1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
6 #include <linux/backlight.h>
7 #include <linux/delay.h>
8 #include <linux/gpio/consumer.h>
9 #include <linux/module.h>
11 #include <linux/regulator/consumer.h>
13 #include <video/mipi_display.h>
15 #include <drm/drm_crtc.h>
16 #include <drm/drm_device.h>
17 #include <drm/drm_mipi_dsi.h>
18 #include <drm/drm_modes.h>
19 #include <drm/drm_panel.h>
20 #include <drm/drm_print.h>
22 struct kingdisplay_panel {
23 struct drm_panel base;
24 struct mipi_dsi_device *link;
26 struct backlight_device *backlight;
27 struct regulator *supply;
28 struct gpio_desc *enable_gpio;
34 struct kingdisplay_panel_cmd {
40 * According to the discussion on
41 * https://review.coreboot.org/#/c/coreboot/+/22472/
42 * the panel init array is not part of the panels datasheet but instead
43 * just came in this form from the panel vendor.
45 static const struct kingdisplay_panel_cmd init_code[] = {
114 /* GOA MUX setting */
152 /* GOA timing setting */
181 struct kingdisplay_panel *to_kingdisplay_panel(struct drm_panel *panel)
183 return container_of(panel, struct kingdisplay_panel, base);
186 static int kingdisplay_panel_disable(struct drm_panel *panel)
188 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
191 if (!kingdisplay->enabled)
194 backlight_disable(kingdisplay->backlight);
196 err = mipi_dsi_dcs_set_display_off(kingdisplay->link);
198 DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n",
201 kingdisplay->enabled = false;
206 static int kingdisplay_panel_unprepare(struct drm_panel *panel)
208 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
211 if (!kingdisplay->prepared)
214 err = mipi_dsi_dcs_enter_sleep_mode(kingdisplay->link);
216 DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n",
224 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 0);
226 err = regulator_disable(kingdisplay->supply);
230 kingdisplay->prepared = false;
235 static int kingdisplay_panel_prepare(struct drm_panel *panel)
237 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
238 int err, regulator_err;
241 if (kingdisplay->prepared)
244 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 0);
246 err = regulator_enable(kingdisplay->supply);
251 usleep_range(15000, 16000);
253 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 1);
256 usleep_range(15000, 16000);
258 for (i = 0; i < ARRAY_SIZE(init_code); i++) {
259 err = mipi_dsi_generic_write(kingdisplay->link, &init_code[i],
260 sizeof(struct kingdisplay_panel_cmd));
262 DRM_DEV_ERROR(panel->dev, "failed write init cmds: %d\n",
268 err = mipi_dsi_dcs_exit_sleep_mode(kingdisplay->link);
270 DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
278 err = mipi_dsi_dcs_set_display_on(kingdisplay->link);
280 DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
286 usleep_range(10000, 11000);
288 kingdisplay->prepared = true;
293 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 0);
295 regulator_err = regulator_disable(kingdisplay->supply);
297 DRM_DEV_ERROR(panel->dev, "failed to disable regulator: %d\n",
303 static int kingdisplay_panel_enable(struct drm_panel *panel)
305 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
308 if (kingdisplay->enabled)
311 ret = backlight_enable(kingdisplay->backlight);
313 DRM_DEV_ERROR(panel->drm->dev,
314 "Failed to enable backlight %d\n", ret);
318 kingdisplay->enabled = true;
323 static const struct drm_display_mode default_mode = {
326 .hsync_start = 1536 + 100,
327 .hsync_end = 1536 + 100 + 24,
328 .htotal = 1536 + 100 + 24 + 100,
330 .vsync_start = 2048 + 95,
331 .vsync_end = 2048 + 95 + 2,
332 .vtotal = 2048 + 95 + 2 + 23,
336 static int kingdisplay_panel_get_modes(struct drm_panel *panel)
338 struct drm_display_mode *mode;
340 mode = drm_mode_duplicate(panel->drm, &default_mode);
342 DRM_DEV_ERROR(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
343 default_mode.hdisplay, default_mode.vdisplay,
344 default_mode.vrefresh);
348 drm_mode_set_name(mode);
350 drm_mode_probed_add(panel->connector, mode);
352 panel->connector->display_info.width_mm = 147;
353 panel->connector->display_info.height_mm = 196;
354 panel->connector->display_info.bpc = 8;
359 static const struct drm_panel_funcs kingdisplay_panel_funcs = {
360 .disable = kingdisplay_panel_disable,
361 .unprepare = kingdisplay_panel_unprepare,
362 .prepare = kingdisplay_panel_prepare,
363 .enable = kingdisplay_panel_enable,
364 .get_modes = kingdisplay_panel_get_modes,
367 static const struct of_device_id kingdisplay_of_match[] = {
368 { .compatible = "kingdisplay,kd097d04", },
371 MODULE_DEVICE_TABLE(of, kingdisplay_of_match);
373 static int kingdisplay_panel_add(struct kingdisplay_panel *kingdisplay)
375 struct device *dev = &kingdisplay->link->dev;
378 kingdisplay->supply = devm_regulator_get(dev, "power");
379 if (IS_ERR(kingdisplay->supply))
380 return PTR_ERR(kingdisplay->supply);
382 kingdisplay->enable_gpio = devm_gpiod_get_optional(dev, "enable",
384 if (IS_ERR(kingdisplay->enable_gpio)) {
385 err = PTR_ERR(kingdisplay->enable_gpio);
386 dev_dbg(dev, "failed to get enable gpio: %d\n", err);
387 kingdisplay->enable_gpio = NULL;
390 kingdisplay->backlight = devm_of_find_backlight(dev);
391 if (IS_ERR(kingdisplay->backlight))
392 return PTR_ERR(kingdisplay->backlight);
394 drm_panel_init(&kingdisplay->base);
395 kingdisplay->base.funcs = &kingdisplay_panel_funcs;
396 kingdisplay->base.dev = &kingdisplay->link->dev;
398 return drm_panel_add(&kingdisplay->base);
401 static void kingdisplay_panel_del(struct kingdisplay_panel *kingdisplay)
403 drm_panel_remove(&kingdisplay->base);
406 static int kingdisplay_panel_probe(struct mipi_dsi_device *dsi)
408 struct kingdisplay_panel *kingdisplay;
412 dsi->format = MIPI_DSI_FMT_RGB888;
413 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
416 kingdisplay = devm_kzalloc(&dsi->dev, sizeof(*kingdisplay), GFP_KERNEL);
420 mipi_dsi_set_drvdata(dsi, kingdisplay);
421 kingdisplay->link = dsi;
423 err = kingdisplay_panel_add(kingdisplay);
427 return mipi_dsi_attach(dsi);
430 static int kingdisplay_panel_remove(struct mipi_dsi_device *dsi)
432 struct kingdisplay_panel *kingdisplay = mipi_dsi_get_drvdata(dsi);
435 err = kingdisplay_panel_unprepare(&kingdisplay->base);
437 DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
440 err = kingdisplay_panel_disable(&kingdisplay->base);
442 DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
444 err = mipi_dsi_detach(dsi);
446 DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
449 kingdisplay_panel_del(kingdisplay);
454 static void kingdisplay_panel_shutdown(struct mipi_dsi_device *dsi)
456 struct kingdisplay_panel *kingdisplay = mipi_dsi_get_drvdata(dsi);
458 kingdisplay_panel_unprepare(&kingdisplay->base);
459 kingdisplay_panel_disable(&kingdisplay->base);
462 static struct mipi_dsi_driver kingdisplay_panel_driver = {
464 .name = "panel-kingdisplay-kd097d04",
465 .of_match_table = kingdisplay_of_match,
467 .probe = kingdisplay_panel_probe,
468 .remove = kingdisplay_panel_remove,
469 .shutdown = kingdisplay_panel_shutdown,
471 module_mipi_dsi_driver(kingdisplay_panel_driver);
473 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
474 MODULE_AUTHOR("Nickey Yang <nickey.yang@rock-chips.com>");
475 MODULE_DESCRIPTION("kingdisplay KD097D04 panel driver");
476 MODULE_LICENSE("GPL v2");