1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2019 Theobroma Systems Design und Consulting GmbH
5 * base on panel-kingdisplay-kd097d04.c
6 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
9 #include <linux/backlight.h>
10 #include <linux/delay.h>
11 #include <linux/gpio/consumer.h>
12 #include <linux/module.h>
14 #include <linux/regulator/consumer.h>
16 #include <video/mipi_display.h>
18 #include <drm/drm_crtc.h>
19 #include <drm/drm_device.h>
20 #include <drm/drm_mipi_dsi.h>
21 #include <drm/drm_modes.h>
22 #include <drm/drm_panel.h>
26 struct drm_panel panel;
27 struct gpio_desc *reset_gpio;
28 struct regulator *vcc;
29 struct regulator *iovcc;
33 struct ltk500hd1829_cmd {
39 * There is no description in the Reference Manual about these commands.
40 * We received them from the vendor, so just use them as is.
42 static const struct ltk500hd1829_cmd init_code[] = {
264 struct ltk500hd1829 *panel_to_ltk500hd1829(struct drm_panel *panel)
266 return container_of(panel, struct ltk500hd1829, panel);
269 static int ltk500hd1829_unprepare(struct drm_panel *panel)
271 struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
272 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
278 ret = mipi_dsi_dcs_set_display_off(dsi);
280 dev_err(panel->dev, "failed to set display off: %d\n", ret);
282 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
284 dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret);
287 /* 120ms to enter sleep mode */
290 regulator_disable(ctx->iovcc);
291 regulator_disable(ctx->vcc);
293 ctx->prepared = false;
298 static int ltk500hd1829_prepare(struct drm_panel *panel)
300 struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
301 struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
308 ret = regulator_enable(ctx->vcc);
310 dev_err(ctx->dev, "Failed to enable vci supply: %d\n", ret);
313 ret = regulator_enable(ctx->iovcc);
315 dev_err(ctx->dev, "Failed to enable iovcc supply: %d\n", ret);
319 gpiod_set_value_cansleep(ctx->reset_gpio, 1);
321 usleep_range(10, 20);
322 gpiod_set_value_cansleep(ctx->reset_gpio, 0);
325 usleep_range(5000, 6000);
327 for (i = 0; i < ARRAY_SIZE(init_code); i++) {
328 ret = mipi_dsi_generic_write(dsi, &init_code[i],
329 sizeof(struct ltk500hd1829_cmd));
331 dev_err(panel->dev, "failed to write init cmds: %d\n", ret);
336 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
338 dev_err(panel->dev, "failed to exit sleep mode: %d\n", ret);
342 /* 120ms to exit sleep mode */
345 ret = mipi_dsi_dcs_set_display_on(dsi);
347 dev_err(panel->dev, "failed to set display on: %d\n", ret);
351 ctx->prepared = true;
356 regulator_disable(ctx->iovcc);
358 regulator_disable(ctx->vcc);
362 static const struct drm_display_mode default_mode = {
364 .hsync_start = 720 + 50,
365 .hsync_end = 720 + 50 + 50,
366 .htotal = 720 + 50 + 50 + 50,
368 .vsync_start = 1280 + 30,
369 .vsync_end = 1280 + 30 + 4,
370 .vtotal = 1280 + 30 + 4 + 12,
376 static int ltk500hd1829_get_modes(struct drm_panel *panel,
377 struct drm_connector *connector)
379 struct ltk500hd1829 *ctx = panel_to_ltk500hd1829(panel);
380 struct drm_display_mode *mode;
382 mode = drm_mode_duplicate(connector->dev, &default_mode);
384 dev_err(ctx->dev, "failed to add mode %ux%u@%u\n",
385 default_mode.hdisplay, default_mode.vdisplay,
386 drm_mode_vrefresh(&default_mode));
390 drm_mode_set_name(mode);
392 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
393 connector->display_info.width_mm = mode->width_mm;
394 connector->display_info.height_mm = mode->height_mm;
395 drm_mode_probed_add(connector, mode);
400 static const struct drm_panel_funcs ltk500hd1829_funcs = {
401 .unprepare = ltk500hd1829_unprepare,
402 .prepare = ltk500hd1829_prepare,
403 .get_modes = ltk500hd1829_get_modes,
406 static int ltk500hd1829_probe(struct mipi_dsi_device *dsi)
408 struct ltk500hd1829 *ctx;
409 struct device *dev = &dsi->dev;
412 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
416 ctx->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
417 if (IS_ERR(ctx->reset_gpio)) {
418 dev_err(dev, "cannot get reset gpio\n");
419 return PTR_ERR(ctx->reset_gpio);
422 ctx->vcc = devm_regulator_get(dev, "vcc");
423 if (IS_ERR(ctx->vcc)) {
424 ret = PTR_ERR(ctx->vcc);
425 if (ret != -EPROBE_DEFER)
426 dev_err(dev, "Failed to request vcc regulator: %d\n", ret);
430 ctx->iovcc = devm_regulator_get(dev, "iovcc");
431 if (IS_ERR(ctx->iovcc)) {
432 ret = PTR_ERR(ctx->iovcc);
433 if (ret != -EPROBE_DEFER)
434 dev_err(dev, "Failed to request iovcc regulator: %d\n", ret);
438 mipi_dsi_set_drvdata(dsi, ctx);
443 dsi->format = MIPI_DSI_FMT_RGB888;
444 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
445 MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_NO_EOT_PACKET;
447 drm_panel_init(&ctx->panel, &dsi->dev, <k500hd1829_funcs,
448 DRM_MODE_CONNECTOR_DSI);
450 ret = drm_panel_of_backlight(&ctx->panel);
454 drm_panel_add(&ctx->panel);
456 ret = mipi_dsi_attach(dsi);
458 dev_err(dev, "mipi_dsi_attach failed: %d\n", ret);
459 drm_panel_remove(&ctx->panel);
466 static void ltk500hd1829_shutdown(struct mipi_dsi_device *dsi)
468 struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
471 ret = drm_panel_unprepare(&ctx->panel);
473 dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
475 ret = drm_panel_disable(&ctx->panel);
477 dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
480 static void ltk500hd1829_remove(struct mipi_dsi_device *dsi)
482 struct ltk500hd1829 *ctx = mipi_dsi_get_drvdata(dsi);
485 ltk500hd1829_shutdown(dsi);
487 ret = mipi_dsi_detach(dsi);
489 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
491 drm_panel_remove(&ctx->panel);
494 static const struct of_device_id ltk500hd1829_of_match[] = {
495 { .compatible = "leadtek,ltk500hd1829", },
498 MODULE_DEVICE_TABLE(of, ltk500hd1829_of_match);
500 static struct mipi_dsi_driver ltk500hd1829_driver = {
502 .name = "panel-leadtek-ltk500hd1829",
503 .of_match_table = ltk500hd1829_of_match,
505 .probe = ltk500hd1829_probe,
506 .remove = ltk500hd1829_remove,
507 .shutdown = ltk500hd1829_shutdown,
509 module_mipi_dsi_driver(ltk500hd1829_driver);
511 MODULE_AUTHOR("Heiko Stuebner <heiko.stuebner@theobroma-systems.com>");
512 MODULE_DESCRIPTION("Leadtek LTK500HD1829 panel driver");
513 MODULE_LICENSE("GPL v2");