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14#include <linux/backlight.h>
15#include <linux/delay.h>
16#include <linux/fb.h>
17#include <linux/gpio.h>
18#include <linux/interrupt.h>
19#include <linux/jiffies.h>
20#include <linux/module.h>
21#include <linux/platform_device.h>
22#include <linux/sched/signal.h>
23#include <linux/slab.h>
24#include <linux/workqueue.h>
25#include <linux/of_device.h>
26#include <linux/of_gpio.h>
27
28#include <video/omapfb_dss.h>
29#include <video/mipi_display.h>
30
31
32#define TCH 0
33
34#define DCS_READ_NUM_ERRORS 0x05
35#define DCS_BRIGHTNESS 0x51
36#define DCS_CTRL_DISPLAY 0x53
37#define DCS_GET_ID1 0xda
38#define DCS_GET_ID2 0xdb
39#define DCS_GET_ID3 0xdc
40
41struct panel_drv_data {
42 struct omap_dss_device dssdev;
43 struct omap_dss_device *in;
44
45 struct omap_video_timings timings;
46
47 struct platform_device *pdev;
48
49 struct mutex lock;
50
51 struct backlight_device *bldev;
52
53 unsigned long hw_guard_end;
54
55
56 unsigned long hw_guard_wait;
57
58
59 int reset_gpio;
60 int ext_te_gpio;
61
62 bool use_dsi_backlight;
63
64 struct omap_dsi_pin_config pin_config;
65
66
67 bool enabled;
68
69 bool te_enabled;
70
71 atomic_t do_update;
72 int channel;
73
74 struct delayed_work te_timeout_work;
75
76 bool intro_printed;
77
78 bool ulps_enabled;
79 unsigned ulps_timeout;
80 struct delayed_work ulps_work;
81};
82
83#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
84
85static irqreturn_t dsicm_te_isr(int irq, void *data);
86static void dsicm_te_timeout_work_callback(struct work_struct *work);
87static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
88
89static int dsicm_panel_reset(struct panel_drv_data *ddata);
90
91static void dsicm_ulps_work(struct work_struct *work);
92
93static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
94{
95 ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
96 ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
97}
98
99static void hw_guard_wait(struct panel_drv_data *ddata)
100{
101 unsigned long wait = ddata->hw_guard_end - jiffies;
102
103 if ((long)wait > 0 && time_before_eq(wait, ddata->hw_guard_wait)) {
104 set_current_state(TASK_UNINTERRUPTIBLE);
105 schedule_timeout(wait);
106 }
107}
108
109static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
110{
111 struct omap_dss_device *in = ddata->in;
112 int r;
113 u8 buf[1];
114
115 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1);
116
117 if (r < 0)
118 return r;
119
120 *data = buf[0];
121
122 return 0;
123}
124
125static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
126{
127 struct omap_dss_device *in = ddata->in;
128 return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1);
129}
130
131static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
132{
133 struct omap_dss_device *in = ddata->in;
134 u8 buf[2] = { dcs_cmd, param };
135
136 return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
137}
138
139static int dsicm_sleep_in(struct panel_drv_data *ddata)
140
141{
142 struct omap_dss_device *in = ddata->in;
143 u8 cmd;
144 int r;
145
146 hw_guard_wait(ddata);
147
148 cmd = MIPI_DCS_ENTER_SLEEP_MODE;
149 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1);
150 if (r)
151 return r;
152
153 hw_guard_start(ddata, 120);
154
155 usleep_range(5000, 10000);
156
157 return 0;
158}
159
160static int dsicm_sleep_out(struct panel_drv_data *ddata)
161{
162 int r;
163
164 hw_guard_wait(ddata);
165
166 r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
167 if (r)
168 return r;
169
170 hw_guard_start(ddata, 120);
171
172 usleep_range(5000, 10000);
173
174 return 0;
175}
176
177static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
178{
179 int r;
180
181 r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
182 if (r)
183 return r;
184 r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
185 if (r)
186 return r;
187 r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
188 if (r)
189 return r;
190
191 return 0;
192}
193
194static int dsicm_set_update_window(struct panel_drv_data *ddata,
195 u16 x, u16 y, u16 w, u16 h)
196{
197 struct omap_dss_device *in = ddata->in;
198 int r;
199 u16 x1 = x;
200 u16 x2 = x + w - 1;
201 u16 y1 = y;
202 u16 y2 = y + h - 1;
203
204 u8 buf[5];
205 buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
206 buf[1] = (x1 >> 8) & 0xff;
207 buf[2] = (x1 >> 0) & 0xff;
208 buf[3] = (x2 >> 8) & 0xff;
209 buf[4] = (x2 >> 0) & 0xff;
210
211 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
212 if (r)
213 return r;
214
215 buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
216 buf[1] = (y1 >> 8) & 0xff;
217 buf[2] = (y1 >> 0) & 0xff;
218 buf[3] = (y2 >> 8) & 0xff;
219 buf[4] = (y2 >> 0) & 0xff;
220
221 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
222 if (r)
223 return r;
224
225 in->ops.dsi->bta_sync(in, ddata->channel);
226
227 return r;
228}
229
230static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
231{
232 if (ddata->ulps_timeout > 0)
233 schedule_delayed_work(&ddata->ulps_work,
234 msecs_to_jiffies(ddata->ulps_timeout));
235}
236
237static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
238{
239 cancel_delayed_work(&ddata->ulps_work);
240}
241
242static int dsicm_enter_ulps(struct panel_drv_data *ddata)
243{
244 struct omap_dss_device *in = ddata->in;
245 int r;
246
247 if (ddata->ulps_enabled)
248 return 0;
249
250 dsicm_cancel_ulps_work(ddata);
251
252 r = _dsicm_enable_te(ddata, false);
253 if (r)
254 goto err;
255
256 if (gpio_is_valid(ddata->ext_te_gpio))
257 disable_irq(gpio_to_irq(ddata->ext_te_gpio));
258
259 in->ops.dsi->disable(in, false, true);
260
261 ddata->ulps_enabled = true;
262
263 return 0;
264
265err:
266 dev_err(&ddata->pdev->dev, "enter ULPS failed");
267 dsicm_panel_reset(ddata);
268
269 ddata->ulps_enabled = false;
270
271 dsicm_queue_ulps_work(ddata);
272
273 return r;
274}
275
276static int dsicm_exit_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 r = in->ops.dsi->enable(in);
285 if (r) {
286 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
287 goto err1;
288 }
289
290 in->ops.dsi->enable_hs(in, ddata->channel, true);
291
292 r = _dsicm_enable_te(ddata, true);
293 if (r) {
294 dev_err(&ddata->pdev->dev, "failed to re-enable TE");
295 goto err2;
296 }
297
298 if (gpio_is_valid(ddata->ext_te_gpio))
299 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
300
301 dsicm_queue_ulps_work(ddata);
302
303 ddata->ulps_enabled = false;
304
305 return 0;
306
307err2:
308 dev_err(&ddata->pdev->dev, "failed to exit ULPS");
309
310 r = dsicm_panel_reset(ddata);
311 if (!r) {
312 if (gpio_is_valid(ddata->ext_te_gpio))
313 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
314 ddata->ulps_enabled = false;
315 }
316err1:
317 dsicm_queue_ulps_work(ddata);
318
319 return r;
320}
321
322static int dsicm_wake_up(struct panel_drv_data *ddata)
323{
324 if (ddata->ulps_enabled)
325 return dsicm_exit_ulps(ddata);
326
327 dsicm_cancel_ulps_work(ddata);
328 dsicm_queue_ulps_work(ddata);
329 return 0;
330}
331
332static int dsicm_bl_update_status(struct backlight_device *dev)
333{
334 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
335 struct omap_dss_device *in = ddata->in;
336 int r;
337 int level;
338
339 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
340 dev->props.power == FB_BLANK_UNBLANK)
341 level = dev->props.brightness;
342 else
343 level = 0;
344
345 dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
346
347 mutex_lock(&ddata->lock);
348
349 if (ddata->enabled) {
350 in->ops.dsi->bus_lock(in);
351
352 r = dsicm_wake_up(ddata);
353 if (!r)
354 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
355
356 in->ops.dsi->bus_unlock(in);
357 } else {
358 r = 0;
359 }
360
361 mutex_unlock(&ddata->lock);
362
363 return r;
364}
365
366static int dsicm_bl_get_intensity(struct backlight_device *dev)
367{
368 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
369 dev->props.power == FB_BLANK_UNBLANK)
370 return dev->props.brightness;
371
372 return 0;
373}
374
375static const struct backlight_ops dsicm_bl_ops = {
376 .get_brightness = dsicm_bl_get_intensity,
377 .update_status = dsicm_bl_update_status,
378};
379
380static void dsicm_get_resolution(struct omap_dss_device *dssdev,
381 u16 *xres, u16 *yres)
382{
383 *xres = dssdev->panel.timings.x_res;
384 *yres = dssdev->panel.timings.y_res;
385}
386
387static ssize_t dsicm_num_errors_show(struct device *dev,
388 struct device_attribute *attr, char *buf)
389{
390 struct panel_drv_data *ddata = dev_get_drvdata(dev);
391 struct omap_dss_device *in = ddata->in;
392 u8 errors = 0;
393 int r;
394
395 mutex_lock(&ddata->lock);
396
397 if (ddata->enabled) {
398 in->ops.dsi->bus_lock(in);
399
400 r = dsicm_wake_up(ddata);
401 if (!r)
402 r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
403 &errors);
404
405 in->ops.dsi->bus_unlock(in);
406 } else {
407 r = -ENODEV;
408 }
409
410 mutex_unlock(&ddata->lock);
411
412 if (r)
413 return r;
414
415 return snprintf(buf, PAGE_SIZE, "%d\n", errors);
416}
417
418static ssize_t dsicm_hw_revision_show(struct device *dev,
419 struct device_attribute *attr, char *buf)
420{
421 struct panel_drv_data *ddata = dev_get_drvdata(dev);
422 struct omap_dss_device *in = ddata->in;
423 u8 id1, id2, id3;
424 int r;
425
426 mutex_lock(&ddata->lock);
427
428 if (ddata->enabled) {
429 in->ops.dsi->bus_lock(in);
430
431 r = dsicm_wake_up(ddata);
432 if (!r)
433 r = dsicm_get_id(ddata, &id1, &id2, &id3);
434
435 in->ops.dsi->bus_unlock(in);
436 } else {
437 r = -ENODEV;
438 }
439
440 mutex_unlock(&ddata->lock);
441
442 if (r)
443 return r;
444
445 return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
446}
447
448static ssize_t dsicm_store_ulps(struct device *dev,
449 struct device_attribute *attr,
450 const char *buf, size_t count)
451{
452 struct panel_drv_data *ddata = dev_get_drvdata(dev);
453 struct omap_dss_device *in = ddata->in;
454 unsigned long t;
455 int r;
456
457 r = kstrtoul(buf, 0, &t);
458 if (r)
459 return r;
460
461 mutex_lock(&ddata->lock);
462
463 if (ddata->enabled) {
464 in->ops.dsi->bus_lock(in);
465
466 if (t)
467 r = dsicm_enter_ulps(ddata);
468 else
469 r = dsicm_wake_up(ddata);
470
471 in->ops.dsi->bus_unlock(in);
472 }
473
474 mutex_unlock(&ddata->lock);
475
476 if (r)
477 return r;
478
479 return count;
480}
481
482static ssize_t dsicm_show_ulps(struct device *dev,
483 struct device_attribute *attr,
484 char *buf)
485{
486 struct panel_drv_data *ddata = dev_get_drvdata(dev);
487 unsigned t;
488
489 mutex_lock(&ddata->lock);
490 t = ddata->ulps_enabled;
491 mutex_unlock(&ddata->lock);
492
493 return snprintf(buf, PAGE_SIZE, "%u\n", t);
494}
495
496static ssize_t dsicm_store_ulps_timeout(struct device *dev,
497 struct device_attribute *attr,
498 const char *buf, size_t count)
499{
500 struct panel_drv_data *ddata = dev_get_drvdata(dev);
501 struct omap_dss_device *in = ddata->in;
502 unsigned long t;
503 int r;
504
505 r = kstrtoul(buf, 0, &t);
506 if (r)
507 return r;
508
509 mutex_lock(&ddata->lock);
510 ddata->ulps_timeout = t;
511
512 if (ddata->enabled) {
513
514 in->ops.dsi->bus_lock(in);
515 r = dsicm_wake_up(ddata);
516 in->ops.dsi->bus_unlock(in);
517 }
518
519 mutex_unlock(&ddata->lock);
520
521 if (r)
522 return r;
523
524 return count;
525}
526
527static ssize_t dsicm_show_ulps_timeout(struct device *dev,
528 struct device_attribute *attr,
529 char *buf)
530{
531 struct panel_drv_data *ddata = dev_get_drvdata(dev);
532 unsigned t;
533
534 mutex_lock(&ddata->lock);
535 t = ddata->ulps_timeout;
536 mutex_unlock(&ddata->lock);
537
538 return snprintf(buf, PAGE_SIZE, "%u\n", t);
539}
540
541static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
542static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
543static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
544 dsicm_show_ulps, dsicm_store_ulps);
545static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
546 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
547
548static struct attribute *dsicm_attrs[] = {
549 &dev_attr_num_dsi_errors.attr,
550 &dev_attr_hw_revision.attr,
551 &dev_attr_ulps.attr,
552 &dev_attr_ulps_timeout.attr,
553 NULL,
554};
555
556static const struct attribute_group dsicm_attr_group = {
557 .attrs = dsicm_attrs,
558};
559
560static void dsicm_hw_reset(struct panel_drv_data *ddata)
561{
562 if (!gpio_is_valid(ddata->reset_gpio))
563 return;
564
565 gpio_set_value(ddata->reset_gpio, 1);
566 udelay(10);
567
568 gpio_set_value(ddata->reset_gpio, 0);
569
570 udelay(10);
571 gpio_set_value(ddata->reset_gpio, 1);
572
573 usleep_range(5000, 10000);
574}
575
576static int dsicm_power_on(struct panel_drv_data *ddata)
577{
578 struct omap_dss_device *in = ddata->in;
579 u8 id1, id2, id3;
580 int r;
581 struct omap_dss_dsi_config dsi_config = {
582 .mode = OMAP_DSS_DSI_CMD_MODE,
583 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
584 .timings = &ddata->timings,
585 .hs_clk_min = 150000000,
586 .hs_clk_max = 300000000,
587 .lp_clk_min = 7000000,
588 .lp_clk_max = 10000000,
589 };
590
591 if (ddata->pin_config.num_pins > 0) {
592 r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
593 if (r) {
594 dev_err(&ddata->pdev->dev,
595 "failed to configure DSI pins\n");
596 goto err0;
597 }
598 }
599
600 r = in->ops.dsi->set_config(in, &dsi_config);
601 if (r) {
602 dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
603 goto err0;
604 }
605
606 r = in->ops.dsi->enable(in);
607 if (r) {
608 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
609 goto err0;
610 }
611
612 dsicm_hw_reset(ddata);
613
614 in->ops.dsi->enable_hs(in, ddata->channel, false);
615
616 r = dsicm_sleep_out(ddata);
617 if (r)
618 goto err;
619
620 r = dsicm_get_id(ddata, &id1, &id2, &id3);
621 if (r)
622 goto err;
623
624 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
625 if (r)
626 goto err;
627
628 r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
629 (1<<2) | (1<<5));
630 if (r)
631 goto err;
632
633 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
634 MIPI_DCS_PIXEL_FMT_24BIT);
635 if (r)
636 goto err;
637
638 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
639 if (r)
640 goto err;
641
642 r = _dsicm_enable_te(ddata, ddata->te_enabled);
643 if (r)
644 goto err;
645
646 r = in->ops.dsi->enable_video_output(in, ddata->channel);
647 if (r)
648 goto err;
649
650 ddata->enabled = 1;
651
652 if (!ddata->intro_printed) {
653 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
654 id1, id2, id3);
655 ddata->intro_printed = true;
656 }
657
658 in->ops.dsi->enable_hs(in, ddata->channel, true);
659
660 return 0;
661err:
662 dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
663
664 dsicm_hw_reset(ddata);
665
666 in->ops.dsi->disable(in, true, false);
667err0:
668 return r;
669}
670
671static void dsicm_power_off(struct panel_drv_data *ddata)
672{
673 struct omap_dss_device *in = ddata->in;
674 int r;
675
676 in->ops.dsi->disable_video_output(in, ddata->channel);
677
678 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
679 if (!r)
680 r = dsicm_sleep_in(ddata);
681
682 if (r) {
683 dev_err(&ddata->pdev->dev,
684 "error disabling panel, issuing HW reset\n");
685 dsicm_hw_reset(ddata);
686 }
687
688 in->ops.dsi->disable(in, true, false);
689
690 ddata->enabled = 0;
691}
692
693static int dsicm_panel_reset(struct panel_drv_data *ddata)
694{
695 dev_err(&ddata->pdev->dev, "performing LCD reset\n");
696
697 dsicm_power_off(ddata);
698 dsicm_hw_reset(ddata);
699 return dsicm_power_on(ddata);
700}
701
702static int dsicm_connect(struct omap_dss_device *dssdev)
703{
704 struct panel_drv_data *ddata = to_panel_data(dssdev);
705 struct omap_dss_device *in = ddata->in;
706 struct device *dev = &ddata->pdev->dev;
707 int r;
708
709 if (omapdss_device_is_connected(dssdev))
710 return 0;
711
712 r = in->ops.dsi->connect(in, dssdev);
713 if (r) {
714 dev_err(dev, "Failed to connect to video source\n");
715 return r;
716 }
717
718 r = in->ops.dsi->request_vc(ddata->in, &ddata->channel);
719 if (r) {
720 dev_err(dev, "failed to get virtual channel\n");
721 goto err_req_vc;
722 }
723
724 r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH);
725 if (r) {
726 dev_err(dev, "failed to set VC_ID\n");
727 goto err_vc_id;
728 }
729
730 return 0;
731
732err_vc_id:
733 in->ops.dsi->release_vc(ddata->in, ddata->channel);
734err_req_vc:
735 in->ops.dsi->disconnect(in, dssdev);
736 return r;
737}
738
739static void dsicm_disconnect(struct omap_dss_device *dssdev)
740{
741 struct panel_drv_data *ddata = to_panel_data(dssdev);
742 struct omap_dss_device *in = ddata->in;
743
744 if (!omapdss_device_is_connected(dssdev))
745 return;
746
747 in->ops.dsi->release_vc(in, ddata->channel);
748 in->ops.dsi->disconnect(in, dssdev);
749}
750
751static int dsicm_enable(struct omap_dss_device *dssdev)
752{
753 struct panel_drv_data *ddata = to_panel_data(dssdev);
754 struct omap_dss_device *in = ddata->in;
755 int r;
756
757 dev_dbg(&ddata->pdev->dev, "enable\n");
758
759 mutex_lock(&ddata->lock);
760
761 if (!omapdss_device_is_connected(dssdev)) {
762 r = -ENODEV;
763 goto err;
764 }
765
766 if (omapdss_device_is_enabled(dssdev)) {
767 r = 0;
768 goto err;
769 }
770
771 in->ops.dsi->bus_lock(in);
772
773 r = dsicm_power_on(ddata);
774
775 in->ops.dsi->bus_unlock(in);
776
777 if (r)
778 goto err;
779
780 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
781
782 mutex_unlock(&ddata->lock);
783
784 return 0;
785err:
786 dev_dbg(&ddata->pdev->dev, "enable failed\n");
787 mutex_unlock(&ddata->lock);
788 return r;
789}
790
791static void dsicm_disable(struct omap_dss_device *dssdev)
792{
793 struct panel_drv_data *ddata = to_panel_data(dssdev);
794 struct omap_dss_device *in = ddata->in;
795 int r;
796
797 dev_dbg(&ddata->pdev->dev, "disable\n");
798
799 mutex_lock(&ddata->lock);
800
801 dsicm_cancel_ulps_work(ddata);
802
803 in->ops.dsi->bus_lock(in);
804
805 if (omapdss_device_is_enabled(dssdev)) {
806 r = dsicm_wake_up(ddata);
807 if (!r)
808 dsicm_power_off(ddata);
809 }
810
811 in->ops.dsi->bus_unlock(in);
812
813 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
814
815 mutex_unlock(&ddata->lock);
816}
817
818static void dsicm_framedone_cb(int err, void *data)
819{
820 struct panel_drv_data *ddata = data;
821 struct omap_dss_device *in = ddata->in;
822
823 dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
824 in->ops.dsi->bus_unlock(ddata->in);
825}
826
827static irqreturn_t dsicm_te_isr(int irq, void *data)
828{
829 struct panel_drv_data *ddata = data;
830 struct omap_dss_device *in = ddata->in;
831 int old;
832 int r;
833
834 old = atomic_cmpxchg(&ddata->do_update, 1, 0);
835
836 if (old) {
837 cancel_delayed_work(&ddata->te_timeout_work);
838
839 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
840 ddata);
841 if (r)
842 goto err;
843 }
844
845 return IRQ_HANDLED;
846err:
847 dev_err(&ddata->pdev->dev, "start update failed\n");
848 in->ops.dsi->bus_unlock(in);
849 return IRQ_HANDLED;
850}
851
852static void dsicm_te_timeout_work_callback(struct work_struct *work)
853{
854 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
855 te_timeout_work.work);
856 struct omap_dss_device *in = ddata->in;
857
858 dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
859
860 atomic_set(&ddata->do_update, 0);
861 in->ops.dsi->bus_unlock(in);
862}
863
864static int dsicm_update(struct omap_dss_device *dssdev,
865 u16 x, u16 y, u16 w, u16 h)
866{
867 struct panel_drv_data *ddata = to_panel_data(dssdev);
868 struct omap_dss_device *in = ddata->in;
869 int r;
870
871 dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
872
873 mutex_lock(&ddata->lock);
874 in->ops.dsi->bus_lock(in);
875
876 r = dsicm_wake_up(ddata);
877 if (r)
878 goto err;
879
880 if (!ddata->enabled) {
881 r = 0;
882 goto err;
883 }
884
885
886 r = dsicm_set_update_window(ddata, 0, 0,
887 dssdev->panel.timings.x_res,
888 dssdev->panel.timings.y_res);
889 if (r)
890 goto err;
891
892 if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) {
893 schedule_delayed_work(&ddata->te_timeout_work,
894 msecs_to_jiffies(250));
895 atomic_set(&ddata->do_update, 1);
896 } else {
897 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
898 ddata);
899 if (r)
900 goto err;
901 }
902
903
904 mutex_unlock(&ddata->lock);
905 return 0;
906err:
907 in->ops.dsi->bus_unlock(in);
908 mutex_unlock(&ddata->lock);
909 return r;
910}
911
912static int dsicm_sync(struct omap_dss_device *dssdev)
913{
914 struct panel_drv_data *ddata = to_panel_data(dssdev);
915 struct omap_dss_device *in = ddata->in;
916
917 dev_dbg(&ddata->pdev->dev, "sync\n");
918
919 mutex_lock(&ddata->lock);
920 in->ops.dsi->bus_lock(in);
921 in->ops.dsi->bus_unlock(in);
922 mutex_unlock(&ddata->lock);
923
924 dev_dbg(&ddata->pdev->dev, "sync done\n");
925
926 return 0;
927}
928
929static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
930{
931 struct omap_dss_device *in = ddata->in;
932 int r;
933
934 if (enable)
935 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
936 else
937 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
938
939 if (!gpio_is_valid(ddata->ext_te_gpio))
940 in->ops.dsi->enable_te(in, enable);
941
942
943 msleep(100);
944
945 return r;
946}
947
948static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
949{
950 struct panel_drv_data *ddata = to_panel_data(dssdev);
951 struct omap_dss_device *in = ddata->in;
952 int r;
953
954 mutex_lock(&ddata->lock);
955
956 if (ddata->te_enabled == enable)
957 goto end;
958
959 in->ops.dsi->bus_lock(in);
960
961 if (ddata->enabled) {
962 r = dsicm_wake_up(ddata);
963 if (r)
964 goto err;
965
966 r = _dsicm_enable_te(ddata, enable);
967 if (r)
968 goto err;
969 }
970
971 ddata->te_enabled = enable;
972
973 in->ops.dsi->bus_unlock(in);
974end:
975 mutex_unlock(&ddata->lock);
976
977 return 0;
978err:
979 in->ops.dsi->bus_unlock(in);
980 mutex_unlock(&ddata->lock);
981
982 return r;
983}
984
985static int dsicm_get_te(struct omap_dss_device *dssdev)
986{
987 struct panel_drv_data *ddata = to_panel_data(dssdev);
988 int r;
989
990 mutex_lock(&ddata->lock);
991 r = ddata->te_enabled;
992 mutex_unlock(&ddata->lock);
993
994 return r;
995}
996
997static int dsicm_memory_read(struct omap_dss_device *dssdev,
998 void *buf, size_t size,
999 u16 x, u16 y, u16 w, u16 h)
1000{
1001 struct panel_drv_data *ddata = to_panel_data(dssdev);
1002 struct omap_dss_device *in = ddata->in;
1003 int r;
1004 int first = 1;
1005 int plen;
1006 unsigned buf_used = 0;
1007
1008 if (size < w * h * 3)
1009 return -ENOMEM;
1010
1011 mutex_lock(&ddata->lock);
1012
1013 if (!ddata->enabled) {
1014 r = -ENODEV;
1015 goto err1;
1016 }
1017
1018 size = min(w * h * 3,
1019 dssdev->panel.timings.x_res *
1020 dssdev->panel.timings.y_res * 3);
1021
1022 in->ops.dsi->bus_lock(in);
1023
1024 r = dsicm_wake_up(ddata);
1025 if (r)
1026 goto err2;
1027
1028
1029
1030
1031 if (size % 2)
1032 plen = 1;
1033 else
1034 plen = 2;
1035
1036 dsicm_set_update_window(ddata, x, y, w, h);
1037
1038 r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
1039 if (r)
1040 goto err2;
1041
1042 while (buf_used < size) {
1043 u8 dcs_cmd = first ? 0x2e : 0x3e;
1044 first = 0;
1045
1046 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd,
1047 buf + buf_used, size - buf_used);
1048
1049 if (r < 0) {
1050 dev_err(dssdev->dev, "read error\n");
1051 goto err3;
1052 }
1053
1054 buf_used += r;
1055
1056 if (r < plen) {
1057 dev_err(&ddata->pdev->dev, "short read\n");
1058 break;
1059 }
1060
1061 if (signal_pending(current)) {
1062 dev_err(&ddata->pdev->dev, "signal pending, "
1063 "aborting memory read\n");
1064 r = -ERESTARTSYS;
1065 goto err3;
1066 }
1067 }
1068
1069 r = buf_used;
1070
1071err3:
1072 in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
1073err2:
1074 in->ops.dsi->bus_unlock(in);
1075err1:
1076 mutex_unlock(&ddata->lock);
1077 return r;
1078}
1079
1080static void dsicm_ulps_work(struct work_struct *work)
1081{
1082 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
1083 ulps_work.work);
1084 struct omap_dss_device *dssdev = &ddata->dssdev;
1085 struct omap_dss_device *in = ddata->in;
1086
1087 mutex_lock(&ddata->lock);
1088
1089 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
1090 mutex_unlock(&ddata->lock);
1091 return;
1092 }
1093
1094 in->ops.dsi->bus_lock(in);
1095
1096 dsicm_enter_ulps(ddata);
1097
1098 in->ops.dsi->bus_unlock(in);
1099 mutex_unlock(&ddata->lock);
1100}
1101
1102static struct omap_dss_driver dsicm_ops = {
1103 .connect = dsicm_connect,
1104 .disconnect = dsicm_disconnect,
1105
1106 .enable = dsicm_enable,
1107 .disable = dsicm_disable,
1108
1109 .update = dsicm_update,
1110 .sync = dsicm_sync,
1111
1112 .get_resolution = dsicm_get_resolution,
1113 .get_recommended_bpp = omapdss_default_get_recommended_bpp,
1114
1115 .enable_te = dsicm_enable_te,
1116 .get_te = dsicm_get_te,
1117
1118 .memory_read = dsicm_memory_read,
1119};
1120
1121static int dsicm_probe_of(struct platform_device *pdev)
1122{
1123 struct device_node *node = pdev->dev.of_node;
1124 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1125 struct omap_dss_device *in;
1126 int gpio;
1127
1128 gpio = of_get_named_gpio(node, "reset-gpios", 0);
1129 if (!gpio_is_valid(gpio)) {
1130 dev_err(&pdev->dev, "failed to parse reset gpio\n");
1131 return gpio;
1132 }
1133 ddata->reset_gpio = gpio;
1134
1135 gpio = of_get_named_gpio(node, "te-gpios", 0);
1136 if (gpio_is_valid(gpio) || gpio == -ENOENT) {
1137 ddata->ext_te_gpio = gpio;
1138 } else {
1139 dev_err(&pdev->dev, "failed to parse TE gpio\n");
1140 return gpio;
1141 }
1142
1143 in = omapdss_of_find_source_for_first_ep(node);
1144 if (IS_ERR(in)) {
1145 dev_err(&pdev->dev, "failed to find video source\n");
1146 return PTR_ERR(in);
1147 }
1148
1149 ddata->in = in;
1150
1151
1152
1153 return 0;
1154}
1155
1156static int dsicm_probe(struct platform_device *pdev)
1157{
1158 struct backlight_properties props;
1159 struct panel_drv_data *ddata;
1160 struct backlight_device *bldev = NULL;
1161 struct device *dev = &pdev->dev;
1162 struct omap_dss_device *dssdev;
1163 int r;
1164
1165 dev_dbg(dev, "probe\n");
1166
1167 if (!pdev->dev.of_node)
1168 return -ENODEV;
1169
1170 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
1171 if (!ddata)
1172 return -ENOMEM;
1173
1174 platform_set_drvdata(pdev, ddata);
1175 ddata->pdev = pdev;
1176
1177 r = dsicm_probe_of(pdev);
1178 if (r)
1179 return r;
1180
1181 ddata->timings.x_res = 864;
1182 ddata->timings.y_res = 480;
1183 ddata->timings.pixelclock = 864 * 480 * 60;
1184
1185 dssdev = &ddata->dssdev;
1186 dssdev->dev = dev;
1187 dssdev->driver = &dsicm_ops;
1188 dssdev->panel.timings = ddata->timings;
1189 dssdev->type = OMAP_DISPLAY_TYPE_DSI;
1190 dssdev->owner = THIS_MODULE;
1191
1192 dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
1193 dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
1194 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
1195
1196 r = omapdss_register_display(dssdev);
1197 if (r) {
1198 dev_err(dev, "Failed to register panel\n");
1199 goto err_reg;
1200 }
1201
1202 mutex_init(&ddata->lock);
1203
1204 atomic_set(&ddata->do_update, 0);
1205
1206 if (gpio_is_valid(ddata->reset_gpio)) {
1207 r = devm_gpio_request_one(dev, ddata->reset_gpio,
1208 GPIOF_OUT_INIT_LOW, "taal rst");
1209 if (r) {
1210 dev_err(dev, "failed to request reset gpio\n");
1211 return r;
1212 }
1213 }
1214
1215 if (gpio_is_valid(ddata->ext_te_gpio)) {
1216 r = devm_gpio_request_one(dev, ddata->ext_te_gpio,
1217 GPIOF_IN, "taal irq");
1218 if (r) {
1219 dev_err(dev, "GPIO request failed\n");
1220 return r;
1221 }
1222
1223 r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio),
1224 dsicm_te_isr,
1225 IRQF_TRIGGER_RISING,
1226 "taal vsync", ddata);
1227
1228 if (r) {
1229 dev_err(dev, "IRQ request failed\n");
1230 return r;
1231 }
1232
1233 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
1234 dsicm_te_timeout_work_callback);
1235
1236 dev_dbg(dev, "Using GPIO TE\n");
1237 }
1238
1239 INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
1240
1241 dsicm_hw_reset(ddata);
1242
1243 if (ddata->use_dsi_backlight) {
1244 memset(&props, 0, sizeof(struct backlight_properties));
1245 props.max_brightness = 255;
1246
1247 props.type = BACKLIGHT_RAW;
1248 bldev = backlight_device_register(dev_name(dev),
1249 dev, ddata, &dsicm_bl_ops, &props);
1250 if (IS_ERR(bldev)) {
1251 r = PTR_ERR(bldev);
1252 goto err_reg;
1253 }
1254
1255 ddata->bldev = bldev;
1256
1257 bldev->props.fb_blank = FB_BLANK_UNBLANK;
1258 bldev->props.power = FB_BLANK_UNBLANK;
1259 bldev->props.brightness = 255;
1260
1261 dsicm_bl_update_status(bldev);
1262 }
1263
1264 r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
1265 if (r) {
1266 dev_err(dev, "failed to create sysfs files\n");
1267 goto err_sysfs_create;
1268 }
1269
1270 return 0;
1271
1272err_sysfs_create:
1273 if (bldev != NULL)
1274 backlight_device_unregister(bldev);
1275err_reg:
1276 return r;
1277}
1278
1279static int __exit dsicm_remove(struct platform_device *pdev)
1280{
1281 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1282 struct omap_dss_device *dssdev = &ddata->dssdev;
1283 struct backlight_device *bldev;
1284
1285 dev_dbg(&pdev->dev, "remove\n");
1286
1287 omapdss_unregister_display(dssdev);
1288
1289 dsicm_disable(dssdev);
1290 dsicm_disconnect(dssdev);
1291
1292 sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
1293
1294 bldev = ddata->bldev;
1295 if (bldev != NULL) {
1296 bldev->props.power = FB_BLANK_POWERDOWN;
1297 dsicm_bl_update_status(bldev);
1298 backlight_device_unregister(bldev);
1299 }
1300
1301 omap_dss_put_device(ddata->in);
1302
1303 dsicm_cancel_ulps_work(ddata);
1304
1305
1306 dsicm_hw_reset(ddata);
1307
1308 return 0;
1309}
1310
1311static const struct of_device_id dsicm_of_match[] = {
1312 { .compatible = "omapdss,panel-dsi-cm", },
1313 {},
1314};
1315
1316MODULE_DEVICE_TABLE(of, dsicm_of_match);
1317
1318static struct platform_driver dsicm_driver = {
1319 .probe = dsicm_probe,
1320 .remove = __exit_p(dsicm_remove),
1321 .driver = {
1322 .name = "panel-dsi-cm",
1323 .of_match_table = dsicm_of_match,
1324 .suppress_bind_attrs = true,
1325 },
1326};
1327
1328module_platform_driver(dsicm_driver);
1329
1330MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
1331MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
1332MODULE_LICENSE("GPL");
1333
