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1/*
2 * Generic DSI Command Mode panel driver
3 *
4 * Copyright (C) 2013 Texas Instruments
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published by
9 * the Free Software Foundation.
10 */
11
12/* #define DEBUG */
13
14#include <linux/backlight.h>
15#include <linux/delay.h>
16#include <linux/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.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/omapdss.h>
29#include <video/omap-panel-data.h>
30#include <video/mipi_display.h>
31
32/* DSI Virtual channel. Hardcoded for now. */
33#define TCH 0
34
35#define DCS_READ_NUM_ERRORS 0x05
36#define DCS_BRIGHTNESS 0x51
37#define DCS_CTRL_DISPLAY 0x53
38#define DCS_GET_ID1 0xda
39#define DCS_GET_ID2 0xdb
40#define DCS_GET_ID3 0xdc
41
42struct panel_drv_data {
43 struct omap_dss_device dssdev;
44 struct omap_dss_device *in;
45
46 struct omap_video_timings timings;
47
48 struct platform_device *pdev;
49
50 struct mutex lock;
51
52 struct backlight_device *bldev;
53
54 unsigned long hw_guard_end; /* next value of jiffies when we can
55 * issue the next sleep in/out command
56 */
57 unsigned long hw_guard_wait; /* max guard time in jiffies */
58
59 /* panel HW configuration from DT or platform data */
60 int reset_gpio;
61 int ext_te_gpio;
62
63 bool use_dsi_backlight;
64
65 struct omap_dsi_pin_config pin_config;
66
67 /* runtime variables */
68 bool enabled;
69
70 bool te_enabled;
71
72 atomic_t do_update;
73 int channel;
74
75 struct delayed_work te_timeout_work;
76
77 bool intro_printed;
78
79 struct workqueue_struct *workqueue;
80
81 bool ulps_enabled;
82 unsigned ulps_timeout;
83 struct delayed_work ulps_work;
84};
85
86#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
87
88static irqreturn_t dsicm_te_isr(int irq, void *data);
89static void dsicm_te_timeout_work_callback(struct work_struct *work);
90static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
91
92static int dsicm_panel_reset(struct panel_drv_data *ddata);
93
94static void dsicm_ulps_work(struct work_struct *work);
95
96static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
97{
98 ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
99 ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
100}
101
102static void hw_guard_wait(struct panel_drv_data *ddata)
103{
104 unsigned long wait = ddata->hw_guard_end - jiffies;
105
106 if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
107 set_current_state(TASK_UNINTERRUPTIBLE);
108 schedule_timeout(wait);
109 }
110}
111
112static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
113{
114 struct omap_dss_device *in = ddata->in;
115 int r;
116 u8 buf[1];
117
118 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1);
119
120 if (r < 0)
121 return r;
122
123 *data = buf[0];
124
125 return 0;
126}
127
128static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
129{
130 struct omap_dss_device *in = ddata->in;
131 return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1);
132}
133
134static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
135{
136 struct omap_dss_device *in = ddata->in;
137 u8 buf[2] = { dcs_cmd, param };
138
139 return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
140}
141
142static int dsicm_sleep_in(struct panel_drv_data *ddata)
143
144{
145 struct omap_dss_device *in = ddata->in;
146 u8 cmd;
147 int r;
148
149 hw_guard_wait(ddata);
150
151 cmd = MIPI_DCS_ENTER_SLEEP_MODE;
152 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1);
153 if (r)
154 return r;
155
156 hw_guard_start(ddata, 120);
157
158 usleep_range(5000, 10000);
159
160 return 0;
161}
162
163static int dsicm_sleep_out(struct panel_drv_data *ddata)
164{
165 int r;
166
167 hw_guard_wait(ddata);
168
169 r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
170 if (r)
171 return r;
172
173 hw_guard_start(ddata, 120);
174
175 usleep_range(5000, 10000);
176
177 return 0;
178}
179
180static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
181{
182 int r;
183
184 r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
185 if (r)
186 return r;
187 r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
188 if (r)
189 return r;
190 r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
191 if (r)
192 return r;
193
194 return 0;
195}
196
197static int dsicm_set_update_window(struct panel_drv_data *ddata,
198 u16 x, u16 y, u16 w, u16 h)
199{
200 struct omap_dss_device *in = ddata->in;
201 int r;
202 u16 x1 = x;
203 u16 x2 = x + w - 1;
204 u16 y1 = y;
205 u16 y2 = y + h - 1;
206
207 u8 buf[5];
208 buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
209 buf[1] = (x1 >> 8) & 0xff;
210 buf[2] = (x1 >> 0) & 0xff;
211 buf[3] = (x2 >> 8) & 0xff;
212 buf[4] = (x2 >> 0) & 0xff;
213
214 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
215 if (r)
216 return r;
217
218 buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
219 buf[1] = (y1 >> 8) & 0xff;
220 buf[2] = (y1 >> 0) & 0xff;
221 buf[3] = (y2 >> 8) & 0xff;
222 buf[4] = (y2 >> 0) & 0xff;
223
224 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
225 if (r)
226 return r;
227
228 in->ops.dsi->bta_sync(in, ddata->channel);
229
230 return r;
231}
232
233static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
234{
235 if (ddata->ulps_timeout > 0)
236 queue_delayed_work(ddata->workqueue, &ddata->ulps_work,
237 msecs_to_jiffies(ddata->ulps_timeout));
238}
239
240static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
241{
242 cancel_delayed_work(&ddata->ulps_work);
243}
244
245static int dsicm_enter_ulps(struct panel_drv_data *ddata)
246{
247 struct omap_dss_device *in = ddata->in;
248 int r;
249
250 if (ddata->ulps_enabled)
251 return 0;
252
253 dsicm_cancel_ulps_work(ddata);
254
255 r = _dsicm_enable_te(ddata, false);
256 if (r)
257 goto err;
258
259 if (gpio_is_valid(ddata->ext_te_gpio))
260 disable_irq(gpio_to_irq(ddata->ext_te_gpio));
261
262 in->ops.dsi->disable(in, false, true);
263
264 ddata->ulps_enabled = true;
265
266 return 0;
267
268err:
269 dev_err(&ddata->pdev->dev, "enter ULPS failed");
270 dsicm_panel_reset(ddata);
271
272 ddata->ulps_enabled = false;
273
274 dsicm_queue_ulps_work(ddata);
275
276 return r;
277}
278
279static int dsicm_exit_ulps(struct panel_drv_data *ddata)
280{
281 struct omap_dss_device *in = ddata->in;
282 int r;
283
284 if (!ddata->ulps_enabled)
285 return 0;
286
287 r = in->ops.dsi->enable(in);
288 if (r) {
289 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
290 goto err1;
291 }
292
293 in->ops.dsi->enable_hs(in, ddata->channel, true);
294
295 r = _dsicm_enable_te(ddata, true);
296 if (r) {
297 dev_err(&ddata->pdev->dev, "failed to re-enable TE");
298 goto err2;
299 }
300
301 if (gpio_is_valid(ddata->ext_te_gpio))
302 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
303
304 dsicm_queue_ulps_work(ddata);
305
306 ddata->ulps_enabled = false;
307
308 return 0;
309
310err2:
311 dev_err(&ddata->pdev->dev, "failed to exit ULPS");
312
313 r = dsicm_panel_reset(ddata);
314 if (!r) {
315 if (gpio_is_valid(ddata->ext_te_gpio))
316 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
317 ddata->ulps_enabled = false;
318 }
319err1:
320 dsicm_queue_ulps_work(ddata);
321
322 return r;
323}
324
325static int dsicm_wake_up(struct panel_drv_data *ddata)
326{
327 if (ddata->ulps_enabled)
328 return dsicm_exit_ulps(ddata);
329
330 dsicm_cancel_ulps_work(ddata);
331 dsicm_queue_ulps_work(ddata);
332 return 0;
333}
334
335static int dsicm_bl_update_status(struct backlight_device *dev)
336{
337 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
338 struct omap_dss_device *in = ddata->in;
339 int r;
340 int level;
341
342 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
343 dev->props.power == FB_BLANK_UNBLANK)
344 level = dev->props.brightness;
345 else
346 level = 0;
347
348 dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
349
350 mutex_lock(&ddata->lock);
351
352 if (ddata->enabled) {
353 in->ops.dsi->bus_lock(in);
354
355 r = dsicm_wake_up(ddata);
356 if (!r)
357 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
358
359 in->ops.dsi->bus_unlock(in);
360 } else {
361 r = 0;
362 }
363
364 mutex_unlock(&ddata->lock);
365
366 return r;
367}
368
369static int dsicm_bl_get_intensity(struct backlight_device *dev)
370{
371 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
372 dev->props.power == FB_BLANK_UNBLANK)
373 return dev->props.brightness;
374
375 return 0;
376}
377
378static const struct backlight_ops dsicm_bl_ops = {
379 .get_brightness = dsicm_bl_get_intensity,
380 .update_status = dsicm_bl_update_status,
381};
382
383static void dsicm_get_resolution(struct omap_dss_device *dssdev,
384 u16 *xres, u16 *yres)
385{
386 *xres = dssdev->panel.timings.x_res;
387 *yres = dssdev->panel.timings.y_res;
388}
389
390static ssize_t dsicm_num_errors_show(struct device *dev,
391 struct device_attribute *attr, char *buf)
392{
393 struct platform_device *pdev = to_platform_device(dev);
394 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
395 struct omap_dss_device *in = ddata->in;
396 u8 errors = 0;
397 int r;
398
399 mutex_lock(&ddata->lock);
400
401 if (ddata->enabled) {
402 in->ops.dsi->bus_lock(in);
403
404 r = dsicm_wake_up(ddata);
405 if (!r)
406 r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
407 &errors);
408
409 in->ops.dsi->bus_unlock(in);
410 } else {
411 r = -ENODEV;
412 }
413
414 mutex_unlock(&ddata->lock);
415
416 if (r)
417 return r;
418
419 return snprintf(buf, PAGE_SIZE, "%d\n", errors);
420}
421
422static ssize_t dsicm_hw_revision_show(struct device *dev,
423 struct device_attribute *attr, char *buf)
424{
425 struct platform_device *pdev = to_platform_device(dev);
426 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
427 struct omap_dss_device *in = ddata->in;
428 u8 id1, id2, id3;
429 int r;
430
431 mutex_lock(&ddata->lock);
432
433 if (ddata->enabled) {
434 in->ops.dsi->bus_lock(in);
435
436 r = dsicm_wake_up(ddata);
437 if (!r)
438 r = dsicm_get_id(ddata, &id1, &id2, &id3);
439
440 in->ops.dsi->bus_unlock(in);
441 } else {
442 r = -ENODEV;
443 }
444
445 mutex_unlock(&ddata->lock);
446
447 if (r)
448 return r;
449
450 return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
451}
452
453static ssize_t dsicm_store_ulps(struct device *dev,
454 struct device_attribute *attr,
455 const char *buf, size_t count)
456{
457 struct platform_device *pdev = to_platform_device(dev);
458 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
459 struct omap_dss_device *in = ddata->in;
460 unsigned long t;
461 int r;
462
463 r = kstrtoul(buf, 0, &t);
464 if (r)
465 return r;
466
467 mutex_lock(&ddata->lock);
468
469 if (ddata->enabled) {
470 in->ops.dsi->bus_lock(in);
471
472 if (t)
473 r = dsicm_enter_ulps(ddata);
474 else
475 r = dsicm_wake_up(ddata);
476
477 in->ops.dsi->bus_unlock(in);
478 }
479
480 mutex_unlock(&ddata->lock);
481
482 if (r)
483 return r;
484
485 return count;
486}
487
488static ssize_t dsicm_show_ulps(struct device *dev,
489 struct device_attribute *attr,
490 char *buf)
491{
492 struct platform_device *pdev = to_platform_device(dev);
493 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
494 unsigned t;
495
496 mutex_lock(&ddata->lock);
497 t = ddata->ulps_enabled;
498 mutex_unlock(&ddata->lock);
499
500 return snprintf(buf, PAGE_SIZE, "%u\n", t);
501}
502
503static ssize_t dsicm_store_ulps_timeout(struct device *dev,
504 struct device_attribute *attr,
505 const char *buf, size_t count)
506{
507 struct platform_device *pdev = to_platform_device(dev);
508 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
509 struct omap_dss_device *in = ddata->in;
510 unsigned long t;
511 int r;
512
513 r = kstrtoul(buf, 0, &t);
514 if (r)
515 return r;
516
517 mutex_lock(&ddata->lock);
518 ddata->ulps_timeout = t;
519
520 if (ddata->enabled) {
521 /* dsicm_wake_up will restart the timer */
522 in->ops.dsi->bus_lock(in);
523 r = dsicm_wake_up(ddata);
524 in->ops.dsi->bus_unlock(in);
525 }
526
527 mutex_unlock(&ddata->lock);
528
529 if (r)
530 return r;
531
532 return count;
533}
534
535static ssize_t dsicm_show_ulps_timeout(struct device *dev,
536 struct device_attribute *attr,
537 char *buf)
538{
539 struct platform_device *pdev = to_platform_device(dev);
540 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
541 unsigned t;
542
543 mutex_lock(&ddata->lock);
544 t = ddata->ulps_timeout;
545 mutex_unlock(&ddata->lock);
546
547 return snprintf(buf, PAGE_SIZE, "%u\n", t);
548}
549
550static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
551static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
552static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
553 dsicm_show_ulps, dsicm_store_ulps);
554static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
555 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
556
557static struct attribute *dsicm_attrs[] = {
558 &dev_attr_num_dsi_errors.attr,
559 &dev_attr_hw_revision.attr,
560 &dev_attr_ulps.attr,
561 &dev_attr_ulps_timeout.attr,
562 NULL,
563};
564
565static struct attribute_group dsicm_attr_group = {
566 .attrs = dsicm_attrs,
567};
568
569static void dsicm_hw_reset(struct panel_drv_data *ddata)
570{
571 if (!gpio_is_valid(ddata->reset_gpio))
572 return;
573
574 gpio_set_value(ddata->reset_gpio, 1);
575 udelay(10);
576 /* reset the panel */
577 gpio_set_value(ddata->reset_gpio, 0);
578 /* assert reset */
579 udelay(10);
580 gpio_set_value(ddata->reset_gpio, 1);
581 /* wait after releasing reset */
582 usleep_range(5000, 10000);
583}
584
585static int dsicm_power_on(struct panel_drv_data *ddata)
586{
587 struct omap_dss_device *in = ddata->in;
588 u8 id1, id2, id3;
589 int r;
590 struct omap_dss_dsi_config dsi_config = {
591 .mode = OMAP_DSS_DSI_CMD_MODE,
592 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
593 .timings = &ddata->timings,
594 .hs_clk_min = 150000000,
595 .hs_clk_max = 300000000,
596 .lp_clk_min = 7000000,
597 .lp_clk_max = 10000000,
598 };
599
600 if (ddata->pin_config.num_pins > 0) {
601 r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
602 if (r) {
603 dev_err(&ddata->pdev->dev,
604 "failed to configure DSI pins\n");
605 goto err0;
606 }
607 }
608
609 r = in->ops.dsi->set_config(in, &dsi_config);
610 if (r) {
611 dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
612 goto err0;
613 }
614
615 r = in->ops.dsi->enable(in);
616 if (r) {
617 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
618 goto err0;
619 }
620
621 dsicm_hw_reset(ddata);
622
623 in->ops.dsi->enable_hs(in, ddata->channel, false);
624
625 r = dsicm_sleep_out(ddata);
626 if (r)
627 goto err;
628
629 r = dsicm_get_id(ddata, &id1, &id2, &id3);
630 if (r)
631 goto err;
632
633 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
634 if (r)
635 goto err;
636
637 r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
638 (1<<2) | (1<<5)); /* BL | BCTRL */
639 if (r)
640 goto err;
641
642 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
643 MIPI_DCS_PIXEL_FMT_24BIT);
644 if (r)
645 goto err;
646
647 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
648 if (r)
649 goto err;
650
651 r = _dsicm_enable_te(ddata, ddata->te_enabled);
652 if (r)
653 goto err;
654
655 r = in->ops.dsi->enable_video_output(in, ddata->channel);
656 if (r)
657 goto err;
658
659 ddata->enabled = 1;
660
661 if (!ddata->intro_printed) {
662 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
663 id1, id2, id3);
664 ddata->intro_printed = true;
665 }
666
667 in->ops.dsi->enable_hs(in, ddata->channel, true);
668
669 return 0;
670err:
671 dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
672
673 dsicm_hw_reset(ddata);
674
675 in->ops.dsi->disable(in, true, false);
676err0:
677 return r;
678}
679
680static void dsicm_power_off(struct panel_drv_data *ddata)
681{
682 struct omap_dss_device *in = ddata->in;
683 int r;
684
685 in->ops.dsi->disable_video_output(in, ddata->channel);
686
687 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
688 if (!r)
689 r = dsicm_sleep_in(ddata);
690
691 if (r) {
692 dev_err(&ddata->pdev->dev,
693 "error disabling panel, issuing HW reset\n");
694 dsicm_hw_reset(ddata);
695 }
696
697 in->ops.dsi->disable(in, true, false);
698
699 ddata->enabled = 0;
700}
701
702static int dsicm_panel_reset(struct panel_drv_data *ddata)
703{
704 dev_err(&ddata->pdev->dev, "performing LCD reset\n");
705
706 dsicm_power_off(ddata);
707 dsicm_hw_reset(ddata);
708 return dsicm_power_on(ddata);
709}
710
711static int dsicm_connect(struct omap_dss_device *dssdev)
712{
713 struct panel_drv_data *ddata = to_panel_data(dssdev);
714 struct omap_dss_device *in = ddata->in;
715 struct device *dev = &ddata->pdev->dev;
716 int r;
717
718 if (omapdss_device_is_connected(dssdev))
719 return 0;
720
721 r = in->ops.dsi->connect(in, dssdev);
722 if (r) {
723 dev_err(dev, "Failed to connect to video source\n");
724 return r;
725 }
726
727 r = in->ops.dsi->request_vc(ddata->in, &ddata->channel);
728 if (r) {
729 dev_err(dev, "failed to get virtual channel\n");
730 goto err_req_vc;
731 }
732
733 r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH);
734 if (r) {
735 dev_err(dev, "failed to set VC_ID\n");
736 goto err_vc_id;
737 }
738
739 return 0;
740
741err_vc_id:
742 in->ops.dsi->release_vc(ddata->in, ddata->channel);
743err_req_vc:
744 in->ops.dsi->disconnect(in, dssdev);
745 return r;
746}
747
748static void dsicm_disconnect(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
753 if (!omapdss_device_is_connected(dssdev))
754 return;
755
756 in->ops.dsi->release_vc(in, ddata->channel);
757 in->ops.dsi->disconnect(in, dssdev);
758}
759
760static int dsicm_enable(struct omap_dss_device *dssdev)
761{
762 struct panel_drv_data *ddata = to_panel_data(dssdev);
763 struct omap_dss_device *in = ddata->in;
764 int r;
765
766 dev_dbg(&ddata->pdev->dev, "enable\n");
767
768 mutex_lock(&ddata->lock);
769
770 if (!omapdss_device_is_connected(dssdev)) {
771 r = -ENODEV;
772 goto err;
773 }
774
775 if (omapdss_device_is_enabled(dssdev)) {
776 r = 0;
777 goto err;
778 }
779
780 in->ops.dsi->bus_lock(in);
781
782 r = dsicm_power_on(ddata);
783
784 in->ops.dsi->bus_unlock(in);
785
786 if (r)
787 goto err;
788
789 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
790
791 mutex_unlock(&ddata->lock);
792
793 return 0;
794err:
795 dev_dbg(&ddata->pdev->dev, "enable failed\n");
796 mutex_unlock(&ddata->lock);
797 return r;
798}
799
800static void dsicm_disable(struct omap_dss_device *dssdev)
801{
802 struct panel_drv_data *ddata = to_panel_data(dssdev);
803 struct omap_dss_device *in = ddata->in;
804 int r;
805
806 dev_dbg(&ddata->pdev->dev, "disable\n");
807
808 mutex_lock(&ddata->lock);
809
810 dsicm_cancel_ulps_work(ddata);
811
812 in->ops.dsi->bus_lock(in);
813
814 if (omapdss_device_is_enabled(dssdev)) {
815 r = dsicm_wake_up(ddata);
816 if (!r)
817 dsicm_power_off(ddata);
818 }
819
820 in->ops.dsi->bus_unlock(in);
821
822 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
823
824 mutex_unlock(&ddata->lock);
825}
826
827static void dsicm_framedone_cb(int err, void *data)
828{
829 struct panel_drv_data *ddata = data;
830 struct omap_dss_device *in = ddata->in;
831
832 dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
833 in->ops.dsi->bus_unlock(ddata->in);
834}
835
836static irqreturn_t dsicm_te_isr(int irq, void *data)
837{
838 struct panel_drv_data *ddata = data;
839 struct omap_dss_device *in = ddata->in;
840 int old;
841 int r;
842
843 old = atomic_cmpxchg(&ddata->do_update, 1, 0);
844
845 if (old) {
846 cancel_delayed_work(&ddata->te_timeout_work);
847
848 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
849 ddata);
850 if (r)
851 goto err;
852 }
853
854 return IRQ_HANDLED;
855err:
856 dev_err(&ddata->pdev->dev, "start update failed\n");
857 in->ops.dsi->bus_unlock(in);
858 return IRQ_HANDLED;
859}
860
861static void dsicm_te_timeout_work_callback(struct work_struct *work)
862{
863 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
864 te_timeout_work.work);
865 struct omap_dss_device *in = ddata->in;
866
867 dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
868
869 atomic_set(&ddata->do_update, 0);
870 in->ops.dsi->bus_unlock(in);
871}
872
873static int dsicm_update(struct omap_dss_device *dssdev,
874 u16 x, u16 y, u16 w, u16 h)
875{
876 struct panel_drv_data *ddata = to_panel_data(dssdev);
877 struct omap_dss_device *in = ddata->in;
878 int r;
879
880 dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
881
882 mutex_lock(&ddata->lock);
883 in->ops.dsi->bus_lock(in);
884
885 r = dsicm_wake_up(ddata);
886 if (r)
887 goto err;
888
889 if (!ddata->enabled) {
890 r = 0;
891 goto err;
892 }
893
894 /* XXX no need to send this every frame, but dsi break if not done */
895 r = dsicm_set_update_window(ddata, 0, 0,
896 dssdev->panel.timings.x_res,
897 dssdev->panel.timings.y_res);
898 if (r)
899 goto err;
900
901 if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) {
902 schedule_delayed_work(&ddata->te_timeout_work,
903 msecs_to_jiffies(250));
904 atomic_set(&ddata->do_update, 1);
905 } else {
906 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
907 ddata);
908 if (r)
909 goto err;
910 }
911
912 /* note: no bus_unlock here. unlock is in framedone_cb */
913 mutex_unlock(&ddata->lock);
914 return 0;
915err:
916 in->ops.dsi->bus_unlock(in);
917 mutex_unlock(&ddata->lock);
918 return r;
919}
920
921static int dsicm_sync(struct omap_dss_device *dssdev)
922{
923 struct panel_drv_data *ddata = to_panel_data(dssdev);
924 struct omap_dss_device *in = ddata->in;
925
926 dev_dbg(&ddata->pdev->dev, "sync\n");
927
928 mutex_lock(&ddata->lock);
929 in->ops.dsi->bus_lock(in);
930 in->ops.dsi->bus_unlock(in);
931 mutex_unlock(&ddata->lock);
932
933 dev_dbg(&ddata->pdev->dev, "sync done\n");
934
935 return 0;
936}
937
938static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
939{
940 struct omap_dss_device *in = ddata->in;
941 int r;
942
943 if (enable)
944 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
945 else
946 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
947
948 if (!gpio_is_valid(ddata->ext_te_gpio))
949 in->ops.dsi->enable_te(in, enable);
950
951 /* possible panel bug */
952 msleep(100);
953
954 return r;
955}
956
957static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
958{
959 struct panel_drv_data *ddata = to_panel_data(dssdev);
960 struct omap_dss_device *in = ddata->in;
961 int r;
962
963 mutex_lock(&ddata->lock);
964
965 if (ddata->te_enabled == enable)
966 goto end;
967
968 in->ops.dsi->bus_lock(in);
969
970 if (ddata->enabled) {
971 r = dsicm_wake_up(ddata);
972 if (r)
973 goto err;
974
975 r = _dsicm_enable_te(ddata, enable);
976 if (r)
977 goto err;
978 }
979
980 ddata->te_enabled = enable;
981
982 in->ops.dsi->bus_unlock(in);
983end:
984 mutex_unlock(&ddata->lock);
985
986 return 0;
987err:
988 in->ops.dsi->bus_unlock(in);
989 mutex_unlock(&ddata->lock);
990
991 return r;
992}
993
994static int dsicm_get_te(struct omap_dss_device *dssdev)
995{
996 struct panel_drv_data *ddata = to_panel_data(dssdev);
997 int r;
998
999 mutex_lock(&ddata->lock);
1000 r = ddata->te_enabled;
1001 mutex_unlock(&ddata->lock);
1002
1003 return r;
1004}
1005
1006static int dsicm_memory_read(struct omap_dss_device *dssdev,
1007 void *buf, size_t size,
1008 u16 x, u16 y, u16 w, u16 h)
1009{
1010 struct panel_drv_data *ddata = to_panel_data(dssdev);
1011 struct omap_dss_device *in = ddata->in;
1012 int r;
1013 int first = 1;
1014 int plen;
1015 unsigned buf_used = 0;
1016
1017 if (size < w * h * 3)
1018 return -ENOMEM;
1019
1020 mutex_lock(&ddata->lock);
1021
1022 if (!ddata->enabled) {
1023 r = -ENODEV;
1024 goto err1;
1025 }
1026
1027 size = min(w * h * 3,
1028 dssdev->panel.timings.x_res *
1029 dssdev->panel.timings.y_res * 3);
1030
1031 in->ops.dsi->bus_lock(in);
1032
1033 r = dsicm_wake_up(ddata);
1034 if (r)
1035 goto err2;
1036
1037 /* plen 1 or 2 goes into short packet. until checksum error is fixed,
1038 * use short packets. plen 32 works, but bigger packets seem to cause
1039 * an error. */
1040 if (size % 2)
1041 plen = 1;
1042 else
1043 plen = 2;
1044
1045 dsicm_set_update_window(ddata, x, y, w, h);
1046
1047 r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
1048 if (r)
1049 goto err2;
1050
1051 while (buf_used < size) {
1052 u8 dcs_cmd = first ? 0x2e : 0x3e;
1053 first = 0;
1054
1055 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd,
1056 buf + buf_used, size - buf_used);
1057
1058 if (r < 0) {
1059 dev_err(dssdev->dev, "read error\n");
1060 goto err3;
1061 }
1062
1063 buf_used += r;
1064
1065 if (r < plen) {
1066 dev_err(&ddata->pdev->dev, "short read\n");
1067 break;
1068 }
1069
1070 if (signal_pending(current)) {
1071 dev_err(&ddata->pdev->dev, "signal pending, "
1072 "aborting memory read\n");
1073 r = -ERESTARTSYS;
1074 goto err3;
1075 }
1076 }
1077
1078 r = buf_used;
1079
1080err3:
1081 in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
1082err2:
1083 in->ops.dsi->bus_unlock(in);
1084err1:
1085 mutex_unlock(&ddata->lock);
1086 return r;
1087}
1088
1089static void dsicm_ulps_work(struct work_struct *work)
1090{
1091 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
1092 ulps_work.work);
1093 struct omap_dss_device *dssdev = &ddata->dssdev;
1094 struct omap_dss_device *in = ddata->in;
1095
1096 mutex_lock(&ddata->lock);
1097
1098 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
1099 mutex_unlock(&ddata->lock);
1100 return;
1101 }
1102
1103 in->ops.dsi->bus_lock(in);
1104
1105 dsicm_enter_ulps(ddata);
1106
1107 in->ops.dsi->bus_unlock(in);
1108 mutex_unlock(&ddata->lock);
1109}
1110
1111static struct omap_dss_driver dsicm_ops = {
1112 .connect = dsicm_connect,
1113 .disconnect = dsicm_disconnect,
1114
1115 .enable = dsicm_enable,
1116 .disable = dsicm_disable,
1117
1118 .update = dsicm_update,
1119 .sync = dsicm_sync,
1120
1121 .get_resolution = dsicm_get_resolution,
1122 .get_recommended_bpp = omapdss_default_get_recommended_bpp,
1123
1124 .enable_te = dsicm_enable_te,
1125 .get_te = dsicm_get_te,
1126
1127 .memory_read = dsicm_memory_read,
1128};
1129
1130static int dsicm_probe_of(struct platform_device *pdev)
1131{
1132 struct device_node *node = pdev->dev.of_node;
1133 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1134 struct omap_dss_device *in;
1135 int gpio;
1136
1137 gpio = of_get_named_gpio(node, "reset-gpios", 0);
1138 if (!gpio_is_valid(gpio)) {
1139 dev_err(&pdev->dev, "failed to parse reset gpio\n");
1140 return gpio;
1141 }
1142 ddata->reset_gpio = gpio;
1143
1144 gpio = of_get_named_gpio(node, "te-gpios", 0);
1145 if (gpio_is_valid(gpio) || gpio == -ENOENT) {
1146 ddata->ext_te_gpio = gpio;
1147 } else {
1148 dev_err(&pdev->dev, "failed to parse TE gpio\n");
1149 return gpio;
1150 }
1151
1152 in = omapdss_of_find_source_for_first_ep(node);
1153 if (IS_ERR(in)) {
1154 dev_err(&pdev->dev, "failed to find video source\n");
1155 return PTR_ERR(in);
1156 }
1157
1158 ddata->in = in;
1159
1160 /* TODO: ulps, backlight */
1161
1162 return 0;
1163}
1164
1165static int dsicm_probe(struct platform_device *pdev)
1166{
1167 struct backlight_properties props;
1168 struct panel_drv_data *ddata;
1169 struct backlight_device *bldev = NULL;
1170 struct device *dev = &pdev->dev;
1171 struct omap_dss_device *dssdev;
1172 int r;
1173
1174 dev_dbg(dev, "probe\n");
1175
1176 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
1177 if (!ddata)
1178 return -ENOMEM;
1179
1180 platform_set_drvdata(pdev, ddata);
1181 ddata->pdev = pdev;
1182
1183 if (!pdev->dev.of_node)
1184 return -ENODEV;
1185
1186 r = dsicm_probe_of(pdev);
1187 if (r)
1188 return r;
1189
1190 ddata->timings.x_res = 864;
1191 ddata->timings.y_res = 480;
1192 ddata->timings.pixelclock = 864 * 480 * 60;
1193
1194 dssdev = &ddata->dssdev;
1195 dssdev->dev = dev;
1196 dssdev->driver = &dsicm_ops;
1197 dssdev->panel.timings = ddata->timings;
1198 dssdev->type = OMAP_DISPLAY_TYPE_DSI;
1199 dssdev->owner = THIS_MODULE;
1200
1201 dssdev->panel.dsi_pix_fmt = OMAP_DSS_DSI_FMT_RGB888;
1202 dssdev->caps = OMAP_DSS_DISPLAY_CAP_MANUAL_UPDATE |
1203 OMAP_DSS_DISPLAY_CAP_TEAR_ELIM;
1204
1205 r = omapdss_register_display(dssdev);
1206 if (r) {
1207 dev_err(dev, "Failed to register panel\n");
1208 goto err_reg;
1209 }
1210
1211 mutex_init(&ddata->lock);
1212
1213 atomic_set(&ddata->do_update, 0);
1214
1215 if (gpio_is_valid(ddata->reset_gpio)) {
1216 r = devm_gpio_request_one(dev, ddata->reset_gpio,
1217 GPIOF_OUT_INIT_LOW, "taal rst");
1218 if (r) {
1219 dev_err(dev, "failed to request reset gpio\n");
1220 return r;
1221 }
1222 }
1223
1224 if (gpio_is_valid(ddata->ext_te_gpio)) {
1225 r = devm_gpio_request_one(dev, ddata->ext_te_gpio,
1226 GPIOF_IN, "taal irq");
1227 if (r) {
1228 dev_err(dev, "GPIO request failed\n");
1229 return r;
1230 }
1231
1232 r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio),
1233 dsicm_te_isr,
1234 IRQF_TRIGGER_RISING,
1235 "taal vsync", ddata);
1236
1237 if (r) {
1238 dev_err(dev, "IRQ request failed\n");
1239 return r;
1240 }
1241
1242 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
1243 dsicm_te_timeout_work_callback);
1244
1245 dev_dbg(dev, "Using GPIO TE\n");
1246 }
1247
1248 ddata->workqueue = create_singlethread_workqueue("dsicm_wq");
1249 if (ddata->workqueue == NULL) {
1250 dev_err(dev, "can't create workqueue\n");
1251 return -ENOMEM;
1252 }
1253 INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
1254
1255 dsicm_hw_reset(ddata);
1256
1257 if (ddata->use_dsi_backlight) {
1258 memset(&props, 0, sizeof(struct backlight_properties));
1259 props.max_brightness = 255;
1260
1261 props.type = BACKLIGHT_RAW;
1262 bldev = backlight_device_register(dev_name(dev),
1263 dev, ddata, &dsicm_bl_ops, &props);
1264 if (IS_ERR(bldev)) {
1265 r = PTR_ERR(bldev);
1266 goto err_bl;
1267 }
1268
1269 ddata->bldev = bldev;
1270
1271 bldev->props.fb_blank = FB_BLANK_UNBLANK;
1272 bldev->props.power = FB_BLANK_UNBLANK;
1273 bldev->props.brightness = 255;
1274
1275 dsicm_bl_update_status(bldev);
1276 }
1277
1278 r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
1279 if (r) {
1280 dev_err(dev, "failed to create sysfs files\n");
1281 goto err_sysfs_create;
1282 }
1283
1284 return 0;
1285
1286err_sysfs_create:
1287 if (bldev != NULL)
1288 backlight_device_unregister(bldev);
1289err_bl:
1290 destroy_workqueue(ddata->workqueue);
1291err_reg:
1292 return r;
1293}
1294
1295static int __exit dsicm_remove(struct platform_device *pdev)
1296{
1297 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1298 struct omap_dss_device *dssdev = &ddata->dssdev;
1299 struct backlight_device *bldev;
1300
1301 dev_dbg(&pdev->dev, "remove\n");
1302
1303 omapdss_unregister_display(dssdev);
1304
1305 dsicm_disable(dssdev);
1306 dsicm_disconnect(dssdev);
1307
1308 sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
1309
1310 bldev = ddata->bldev;
1311 if (bldev != NULL) {
1312 bldev->props.power = FB_BLANK_POWERDOWN;
1313 dsicm_bl_update_status(bldev);
1314 backlight_device_unregister(bldev);
1315 }
1316
1317 omap_dss_put_device(ddata->in);
1318
1319 dsicm_cancel_ulps_work(ddata);
1320 destroy_workqueue(ddata->workqueue);
1321
1322 /* reset, to be sure that the panel is in a valid state */
1323 dsicm_hw_reset(ddata);
1324
1325 return 0;
1326}
1327
1328static const struct of_device_id dsicm_of_match[] = {
1329 { .compatible = "omapdss,panel-dsi-cm", },
1330 {},
1331};
1332
1333MODULE_DEVICE_TABLE(of, dsicm_of_match);
1334
1335static struct platform_driver dsicm_driver = {
1336 .probe = dsicm_probe,
1337 .remove = __exit_p(dsicm_remove),
1338 .driver = {
1339 .name = "panel-dsi-cm",
1340 .of_match_table = dsicm_of_match,
1341 .suppress_bind_attrs = true,
1342 },
1343};
1344
1345module_platform_driver(dsicm_driver);
1346
1347MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
1348MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
1349MODULE_LICENSE("GPL");