2 * rcar_du_crtc.c -- R-Car Display Unit CRTCs
4 * Copyright (C) 2016 Laurent Pinchart
5 * Copyright (C) 2016 Renesas Electronics Corporation
7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
15 #include <linux/backlight.h>
16 #include <linux/gpio/consumer.h>
17 #include <linux/module.h>
18 #include <linux/of_platform.h>
19 #include <linux/platform_device.h>
20 #include <linux/slab.h>
23 #include <drm/drm_crtc.h>
24 #include <drm/drm_panel.h>
26 #include <video/display_timing.h>
27 #include <video/of_display_timing.h>
28 #include <video/videomode.h>
31 struct drm_panel panel;
37 struct videomode video_mode;
38 unsigned int bus_format;
41 struct backlight_device *backlight;
43 struct gpio_desc *enable_gpio;
44 struct gpio_desc *reset_gpio;
47 static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel)
49 return container_of(panel, struct panel_lvds, panel);
52 static int panel_lvds_disable(struct drm_panel *panel)
54 struct panel_lvds *lvds = to_panel_lvds(panel);
56 if (lvds->backlight) {
57 lvds->backlight->props.power = FB_BLANK_POWERDOWN;
58 lvds->backlight->props.state |= BL_CORE_FBBLANK;
59 backlight_update_status(lvds->backlight);
65 static int panel_lvds_unprepare(struct drm_panel *panel)
67 struct panel_lvds *lvds = to_panel_lvds(panel);
69 if (lvds->enable_gpio)
70 gpiod_set_value_cansleep(lvds->enable_gpio, 0);
75 static int panel_lvds_prepare(struct drm_panel *panel)
77 struct panel_lvds *lvds = to_panel_lvds(panel);
79 if (lvds->enable_gpio)
80 gpiod_set_value_cansleep(lvds->enable_gpio, 1);
85 static int panel_lvds_enable(struct drm_panel *panel)
87 struct panel_lvds *lvds = to_panel_lvds(panel);
89 if (lvds->backlight) {
90 lvds->backlight->props.state &= ~BL_CORE_FBBLANK;
91 lvds->backlight->props.power = FB_BLANK_UNBLANK;
92 backlight_update_status(lvds->backlight);
98 static int panel_lvds_get_modes(struct drm_panel *panel)
100 struct panel_lvds *lvds = to_panel_lvds(panel);
101 struct drm_connector *connector = lvds->panel.connector;
102 struct drm_display_mode *mode;
104 mode = drm_mode_create(lvds->panel.drm);
108 drm_display_mode_from_videomode(&lvds->video_mode, mode);
109 mode->type |= DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
110 drm_mode_probed_add(connector, mode);
112 connector->display_info.width_mm = lvds->width;
113 connector->display_info.height_mm = lvds->height;
114 drm_display_info_set_bus_formats(&connector->display_info,
115 &lvds->bus_format, 1);
116 connector->display_info.bus_flags = lvds->data_mirror
117 ? DRM_BUS_FLAG_DATA_LSB_TO_MSB
118 : DRM_BUS_FLAG_DATA_MSB_TO_LSB;
123 static const struct drm_panel_funcs panel_lvds_funcs = {
124 .disable = panel_lvds_disable,
125 .unprepare = panel_lvds_unprepare,
126 .prepare = panel_lvds_prepare,
127 .enable = panel_lvds_enable,
128 .get_modes = panel_lvds_get_modes,
131 static int panel_lvds_parse_dt(struct panel_lvds *lvds)
133 struct device_node *np = lvds->dev->of_node;
134 struct display_timing timing;
138 ret = of_get_display_timing(np, "panel-timing", &timing);
142 videomode_from_timing(&timing, &lvds->video_mode);
144 ret = of_property_read_u32(np, "width-mm", &lvds->width);
146 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
150 ret = of_property_read_u32(np, "height-mm", &lvds->height);
152 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
157 of_property_read_string(np, "label", &lvds->label);
159 ret = of_property_read_string(np, "data-mapping", &mapping);
161 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
166 if (!strcmp(mapping, "jeida-18")) {
167 lvds->bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG;
168 } else if (!strcmp(mapping, "jeida-24")) {
169 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA;
170 } else if (!strcmp(mapping, "vesa-24")) {
171 lvds->bus_format = MEDIA_BUS_FMT_RGB888_1X7X4_SPWG;
173 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n",
178 lvds->data_mirror = of_property_read_bool(np, "data-mirror");
183 static int panel_lvds_probe(struct platform_device *pdev)
185 struct panel_lvds *lvds;
186 struct device_node *np;
189 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL);
193 lvds->dev = &pdev->dev;
195 ret = panel_lvds_parse_dt(lvds);
199 /* Get GPIOs and backlight controller. */
200 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable",
202 if (IS_ERR(lvds->enable_gpio)) {
203 ret = PTR_ERR(lvds->enable_gpio);
204 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
209 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset",
211 if (IS_ERR(lvds->reset_gpio)) {
212 ret = PTR_ERR(lvds->reset_gpio);
213 dev_err(lvds->dev, "failed to request %s GPIO: %d\n",
218 np = of_parse_phandle(lvds->dev->of_node, "backlight", 0);
220 lvds->backlight = of_find_backlight_by_node(np);
223 if (!lvds->backlight)
224 return -EPROBE_DEFER;
228 * TODO: Handle all power supplies specified in the DT node in a generic
229 * way for panels that don't care about power supply ordering. LVDS
230 * panels that require a specific power sequence will need a dedicated
234 /* Register the panel. */
235 drm_panel_init(&lvds->panel);
236 lvds->panel.dev = lvds->dev;
237 lvds->panel.funcs = &panel_lvds_funcs;
239 ret = drm_panel_add(&lvds->panel);
243 dev_set_drvdata(lvds->dev, lvds);
247 put_device(&lvds->backlight->dev);
251 static int panel_lvds_remove(struct platform_device *pdev)
253 struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev);
255 drm_panel_detach(&lvds->panel);
256 drm_panel_remove(&lvds->panel);
258 panel_lvds_disable(&lvds->panel);
261 put_device(&lvds->backlight->dev);
266 static const struct of_device_id panel_lvds_of_table[] = {
267 { .compatible = "panel-lvds", },
271 MODULE_DEVICE_TABLE(of, panel_lvds_of_table);
273 static struct platform_driver panel_lvds_driver = {
274 .probe = panel_lvds_probe,
275 .remove = panel_lvds_remove,
277 .name = "panel-lvds",
278 .of_match_table = panel_lvds_of_table,
282 module_platform_driver(panel_lvds_driver);
284 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
285 MODULE_DESCRIPTION("LVDS Panel Driver");
286 MODULE_LICENSE("GPL");