1078
1079 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
1080
1081 mutex_unlock(&td->lock);
1082
1083 return 0;
1084err:
1085 dev_dbg(dssdev->dev, "enable failed\n");
1086 mutex_unlock(&td->lock);
1087 return r;
1088}
1089
1090static void taal_disable(struct omap_dss_device *dssdev)
1091{
1092 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1093
1094 dev_dbg(dssdev->dev, "disable\n");
1095
1096 mutex_lock(&td->lock);
1097
1098 taal_cancel_ulps_work(dssdev);
1099 taal_cancel_esd_work(dssdev);
1100
1101 dsi_bus_lock(dssdev);
1102
1103 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
1104 int r;
1105
1106 r = taal_wake_up(dssdev);
1107 if (!r)
1108 taal_power_off(dssdev);
1109 }
1110
1111 dsi_bus_unlock(dssdev);
1112
1113 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
1114
1115 mutex_unlock(&td->lock);
1116}
1117
1118static void taal_framedone_cb(int err, void *data)
1119{
1120 struct omap_dss_device *dssdev = data;
1121 dev_dbg(dssdev->dev, "framedone, err %d\n", err);
1122 dsi_bus_unlock(dssdev);
1123}
1124
1125static irqreturn_t taal_te_isr(int irq, void *data)
1126{
1127 struct omap_dss_device *dssdev = data;
1128 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1129 int old;
1130 int r;
1131
1132 old = atomic_cmpxchg(&td->do_update, 1, 0);
1133
1134 if (old) {
1135 cancel_delayed_work(&td->te_timeout_work);
1136
1137 r = omap_dsi_update(dssdev, td->channel, taal_framedone_cb,
1138 dssdev);
1139 if (r)
1140 goto err;
1141 }
1142
1143 return IRQ_HANDLED;
1144err:
1145 dev_err(dssdev->dev, "start update failed\n");
1146 dsi_bus_unlock(dssdev);
1147 return IRQ_HANDLED;
1148}
1149
1150static void taal_te_timeout_work_callback(struct work_struct *work)
1151{
1152 struct taal_data *td = container_of(work, struct taal_data,
1153 te_timeout_work.work);
1154 struct omap_dss_device *dssdev = td->dssdev;
1155
1156 dev_err(dssdev->dev, "TE not received for 250ms!\n");
1157
1158 atomic_set(&td->do_update, 0);
1159 dsi_bus_unlock(dssdev);
1160}
1161
1162static int taal_update(struct omap_dss_device *dssdev,
1163 u16 x, u16 y, u16 w, u16 h)
1164{
1165 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1166 int r;
1167
1168 dev_dbg(dssdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
1169
1170 mutex_lock(&td->lock);
1171 dsi_bus_lock(dssdev);
1172
1173 r = taal_wake_up(dssdev);
1174 if (r)
1175 goto err;
1176
1177 if (!td->enabled) {
1178 r = 0;
1179 goto err;
1180 }
1181
1182
1183 r = taal_set_update_window(td, 0, 0,
1184 dssdev->panel.timings.x_res,
1185 dssdev->panel.timings.y_res);
1186 if (r)
1187 goto err;
1188
1189 if (td->te_enabled && gpio_is_valid(td->ext_te_gpio)) {
1190 schedule_delayed_work(&td->te_timeout_work,
1191 msecs_to_jiffies(250));
1192 atomic_set(&td->do_update, 1);
1193 } else {
1194 r = omap_dsi_update(dssdev, td->channel, taal_framedone_cb,
1195 dssdev);
1196 if (r)
1197 goto err;
1198 }
1199
1200
1201 mutex_unlock(&td->lock);
1202 return 0;
1203err:
1204 dsi_bus_unlock(dssdev);
1205 mutex_unlock(&td->lock);
1206 return r;
1207}
1208
1209static int taal_sync(struct omap_dss_device *dssdev)
1210{
1211 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1212
1213 dev_dbg(dssdev->dev, "sync\n");
1214
1215 mutex_lock(&td->lock);
1216 dsi_bus_lock(dssdev);
1217 dsi_bus_unlock(dssdev);
1218 mutex_unlock(&td->lock);
1219
1220 dev_dbg(dssdev->dev, "sync done\n");
1221
1222 return 0;
1223}
1224
1225static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable)
1226{
1227 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1228 int r;
1229
1230 if (enable)
1231 r = taal_dcs_write_1(td, MIPI_DCS_SET_TEAR_ON, 0);
1232 else
1233 r = taal_dcs_write_0(td, MIPI_DCS_SET_TEAR_OFF);
1234
1235 if (!gpio_is_valid(td->ext_te_gpio))
1236 omapdss_dsi_enable_te(dssdev, enable);
1237
1238
1239 msleep(100);
1240
1241 return r;
1242}
1243
1244static int taal_enable_te(struct omap_dss_device *dssdev, bool enable)
1245{
1246 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1247 int r;
1248
1249 mutex_lock(&td->lock);
1250
1251 if (td->te_enabled == enable)
1252 goto end;
1253
1254 dsi_bus_lock(dssdev);
1255
1256 if (td->enabled) {
1257 r = taal_wake_up(dssdev);
1258 if (r)
1259 goto err;
1260
1261 r = _taal_enable_te(dssdev, enable);
1262 if (r)
1263 goto err;
1264 }
1265
1266 td->te_enabled = enable;
1267
1268 dsi_bus_unlock(dssdev);
1269end:
1270 mutex_unlock(&td->lock);
1271
1272 return 0;
1273err:
1274 dsi_bus_unlock(dssdev);
1275 mutex_unlock(&td->lock);
1276
1277 return r;
1278}
1279
1280static int taal_get_te(struct omap_dss_device *dssdev)
1281{
1282 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1283 int r;
1284
1285 mutex_lock(&td->lock);
1286 r = td->te_enabled;
1287 mutex_unlock(&td->lock);
1288
1289 return r;
1290}
1291
1292static int taal_run_test(struct omap_dss_device *dssdev, int test_num)
1293{
1294 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1295 u8 id1, id2, id3;
1296 int r;
1297
1298 mutex_lock(&td->lock);
1299
1300 if (!td->enabled) {
1301 r = -ENODEV;
1302 goto err1;
1303 }
1304
1305 dsi_bus_lock(dssdev);
1306
1307 r = taal_wake_up(dssdev);
1308 if (r)
1309 goto err2;
1310
1311 r = taal_dcs_read_1(td, DCS_GET_ID1, &id1);
1312 if (r)
1313 goto err2;
1314 r = taal_dcs_read_1(td, DCS_GET_ID2, &id2);
1315 if (r)
1316 goto err2;
1317 r = taal_dcs_read_1(td, DCS_GET_ID3, &id3);
1318 if (r)
1319 goto err2;
1320
1321 dsi_bus_unlock(dssdev);
1322 mutex_unlock(&td->lock);
1323 return 0;
1324err2:
1325 dsi_bus_unlock(dssdev);
1326err1:
1327 mutex_unlock(&td->lock);
1328 return r;
1329}
1330
1331static int taal_memory_read(struct omap_dss_device *dssdev,
1332 void *buf, size_t size,
1333 u16 x, u16 y, u16 w, u16 h)
1334{
1335 int r;
1336 int first = 1;
1337 int plen;
1338 unsigned buf_used = 0;
1339 struct taal_data *td = dev_get_drvdata(dssdev->dev);
1340
1341 if (size < w * h * 3)
1342 return -ENOMEM;
1343
1344 mutex_lock(&td->lock);
1345
1346 if (!td->enabled) {
1347 r = -ENODEV;
1348 goto err1;
1349 }
1350
1351 size = min(w * h * 3,
1352 dssdev->panel.timings.x_res *
1353 dssdev->panel.timings.y_res * 3);
1354
1355 dsi_bus_lock(dssdev);
1356
1357 r = taal_wake_up(dssdev);
1358 if (r)
1359 goto err2;
1360
1361
1362
1363
1364 if (size % 2)
1365 plen = 1;
1366 else
1367 plen = 2;
1368
1369 taal_set_update_window(td, x, y, w, h);
1370
1371 r = dsi_vc_set_max_rx_packet_size(dssdev, td->channel, plen);
1372 if (r)
1373 goto err2;
1374
1375 while (buf_used < size) {
1376 u8 dcs_cmd = first ? 0x2e : 0x3e;
1377 first = 0;
1378
1379 r = dsi_vc_dcs_read(dssdev, td->channel, dcs_cmd,
1380 buf + buf_used, size - buf_used);
1381
1382 if (r < 0) {
1383 dev_err(dssdev->dev, "read error\n");
1384 goto err3;
1385 }
1386
1387 buf_used += r;
1388
1389 if (r < plen) {
1390 dev_err(dssdev->dev, "short read\n");
1391 break;
1392 }
1393
1394 if (signal_pending(current)) {
1395 dev_err(dssdev->dev, "signal pending, "
1396 "aborting memory read\n");
1397 r = -ERESTARTSYS;
1398 goto err3;
1399 }
1400 }
1401
1402 r = buf_used;
1403
1404err3:
1405 dsi_vc_set_max_rx_packet_size(dssdev, td->channel, 1);
1406err2:
1407 dsi_bus_unlock(dssdev);
1408err1:
1409 mutex_unlock(&td->lock);
1410 return r;
1411}
1412
1413static void taal_ulps_work(struct work_struct *work)
1414{
1415 struct taal_data *td = container_of(work, struct taal_data,
1416 ulps_work.work);
1417 struct omap_dss_device *dssdev = td->dssdev;
1418
1419 mutex_lock(&td->lock);
1420
1421 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !td->enabled) {
1422 mutex_unlock(&td->lock);
1423 return;
1424 }
1425
1426 dsi_bus_lock(dssdev);
1427
1428 taal_enter_ulps(dssdev);
1429
1430 dsi_bus_unlock(dssdev);
1431 mutex_unlock(&td->lock);
1432}
1433
1434static void taal_esd_work(struct work_struct *work)
1435{
1436 struct taal_data *td = container_of(work, struct taal_data,
1437 esd_work.work);
1438 struct omap_dss_device *dssdev = td->dssdev;
1439 u8 state1, state2;
1440 int r;
1441
1442 mutex_lock(&td->lock);
1443
1444 if (!td->enabled) {
1445 mutex_unlock(&td->lock);
1446 return;
1447 }
1448
1449 dsi_bus_lock(dssdev);
1450
1451 r = taal_wake_up(dssdev);
1452 if (r) {
1453 dev_err(dssdev->dev, "failed to exit ULPS\n");
1454 goto err;
1455 }
1456
1457 r = taal_dcs_read_1(td, MIPI_DCS_GET_DIAGNOSTIC_RESULT, &state1);
1458 if (r) {
1459 dev_err(dssdev->dev, "failed to read Taal status\n");
1460 goto err;
1461 }
1462
1463
1464 r = taal_sleep_out(td);
1465 if (r) {
1466 dev_err(dssdev->dev, "failed to run Taal self-diagnostics\n");
1467 goto err;
1468 }
1469
1470 r = taal_dcs_read_1(td, MIPI_DCS_GET_DIAGNOSTIC_RESULT, &state2);
1471 if (r) {
1472 dev_err(dssdev->dev, "failed to read Taal status\n");
1473 goto err;
1474 }
1475
1476
1477
1478
1479 if (!((state1 ^ state2) & (1 << 6))) {
1480 dev_err(dssdev->dev, "LCD self diagnostics failed\n");
1481 goto err;
1482 }
1483
1484
1485 if (td->te_enabled && gpio_is_valid(td->ext_te_gpio)) {
1486 r = taal_dcs_write_1(td, MIPI_DCS_SET_TEAR_ON, 0);
1487 if (r)
1488 goto err;
1489 }
1490
1491 dsi_bus_unlock(dssdev);
1492
1493 taal_queue_esd_work(dssdev);
1494
1495 mutex_unlock(&td->lock);
1496 return;
1497err:
1498 dev_err(dssdev->dev, "performing LCD reset\n");
1499
1500 taal_panel_reset(dssdev);
1501
1502 dsi_bus_unlock(dssdev);
1503
1504 taal_queue_esd_work(dssdev);
1505
1506 mutex_unlock(&td->lock);
1507}
1508
1509static struct omap_dss_driver taal_driver = {
1510 .probe = taal_probe,
1511 .remove = __exit_p(taal_remove),
1512
1513 .enable = taal_enable,
1514 .disable = taal_disable,
1515
1516 .update = taal_update,
1517 .sync = taal_sync,
1518
1519 .get_resolution = taal_get_resolution,
1520 .get_recommended_bpp = omapdss_default_get_recommended_bpp,
1521
1522 .enable_te = taal_enable_te,
1523 .get_te = taal_get_te,
1524
1525 .run_test = taal_run_test,
1526 .memory_read = taal_memory_read,
1527
1528 .driver = {
1529 .name = "taal",
1530 .owner = THIS_MODULE,
1531 },
1532};
1533
1534static int __init taal_init(void)
1535{
1536 omap_dss_register_driver(&taal_driver);
1537
1538 return 0;
1539}
1540
1541static void __exit taal_exit(void)
1542{
1543 omap_dss_unregister_driver(&taal_driver);
1544}
1545
1546module_init(taal_init);
1547module_exit(taal_exit);
1548
1549MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@nokia.com>");
1550MODULE_DESCRIPTION("Taal Driver");
1551MODULE_LICENSE("GPL");
1552
