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11#include <linux/backlight.h>
12#include <linux/delay.h>
13#include <linux/fb.h>
14#include <linux/gpio.h>
15#include <linux/interrupt.h>
16#include <linux/jiffies.h>
17#include <linux/module.h>
18#include <linux/platform_device.h>
19#include <linux/sched/signal.h>
20#include <linux/slab.h>
21#include <linux/workqueue.h>
22#include <linux/of_device.h>
23#include <linux/of_gpio.h>
24
25#include <video/omapfb_dss.h>
26#include <video/mipi_display.h>
27
28
29#define TCH 0
30
31#define DCS_READ_NUM_ERRORS 0x05
32#define DCS_BRIGHTNESS 0x51
33#define DCS_CTRL_DISPLAY 0x53
34#define DCS_GET_ID1 0xda
35#define DCS_GET_ID2 0xdb
36#define DCS_GET_ID3 0xdc
37
38struct panel_drv_data {
39 struct omap_dss_device dssdev;
40 struct omap_dss_device *in;
41
42 struct omap_video_timings timings;
43
44 struct platform_device *pdev;
45
46 struct mutex lock;
47
48 struct backlight_device *bldev;
49
50 unsigned long hw_guard_end;
51
52
53 unsigned long hw_guard_wait;
54
55
56 int reset_gpio;
57 int ext_te_gpio;
58
59 bool use_dsi_backlight;
60
61 struct omap_dsi_pin_config pin_config;
62
63
64 bool enabled;
65
66 bool te_enabled;
67
68 atomic_t do_update;
69 int channel;
70
71 struct delayed_work te_timeout_work;
72
73 bool intro_printed;
74
75 bool ulps_enabled;
76 unsigned ulps_timeout;
77 struct delayed_work ulps_work;
78};
79
80#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
81
82static irqreturn_t dsicm_te_isr(int irq, void *data);
83static void dsicm_te_timeout_work_callback(struct work_struct *work);
84static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
85
86static int dsicm_panel_reset(struct panel_drv_data *ddata);
87
88static void dsicm_ulps_work(struct work_struct *work);
89
90static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
91{
92 ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
93 ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
94}
95
96static void hw_guard_wait(struct panel_drv_data *ddata)
97{
98 unsigned long wait = ddata->hw_guard_end - jiffies;
99
100 if ((long)wait > 0 && time_before_eq(wait, ddata->hw_guard_wait)) {
101 set_current_state(TASK_UNINTERRUPTIBLE);
102 schedule_timeout(wait);
103 }
104}
105
106static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
107{
108 struct omap_dss_device *in = ddata->in;
109 int r;
110 u8 buf[1];
111
112 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1);
113
114 if (r < 0)
115 return r;
116
117 *data = buf[0];
118
119 return 0;
120}
121
122static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
123{
124 struct omap_dss_device *in = ddata->in;
125 return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1);
126}
127
128static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
129{
130 struct omap_dss_device *in = ddata->in;
131 u8 buf[2] = { dcs_cmd, param };
132
133 return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
134}
135
136static int dsicm_sleep_in(struct panel_drv_data *ddata)
137
138{
139 struct omap_dss_device *in = ddata->in;
140 u8 cmd;
141 int r;
142
143 hw_guard_wait(ddata);
144
145 cmd = MIPI_DCS_ENTER_SLEEP_MODE;
146 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1);
147 if (r)
148 return r;
149
150 hw_guard_start(ddata, 120);
151
152 usleep_range(5000, 10000);
153
154 return 0;
155}
156
157static int dsicm_sleep_out(struct panel_drv_data *ddata)
158{
159 int r;
160
161 hw_guard_wait(ddata);
162
163 r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
164 if (r)
165 return r;
166
167 hw_guard_start(ddata, 120);
168
169 usleep_range(5000, 10000);
170
171 return 0;
172}
173
174static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
175{
176 int r;
177
178 r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
179 if (r)
180 return r;
181 r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
182 if (r)
183 return r;
184 r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
185 if (r)
186 return r;
187
188 return 0;
189}
190
191static int dsicm_set_update_window(struct panel_drv_data *ddata,
192 u16 x, u16 y, u16 w, u16 h)
193{
194 struct omap_dss_device *in = ddata->in;
195 int r;
196 u16 x1 = x;
197 u16 x2 = x + w - 1;
198 u16 y1 = y;
199 u16 y2 = y + h - 1;
200
201 u8 buf[5];
202 buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
203 buf[1] = (x1 >> 8) & 0xff;
204 buf[2] = (x1 >> 0) & 0xff;
205 buf[3] = (x2 >> 8) & 0xff;
206 buf[4] = (x2 >> 0) & 0xff;
207
208 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
209 if (r)
210 return r;
211
212 buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
213 buf[1] = (y1 >> 8) & 0xff;
214 buf[2] = (y1 >> 0) & 0xff;
215 buf[3] = (y2 >> 8) & 0xff;
216 buf[4] = (y2 >> 0) & 0xff;
217
218 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
219 if (r)
220 return r;
221
222 in->ops.dsi->bta_sync(in, ddata->channel);
223
224 return r;
225}
226
227static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
228{
229 if (ddata->ulps_timeout > 0)
230 schedule_delayed_work(&ddata->ulps_work,
231 msecs_to_jiffies(ddata->ulps_timeout));
232}
233
234static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
235{
236 cancel_delayed_work(&ddata->ulps_work);
237}
238
239static int dsicm_enter_ulps(struct panel_drv_data *ddata)
240{
241 struct omap_dss_device *in = ddata->in;
242 int r;
243
244 if (ddata->ulps_enabled)
245 return 0;
246
247 dsicm_cancel_ulps_work(ddata);
248
249 r = _dsicm_enable_te(ddata, false);
250 if (r)
251 goto err;
252
253 if (gpio_is_valid(ddata->ext_te_gpio))
254 disable_irq(gpio_to_irq(ddata->ext_te_gpio));
255
256 in->ops.dsi->disable(in, false, true);
257
258 ddata->ulps_enabled = true;
259
260 return 0;
261
262err:
263 dev_err(&ddata->pdev->dev, "enter ULPS failed");
264 dsicm_panel_reset(ddata);
265
266 ddata->ulps_enabled = false;
267
268 dsicm_queue_ulps_work(ddata);
269
270 return r;
271}
272
273static int dsicm_exit_ulps(struct panel_drv_data *ddata)
274{
275 struct omap_dss_device *in = ddata->in;
276 int r;
277
278 if (!ddata->ulps_enabled)
279 return 0;
280
281 r = in->ops.dsi->enable(in);
282 if (r) {
283 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
284 goto err1;
285 }
286
287 in->ops.dsi->enable_hs(in, ddata->channel, true);
288
289 r = _dsicm_enable_te(ddata, true);
290 if (r) {
291 dev_err(&ddata->pdev->dev, "failed to re-enable TE");
292 goto err2;
293 }
294
295 if (gpio_is_valid(ddata->ext_te_gpio))
296 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
297
298 dsicm_queue_ulps_work(ddata);
299
300 ddata->ulps_enabled = false;
301
302 return 0;
303
304err2:
305 dev_err(&ddata->pdev->dev, "failed to exit ULPS");
306
307 r = dsicm_panel_reset(ddata);
308 if (!r) {
309 if (gpio_is_valid(ddata->ext_te_gpio))
310 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
311 ddata->ulps_enabled = false;
312 }
313err1:
314 dsicm_queue_ulps_work(ddata);
315
316 return r;
317}
318
319static int dsicm_wake_up(struct panel_drv_data *ddata)
320{
321 if (ddata->ulps_enabled)
322 return dsicm_exit_ulps(ddata);
323
324 dsicm_cancel_ulps_work(ddata);
325 dsicm_queue_ulps_work(ddata);
326 return 0;
327}
328
329static int dsicm_bl_update_status(struct backlight_device *dev)
330{
331 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
332 struct omap_dss_device *in = ddata->in;
333 int r;
334 int level;
335
336 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
337 dev->props.power == FB_BLANK_UNBLANK)
338 level = dev->props.brightness;
339 else
340 level = 0;
341
342 dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
343
344 mutex_lock(&ddata->lock);
345
346 if (ddata->enabled) {
347 in->ops.dsi->bus_lock(in);
348
349 r = dsicm_wake_up(ddata);
350 if (!r)
351 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
352
353 in->ops.dsi->bus_unlock(in);
354 } else {
355 r = 0;
356 }
357
358 mutex_unlock(&ddata->lock);
359
360 return r;
361}
362
363static int dsicm_bl_get_intensity(struct backlight_device *dev)
364{
365 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
366 dev->props.power == FB_BLANK_UNBLANK)
367 return dev->props.brightness;
368
369 return 0;
370}
371
372static const struct backlight_ops dsicm_bl_ops = {
373 .get_brightness = dsicm_bl_get_intensity,
374 .update_status = dsicm_bl_update_status,
375};
376
377static void dsicm_get_resolution(struct omap_dss_device *dssdev,
378 u16 *xres, u16 *yres)
379{
380 *xres = dssdev->panel.timings.x_res;
381 *yres = dssdev->panel.timings.y_res;
382}
383
384static ssize_t dsicm_num_errors_show(struct device *dev,
385 struct device_attribute *attr, char *buf)
386{
387 struct panel_drv_data *ddata = dev_get_drvdata(dev);
388 struct omap_dss_device *in = ddata->in;
389 u8 errors = 0;
390 int r;
391
392 mutex_lock(&ddata->lock);
393
394 if (ddata->enabled) {
395 in->ops.dsi->bus_lock(in);
396
397 r = dsicm_wake_up(ddata);
398 if (!r)
399 r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
400 &errors);
401
402 in->ops.dsi->bus_unlock(in);
403 } else {
404 r = -ENODEV;
405 }
406
407 mutex_unlock(&ddata->lock);
408
409 if (r)
410 return r;
411
412 return snprintf(buf, PAGE_SIZE, "%d\n", errors);
413}
414
415static ssize_t dsicm_hw_revision_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417{
418 struct panel_drv_data *ddata = dev_get_drvdata(dev);
419 struct omap_dss_device *in = ddata->in;
420 u8 id1, id2, id3;
421 int r;
422
423 mutex_lock(&ddata->lock);
424
425 if (ddata->enabled) {
426 in->ops.dsi->bus_lock(in);
427
428 r = dsicm_wake_up(ddata);
429 if (!r)
430 r = dsicm_get_id(ddata, &id1, &id2, &id3);
431
432 in->ops.dsi->bus_unlock(in);
433 } else {
434 r = -ENODEV;
435 }
436
437 mutex_unlock(&ddata->lock);
438
439 if (r)
440 return r;
441
442 return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
443}
444
445static ssize_t dsicm_store_ulps(struct device *dev,
446 struct device_attribute *attr,
447 const char *buf, size_t count)
448{
449 struct panel_drv_data *ddata = dev_get_drvdata(dev);
450 struct omap_dss_device *in = ddata->in;
451 unsigned long t;
452 int r;
453
454 r = kstrtoul(buf, 0, &t);
455 if (r)
456 return r;
457
458 mutex_lock(&ddata->lock);
459
460 if (ddata->enabled) {
461 in->ops.dsi->bus_lock(in);
462
463 if (t)
464 r = dsicm_enter_ulps(ddata);
465 else
466 r = dsicm_wake_up(ddata);
467
468 in->ops.dsi->bus_unlock(in);
469 }
470
471 mutex_unlock(&ddata->lock);
472
473 if (r)
474 return r;
475
476 return count;
477}
478
479static ssize_t dsicm_show_ulps(struct device *dev,
480 struct device_attribute *attr,
481 char *buf)
482{
483 struct panel_drv_data *ddata = dev_get_drvdata(dev);
484 unsigned t;
485
486 mutex_lock(&ddata->lock);
487 t = ddata->ulps_enabled;
488 mutex_unlock(&ddata->lock);
489
490 return snprintf(buf, PAGE_SIZE, "%u\n", t);
491}
492
493static ssize_t dsicm_store_ulps_timeout(struct device *dev,
494 struct device_attribute *attr,
495 const char *buf, size_t count)
496{
497 struct panel_drv_data *ddata = dev_get_drvdata(dev);
498 struct omap_dss_device *in = ddata->in;
499 unsigned long t;
500 int r;
501
502 r = kstrtoul(buf, 0, &t);
503 if (r)
504 return r;
505
506 mutex_lock(&ddata->lock);
507 ddata->ulps_timeout = t;
508
509 if (ddata->enabled) {
510
511 in->ops.dsi->bus_lock(in);
512 r = dsicm_wake_up(ddata);
513 in->ops.dsi->bus_unlock(in);
514 }
515
516 mutex_unlock(&ddata->lock);
517
518 if (r)
519 return r;
520
521 return count;
522}
523
524static ssize_t dsicm_show_ulps_timeout(struct device *dev,
525 struct device_attribute *attr,
526 char *buf)
527{
528 struct panel_drv_data *ddata = dev_get_drvdata(dev);
529 unsigned t;
530
531 mutex_lock(&ddata->lock);
532 t = ddata->ulps_timeout;
533 mutex_unlock(&ddata->lock);
534
535 return snprintf(buf, PAGE_SIZE, "%u\n", t);
536}
537
538static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
539static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
540static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
541 dsicm_show_ulps, dsicm_store_ulps);
542static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
543 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
544
545static struct attribute *dsicm_attrs[] = {
546 &dev_attr_num_dsi_errors.attr,
547 &dev_attr_hw_revision.attr,
548 &dev_attr_ulps.attr,
549 &dev_attr_ulps_timeout.attr,
550 NULL,
551};
552
553static const struct attribute_group dsicm_attr_group = {
554 .attrs = dsicm_attrs,
555};
556
557static void dsicm_hw_reset(struct panel_drv_data *ddata)
558{
559 if (!gpio_is_valid(ddata->reset_gpio))
560 return;
561
562 gpio_set_value(ddata->reset_gpio, 1);
563 udelay(10);
564
565 gpio_set_value(ddata->reset_gpio, 0);
566
567 udelay(10);
568 gpio_set_value(ddata->reset_gpio, 1);
569
570 usleep_range(5000, 10000);
571}
572
573static int dsicm_power_on(struct panel_drv_data *ddata)
574{
575 struct omap_dss_device *in = ddata->in;
576 u8 id1, id2, id3;
577 int r;
578 struct omap_dss_dsi_config dsi_config = {
579 .mode = OMAP_DSS_DSI_CMD_MODE,
580 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
581 .timings = &ddata->timings,
582 .hs_clk_min = 150000000,
583 .hs_clk_max = 300000000,
584 .lp_clk_min = 7000000,
585 .lp_clk_max = 10000000,
586 };
587
588 if (ddata->pin_config.num_pins > 0) {
589 r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
590 if (r) {
591 dev_err(&ddata->pdev->dev,
592 "failed to configure DSI pins\n");
593 goto err0;
594 }
595 }
596
597 r = in->ops.dsi->set_config(in, &dsi_config);
598 if (r) {
599 dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
600 goto err0;
601 }
602
603 r = in->ops.dsi->enable(in);
604 if (r) {
605 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
606 goto err0;
607 }
608
609 dsicm_hw_reset(ddata);
610
611 in->ops.dsi->enable_hs(in, ddata->channel, false);
612
613 r = dsicm_sleep_out(ddata);
614 if (r)
615 goto err;
616
617 r = dsicm_get_id(ddata, &id1, &id2, &id3);
618 if (r)
619 goto err;
620
621 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
622 if (r)
623 goto err;
624
625 r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
626 (1<<2) | (1<<5));
627 if (r)
628 goto err;
629
630 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
631 MIPI_DCS_PIXEL_FMT_24BIT);
632 if (r)
633 goto err;
634
635 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
636 if (r)
637 goto err;
638
639 r = _dsicm_enable_te(ddata, ddata->te_enabled);
640 if (r)
641 goto err;
642
643 r = in->ops.dsi->enable_video_output(in, ddata->channel);
644 if (r)
645 goto err;
646
647 ddata->enabled = 1;
648
649 if (!ddata->intro_printed) {
650 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
651 id1, id2, id3);
652 ddata->intro_printed = true;
653 }
654
655 in->ops.dsi->enable_hs(in, ddata->channel, true);
656
657 return 0;
658err:
659 dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
660
661 dsicm_hw_reset(ddata);
662
663 in->ops.dsi->disable(in, true, false);
664err0:
665 return r;
666}
667
668static void dsicm_power_off(struct panel_drv_data *ddata)
669{
670 struct omap_dss_device *in = ddata->in;
671 int r;
672
673 in->ops.dsi->disable_video_output(in, ddata->channel);
674
675 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
676 if (!r)
677 r = dsicm_sleep_in(ddata);
678
679 if (r) {
680 dev_err(&ddata->pdev->dev,
681 "error disabling panel, issuing HW reset\n");
682 dsicm_hw_reset(ddata);
683 }
684
685 in->ops.dsi->disable(in, true, false);
686
687 ddata->enabled = 0;
688}
689
690static int dsicm_panel_reset(struct panel_drv_data *ddata)
691{
692 dev_err(&ddata->pdev->dev, "performing LCD reset\n");
693
694 dsicm_power_off(ddata);
695 dsicm_hw_reset(ddata);
696 return dsicm_power_on(ddata);
697}
698
699static int dsicm_connect(struct omap_dss_device *dssdev)
700{
701 struct panel_drv_data *ddata = to_panel_data(dssdev);
702 struct omap_dss_device *in = ddata->in;
703 struct device *dev = &ddata->pdev->dev;
704 int r;
705
706 if (omapdss_device_is_connected(dssdev))
707 return 0;
708
709 r = in->ops.dsi->connect(in, dssdev);
710 if (r) {
711 dev_err(dev, "Failed to connect to video source\n");
712 return r;
713 }
714
715 r = in->ops.dsi->request_vc(ddata->in, &ddata->channel);
716 if (r) {
717 dev_err(dev, "failed to get virtual channel\n");
718 goto err_req_vc;
719 }
720
721 r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH);
722 if (r) {
723 dev_err(dev, "failed to set VC_ID\n");
724 goto err_vc_id;
725 }
726
727 return 0;
728
729err_vc_id:
730 in->ops.dsi->release_vc(ddata->in, ddata->channel);
731err_req_vc:
732 in->ops.dsi->disconnect(in, dssdev);
733 return r;
734}
735
736static void dsicm_disconnect(struct omap_dss_device *dssdev)
737{
738 struct panel_drv_data *ddata = to_panel_data(dssdev);
739 struct omap_dss_device *in = ddata->in;
740
741 if (!omapdss_device_is_connected(dssdev))
742 return;
743
744 in->ops.dsi->release_vc(in, ddata->channel);
745 in->ops.dsi->disconnect(in, dssdev);
746}
747
748static int dsicm_enable(struct omap_dss_device *dssdev)
749{
750 struct panel_drv_data *ddata = to_panel_data(dssdev);
751 struct omap_dss_device *in = ddata->in;
752 int r;
753
754 dev_dbg(&ddata->pdev->dev, "enable\n");
755
756 mutex_lock(&ddata->lock);
757
758 if (!omapdss_device_is_connected(dssdev)) {
759 r = -ENODEV;
760 goto err;
761 }
762
763 if (omapdss_device_is_enabled(dssdev)) {
764 r = 0;
765 goto err;
766 }
767
768 in->ops.dsi->bus_lock(in);
769
770 r = dsicm_power_on(ddata);
771
772 in->ops.dsi->bus_unlock(in);
773
774 if (r)
775 goto err;
776
777 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
778
779 mutex_unlock(&ddata->lock);
780
781 return 0;
782err:
783 dev_dbg(&ddata->pdev->dev, "enable failed\n");
784 mutex_unlock(&ddata->lock);
785 return r;
786}
787
788static void dsicm_disable(struct omap_dss_device *dssdev)
789{
790 struct panel_drv_data *ddata = to_panel_data(dssdev);
791 struct omap_dss_device *in = ddata->in;
792 int r;
793
794 dev_dbg(&ddata->pdev->dev, "disable\n");
795
796 mutex_lock(&ddata->lock);
797
798 dsicm_cancel_ulps_work(ddata);
799
800 in->ops.dsi->bus_lock(in);
801
802 if (omapdss_device_is_enabled(dssdev)) {
803 r = dsicm_wake_up(ddata);
804 if (!r)
805 dsicm_power_off(ddata);
806 }
807
808 in->ops.dsi->bus_unlock(in);
809
810 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
811
812 mutex_unlock(&ddata->lock);
813}
814
815static void dsicm_framedone_cb(int err, void *data)
816{
817 struct panel_drv_data *ddata = data;
818 struct omap_dss_device *in = ddata->in;
819
820 dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
821 in->ops.dsi->bus_unlock(ddata->in);
822}
823
824static irqreturn_t dsicm_te_isr(int irq, void *data)
825{
826 struct panel_drv_data *ddata = data;
827 struct omap_dss_device *in = ddata->in;
828 int old;
829 int r;
830
831 old = atomic_cmpxchg(&ddata->do_update, 1, 0);
832
833 if (old) {
834 cancel_delayed_work(&ddata->te_timeout_work);
835
836 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
837 ddata);
838 if (r)
839 goto err;
840 }
841
842 return IRQ_HANDLED;
843err:
844 dev_err(&ddata->pdev->dev, "start update failed\n");
845 in->ops.dsi->bus_unlock(in);
846 return IRQ_HANDLED;
847}
848
849static void dsicm_te_timeout_work_callback(struct work_struct *work)
850{
851 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
852 te_timeout_work.work);
853 struct omap_dss_device *in = ddata->in;
854
855 dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
856
857 atomic_set(&ddata->do_update, 0);
858 in->ops.dsi->bus_unlock(in);
859}
860
861static int dsicm_update(struct omap_dss_device *dssdev,
862 u16 x, u16 y, u16 w, u16 h)
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, "update %d, %d, %d x %d\n", x, y, w, h);
869
870 mutex_lock(&ddata->lock);
871 in->ops.dsi->bus_lock(in);
872
873 r = dsicm_wake_up(ddata);
874 if (r)
875 goto err;
876
877 if (!ddata->enabled) {
878 r = 0;
879 goto err;
880 }
881
882
883 r = dsicm_set_update_window(ddata, 0, 0,
884 dssdev->panel.timings.x_res,
885 dssdev->panel.timings.y_res);
886 if (r)
887 goto err;
888
889 if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) {
890 schedule_delayed_work(&ddata->te_timeout_work,
891 msecs_to_jiffies(250));
892 atomic_set(&ddata->do_update, 1);
893 } else {
894 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
895 ddata);
896 if (r)
897 goto err;
898 }
899
900
901 mutex_unlock(&ddata->lock);
902 return 0;
903err:
904 in->ops.dsi->bus_unlock(in);
905 mutex_unlock(&ddata->lock);
906 return r;
907}
908
909static int dsicm_sync(struct omap_dss_device *dssdev)
910{
911 struct panel_drv_data *ddata = to_panel_data(dssdev);
912 struct omap_dss_device *in = ddata->in;
913
914 dev_dbg(&ddata->pdev->dev, "sync\n");
915
916 mutex_lock(&ddata->lock);
917 in->ops.dsi->bus_lock(in);
918 in->ops.dsi->bus_unlock(in);
919 mutex_unlock(&ddata->lock);
920
921 dev_dbg(&ddata->pdev->dev, "sync done\n");
922
923 return 0;
924}
925
926static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
927{
928 struct omap_dss_device *in = ddata->in;
929 int r;
930
931 if (enable)
932 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
933 else
934 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
935
936 if (!gpio_is_valid(ddata->ext_te_gpio))
937 in->ops.dsi->enable_te(in, enable);
938
939
940 msleep(100);
941
942 return r;
943}
944
945static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
946{
947 struct panel_drv_data *ddata = to_panel_data(dssdev);
948 struct omap_dss_device *in = ddata->in;
949 int r;
950
951 mutex_lock(&ddata->lock);
952
953 if (ddata->te_enabled == enable)
954 goto end;
955
956 in->ops.dsi->bus_lock(in);
957
958 if (ddata->enabled) {
959 r = dsicm_wake_up(ddata);
960 if (r)
961 goto err;
962
963 r = _dsicm_enable_te(ddata, enable);
964 if (r)
965 goto err;
966 }
967
968 ddata->te_enabled = enable;
969
970 in->ops.dsi->bus_unlock(in);
971end:
972 mutex_unlock(&ddata->lock);
973
974 return 0;
975err:
976 in->ops.dsi->bus_unlock(in);
977 mutex_unlock(&ddata->lock);
978
979 return r;
980}
981
982static int dsicm_get_te(struct omap_dss_device *dssdev)
983{
984 struct panel_drv_data *ddata = to_panel_data(dssdev);
985 int r;
986
987 mutex_lock(&ddata->lock);
988 r = ddata->te_enabled;
989 mutex_unlock(&ddata->lock);
990
991 return r;
992}
993
994static int dsicm_memory_read(struct omap_dss_device *dssdev,
995 void *buf, size_t size,
996 u16 x, u16 y, u16 w, u16 h)
997{
998 struct panel_drv_data *ddata = to_panel_data(dssdev);
999 struct omap_dss_device *in = ddata->in;
1000 int r;
1001 int first = 1;
1002 int plen;
1003 unsigned buf_used = 0;
1004
1005 if (size < w * h * 3)
1006 return -ENOMEM;
1007
1008 mutex_lock(&ddata->lock);
1009
1010 if (!ddata->enabled) {
1011 r = -ENODEV;
1012 goto err1;
1013 }
1014
1015 size = min(w * h * 3,
1016 dssdev->panel.timings.x_res *
1017 dssdev->panel.timings.y_res * 3);
1018
1019 in->ops.dsi->bus_lock(in);
1020
1021 r = dsicm_wake_up(ddata);
1022 if (r)
1023 goto err2;
1024
1025
1026
1027
1028 if (size % 2)
1029 plen = 1;
1030 else
1031 plen = 2;
1032
1033 dsicm_set_update_window(ddata, x, y, w, h);
1034
1035 r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
1036 if (r)
1037 goto err2;
1038
1039 while (buf_used < size) {
1040 u8 dcs_cmd = first ? 0x2e : 0x3e;
1041 first = 0;
1042
1043 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd,
1044 buf + buf_used, size - buf_used);
1045
1046 if (r < 0) {
1047 dev_err(dssdev->dev, "read error\n");
1048 goto err3;
1049 }
1050
1051 buf_used += r;
1052
1053 if (r < plen) {
1054 dev_err(&ddata->pdev->dev, "short read\n");
1055 break;
1056 }
1057
1058 if (signal_pending(current)) {
1059 dev_err(&ddata->pdev->dev, "signal pending, "
1060 "aborting memory read\n");
1061 r = -ERESTARTSYS;
1062 goto err3;
1063 }
1064 }
1065
1066 r = buf_used;
1067
1068err3:
1069 in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
1070err2:
1071 in->ops.dsi->bus_unlock(in);
1072err1:
1073 mutex_unlock(&ddata->lock);
1074 return r;
1075}
1076
1077static void dsicm_ulps_work(struct work_struct *work)
1078{
1079 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
1080 ulps_work.work);
1081 struct omap_dss_device *dssdev = &ddata->dssdev;
1082 struct omap_dss_device *in = ddata->in;
1083
1084 mutex_lock(&ddata->lock);
1085
1086 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
1087 mutex_unlock(&ddata->lock);
1088 return;
1089 }
1090
1091 in->ops.dsi->bus_lock(in);
1092
1093 dsicm_enter_ulps(ddata);
1094
1095 in->ops.dsi->bus_unlock(in);
1096 mutex_unlock(&ddata->lock);
1097}
1098
1099static struct omap_dss_driver dsicm_ops = {
1100 .connect = dsicm_connect,
1101 .disconnect = dsicm_disconnect,
1102
1103 .enable = dsicm_enable,
1104 .disable = dsicm_disable,
1105
1106 .update = dsicm_update,
1107 .sync = dsicm_sync,
1108
1109 .get_resolution = dsicm_get_resolution,
1110 .get_recommended_bpp = omapdss_default_get_recommended_bpp,
1111
1112 .enable_te = dsicm_enable_te,
1113 .get_te = dsicm_get_te,
1114
1115 .memory_read = dsicm_memory_read,
1116};
1117
1118static int dsicm_probe_of(struct platform_device *pdev)
1119{
1120 struct device_node *node = pdev->dev.of_node;
1121 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1122 struct omap_dss_device *in;
1123 int gpio;
1124
1125 gpio = of_get_named_gpio(node, "reset-gpios", 0);
1126 if (!gpio_is_valid(gpio)) {
1127 dev_err(&pdev->dev, "failed to parse reset gpio\n");
1128 return gpio;
1129 }
1130 ddata->reset_gpio = gpio;
1131
1132 gpio = of_get_named_gpio(node, "te-gpios", 0);
1133 if (gpio_is_valid(gpio) || gpio == -ENOENT) {
1134 ddata->ext_te_gpio = gpio;
1135 } else {
1136 dev_err(&pdev->dev, "failed to parse TE gpio\n");
1137 return gpio;
1138 }
1139
1140 in = omapdss_of_find_source_for_first_ep(node);
1141 if (IS_ERR(in)) {
1142 dev_err(&pdev->dev, "failed to find video source\n");
1143 return PTR_ERR(in);
1144 }
1145
1146 ddata->in = in;
1147
1148
1149
1150 return 0;
1151}
1152
1153static int dsicm_probe(struct platform_device *pdev)
1154{
1155 struct backlight_properties props;
1156 struct panel_drv_data *ddata;
1157 struct backlight_device *bldev = NULL;
1158 struct device *dev = &pdev->dev;
1159 struct omap_dss_device *dssdev;
1160 int r;
1161
1162 dev_dbg(dev, "probe\n");
1163
1164 if (!pdev->dev.of_node)
1165 return -ENODEV;
1166
1167 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
1168 if (!ddata)
1169 return -ENOMEM;
1170
1171 platform_set_drvdata(pdev, ddata);
1172 ddata->pdev = pdev;
1173
1174 r = dsicm_probe_of(pdev);
1175 if (r)
1176 return r;
1177
1178 ddata->timings.x_res = 864;
1179 ddata->timings.y_res = 480;
1180 ddata->timings.pixelclock = 864 * 480 * 60;
1181
1182 dssdev = &ddata->dssdev;
1183 dssdev->dev = dev;
1184 dssdev->driver = &dsicm_ops;
1185 dssdev->panel.timings = ddata->timings;
1186 dssdev->type = OMAP_DISPLAY_TYPE_DSI;
1187 dssdev->owner = THIS_MODULE;
1188
1189 dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
1190 dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
1191 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
1192
1193 r = omapdss_register_display(dssdev);
1194 if (r) {
1195 dev_err(dev, "Failed to register panel\n");
1196 goto err_reg;
1197 }
1198
1199 mutex_init(&ddata->lock);
1200
1201 atomic_set(&ddata->do_update, 0);
1202
1203 if (gpio_is_valid(ddata->reset_gpio)) {
1204 r = devm_gpio_request_one(dev, ddata->reset_gpio,
1205 GPIOF_OUT_INIT_LOW, "taal rst");
1206 if (r) {
1207 dev_err(dev, "failed to request reset gpio\n");
1208 return r;
1209 }
1210 }
1211
1212 if (gpio_is_valid(ddata->ext_te_gpio)) {
1213 r = devm_gpio_request_one(dev, ddata->ext_te_gpio,
1214 GPIOF_IN, "taal irq");
1215 if (r) {
1216 dev_err(dev, "GPIO request failed\n");
1217 return r;
1218 }
1219
1220 r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio),
1221 dsicm_te_isr,
1222 IRQF_TRIGGER_RISING,
1223 "taal vsync", ddata);
1224
1225 if (r) {
1226 dev_err(dev, "IRQ request failed\n");
1227 return r;
1228 }
1229
1230 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
1231 dsicm_te_timeout_work_callback);
1232
1233 dev_dbg(dev, "Using GPIO TE\n");
1234 }
1235
1236 INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
1237
1238 dsicm_hw_reset(ddata);
1239
1240 if (ddata->use_dsi_backlight) {
1241 memset(&props, 0, sizeof(struct backlight_properties));
1242 props.max_brightness = 255;
1243
1244 props.type = BACKLIGHT_RAW;
1245 bldev = backlight_device_register(dev_name(dev),
1246 dev, ddata, &dsicm_bl_ops, &props);
1247 if (IS_ERR(bldev)) {
1248 r = PTR_ERR(bldev);
1249 goto err_reg;
1250 }
1251
1252 ddata->bldev = bldev;
1253
1254 bldev->props.fb_blank = FB_BLANK_UNBLANK;
1255 bldev->props.power = FB_BLANK_UNBLANK;
1256 bldev->props.brightness = 255;
1257
1258 dsicm_bl_update_status(bldev);
1259 }
1260
1261 r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
1262 if (r) {
1263 dev_err(dev, "failed to create sysfs files\n");
1264 goto err_sysfs_create;
1265 }
1266
1267 return 0;
1268
1269err_sysfs_create:
1270 if (bldev != NULL)
1271 backlight_device_unregister(bldev);
1272err_reg:
1273 return r;
1274}
1275
1276static int __exit dsicm_remove(struct platform_device *pdev)
1277{
1278 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1279 struct omap_dss_device *dssdev = &ddata->dssdev;
1280 struct backlight_device *bldev;
1281
1282 dev_dbg(&pdev->dev, "remove\n");
1283
1284 omapdss_unregister_display(dssdev);
1285
1286 dsicm_disable(dssdev);
1287 dsicm_disconnect(dssdev);
1288
1289 sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
1290
1291 bldev = ddata->bldev;
1292 if (bldev != NULL) {
1293 bldev->props.power = FB_BLANK_POWERDOWN;
1294 dsicm_bl_update_status(bldev);
1295 backlight_device_unregister(bldev);
1296 }
1297
1298 omap_dss_put_device(ddata->in);
1299
1300 dsicm_cancel_ulps_work(ddata);
1301
1302
1303 dsicm_hw_reset(ddata);
1304
1305 return 0;
1306}
1307
1308static const struct of_device_id dsicm_of_match[] = {
1309 { .compatible = "omapdss,panel-dsi-cm", },
1310 {},
1311};
1312
1313MODULE_DEVICE_TABLE(of, dsicm_of_match);
1314
1315static struct platform_driver dsicm_driver = {
1316 .probe = dsicm_probe,
1317 .remove = __exit_p(dsicm_remove),
1318 .driver = {
1319 .name = "panel-dsi-cm",
1320 .of_match_table = dsicm_of_match,
1321 .suppress_bind_attrs = true,
1322 },
1323};
1324
1325module_platform_driver(dsicm_driver);
1326
1327MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
1328MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
1329MODULE_LICENSE("GPL");
1330
