1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2016 InforceComputing
4 * Author: Vinay Simha BN <simhavcs@gmail.com>
6 * Copyright (C) 2016 Linaro Ltd
7 * Author: Sumit Semwal <sumit.semwal@linaro.org>
9 * From internet archives, the panel for Nexus 7 2nd Gen, 2013 model is a
10 * JDI model LT070ME05000, and its data sheet is at:
11 * http://panelone.net/en/7-0-inch/JDI_LT070ME05000_7.0_inch-datasheet
14 #include <linux/backlight.h>
15 #include <linux/delay.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/module.h>
19 #include <linux/regulator/consumer.h>
21 #include <video/mipi_display.h>
23 #include <drm/drm_crtc.h>
24 #include <drm/drm_mipi_dsi.h>
25 #include <drm/drm_modes.h>
26 #include <drm/drm_panel.h>
28 static const char * const regulator_names[] = {
34 struct drm_panel base;
35 struct mipi_dsi_device *dsi;
37 struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
39 struct gpio_desc *enable_gpio;
40 struct gpio_desc *reset_gpio;
41 struct gpio_desc *dcdc_en_gpio;
42 struct backlight_device *backlight;
47 const struct drm_display_mode *mode;
50 static inline struct jdi_panel *to_jdi_panel(struct drm_panel *panel)
52 return container_of(panel, struct jdi_panel, base);
55 static int jdi_panel_init(struct jdi_panel *jdi)
57 struct mipi_dsi_device *dsi = jdi->dsi;
58 struct device *dev = &jdi->dsi->dev;
61 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
63 ret = mipi_dsi_dcs_soft_reset(dsi);
67 usleep_range(10000, 20000);
69 ret = mipi_dsi_dcs_set_pixel_format(dsi, MIPI_DCS_PIXEL_FMT_24BIT << 4);
71 dev_err(dev, "failed to set pixel format: %d\n", ret);
75 ret = mipi_dsi_dcs_set_column_address(dsi, 0, jdi->mode->hdisplay - 1);
77 dev_err(dev, "failed to set column address: %d\n", ret);
81 ret = mipi_dsi_dcs_set_page_address(dsi, 0, jdi->mode->vdisplay - 1);
83 dev_err(dev, "failed to set page address: %d\n", ret);
88 * BIT(5) BCTRL = 1 Backlight Control Block On, Brightness registers
90 * BIT(3) BL = 1 Backlight Control On
91 * BIT(2) DD = 0 Display Dimming is Off
93 ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY,
96 dev_err(dev, "failed to write control display: %d\n", ret);
101 ret = mipi_dsi_dcs_write(dsi, MIPI_DCS_WRITE_POWER_SAVE,
104 dev_err(dev, "failed to set cabc off: %d\n", ret);
108 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
110 dev_err(dev, "failed to set exit sleep mode: %d\n", ret);
116 ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x00}, 2);
118 dev_err(dev, "failed to set mcap: %d\n", ret);
124 /* Interface setting, video mode */
125 ret = mipi_dsi_generic_write(dsi, (u8[])
126 {0xB3, 0x26, 0x08, 0x00, 0x20, 0x00}, 6);
128 dev_err(dev, "failed to set display interface setting: %d\n"
135 ret = mipi_dsi_generic_write(dsi, (u8[]){0xB0, 0x03}, 2);
137 dev_err(dev, "failed to set default values for mcap: %d\n"
145 static int jdi_panel_on(struct jdi_panel *jdi)
147 struct mipi_dsi_device *dsi = jdi->dsi;
148 struct device *dev = &jdi->dsi->dev;
151 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
153 ret = mipi_dsi_dcs_set_display_on(dsi);
155 dev_err(dev, "failed to set display on: %d\n", ret);
160 static void jdi_panel_off(struct jdi_panel *jdi)
162 struct mipi_dsi_device *dsi = jdi->dsi;
163 struct device *dev = &jdi->dsi->dev;
166 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
168 ret = mipi_dsi_dcs_set_display_off(dsi);
170 dev_err(dev, "failed to set display off: %d\n", ret);
172 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
174 dev_err(dev, "failed to enter sleep mode: %d\n", ret);
179 static int jdi_panel_disable(struct drm_panel *panel)
181 struct jdi_panel *jdi = to_jdi_panel(panel);
186 backlight_disable(jdi->backlight);
188 jdi->enabled = false;
193 static int jdi_panel_unprepare(struct drm_panel *panel)
195 struct jdi_panel *jdi = to_jdi_panel(panel);
196 struct device *dev = &jdi->dsi->dev;
204 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
206 dev_err(dev, "regulator disable failed, %d\n", ret);
208 gpiod_set_value(jdi->enable_gpio, 0);
210 gpiod_set_value(jdi->reset_gpio, 1);
212 gpiod_set_value(jdi->dcdc_en_gpio, 0);
214 jdi->prepared = false;
219 static int jdi_panel_prepare(struct drm_panel *panel)
221 struct jdi_panel *jdi = to_jdi_panel(panel);
222 struct device *dev = &jdi->dsi->dev;
228 ret = regulator_bulk_enable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
230 dev_err(dev, "regulator enable failed, %d\n", ret);
236 gpiod_set_value(jdi->dcdc_en_gpio, 1);
237 usleep_range(10, 20);
239 gpiod_set_value(jdi->reset_gpio, 0);
240 usleep_range(10, 20);
242 gpiod_set_value(jdi->enable_gpio, 1);
243 usleep_range(10, 20);
245 ret = jdi_panel_init(jdi);
247 dev_err(dev, "failed to init panel: %d\n", ret);
251 ret = jdi_panel_on(jdi);
253 dev_err(dev, "failed to set panel on: %d\n", ret);
257 jdi->prepared = true;
262 ret = regulator_bulk_disable(ARRAY_SIZE(jdi->supplies), jdi->supplies);
264 dev_err(dev, "regulator disable failed, %d\n", ret);
266 gpiod_set_value(jdi->enable_gpio, 0);
268 gpiod_set_value(jdi->reset_gpio, 1);
270 gpiod_set_value(jdi->dcdc_en_gpio, 0);
275 static int jdi_panel_enable(struct drm_panel *panel)
277 struct jdi_panel *jdi = to_jdi_panel(panel);
282 backlight_enable(jdi->backlight);
289 static const struct drm_display_mode default_mode = {
292 .hsync_start = 1200 + 48,
293 .hsync_end = 1200 + 48 + 32,
294 .htotal = 1200 + 48 + 32 + 60,
296 .vsync_start = 1920 + 3,
297 .vsync_end = 1920 + 3 + 5,
298 .vtotal = 1920 + 3 + 5 + 6,
302 static int jdi_panel_get_modes(struct drm_panel *panel,
303 struct drm_connector *connector)
305 struct drm_display_mode *mode;
306 struct jdi_panel *jdi = to_jdi_panel(panel);
307 struct device *dev = &jdi->dsi->dev;
309 mode = drm_mode_duplicate(connector->dev, &default_mode);
311 dev_err(dev, "failed to add mode %ux%ux@%u\n",
312 default_mode.hdisplay, default_mode.vdisplay,
313 drm_mode_vrefresh(&default_mode));
317 drm_mode_set_name(mode);
319 drm_mode_probed_add(connector, mode);
321 connector->display_info.width_mm = 95;
322 connector->display_info.height_mm = 151;
327 static int dsi_dcs_bl_get_brightness(struct backlight_device *bl)
329 struct mipi_dsi_device *dsi = bl_get_data(bl);
331 u16 brightness = bl->props.brightness;
333 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
335 ret = mipi_dsi_dcs_get_display_brightness(dsi, &brightness);
339 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
341 return brightness & 0xff;
344 static int dsi_dcs_bl_update_status(struct backlight_device *bl)
346 struct mipi_dsi_device *dsi = bl_get_data(bl);
349 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
351 ret = mipi_dsi_dcs_set_display_brightness(dsi, bl->props.brightness);
355 dsi->mode_flags |= MIPI_DSI_MODE_LPM;
360 static const struct backlight_ops dsi_bl_ops = {
361 .update_status = dsi_dcs_bl_update_status,
362 .get_brightness = dsi_dcs_bl_get_brightness,
365 static struct backlight_device *
366 drm_panel_create_dsi_backlight(struct mipi_dsi_device *dsi)
368 struct device *dev = &dsi->dev;
369 struct backlight_properties props;
371 memset(&props, 0, sizeof(props));
372 props.type = BACKLIGHT_RAW;
373 props.brightness = 255;
374 props.max_brightness = 255;
376 return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
377 &dsi_bl_ops, &props);
380 static const struct drm_panel_funcs jdi_panel_funcs = {
381 .disable = jdi_panel_disable,
382 .unprepare = jdi_panel_unprepare,
383 .prepare = jdi_panel_prepare,
384 .enable = jdi_panel_enable,
385 .get_modes = jdi_panel_get_modes,
388 static const struct of_device_id jdi_of_match[] = {
389 { .compatible = "jdi,lt070me05000", },
392 MODULE_DEVICE_TABLE(of, jdi_of_match);
394 static int jdi_panel_add(struct jdi_panel *jdi)
396 struct device *dev = &jdi->dsi->dev;
400 jdi->mode = &default_mode;
402 for (i = 0; i < ARRAY_SIZE(jdi->supplies); i++)
403 jdi->supplies[i].supply = regulator_names[i];
405 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(jdi->supplies),
408 dev_err(dev, "failed to init regulator, ret=%d\n", ret);
412 jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
413 if (IS_ERR(jdi->enable_gpio)) {
414 ret = PTR_ERR(jdi->enable_gpio);
415 dev_err(dev, "cannot get enable-gpio %d\n", ret);
419 jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
420 if (IS_ERR(jdi->reset_gpio)) {
421 ret = PTR_ERR(jdi->reset_gpio);
422 dev_err(dev, "cannot get reset-gpios %d\n", ret);
426 jdi->dcdc_en_gpio = devm_gpiod_get(dev, "dcdc-en", GPIOD_OUT_LOW);
427 if (IS_ERR(jdi->dcdc_en_gpio)) {
428 ret = PTR_ERR(jdi->dcdc_en_gpio);
429 dev_err(dev, "cannot get dcdc-en-gpio %d\n", ret);
433 jdi->backlight = drm_panel_create_dsi_backlight(jdi->dsi);
434 if (IS_ERR(jdi->backlight)) {
435 ret = PTR_ERR(jdi->backlight);
436 dev_err(dev, "failed to register backlight %d\n", ret);
440 drm_panel_init(&jdi->base, &jdi->dsi->dev, &jdi_panel_funcs,
441 DRM_MODE_CONNECTOR_DSI);
443 drm_panel_add(&jdi->base);
448 static void jdi_panel_del(struct jdi_panel *jdi)
451 drm_panel_remove(&jdi->base);
454 static int jdi_panel_probe(struct mipi_dsi_device *dsi)
456 struct jdi_panel *jdi;
460 dsi->format = MIPI_DSI_FMT_RGB888;
461 dsi->mode_flags = MIPI_DSI_MODE_VIDEO_HSE | MIPI_DSI_MODE_VIDEO |
462 MIPI_DSI_CLOCK_NON_CONTINUOUS;
464 jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL);
468 mipi_dsi_set_drvdata(dsi, jdi);
472 ret = jdi_panel_add(jdi);
476 ret = mipi_dsi_attach(dsi);
485 static void jdi_panel_remove(struct mipi_dsi_device *dsi)
487 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
490 ret = jdi_panel_disable(&jdi->base);
492 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
494 ret = mipi_dsi_detach(dsi);
496 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n",
502 static void jdi_panel_shutdown(struct mipi_dsi_device *dsi)
504 struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi);
506 jdi_panel_disable(&jdi->base);
509 static struct mipi_dsi_driver jdi_panel_driver = {
511 .name = "panel-jdi-lt070me05000",
512 .of_match_table = jdi_of_match,
514 .probe = jdi_panel_probe,
515 .remove = jdi_panel_remove,
516 .shutdown = jdi_panel_shutdown,
518 module_mipi_dsi_driver(jdi_panel_driver);
520 MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
521 MODULE_AUTHOR("Vinay Simha BN <simhavcs@gmail.com>");
522 MODULE_DESCRIPTION("JDI LT070ME05000 WUXGA");
523 MODULE_LICENSE("GPL v2");