1 /* 2 * rcar_du_crtc.c -- R-Car Display Unit CRTCs 3 * 4 * Copyright (C) 2016 Laurent Pinchart 5 * Copyright (C) 2016 Renesas Electronics Corporation 6 * 7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) 8 * 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. 13 */ 14 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> 21 22 #include <drm/drmP.h> 23 #include <drm/drm_crtc.h> 24 #include <drm/drm_panel.h> 25 26 #include <video/display_timing.h> 27 #include <video/of_display_timing.h> 28 #include <video/videomode.h> 29 30 struct panel_lvds { 31 struct drm_panel panel; 32 struct device *dev; 33 34 const char *label; 35 unsigned int width; 36 unsigned int height; 37 struct videomode video_mode; 38 unsigned int bus_format; 39 bool data_mirror; 40 41 struct backlight_device *backlight; 42 43 struct gpio_desc *enable_gpio; 44 struct gpio_desc *reset_gpio; 45 }; 46 47 static inline struct panel_lvds *to_panel_lvds(struct drm_panel *panel) 48 { 49 return container_of(panel, struct panel_lvds, panel); 50 } 51 52 static int panel_lvds_disable(struct drm_panel *panel) 53 { 54 struct panel_lvds *lvds = to_panel_lvds(panel); 55 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); 60 } 61 62 return 0; 63 } 64 65 static int panel_lvds_unprepare(struct drm_panel *panel) 66 { 67 struct panel_lvds *lvds = to_panel_lvds(panel); 68 69 if (lvds->enable_gpio) 70 gpiod_set_value_cansleep(lvds->enable_gpio, 0); 71 72 return 0; 73 } 74 75 static int panel_lvds_prepare(struct drm_panel *panel) 76 { 77 struct panel_lvds *lvds = to_panel_lvds(panel); 78 79 if (lvds->enable_gpio) 80 gpiod_set_value_cansleep(lvds->enable_gpio, 1); 81 82 return 0; 83 } 84 85 static int panel_lvds_enable(struct drm_panel *panel) 86 { 87 struct panel_lvds *lvds = to_panel_lvds(panel); 88 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); 93 } 94 95 return 0; 96 } 97 98 static int panel_lvds_get_modes(struct drm_panel *panel) 99 { 100 struct panel_lvds *lvds = to_panel_lvds(panel); 101 struct drm_connector *connector = lvds->panel.connector; 102 struct drm_display_mode *mode; 103 104 mode = drm_mode_create(lvds->panel.drm); 105 if (!mode) 106 return 0; 107 108 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); 111 112 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; 119 120 return 1; 121 } 122 123 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, 129 }; 130 131 static int panel_lvds_parse_dt(struct panel_lvds *lvds) 132 { 133 struct device_node *np = lvds->dev->of_node; 134 struct display_timing timing; 135 const char *mapping; 136 int ret; 137 138 ret = of_get_display_timing(np, "panel-timing", &timing); 139 if (ret < 0) 140 return ret; 141 142 videomode_from_timing(&timing, &lvds->video_mode); 143 144 ret = of_property_read_u32(np, "width-mm", &lvds->width); 145 if (ret < 0) { 146 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", 147 np, "width-mm"); 148 return -ENODEV; 149 } 150 ret = of_property_read_u32(np, "height-mm", &lvds->height); 151 if (ret < 0) { 152 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", 153 np, "height-mm"); 154 return -ENODEV; 155 } 156 157 of_property_read_string(np, "label", &lvds->label); 158 159 ret = of_property_read_string(np, "data-mapping", &mapping); 160 if (ret < 0) { 161 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", 162 np, "data-mapping"); 163 return -ENODEV; 164 } 165 166 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; 172 } else { 173 dev_err(lvds->dev, "%pOF: invalid or missing %s DT property\n", 174 np, "data-mapping"); 175 return -EINVAL; 176 } 177 178 lvds->data_mirror = of_property_read_bool(np, "data-mirror"); 179 180 return 0; 181 } 182 183 static int panel_lvds_probe(struct platform_device *pdev) 184 { 185 struct panel_lvds *lvds; 186 struct device_node *np; 187 int ret; 188 189 lvds = devm_kzalloc(&pdev->dev, sizeof(*lvds), GFP_KERNEL); 190 if (!lvds) 191 return -ENOMEM; 192 193 lvds->dev = &pdev->dev; 194 195 ret = panel_lvds_parse_dt(lvds); 196 if (ret < 0) 197 return ret; 198 199 /* Get GPIOs and backlight controller. */ 200 lvds->enable_gpio = devm_gpiod_get_optional(lvds->dev, "enable", 201 GPIOD_OUT_LOW); 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", 205 "enable", ret); 206 return ret; 207 } 208 209 lvds->reset_gpio = devm_gpiod_get_optional(lvds->dev, "reset", 210 GPIOD_OUT_HIGH); 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", 214 "reset", ret); 215 return ret; 216 } 217 218 np = of_parse_phandle(lvds->dev->of_node, "backlight", 0); 219 if (np) { 220 lvds->backlight = of_find_backlight_by_node(np); 221 of_node_put(np); 222 223 if (!lvds->backlight) 224 return -EPROBE_DEFER; 225 } 226 227 /* 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 231 * driver. 232 */ 233 234 /* Register the panel. */ 235 drm_panel_init(&lvds->panel); 236 lvds->panel.dev = lvds->dev; 237 lvds->panel.funcs = &panel_lvds_funcs; 238 239 ret = drm_panel_add(&lvds->panel); 240 if (ret < 0) 241 goto error; 242 243 dev_set_drvdata(lvds->dev, lvds); 244 return 0; 245 246 error: 247 put_device(&lvds->backlight->dev); 248 return ret; 249 } 250 251 static int panel_lvds_remove(struct platform_device *pdev) 252 { 253 struct panel_lvds *lvds = dev_get_drvdata(&pdev->dev); 254 255 drm_panel_detach(&lvds->panel); 256 drm_panel_remove(&lvds->panel); 257 258 panel_lvds_disable(&lvds->panel); 259 260 if (lvds->backlight) 261 put_device(&lvds->backlight->dev); 262 263 return 0; 264 } 265 266 static const struct of_device_id panel_lvds_of_table[] = { 267 { .compatible = "panel-lvds", }, 268 { /* Sentinel */ }, 269 }; 270 271 MODULE_DEVICE_TABLE(of, panel_lvds_of_table); 272 273 static struct platform_driver panel_lvds_driver = { 274 .probe = panel_lvds_probe, 275 .remove = panel_lvds_remove, 276 .driver = { 277 .name = "panel-lvds", 278 .of_match_table = panel_lvds_of_table, 279 }, 280 }; 281 282 module_platform_driver(panel_lvds_driver); 283 284 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>"); 285 MODULE_DESCRIPTION("LVDS Panel Driver"); 286 MODULE_LICENSE("GPL"); 287