1 /* 2 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; either version 2 of the License, or 7 * (at your option) any later version. 8 */ 9 10 #include <linux/backlight.h> 11 #include <linux/gpio/consumer.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/regulator/consumer.h> 15 16 #include <drm/drmP.h> 17 #include <drm/drm_crtc.h> 18 #include <drm/drm_mipi_dsi.h> 19 #include <drm/drm_panel.h> 20 21 #include <video/mipi_display.h> 22 23 struct innolux_panel { 24 struct drm_panel base; 25 struct mipi_dsi_device *link; 26 27 struct backlight_device *backlight; 28 struct regulator *supply; 29 struct gpio_desc *enable_gpio; 30 31 bool prepared; 32 bool enabled; 33 }; 34 35 static inline struct innolux_panel *to_innolux_panel(struct drm_panel *panel) 36 { 37 return container_of(panel, struct innolux_panel, base); 38 } 39 40 static int innolux_panel_disable(struct drm_panel *panel) 41 { 42 struct innolux_panel *innolux = to_innolux_panel(panel); 43 int err; 44 45 if (!innolux->enabled) 46 return 0; 47 48 backlight_disable(innolux->backlight); 49 50 err = mipi_dsi_dcs_set_display_off(innolux->link); 51 if (err < 0) 52 DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n", 53 err); 54 55 innolux->enabled = false; 56 57 return 0; 58 } 59 60 static int innolux_panel_unprepare(struct drm_panel *panel) 61 { 62 struct innolux_panel *innolux = to_innolux_panel(panel); 63 int err; 64 65 if (!innolux->prepared) 66 return 0; 67 68 err = mipi_dsi_dcs_enter_sleep_mode(innolux->link); 69 if (err < 0) { 70 DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n", 71 err); 72 return err; 73 } 74 75 gpiod_set_value_cansleep(innolux->enable_gpio, 0); 76 77 /* T8: 80ms - 1000ms */ 78 msleep(80); 79 80 err = regulator_disable(innolux->supply); 81 if (err < 0) 82 return err; 83 84 innolux->prepared = false; 85 86 return 0; 87 } 88 89 static int innolux_panel_prepare(struct drm_panel *panel) 90 { 91 struct innolux_panel *innolux = to_innolux_panel(panel); 92 int err, regulator_err; 93 94 if (innolux->prepared) 95 return 0; 96 97 gpiod_set_value_cansleep(innolux->enable_gpio, 0); 98 99 err = regulator_enable(innolux->supply); 100 if (err < 0) 101 return err; 102 103 /* T2: 15ms - 1000ms */ 104 usleep_range(15000, 16000); 105 106 gpiod_set_value_cansleep(innolux->enable_gpio, 1); 107 108 /* T4: 15ms - 1000ms */ 109 usleep_range(15000, 16000); 110 111 err = mipi_dsi_dcs_exit_sleep_mode(innolux->link); 112 if (err < 0) { 113 DRM_DEV_ERROR(panel->dev, "failed to exit sleep mode: %d\n", 114 err); 115 goto poweroff; 116 } 117 118 /* T6: 120ms - 1000ms*/ 119 msleep(120); 120 121 err = mipi_dsi_dcs_set_display_on(innolux->link); 122 if (err < 0) { 123 DRM_DEV_ERROR(panel->dev, "failed to set display on: %d\n", 124 err); 125 goto poweroff; 126 } 127 128 /* T7: 5ms */ 129 usleep_range(5000, 6000); 130 131 innolux->prepared = true; 132 133 return 0; 134 135 poweroff: 136 regulator_err = regulator_disable(innolux->supply); 137 if (regulator_err) 138 DRM_DEV_ERROR(panel->dev, "failed to disable regulator: %d\n", 139 regulator_err); 140 141 gpiod_set_value_cansleep(innolux->enable_gpio, 0); 142 return err; 143 } 144 145 static int innolux_panel_enable(struct drm_panel *panel) 146 { 147 struct innolux_panel *innolux = to_innolux_panel(panel); 148 int ret; 149 150 if (innolux->enabled) 151 return 0; 152 153 ret = backlight_enable(innolux->backlight); 154 if (ret) { 155 DRM_DEV_ERROR(panel->drm->dev, 156 "Failed to enable backlight %d\n", ret); 157 return ret; 158 } 159 160 innolux->enabled = true; 161 162 return 0; 163 } 164 165 static const struct drm_display_mode default_mode = { 166 .clock = 56900, 167 .hdisplay = 768, 168 .hsync_start = 768 + 40, 169 .hsync_end = 768 + 40 + 40, 170 .htotal = 768 + 40 + 40 + 40, 171 .vdisplay = 1024, 172 .vsync_start = 1024 + 20, 173 .vsync_end = 1024 + 20 + 4, 174 .vtotal = 1024 + 20 + 4 + 20, 175 .vrefresh = 60, 176 }; 177 178 static int innolux_panel_get_modes(struct drm_panel *panel) 179 { 180 struct drm_display_mode *mode; 181 182 mode = drm_mode_duplicate(panel->drm, &default_mode); 183 if (!mode) { 184 DRM_DEV_ERROR(panel->drm->dev, "failed to add mode %ux%ux@%u\n", 185 default_mode.hdisplay, default_mode.vdisplay, 186 default_mode.vrefresh); 187 return -ENOMEM; 188 } 189 190 drm_mode_set_name(mode); 191 192 drm_mode_probed_add(panel->connector, mode); 193 194 panel->connector->display_info.width_mm = 120; 195 panel->connector->display_info.height_mm = 160; 196 panel->connector->display_info.bpc = 8; 197 198 return 1; 199 } 200 201 static const struct drm_panel_funcs innolux_panel_funcs = { 202 .disable = innolux_panel_disable, 203 .unprepare = innolux_panel_unprepare, 204 .prepare = innolux_panel_prepare, 205 .enable = innolux_panel_enable, 206 .get_modes = innolux_panel_get_modes, 207 }; 208 209 static const struct of_device_id innolux_of_match[] = { 210 { .compatible = "innolux,p079zca", }, 211 { } 212 }; 213 MODULE_DEVICE_TABLE(of, innolux_of_match); 214 215 static int innolux_panel_add(struct innolux_panel *innolux) 216 { 217 struct device *dev = &innolux->link->dev; 218 int err; 219 220 innolux->supply = devm_regulator_get(dev, "power"); 221 if (IS_ERR(innolux->supply)) 222 return PTR_ERR(innolux->supply); 223 224 innolux->enable_gpio = devm_gpiod_get_optional(dev, "enable", 225 GPIOD_OUT_HIGH); 226 if (IS_ERR(innolux->enable_gpio)) { 227 err = PTR_ERR(innolux->enable_gpio); 228 dev_dbg(dev, "failed to get enable gpio: %d\n", err); 229 innolux->enable_gpio = NULL; 230 } 231 232 innolux->backlight = devm_of_find_backlight(dev); 233 234 if (IS_ERR(innolux->backlight)) 235 return PTR_ERR(innolux->backlight); 236 237 drm_panel_init(&innolux->base); 238 innolux->base.funcs = &innolux_panel_funcs; 239 innolux->base.dev = &innolux->link->dev; 240 241 return drm_panel_add(&innolux->base); 242 } 243 244 static void innolux_panel_del(struct innolux_panel *innolux) 245 { 246 if (innolux->base.dev) 247 drm_panel_remove(&innolux->base); 248 } 249 250 static int innolux_panel_probe(struct mipi_dsi_device *dsi) 251 { 252 struct innolux_panel *innolux; 253 int err; 254 255 dsi->lanes = 4; 256 dsi->format = MIPI_DSI_FMT_RGB888; 257 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE | 258 MIPI_DSI_MODE_LPM; 259 260 innolux = devm_kzalloc(&dsi->dev, sizeof(*innolux), GFP_KERNEL); 261 if (!innolux) 262 return -ENOMEM; 263 264 mipi_dsi_set_drvdata(dsi, innolux); 265 266 innolux->link = dsi; 267 268 err = innolux_panel_add(innolux); 269 if (err < 0) 270 return err; 271 272 err = mipi_dsi_attach(dsi); 273 return err; 274 } 275 276 static int innolux_panel_remove(struct mipi_dsi_device *dsi) 277 { 278 struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi); 279 int err; 280 281 err = innolux_panel_unprepare(&innolux->base); 282 if (err < 0) 283 DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n", 284 err); 285 286 err = innolux_panel_disable(&innolux->base); 287 if (err < 0) 288 DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err); 289 290 err = mipi_dsi_detach(dsi); 291 if (err < 0) 292 DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n", 293 err); 294 295 innolux_panel_del(innolux); 296 297 return 0; 298 } 299 300 static void innolux_panel_shutdown(struct mipi_dsi_device *dsi) 301 { 302 struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi); 303 304 innolux_panel_unprepare(&innolux->base); 305 innolux_panel_disable(&innolux->base); 306 } 307 308 static struct mipi_dsi_driver innolux_panel_driver = { 309 .driver = { 310 .name = "panel-innolux-p079zca", 311 .of_match_table = innolux_of_match, 312 }, 313 .probe = innolux_panel_probe, 314 .remove = innolux_panel_remove, 315 .shutdown = innolux_panel_shutdown, 316 }; 317 module_mipi_dsi_driver(innolux_panel_driver); 318 319 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>"); 320 MODULE_DESCRIPTION("Innolux P079ZCA panel driver"); 321 MODULE_LICENSE("GPL v2"); 322