1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
6 #include <linux/delay.h>
7 #include <linux/gpio/consumer.h>
8 #include <linux/module.h>
10 #include <linux/regulator/consumer.h>
12 #include <video/mipi_display.h>
14 #include <drm/drm_crtc.h>
15 #include <drm/drm_device.h>
16 #include <drm/drm_mipi_dsi.h>
17 #include <drm/drm_modes.h>
18 #include <drm/drm_panel.h>
19 #include <drm/drm_print.h>
21 struct kingdisplay_panel {
22 struct drm_panel base;
23 struct mipi_dsi_device *link;
25 struct regulator *supply;
26 struct gpio_desc *enable_gpio;
32 struct kingdisplay_panel_cmd {
38 * According to the discussion on
39 * https://review.coreboot.org/#/c/coreboot/+/22472/
40 * the panel init array is not part of the panels datasheet but instead
41 * just came in this form from the panel vendor.
43 static const struct kingdisplay_panel_cmd init_code[] = {
112 /* GOA MUX setting */
150 /* GOA timing setting */
179 struct kingdisplay_panel *to_kingdisplay_panel(struct drm_panel *panel)
181 return container_of(panel, struct kingdisplay_panel, base);
184 static int kingdisplay_panel_disable(struct drm_panel *panel)
186 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
189 if (!kingdisplay->enabled)
192 err = mipi_dsi_dcs_set_display_off(kingdisplay->link);
194 DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n",
197 kingdisplay->enabled = false;
202 static int kingdisplay_panel_unprepare(struct drm_panel *panel)
204 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
207 if (!kingdisplay->prepared)
210 err = mipi_dsi_dcs_enter_sleep_mode(kingdisplay->link);
212 DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n",
220 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 0);
222 err = regulator_disable(kingdisplay->supply);
226 kingdisplay->prepared = false;
231 static int kingdisplay_panel_prepare(struct drm_panel *panel)
233 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
234 int err, regulator_err;
237 if (kingdisplay->prepared)
240 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 0);
242 err = regulator_enable(kingdisplay->supply);
247 usleep_range(15000, 16000);
249 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 1);
252 usleep_range(15000, 16000);
254 for (i = 0; i < ARRAY_SIZE(init_code); i++) {
255 err = mipi_dsi_generic_write(kingdisplay->link, &init_code[i],
256 sizeof(struct kingdisplay_panel_cmd));
258 DRM_DEV_ERROR(panel->dev, "failed write init cmds: %d\n",
264 err = mipi_dsi_dcs_exit_sleep_mode(kingdisplay->link);
266 DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n",
274 err = mipi_dsi_dcs_set_display_on(kingdisplay->link);
276 DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n",
282 usleep_range(10000, 11000);
284 kingdisplay->prepared = true;
289 gpiod_set_value_cansleep(kingdisplay->enable_gpio, 0);
291 regulator_err = regulator_disable(kingdisplay->supply);
293 DRM_DEV_ERROR(panel->dev, "failed to disable regulator: %d\n",
299 static int kingdisplay_panel_enable(struct drm_panel *panel)
301 struct kingdisplay_panel *kingdisplay = to_kingdisplay_panel(panel);
303 if (kingdisplay->enabled)
306 kingdisplay->enabled = true;
311 static const struct drm_display_mode default_mode = {
314 .hsync_start = 1536 + 100,
315 .hsync_end = 1536 + 100 + 24,
316 .htotal = 1536 + 100 + 24 + 100,
318 .vsync_start = 2048 + 95,
319 .vsync_end = 2048 + 95 + 2,
320 .vtotal = 2048 + 95 + 2 + 23,
324 static int kingdisplay_panel_get_modes(struct drm_panel *panel,
325 struct drm_connector *connector)
327 struct drm_display_mode *mode;
329 mode = drm_mode_duplicate(connector->dev, &default_mode);
331 DRM_DEV_ERROR(panel->dev, "failed to add mode %ux%ux@%u\n",
332 default_mode.hdisplay, default_mode.vdisplay,
333 default_mode.vrefresh);
337 drm_mode_set_name(mode);
339 drm_mode_probed_add(connector, mode);
341 connector->display_info.width_mm = 147;
342 connector->display_info.height_mm = 196;
343 connector->display_info.bpc = 8;
348 static const struct drm_panel_funcs kingdisplay_panel_funcs = {
349 .disable = kingdisplay_panel_disable,
350 .unprepare = kingdisplay_panel_unprepare,
351 .prepare = kingdisplay_panel_prepare,
352 .enable = kingdisplay_panel_enable,
353 .get_modes = kingdisplay_panel_get_modes,
356 static const struct of_device_id kingdisplay_of_match[] = {
357 { .compatible = "kingdisplay,kd097d04", },
360 MODULE_DEVICE_TABLE(of, kingdisplay_of_match);
362 static int kingdisplay_panel_add(struct kingdisplay_panel *kingdisplay)
364 struct device *dev = &kingdisplay->link->dev;
367 kingdisplay->supply = devm_regulator_get(dev, "power");
368 if (IS_ERR(kingdisplay->supply))
369 return PTR_ERR(kingdisplay->supply);
371 kingdisplay->enable_gpio = devm_gpiod_get_optional(dev, "enable",
373 if (IS_ERR(kingdisplay->enable_gpio)) {
374 err = PTR_ERR(kingdisplay->enable_gpio);
375 dev_dbg(dev, "failed to get enable gpio: %d\n", err);
376 kingdisplay->enable_gpio = NULL;
379 drm_panel_init(&kingdisplay->base, &kingdisplay->link->dev,
380 &kingdisplay_panel_funcs, DRM_MODE_CONNECTOR_DSI);
382 err = drm_panel_of_backlight(&kingdisplay->base);
386 return drm_panel_add(&kingdisplay->base);
389 static void kingdisplay_panel_del(struct kingdisplay_panel *kingdisplay)
391 drm_panel_remove(&kingdisplay->base);
394 static int kingdisplay_panel_probe(struct mipi_dsi_device *dsi)
396 struct kingdisplay_panel *kingdisplay;
400 dsi->format = MIPI_DSI_FMT_RGB888;
401 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
404 kingdisplay = devm_kzalloc(&dsi->dev, sizeof(*kingdisplay), GFP_KERNEL);
408 mipi_dsi_set_drvdata(dsi, kingdisplay);
409 kingdisplay->link = dsi;
411 err = kingdisplay_panel_add(kingdisplay);
415 return mipi_dsi_attach(dsi);
418 static int kingdisplay_panel_remove(struct mipi_dsi_device *dsi)
420 struct kingdisplay_panel *kingdisplay = mipi_dsi_get_drvdata(dsi);
423 err = drm_panel_unprepare(&kingdisplay->base);
425 DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
428 err = drm_panel_disable(&kingdisplay->base);
430 DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
432 err = mipi_dsi_detach(dsi);
434 DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
437 kingdisplay_panel_del(kingdisplay);
442 static void kingdisplay_panel_shutdown(struct mipi_dsi_device *dsi)
444 struct kingdisplay_panel *kingdisplay = mipi_dsi_get_drvdata(dsi);
446 drm_panel_unprepare(&kingdisplay->base);
447 drm_panel_disable(&kingdisplay->base);
450 static struct mipi_dsi_driver kingdisplay_panel_driver = {
452 .name = "panel-kingdisplay-kd097d04",
453 .of_match_table = kingdisplay_of_match,
455 .probe = kingdisplay_panel_probe,
456 .remove = kingdisplay_panel_remove,
457 .shutdown = kingdisplay_panel_shutdown,
459 module_mipi_dsi_driver(kingdisplay_panel_driver);
461 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
462 MODULE_AUTHOR("Nickey Yang <nickey.yang@rock-chips.com>");
463 MODULE_DESCRIPTION("kingdisplay KD097D04 panel driver");
464 MODULE_LICENSE("GPL v2");