drivers/gpu/drm/panel/panel-innolux-p079zca.c

   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
  44         if (!innolux->enabled)
  45                 return 0;
  46
  47         innolux->backlight->props.power = FB_BLANK_POWERDOWN;
  48         backlight_update_status(innolux->backlight);
  49
  50         innolux->enabled = false;
  51
  52         return 0;
  53 }
  54
  55 static int innolux_panel_unprepare(struct drm_panel *panel)
  56 {
  57         struct innolux_panel *innolux = to_innolux_panel(panel);
  58         int err;
  59
  60         if (!innolux->prepared)
  61                 return 0;
  62
  63         err = mipi_dsi_dcs_set_display_off(innolux->link);
  64         if (err < 0)
  65                 DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n",
  66                               err);
  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         innolux->backlight->props.power = FB_BLANK_UNBLANK;
 154         ret = backlight_update_status(innolux->backlight);
 155         if (ret) {
 156                 DRM_DEV_ERROR(panel->drm->dev,
 157                               "Failed to enable backlight %d\n", ret);
 158                 return ret;
 159         }
 160
 161         innolux->enabled = true;
 162
 163         return 0;
 164 }
 165
 166 static const struct drm_display_mode default_mode = {
 167         .clock = 56900,
 168         .hdisplay = 768,
 169         .hsync_start = 768 + 40,
 170         .hsync_end = 768 + 40 + 40,
 171         .htotal = 768 + 40 + 40 + 40,
 172         .vdisplay = 1024,
 173         .vsync_start = 1024 + 20,
 174         .vsync_end = 1024 + 20 + 4,
 175         .vtotal = 1024 + 20 + 4 + 20,
 176         .vrefresh = 60,
 177 };
 178
 179 static int innolux_panel_get_modes(struct drm_panel *panel)
 180 {
 181         struct drm_display_mode *mode;
 182
 183         mode = drm_mode_duplicate(panel->drm, &default_mode);
 184         if (!mode) {
 185                 DRM_DEV_ERROR(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
 186                               default_mode.hdisplay, default_mode.vdisplay,
 187                               default_mode.vrefresh);
 188                 return -ENOMEM;
 189         }
 190
 191         drm_mode_set_name(mode);
 192
 193         drm_mode_probed_add(panel->connector, mode);
 194
 195         panel->connector->display_info.width_mm = 120;
 196         panel->connector->display_info.height_mm = 160;
 197         panel->connector->display_info.bpc = 8;
 198
 199         return 1;
 200 }
 201
 202 static const struct drm_panel_funcs innolux_panel_funcs = {
 203         .disable = innolux_panel_disable,
 204         .unprepare = innolux_panel_unprepare,
 205         .prepare = innolux_panel_prepare,
 206         .enable = innolux_panel_enable,
 207         .get_modes = innolux_panel_get_modes,
 208 };
 209
 210 static const struct of_device_id innolux_of_match[] = {
 211         { .compatible = "innolux,p079zca", },
 212         { }
 213 };
 214 MODULE_DEVICE_TABLE(of, innolux_of_match);
 215
 216 static int innolux_panel_add(struct innolux_panel *innolux)
 217 {
 218         struct device *dev = &innolux->link->dev;
 219         struct device_node *np;
 220         int err;
 221
 222         innolux->supply = devm_regulator_get(dev, "power");
 223         if (IS_ERR(innolux->supply))
 224                 return PTR_ERR(innolux->supply);
 225
 226         innolux->enable_gpio = devm_gpiod_get_optional(dev, "enable",
 227                                                        GPIOD_OUT_HIGH);
 228         if (IS_ERR(innolux->enable_gpio)) {
 229                 err = PTR_ERR(innolux->enable_gpio);
 230                 dev_dbg(dev, "failed to get enable gpio: %d\n", err);
 231                 innolux->enable_gpio = NULL;
 232         }
 233
 234         np = of_parse_phandle(dev->of_node, "backlight", 0);
 235         if (np) {
 236                 innolux->backlight = of_find_backlight_by_node(np);
 237                 of_node_put(np);
 238
 239                 if (!innolux->backlight)
 240                         return -EPROBE_DEFER;
 241         }
 242
 243         drm_panel_init(&innolux->base);
 244         innolux->base.funcs = &innolux_panel_funcs;
 245         innolux->base.dev = &innolux->link->dev;
 246
 247         err = drm_panel_add(&innolux->base);
 248         if (err < 0)
 249                 goto put_backlight;
 250
 251         return 0;
 252
 253 put_backlight:
 254         put_device(&innolux->backlight->dev);
 255
 256         return err;
 257 }
 258
 259 static void innolux_panel_del(struct innolux_panel *innolux)
 260 {
 261         if (innolux->base.dev)
 262                 drm_panel_remove(&innolux->base);
 263
 264         put_device(&innolux->backlight->dev);
 265 }
 266
 267 static int innolux_panel_probe(struct mipi_dsi_device *dsi)
 268 {
 269         struct innolux_panel *innolux;
 270         int err;
 271
 272         dsi->lanes = 4;
 273         dsi->format = MIPI_DSI_FMT_RGB888;
 274         dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
 275                           MIPI_DSI_MODE_LPM;
 276
 277         innolux = devm_kzalloc(&dsi->dev, sizeof(*innolux), GFP_KERNEL);
 278         if (!innolux)
 279                 return -ENOMEM;
 280
 281         mipi_dsi_set_drvdata(dsi, innolux);
 282
 283         innolux->link = dsi;
 284
 285         err = innolux_panel_add(innolux);
 286         if (err < 0)
 287                 return err;
 288
 289         err = mipi_dsi_attach(dsi);
 290         return err;
 291 }
 292
 293 static int innolux_panel_remove(struct mipi_dsi_device *dsi)
 294 {
 295         struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
 296         int err;
 297
 298         err = innolux_panel_unprepare(&innolux->base);
 299         if (err < 0)
 300                 DRM_DEV_ERROR(&dsi->dev, "failed to unprepare panel: %d\n",
 301                               err);
 302
 303         err = innolux_panel_disable(&innolux->base);
 304         if (err < 0)
 305                 DRM_DEV_ERROR(&dsi->dev, "failed to disable panel: %d\n", err);
 306
 307         err = mipi_dsi_detach(dsi);
 308         if (err < 0)
 309                 DRM_DEV_ERROR(&dsi->dev, "failed to detach from DSI host: %d\n",
 310                               err);
 311
 312         drm_panel_detach(&innolux->base);
 313         innolux_panel_del(innolux);
 314
 315         return 0;
 316 }
 317
 318 static void innolux_panel_shutdown(struct mipi_dsi_device *dsi)
 319 {
 320         struct innolux_panel *innolux = mipi_dsi_get_drvdata(dsi);
 321
 322         innolux_panel_unprepare(&innolux->base);
 323         innolux_panel_disable(&innolux->base);
 324 }
 325
 326 static struct mipi_dsi_driver innolux_panel_driver = {
 327         .driver = {
 328                 .name = "panel-innolux-p079zca",
 329                 .of_match_table = innolux_of_match,
 330         },
 331         .probe = innolux_panel_probe,
 332         .remove = innolux_panel_remove,
 333         .shutdown = innolux_panel_shutdown,
 334 };
 335 module_mipi_dsi_driver(innolux_panel_driver);
 336
 337 MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
 338 MODULE_DESCRIPTION("Innolux P079ZCA panel driver");
 339 MODULE_LICENSE("GPL v2");