1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2018-2019, Bridge Systems BV 4 * Copyright (C) 2018-2019, Bootlin 5 * Copyright (C) 2017, Free Electrons 6 * 7 * This file based on panel-ilitek-ili9881c.c 8 */ 9 10 #include <linux/backlight.h> 11 #include <linux/delay.h> 12 #include <linux/device.h> 13 #include <linux/err.h> 14 #include <linux/errno.h> 15 #include <linux/fb.h> 16 #include <linux/kernel.h> 17 #include <linux/media-bus-format.h> 18 #include <linux/module.h> 19 20 #include <linux/gpio/consumer.h> 21 #include <linux/regulator/consumer.h> 22 23 #include <drm/drm_connector.h> 24 #include <drm/drm_mipi_dsi.h> 25 #include <drm/drm_modes.h> 26 #include <drm/drm_panel.h> 27 #include <drm/drm_print.h> 28 29 struct rb070d30_panel { 30 struct drm_panel panel; 31 struct mipi_dsi_device *dsi; 32 struct backlight_device *backlight; 33 struct regulator *supply; 34 35 struct { 36 struct gpio_desc *power; 37 struct gpio_desc *reset; 38 struct gpio_desc *updn; 39 struct gpio_desc *shlr; 40 } gpios; 41 }; 42 43 static inline struct rb070d30_panel *panel_to_rb070d30_panel(struct drm_panel *panel) 44 { 45 return container_of(panel, struct rb070d30_panel, panel); 46 } 47 48 static int rb070d30_panel_prepare(struct drm_panel *panel) 49 { 50 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 51 int ret; 52 53 ret = regulator_enable(ctx->supply); 54 if (ret < 0) { 55 DRM_DEV_ERROR(&ctx->dsi->dev, "Failed to enable supply: %d\n", ret); 56 return ret; 57 } 58 59 msleep(20); 60 gpiod_set_value(ctx->gpios.power, 1); 61 msleep(20); 62 gpiod_set_value(ctx->gpios.reset, 1); 63 msleep(20); 64 return 0; 65 } 66 67 static int rb070d30_panel_unprepare(struct drm_panel *panel) 68 { 69 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 70 71 gpiod_set_value(ctx->gpios.reset, 0); 72 gpiod_set_value(ctx->gpios.power, 0); 73 regulator_disable(ctx->supply); 74 75 return 0; 76 } 77 78 static int rb070d30_panel_enable(struct drm_panel *panel) 79 { 80 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 81 int ret; 82 83 ret = mipi_dsi_dcs_exit_sleep_mode(ctx->dsi); 84 if (ret) 85 return ret; 86 87 ret = backlight_enable(ctx->backlight); 88 if (ret) 89 goto out; 90 91 return 0; 92 93 out: 94 mipi_dsi_dcs_enter_sleep_mode(ctx->dsi); 95 return ret; 96 } 97 98 static int rb070d30_panel_disable(struct drm_panel *panel) 99 { 100 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 101 102 backlight_disable(ctx->backlight); 103 return mipi_dsi_dcs_enter_sleep_mode(ctx->dsi); 104 } 105 106 /* Default timings */ 107 static const struct drm_display_mode default_mode = { 108 .clock = 51206, 109 .hdisplay = 1024, 110 .hsync_start = 1024 + 160, 111 .hsync_end = 1024 + 160 + 80, 112 .htotal = 1024 + 160 + 80 + 80, 113 .vdisplay = 600, 114 .vsync_start = 600 + 12, 115 .vsync_end = 600 + 12 + 10, 116 .vtotal = 600 + 12 + 10 + 13, 117 .vrefresh = 60, 118 119 .width_mm = 154, 120 .height_mm = 85, 121 }; 122 123 static int rb070d30_panel_get_modes(struct drm_panel *panel) 124 { 125 struct drm_connector *connector = panel->connector; 126 struct rb070d30_panel *ctx = panel_to_rb070d30_panel(panel); 127 struct drm_display_mode *mode; 128 static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; 129 130 mode = drm_mode_duplicate(panel->drm, &default_mode); 131 if (!mode) { 132 DRM_DEV_ERROR(&ctx->dsi->dev, 133 "Failed to add mode " DRM_MODE_FMT "\n", 134 DRM_MODE_ARG(&default_mode)); 135 return -EINVAL; 136 } 137 138 drm_mode_set_name(mode); 139 140 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 141 drm_mode_probed_add(connector, mode); 142 143 panel->connector->display_info.bpc = 8; 144 panel->connector->display_info.width_mm = mode->width_mm; 145 panel->connector->display_info.height_mm = mode->height_mm; 146 drm_display_info_set_bus_formats(&connector->display_info, 147 &bus_format, 1); 148 149 return 1; 150 } 151 152 static const struct drm_panel_funcs rb070d30_panel_funcs = { 153 .get_modes = rb070d30_panel_get_modes, 154 .prepare = rb070d30_panel_prepare, 155 .enable = rb070d30_panel_enable, 156 .disable = rb070d30_panel_disable, 157 .unprepare = rb070d30_panel_unprepare, 158 }; 159 160 static int rb070d30_panel_dsi_probe(struct mipi_dsi_device *dsi) 161 { 162 struct rb070d30_panel *ctx; 163 int ret; 164 165 ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL); 166 if (!ctx) 167 return -ENOMEM; 168 169 ctx->supply = devm_regulator_get(&dsi->dev, "vcc-lcd"); 170 if (IS_ERR(ctx->supply)) 171 return PTR_ERR(ctx->supply); 172 173 mipi_dsi_set_drvdata(dsi, ctx); 174 ctx->dsi = dsi; 175 176 drm_panel_init(&ctx->panel, &dsi->dev, &rb070d30_panel_funcs, 177 DRM_MODE_CONNECTOR_DSI); 178 179 ctx->gpios.reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW); 180 if (IS_ERR(ctx->gpios.reset)) { 181 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n"); 182 return PTR_ERR(ctx->gpios.reset); 183 } 184 185 ctx->gpios.power = devm_gpiod_get(&dsi->dev, "power", GPIOD_OUT_LOW); 186 if (IS_ERR(ctx->gpios.power)) { 187 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our power GPIO\n"); 188 return PTR_ERR(ctx->gpios.power); 189 } 190 191 /* 192 * We don't change the state of that GPIO later on but we need 193 * to force it into a low state. 194 */ 195 ctx->gpios.updn = devm_gpiod_get(&dsi->dev, "updn", GPIOD_OUT_LOW); 196 if (IS_ERR(ctx->gpios.updn)) { 197 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our updn GPIO\n"); 198 return PTR_ERR(ctx->gpios.updn); 199 } 200 201 /* 202 * We don't change the state of that GPIO later on but we need 203 * to force it into a low state. 204 */ 205 ctx->gpios.shlr = devm_gpiod_get(&dsi->dev, "shlr", GPIOD_OUT_LOW); 206 if (IS_ERR(ctx->gpios.shlr)) { 207 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our shlr GPIO\n"); 208 return PTR_ERR(ctx->gpios.shlr); 209 } 210 211 ctx->backlight = devm_of_find_backlight(&dsi->dev); 212 if (IS_ERR(ctx->backlight)) { 213 DRM_DEV_ERROR(&dsi->dev, "Couldn't get our backlight\n"); 214 return PTR_ERR(ctx->backlight); 215 } 216 217 ret = drm_panel_add(&ctx->panel); 218 if (ret < 0) 219 return ret; 220 221 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_LPM; 222 dsi->format = MIPI_DSI_FMT_RGB888; 223 dsi->lanes = 4; 224 225 return mipi_dsi_attach(dsi); 226 } 227 228 static int rb070d30_panel_dsi_remove(struct mipi_dsi_device *dsi) 229 { 230 struct rb070d30_panel *ctx = mipi_dsi_get_drvdata(dsi); 231 232 mipi_dsi_detach(dsi); 233 drm_panel_remove(&ctx->panel); 234 235 return 0; 236 } 237 238 static const struct of_device_id rb070d30_panel_of_match[] = { 239 { .compatible = "ronbo,rb070d30" }, 240 { /* sentinel */ }, 241 }; 242 MODULE_DEVICE_TABLE(of, rb070d30_panel_of_match); 243 244 static struct mipi_dsi_driver rb070d30_panel_driver = { 245 .probe = rb070d30_panel_dsi_probe, 246 .remove = rb070d30_panel_dsi_remove, 247 .driver = { 248 .name = "panel-ronbo-rb070d30", 249 .of_match_table = rb070d30_panel_of_match, 250 }, 251 }; 252 module_mipi_dsi_driver(rb070d30_panel_driver); 253 254 MODULE_AUTHOR("Boris Brezillon <boris.brezillon@bootlin.com>"); 255 MODULE_AUTHOR("Konstantin Sudakov <k.sudakov@integrasources.com>"); 256 MODULE_DESCRIPTION("Ronbo RB070D30 Panel Driver"); 257 MODULE_LICENSE("GPL"); 258