2 * Generic DSI Command Mode panel driver
4 * Copyright (C) 2013 Texas Instruments
5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
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.
14 #include <linux/backlight.h>
15 #include <linux/delay.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/interrupt.h>
18 #include <linux/jiffies.h>
19 #include <linux/module.h>
20 #include <linux/platform_device.h>
21 #include <linux/sched/signal.h>
22 #include <linux/slab.h>
23 #include <linux/workqueue.h>
24 #include <linux/of_device.h>
25 #include <linux/of_gpio.h>
27 #include <video/mipi_display.h>
29 #include "../dss/omapdss.h"
31 /* DSI Virtual channel. Hardcoded for now. */
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
41 struct panel_drv_data {
42 struct omap_dss_device dssdev;
43 struct omap_dss_device *in;
47 struct platform_device *pdev;
51 struct backlight_device *bldev;
53 unsigned long hw_guard_end; /* next value of jiffies when we can
54 * issue the next sleep in/out command
56 unsigned long hw_guard_wait; /* max guard time in jiffies */
58 /* panel HW configuration from DT or platform data */
62 bool use_dsi_backlight;
64 struct omap_dsi_pin_config pin_config;
66 /* runtime variables */
74 struct delayed_work te_timeout_work;
78 struct workqueue_struct *workqueue;
81 unsigned ulps_timeout;
82 struct delayed_work ulps_work;
85 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
87 static irqreturn_t dsicm_te_isr(int irq, void *data);
88 static void dsicm_te_timeout_work_callback(struct work_struct *work);
89 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable);
91 static int dsicm_panel_reset(struct panel_drv_data *ddata);
93 static void dsicm_ulps_work(struct work_struct *work);
95 static void hw_guard_start(struct panel_drv_data *ddata, int guard_msec)
97 ddata->hw_guard_wait = msecs_to_jiffies(guard_msec);
98 ddata->hw_guard_end = jiffies + ddata->hw_guard_wait;
101 static void hw_guard_wait(struct panel_drv_data *ddata)
103 unsigned long wait = ddata->hw_guard_end - jiffies;
105 if ((long)wait > 0 && wait <= ddata->hw_guard_wait) {
106 set_current_state(TASK_UNINTERRUPTIBLE);
107 schedule_timeout(wait);
111 static int dsicm_dcs_read_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 *data)
113 struct omap_dss_device *in = ddata->in;
117 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd, buf, 1);
127 static int dsicm_dcs_write_0(struct panel_drv_data *ddata, u8 dcs_cmd)
129 struct omap_dss_device *in = ddata->in;
130 return in->ops.dsi->dcs_write(in, ddata->channel, &dcs_cmd, 1);
133 static int dsicm_dcs_write_1(struct panel_drv_data *ddata, u8 dcs_cmd, u8 param)
135 struct omap_dss_device *in = ddata->in;
136 u8 buf[2] = { dcs_cmd, param };
138 return in->ops.dsi->dcs_write(in, ddata->channel, buf, 2);
141 static int dsicm_sleep_in(struct panel_drv_data *ddata)
144 struct omap_dss_device *in = ddata->in;
148 hw_guard_wait(ddata);
150 cmd = MIPI_DCS_ENTER_SLEEP_MODE;
151 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, &cmd, 1);
155 hw_guard_start(ddata, 120);
157 usleep_range(5000, 10000);
162 static int dsicm_sleep_out(struct panel_drv_data *ddata)
166 hw_guard_wait(ddata);
168 r = dsicm_dcs_write_0(ddata, MIPI_DCS_EXIT_SLEEP_MODE);
172 hw_guard_start(ddata, 120);
174 usleep_range(5000, 10000);
179 static int dsicm_get_id(struct panel_drv_data *ddata, u8 *id1, u8 *id2, u8 *id3)
183 r = dsicm_dcs_read_1(ddata, DCS_GET_ID1, id1);
186 r = dsicm_dcs_read_1(ddata, DCS_GET_ID2, id2);
189 r = dsicm_dcs_read_1(ddata, DCS_GET_ID3, id3);
196 static int dsicm_set_update_window(struct panel_drv_data *ddata,
197 u16 x, u16 y, u16 w, u16 h)
199 struct omap_dss_device *in = ddata->in;
207 buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
208 buf[1] = (x1 >> 8) & 0xff;
209 buf[2] = (x1 >> 0) & 0xff;
210 buf[3] = (x2 >> 8) & 0xff;
211 buf[4] = (x2 >> 0) & 0xff;
213 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
217 buf[0] = MIPI_DCS_SET_PAGE_ADDRESS;
218 buf[1] = (y1 >> 8) & 0xff;
219 buf[2] = (y1 >> 0) & 0xff;
220 buf[3] = (y2 >> 8) & 0xff;
221 buf[4] = (y2 >> 0) & 0xff;
223 r = in->ops.dsi->dcs_write_nosync(in, ddata->channel, buf, sizeof(buf));
227 in->ops.dsi->bta_sync(in, ddata->channel);
232 static void dsicm_queue_ulps_work(struct panel_drv_data *ddata)
234 if (ddata->ulps_timeout > 0)
235 queue_delayed_work(ddata->workqueue, &ddata->ulps_work,
236 msecs_to_jiffies(ddata->ulps_timeout));
239 static void dsicm_cancel_ulps_work(struct panel_drv_data *ddata)
241 cancel_delayed_work(&ddata->ulps_work);
244 static int dsicm_enter_ulps(struct panel_drv_data *ddata)
246 struct omap_dss_device *in = ddata->in;
249 if (ddata->ulps_enabled)
252 dsicm_cancel_ulps_work(ddata);
254 r = _dsicm_enable_te(ddata, false);
258 if (gpio_is_valid(ddata->ext_te_gpio))
259 disable_irq(gpio_to_irq(ddata->ext_te_gpio));
261 in->ops.dsi->disable(in, false, true);
263 ddata->ulps_enabled = true;
268 dev_err(&ddata->pdev->dev, "enter ULPS failed");
269 dsicm_panel_reset(ddata);
271 ddata->ulps_enabled = false;
273 dsicm_queue_ulps_work(ddata);
278 static int dsicm_exit_ulps(struct panel_drv_data *ddata)
280 struct omap_dss_device *in = ddata->in;
283 if (!ddata->ulps_enabled)
286 r = in->ops.dsi->enable(in);
288 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
292 in->ops.dsi->enable_hs(in, ddata->channel, true);
294 r = _dsicm_enable_te(ddata, true);
296 dev_err(&ddata->pdev->dev, "failed to re-enable TE");
300 if (gpio_is_valid(ddata->ext_te_gpio))
301 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
303 dsicm_queue_ulps_work(ddata);
305 ddata->ulps_enabled = false;
310 dev_err(&ddata->pdev->dev, "failed to exit ULPS");
312 r = dsicm_panel_reset(ddata);
314 if (gpio_is_valid(ddata->ext_te_gpio))
315 enable_irq(gpio_to_irq(ddata->ext_te_gpio));
316 ddata->ulps_enabled = false;
319 dsicm_queue_ulps_work(ddata);
324 static int dsicm_wake_up(struct panel_drv_data *ddata)
326 if (ddata->ulps_enabled)
327 return dsicm_exit_ulps(ddata);
329 dsicm_cancel_ulps_work(ddata);
330 dsicm_queue_ulps_work(ddata);
334 static int dsicm_bl_update_status(struct backlight_device *dev)
336 struct panel_drv_data *ddata = dev_get_drvdata(&dev->dev);
337 struct omap_dss_device *in = ddata->in;
341 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
342 dev->props.power == FB_BLANK_UNBLANK)
343 level = dev->props.brightness;
347 dev_dbg(&ddata->pdev->dev, "update brightness to %d\n", level);
349 mutex_lock(&ddata->lock);
351 if (ddata->enabled) {
352 in->ops.dsi->bus_lock(in);
354 r = dsicm_wake_up(ddata);
356 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, level);
358 in->ops.dsi->bus_unlock(in);
363 mutex_unlock(&ddata->lock);
368 static int dsicm_bl_get_intensity(struct backlight_device *dev)
370 if (dev->props.fb_blank == FB_BLANK_UNBLANK &&
371 dev->props.power == FB_BLANK_UNBLANK)
372 return dev->props.brightness;
377 static const struct backlight_ops dsicm_bl_ops = {
378 .get_brightness = dsicm_bl_get_intensity,
379 .update_status = dsicm_bl_update_status,
382 static ssize_t dsicm_num_errors_show(struct device *dev,
383 struct device_attribute *attr, char *buf)
385 struct platform_device *pdev = to_platform_device(dev);
386 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
387 struct omap_dss_device *in = ddata->in;
391 mutex_lock(&ddata->lock);
393 if (ddata->enabled) {
394 in->ops.dsi->bus_lock(in);
396 r = dsicm_wake_up(ddata);
398 r = dsicm_dcs_read_1(ddata, DCS_READ_NUM_ERRORS,
401 in->ops.dsi->bus_unlock(in);
406 mutex_unlock(&ddata->lock);
411 return snprintf(buf, PAGE_SIZE, "%d\n", errors);
414 static ssize_t dsicm_hw_revision_show(struct device *dev,
415 struct device_attribute *attr, char *buf)
417 struct platform_device *pdev = to_platform_device(dev);
418 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
419 struct omap_dss_device *in = ddata->in;
423 mutex_lock(&ddata->lock);
425 if (ddata->enabled) {
426 in->ops.dsi->bus_lock(in);
428 r = dsicm_wake_up(ddata);
430 r = dsicm_get_id(ddata, &id1, &id2, &id3);
432 in->ops.dsi->bus_unlock(in);
437 mutex_unlock(&ddata->lock);
442 return snprintf(buf, PAGE_SIZE, "%02x.%02x.%02x\n", id1, id2, id3);
445 static ssize_t dsicm_store_ulps(struct device *dev,
446 struct device_attribute *attr,
447 const char *buf, size_t count)
449 struct platform_device *pdev = to_platform_device(dev);
450 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
451 struct omap_dss_device *in = ddata->in;
455 r = kstrtoul(buf, 0, &t);
459 mutex_lock(&ddata->lock);
461 if (ddata->enabled) {
462 in->ops.dsi->bus_lock(in);
465 r = dsicm_enter_ulps(ddata);
467 r = dsicm_wake_up(ddata);
469 in->ops.dsi->bus_unlock(in);
472 mutex_unlock(&ddata->lock);
480 static ssize_t dsicm_show_ulps(struct device *dev,
481 struct device_attribute *attr,
484 struct platform_device *pdev = to_platform_device(dev);
485 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
488 mutex_lock(&ddata->lock);
489 t = ddata->ulps_enabled;
490 mutex_unlock(&ddata->lock);
492 return snprintf(buf, PAGE_SIZE, "%u\n", t);
495 static ssize_t dsicm_store_ulps_timeout(struct device *dev,
496 struct device_attribute *attr,
497 const char *buf, size_t count)
499 struct platform_device *pdev = to_platform_device(dev);
500 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
501 struct omap_dss_device *in = ddata->in;
505 r = kstrtoul(buf, 0, &t);
509 mutex_lock(&ddata->lock);
510 ddata->ulps_timeout = t;
512 if (ddata->enabled) {
513 /* dsicm_wake_up will restart the timer */
514 in->ops.dsi->bus_lock(in);
515 r = dsicm_wake_up(ddata);
516 in->ops.dsi->bus_unlock(in);
519 mutex_unlock(&ddata->lock);
527 static ssize_t dsicm_show_ulps_timeout(struct device *dev,
528 struct device_attribute *attr,
531 struct platform_device *pdev = to_platform_device(dev);
532 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
535 mutex_lock(&ddata->lock);
536 t = ddata->ulps_timeout;
537 mutex_unlock(&ddata->lock);
539 return snprintf(buf, PAGE_SIZE, "%u\n", t);
542 static DEVICE_ATTR(num_dsi_errors, S_IRUGO, dsicm_num_errors_show, NULL);
543 static DEVICE_ATTR(hw_revision, S_IRUGO, dsicm_hw_revision_show, NULL);
544 static DEVICE_ATTR(ulps, S_IRUGO | S_IWUSR,
545 dsicm_show_ulps, dsicm_store_ulps);
546 static DEVICE_ATTR(ulps_timeout, S_IRUGO | S_IWUSR,
547 dsicm_show_ulps_timeout, dsicm_store_ulps_timeout);
549 static struct attribute *dsicm_attrs[] = {
550 &dev_attr_num_dsi_errors.attr,
551 &dev_attr_hw_revision.attr,
553 &dev_attr_ulps_timeout.attr,
557 static const struct attribute_group dsicm_attr_group = {
558 .attrs = dsicm_attrs,
561 static void dsicm_hw_reset(struct panel_drv_data *ddata)
563 if (!gpio_is_valid(ddata->reset_gpio))
566 gpio_set_value(ddata->reset_gpio, 1);
568 /* reset the panel */
569 gpio_set_value(ddata->reset_gpio, 0);
572 gpio_set_value(ddata->reset_gpio, 1);
573 /* wait after releasing reset */
574 usleep_range(5000, 10000);
577 static int dsicm_power_on(struct panel_drv_data *ddata)
579 struct omap_dss_device *in = ddata->in;
582 struct omap_dss_dsi_config dsi_config = {
583 .mode = OMAP_DSS_DSI_CMD_MODE,
584 .pixel_format = OMAP_DSS_DSI_FMT_RGB888,
586 .hs_clk_min = 150000000,
587 .hs_clk_max = 300000000,
588 .lp_clk_min = 7000000,
589 .lp_clk_max = 10000000,
592 if (ddata->pin_config.num_pins > 0) {
593 r = in->ops.dsi->configure_pins(in, &ddata->pin_config);
595 dev_err(&ddata->pdev->dev,
596 "failed to configure DSI pins\n");
601 r = in->ops.dsi->set_config(in, &dsi_config);
603 dev_err(&ddata->pdev->dev, "failed to configure DSI\n");
607 r = in->ops.dsi->enable(in);
609 dev_err(&ddata->pdev->dev, "failed to enable DSI\n");
613 dsicm_hw_reset(ddata);
615 in->ops.dsi->enable_hs(in, ddata->channel, false);
617 r = dsicm_sleep_out(ddata);
621 r = dsicm_get_id(ddata, &id1, &id2, &id3);
625 r = dsicm_dcs_write_1(ddata, DCS_BRIGHTNESS, 0xff);
629 r = dsicm_dcs_write_1(ddata, DCS_CTRL_DISPLAY,
630 (1<<2) | (1<<5)); /* BL | BCTRL */
634 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_PIXEL_FORMAT,
635 MIPI_DCS_PIXEL_FMT_24BIT);
639 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_ON);
643 r = _dsicm_enable_te(ddata, ddata->te_enabled);
647 r = in->ops.dsi->enable_video_output(in, ddata->channel);
653 if (!ddata->intro_printed) {
654 dev_info(&ddata->pdev->dev, "panel revision %02x.%02x.%02x\n",
656 ddata->intro_printed = true;
659 in->ops.dsi->enable_hs(in, ddata->channel, true);
663 dev_err(&ddata->pdev->dev, "error while enabling panel, issuing HW reset\n");
665 dsicm_hw_reset(ddata);
667 in->ops.dsi->disable(in, true, false);
672 static void dsicm_power_off(struct panel_drv_data *ddata)
674 struct omap_dss_device *in = ddata->in;
677 in->ops.dsi->disable_video_output(in, ddata->channel);
679 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_DISPLAY_OFF);
681 r = dsicm_sleep_in(ddata);
684 dev_err(&ddata->pdev->dev,
685 "error disabling panel, issuing HW reset\n");
686 dsicm_hw_reset(ddata);
689 in->ops.dsi->disable(in, true, false);
694 static int dsicm_panel_reset(struct panel_drv_data *ddata)
696 dev_err(&ddata->pdev->dev, "performing LCD reset\n");
698 dsicm_power_off(ddata);
699 dsicm_hw_reset(ddata);
700 return dsicm_power_on(ddata);
703 static int dsicm_connect(struct omap_dss_device *dssdev)
705 struct panel_drv_data *ddata = to_panel_data(dssdev);
706 struct omap_dss_device *in = ddata->in;
707 struct device *dev = &ddata->pdev->dev;
710 if (omapdss_device_is_connected(dssdev))
713 r = in->ops.dsi->connect(in, dssdev);
715 dev_err(dev, "Failed to connect to video source\n");
719 r = in->ops.dsi->request_vc(ddata->in, &ddata->channel);
721 dev_err(dev, "failed to get virtual channel\n");
725 r = in->ops.dsi->set_vc_id(ddata->in, ddata->channel, TCH);
727 dev_err(dev, "failed to set VC_ID\n");
734 in->ops.dsi->release_vc(ddata->in, ddata->channel);
736 in->ops.dsi->disconnect(in, dssdev);
740 static void dsicm_disconnect(struct omap_dss_device *dssdev)
742 struct panel_drv_data *ddata = to_panel_data(dssdev);
743 struct omap_dss_device *in = ddata->in;
745 if (!omapdss_device_is_connected(dssdev))
748 in->ops.dsi->release_vc(in, ddata->channel);
749 in->ops.dsi->disconnect(in, dssdev);
752 static int dsicm_enable(struct omap_dss_device *dssdev)
754 struct panel_drv_data *ddata = to_panel_data(dssdev);
755 struct omap_dss_device *in = ddata->in;
758 dev_dbg(&ddata->pdev->dev, "enable\n");
760 mutex_lock(&ddata->lock);
762 if (!omapdss_device_is_connected(dssdev)) {
767 if (omapdss_device_is_enabled(dssdev)) {
772 in->ops.dsi->bus_lock(in);
774 r = dsicm_power_on(ddata);
776 in->ops.dsi->bus_unlock(in);
781 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
783 mutex_unlock(&ddata->lock);
787 dev_dbg(&ddata->pdev->dev, "enable failed\n");
788 mutex_unlock(&ddata->lock);
792 static void dsicm_disable(struct omap_dss_device *dssdev)
794 struct panel_drv_data *ddata = to_panel_data(dssdev);
795 struct omap_dss_device *in = ddata->in;
798 dev_dbg(&ddata->pdev->dev, "disable\n");
800 mutex_lock(&ddata->lock);
802 dsicm_cancel_ulps_work(ddata);
804 in->ops.dsi->bus_lock(in);
806 if (omapdss_device_is_enabled(dssdev)) {
807 r = dsicm_wake_up(ddata);
809 dsicm_power_off(ddata);
812 in->ops.dsi->bus_unlock(in);
814 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
816 mutex_unlock(&ddata->lock);
819 static void dsicm_framedone_cb(int err, void *data)
821 struct panel_drv_data *ddata = data;
822 struct omap_dss_device *in = ddata->in;
824 dev_dbg(&ddata->pdev->dev, "framedone, err %d\n", err);
825 in->ops.dsi->bus_unlock(ddata->in);
828 static irqreturn_t dsicm_te_isr(int irq, void *data)
830 struct panel_drv_data *ddata = data;
831 struct omap_dss_device *in = ddata->in;
835 old = atomic_cmpxchg(&ddata->do_update, 1, 0);
838 cancel_delayed_work(&ddata->te_timeout_work);
840 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
848 dev_err(&ddata->pdev->dev, "start update failed\n");
849 in->ops.dsi->bus_unlock(in);
853 static void dsicm_te_timeout_work_callback(struct work_struct *work)
855 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
856 te_timeout_work.work);
857 struct omap_dss_device *in = ddata->in;
859 dev_err(&ddata->pdev->dev, "TE not received for 250ms!\n");
861 atomic_set(&ddata->do_update, 0);
862 in->ops.dsi->bus_unlock(in);
865 static int dsicm_update(struct omap_dss_device *dssdev,
866 u16 x, u16 y, u16 w, u16 h)
868 struct panel_drv_data *ddata = to_panel_data(dssdev);
869 struct omap_dss_device *in = ddata->in;
872 dev_dbg(&ddata->pdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
874 mutex_lock(&ddata->lock);
875 in->ops.dsi->bus_lock(in);
877 r = dsicm_wake_up(ddata);
881 if (!ddata->enabled) {
886 /* XXX no need to send this every frame, but dsi break if not done */
887 r = dsicm_set_update_window(ddata, 0, 0,
888 dssdev->panel.vm.hactive,
889 dssdev->panel.vm.vactive);
893 if (ddata->te_enabled && gpio_is_valid(ddata->ext_te_gpio)) {
894 schedule_delayed_work(&ddata->te_timeout_work,
895 msecs_to_jiffies(250));
896 atomic_set(&ddata->do_update, 1);
898 r = in->ops.dsi->update(in, ddata->channel, dsicm_framedone_cb,
904 /* note: no bus_unlock here. unlock is in framedone_cb */
905 mutex_unlock(&ddata->lock);
908 in->ops.dsi->bus_unlock(in);
909 mutex_unlock(&ddata->lock);
913 static int dsicm_sync(struct omap_dss_device *dssdev)
915 struct panel_drv_data *ddata = to_panel_data(dssdev);
916 struct omap_dss_device *in = ddata->in;
918 dev_dbg(&ddata->pdev->dev, "sync\n");
920 mutex_lock(&ddata->lock);
921 in->ops.dsi->bus_lock(in);
922 in->ops.dsi->bus_unlock(in);
923 mutex_unlock(&ddata->lock);
925 dev_dbg(&ddata->pdev->dev, "sync done\n");
930 static int _dsicm_enable_te(struct panel_drv_data *ddata, bool enable)
932 struct omap_dss_device *in = ddata->in;
936 r = dsicm_dcs_write_1(ddata, MIPI_DCS_SET_TEAR_ON, 0);
938 r = dsicm_dcs_write_0(ddata, MIPI_DCS_SET_TEAR_OFF);
940 if (!gpio_is_valid(ddata->ext_te_gpio))
941 in->ops.dsi->enable_te(in, enable);
943 /* possible panel bug */
949 static int dsicm_enable_te(struct omap_dss_device *dssdev, bool enable)
951 struct panel_drv_data *ddata = to_panel_data(dssdev);
952 struct omap_dss_device *in = ddata->in;
955 mutex_lock(&ddata->lock);
957 if (ddata->te_enabled == enable)
960 in->ops.dsi->bus_lock(in);
962 if (ddata->enabled) {
963 r = dsicm_wake_up(ddata);
967 r = _dsicm_enable_te(ddata, enable);
972 ddata->te_enabled = enable;
974 in->ops.dsi->bus_unlock(in);
976 mutex_unlock(&ddata->lock);
980 in->ops.dsi->bus_unlock(in);
981 mutex_unlock(&ddata->lock);
986 static int dsicm_get_te(struct omap_dss_device *dssdev)
988 struct panel_drv_data *ddata = to_panel_data(dssdev);
991 mutex_lock(&ddata->lock);
992 r = ddata->te_enabled;
993 mutex_unlock(&ddata->lock);
998 static int dsicm_memory_read(struct omap_dss_device *dssdev,
999 void *buf, size_t size,
1000 u16 x, u16 y, u16 w, u16 h)
1002 struct panel_drv_data *ddata = to_panel_data(dssdev);
1003 struct omap_dss_device *in = ddata->in;
1007 unsigned buf_used = 0;
1009 if (size < w * h * 3)
1012 mutex_lock(&ddata->lock);
1014 if (!ddata->enabled) {
1019 size = min((u32)w * h * 3,
1020 dssdev->panel.vm.hactive * dssdev->panel.vm.vactive * 3);
1022 in->ops.dsi->bus_lock(in);
1024 r = dsicm_wake_up(ddata);
1028 /* plen 1 or 2 goes into short packet. until checksum error is fixed,
1029 * use short packets. plen 32 works, but bigger packets seem to cause
1036 dsicm_set_update_window(ddata, x, y, w, h);
1038 r = in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, plen);
1042 while (buf_used < size) {
1043 u8 dcs_cmd = first ? 0x2e : 0x3e;
1046 r = in->ops.dsi->dcs_read(in, ddata->channel, dcs_cmd,
1047 buf + buf_used, size - buf_used);
1050 dev_err(dssdev->dev, "read error\n");
1057 dev_err(&ddata->pdev->dev, "short read\n");
1061 if (signal_pending(current)) {
1062 dev_err(&ddata->pdev->dev, "signal pending, "
1063 "aborting memory read\n");
1072 in->ops.dsi->set_max_rx_packet_size(in, ddata->channel, 1);
1074 in->ops.dsi->bus_unlock(in);
1076 mutex_unlock(&ddata->lock);
1080 static void dsicm_ulps_work(struct work_struct *work)
1082 struct panel_drv_data *ddata = container_of(work, struct panel_drv_data,
1084 struct omap_dss_device *dssdev = &ddata->dssdev;
1085 struct omap_dss_device *in = ddata->in;
1087 mutex_lock(&ddata->lock);
1089 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE || !ddata->enabled) {
1090 mutex_unlock(&ddata->lock);
1094 in->ops.dsi->bus_lock(in);
1096 dsicm_enter_ulps(ddata);
1098 in->ops.dsi->bus_unlock(in);
1099 mutex_unlock(&ddata->lock);
1102 static struct omap_dss_driver dsicm_ops = {
1103 .connect = dsicm_connect,
1104 .disconnect = dsicm_disconnect,
1106 .enable = dsicm_enable,
1107 .disable = dsicm_disable,
1109 .update = dsicm_update,
1112 .enable_te = dsicm_enable_te,
1113 .get_te = dsicm_get_te,
1115 .memory_read = dsicm_memory_read,
1118 static int dsicm_probe_of(struct platform_device *pdev)
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;
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");
1130 ddata->reset_gpio = gpio;
1132 gpio = of_get_named_gpio(node, "te-gpios", 0);
1133 if (gpio_is_valid(gpio) || gpio == -ENOENT) {
1134 ddata->ext_te_gpio = gpio;
1136 dev_err(&pdev->dev, "failed to parse TE gpio\n");
1140 in = omapdss_of_find_source_for_first_ep(node);
1142 dev_err(&pdev->dev, "failed to find video source\n");
1148 /* TODO: ulps, backlight */
1153 static int dsicm_probe(struct platform_device *pdev)
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;
1162 dev_dbg(dev, "probe\n");
1164 ddata = devm_kzalloc(dev, sizeof(*ddata), GFP_KERNEL);
1168 platform_set_drvdata(pdev, ddata);
1171 if (!pdev->dev.of_node)
1174 r = dsicm_probe_of(pdev);
1178 ddata->vm.hactive = 864;
1179 ddata->vm.vactive = 480;
1180 ddata->vm.pixelclock = 864 * 480 * 60;
1182 dssdev = &ddata->dssdev;
1184 dssdev->driver = &dsicm_ops;
1185 dssdev->panel.vm = ddata->vm;
1186 dssdev->type = OMAP_DISPLAY_TYPE_DSI;
1187 dssdev->owner = THIS_MODULE;
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;
1193 r = omapdss_register_display(dssdev);
1195 dev_err(dev, "Failed to register panel\n");
1199 mutex_init(&ddata->lock);
1201 atomic_set(&ddata->do_update, 0);
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");
1207 dev_err(dev, "failed to request reset gpio\n");
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");
1216 dev_err(dev, "GPIO request failed\n");
1220 r = devm_request_irq(dev, gpio_to_irq(ddata->ext_te_gpio),
1222 IRQF_TRIGGER_RISING,
1223 "taal vsync", ddata);
1226 dev_err(dev, "IRQ request failed\n");
1230 INIT_DEFERRABLE_WORK(&ddata->te_timeout_work,
1231 dsicm_te_timeout_work_callback);
1233 dev_dbg(dev, "Using GPIO TE\n");
1236 ddata->workqueue = create_singlethread_workqueue("dsicm_wq");
1237 if (ddata->workqueue == NULL) {
1238 dev_err(dev, "can't create workqueue\n");
1241 INIT_DELAYED_WORK(&ddata->ulps_work, dsicm_ulps_work);
1243 dsicm_hw_reset(ddata);
1245 if (ddata->use_dsi_backlight) {
1246 memset(&props, 0, sizeof(props));
1247 props.max_brightness = 255;
1249 props.type = BACKLIGHT_RAW;
1250 bldev = backlight_device_register(dev_name(dev),
1251 dev, ddata, &dsicm_bl_ops, &props);
1252 if (IS_ERR(bldev)) {
1257 ddata->bldev = bldev;
1259 bldev->props.fb_blank = FB_BLANK_UNBLANK;
1260 bldev->props.power = FB_BLANK_UNBLANK;
1261 bldev->props.brightness = 255;
1263 dsicm_bl_update_status(bldev);
1266 r = sysfs_create_group(&dev->kobj, &dsicm_attr_group);
1268 dev_err(dev, "failed to create sysfs files\n");
1269 goto err_sysfs_create;
1275 backlight_device_unregister(bldev);
1277 destroy_workqueue(ddata->workqueue);
1282 static int __exit dsicm_remove(struct platform_device *pdev)
1284 struct panel_drv_data *ddata = platform_get_drvdata(pdev);
1285 struct omap_dss_device *dssdev = &ddata->dssdev;
1286 struct backlight_device *bldev;
1288 dev_dbg(&pdev->dev, "remove\n");
1290 omapdss_unregister_display(dssdev);
1292 dsicm_disable(dssdev);
1293 dsicm_disconnect(dssdev);
1295 sysfs_remove_group(&pdev->dev.kobj, &dsicm_attr_group);
1297 bldev = ddata->bldev;
1298 if (bldev != NULL) {
1299 bldev->props.power = FB_BLANK_POWERDOWN;
1300 dsicm_bl_update_status(bldev);
1301 backlight_device_unregister(bldev);
1304 omap_dss_put_device(ddata->in);
1306 dsicm_cancel_ulps_work(ddata);
1307 destroy_workqueue(ddata->workqueue);
1309 /* reset, to be sure that the panel is in a valid state */
1310 dsicm_hw_reset(ddata);
1315 static const struct of_device_id dsicm_of_match[] = {
1316 { .compatible = "omapdss,panel-dsi-cm", },
1320 MODULE_DEVICE_TABLE(of, dsicm_of_match);
1322 static struct platform_driver dsicm_driver = {
1323 .probe = dsicm_probe,
1324 .remove = __exit_p(dsicm_remove),
1326 .name = "panel-dsi-cm",
1327 .of_match_table = dsicm_of_match,
1328 .suppress_bind_attrs = true,
1332 module_platform_driver(dsicm_driver);
1334 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
1335 MODULE_DESCRIPTION("Generic DSI Command Mode Panel Driver");
1336 MODULE_LICENSE("GPL");