drivers/gpu/drm/panel/panel-seiko-43wvf1g.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2017 NXP Semiconductors.
   4  * Author: Marco Franchi <marco.franchi@nxp.com>
   5  *
   6  * Based on Panel Simple driver by Thierry Reding <treding@nvidia.com>
   7  */
   8
   9 #include <linux/delay.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/regulator/consumer.h>
  14
  15 #include <video/display_timing.h>
  16 #include <video/videomode.h>
  17
  18 #include <drm/drm_crtc.h>
  19 #include <drm/drm_device.h>
  20 #include <drm/drm_panel.h>
  21
  22 struct seiko_panel_desc {
  23         const struct drm_display_mode *modes;
  24         unsigned int num_modes;
  25         const struct display_timing *timings;
  26         unsigned int num_timings;
  27
  28         unsigned int bpc;
  29
  30         /**
  31          * @width: width (in millimeters) of the panel's active display area
  32          * @height: height (in millimeters) of the panel's active display area
  33          */
  34         struct {
  35                 unsigned int width;
  36                 unsigned int height;
  37         } size;
  38
  39         u32 bus_format;
  40         u32 bus_flags;
  41 };
  42
  43 struct seiko_panel {
  44         struct drm_panel base;
  45         bool prepared;
  46         bool enabled;
  47         const struct seiko_panel_desc *desc;
  48         struct regulator *dvdd;
  49         struct regulator *avdd;
  50 };
  51
  52 static inline struct seiko_panel *to_seiko_panel(struct drm_panel *panel)
  53 {
  54         return container_of(panel, struct seiko_panel, base);
  55 }
  56
  57 static int seiko_panel_get_fixed_modes(struct seiko_panel *panel,
  58                                        struct drm_connector *connector)
  59 {
  60         struct drm_display_mode *mode;
  61         unsigned int i, num = 0;
  62
  63         if (!panel->desc)
  64                 return 0;
  65
  66         for (i = 0; i < panel->desc->num_timings; i++) {
  67                 const struct display_timing *dt = &panel->desc->timings[i];
  68                 struct videomode vm;
  69
  70                 videomode_from_timing(dt, &vm);
  71                 mode = drm_mode_create(connector->dev);
  72                 if (!mode) {
  73                         dev_err(panel->base.dev, "failed to add mode %ux%u\n",
  74                                 dt->hactive.typ, dt->vactive.typ);
  75                         continue;
  76                 }
  77
  78                 drm_display_mode_from_videomode(&vm, mode);
  79
  80                 mode->type |= DRM_MODE_TYPE_DRIVER;
  81
  82                 if (panel->desc->num_timings == 1)
  83                         mode->type |= DRM_MODE_TYPE_PREFERRED;
  84
  85                 drm_mode_probed_add(connector, mode);
  86                 num++;
  87         }
  88
  89         for (i = 0; i < panel->desc->num_modes; i++) {
  90                 const struct drm_display_mode *m = &panel->desc->modes[i];
  91
  92                 mode = drm_mode_duplicate(connector->dev, m);
  93                 if (!mode) {
  94                         dev_err(panel->base.dev, "failed to add mode %ux%u@%u\n",
  95                                 m->hdisplay, m->vdisplay,
  96                                 drm_mode_vrefresh(m));
  97                         continue;
  98                 }
  99
 100                 mode->type |= DRM_MODE_TYPE_DRIVER;
 101
 102                 if (panel->desc->num_modes == 1)
 103                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 104
 105                 drm_mode_set_name(mode);
 106
 107                 drm_mode_probed_add(connector, mode);
 108                 num++;
 109         }
 110
 111         connector->display_info.bpc = panel->desc->bpc;
 112         connector->display_info.width_mm = panel->desc->size.width;
 113         connector->display_info.height_mm = panel->desc->size.height;
 114         if (panel->desc->bus_format)
 115                 drm_display_info_set_bus_formats(&connector->display_info,
 116                                                  &panel->desc->bus_format, 1);
 117         connector->display_info.bus_flags = panel->desc->bus_flags;
 118
 119         return num;
 120 }
 121
 122 static int seiko_panel_disable(struct drm_panel *panel)
 123 {
 124         struct seiko_panel *p = to_seiko_panel(panel);
 125
 126         if (!p->enabled)
 127                 return 0;
 128
 129         p->enabled = false;
 130
 131         return 0;
 132 }
 133
 134 static int seiko_panel_unprepare(struct drm_panel *panel)
 135 {
 136         struct seiko_panel *p = to_seiko_panel(panel);
 137
 138         if (!p->prepared)
 139                 return 0;
 140
 141         regulator_disable(p->avdd);
 142
 143         /* Add a 100ms delay as per the panel datasheet */
 144         msleep(100);
 145
 146         regulator_disable(p->dvdd);
 147
 148         p->prepared = false;
 149
 150         return 0;
 151 }
 152
 153 static int seiko_panel_prepare(struct drm_panel *panel)
 154 {
 155         struct seiko_panel *p = to_seiko_panel(panel);
 156         int err;
 157
 158         if (p->prepared)
 159                 return 0;
 160
 161         err = regulator_enable(p->dvdd);
 162         if (err < 0) {
 163                 dev_err(panel->dev, "failed to enable dvdd: %d\n", err);
 164                 return err;
 165         }
 166
 167         /* Add a 100ms delay as per the panel datasheet */
 168         msleep(100);
 169
 170         err = regulator_enable(p->avdd);
 171         if (err < 0) {
 172                 dev_err(panel->dev, "failed to enable avdd: %d\n", err);
 173                 goto disable_dvdd;
 174         }
 175
 176         p->prepared = true;
 177
 178         return 0;
 179
 180 disable_dvdd:
 181         regulator_disable(p->dvdd);
 182         return err;
 183 }
 184
 185 static int seiko_panel_enable(struct drm_panel *panel)
 186 {
 187         struct seiko_panel *p = to_seiko_panel(panel);
 188
 189         if (p->enabled)
 190                 return 0;
 191
 192         p->enabled = true;
 193
 194         return 0;
 195 }
 196
 197 static int seiko_panel_get_modes(struct drm_panel *panel,
 198                                  struct drm_connector *connector)
 199 {
 200         struct seiko_panel *p = to_seiko_panel(panel);
 201
 202         /* add hard-coded panel modes */
 203         return seiko_panel_get_fixed_modes(p, connector);
 204 }
 205
 206 static int seiko_panel_get_timings(struct drm_panel *panel,
 207                                     unsigned int num_timings,
 208                                     struct display_timing *timings)
 209 {
 210         struct seiko_panel *p = to_seiko_panel(panel);
 211         unsigned int i;
 212
 213         if (p->desc->num_timings < num_timings)
 214                 num_timings = p->desc->num_timings;
 215
 216         if (timings)
 217                 for (i = 0; i < num_timings; i++)
 218                         timings[i] = p->desc->timings[i];
 219
 220         return p->desc->num_timings;
 221 }
 222
 223 static const struct drm_panel_funcs seiko_panel_funcs = {
 224         .disable = seiko_panel_disable,
 225         .unprepare = seiko_panel_unprepare,
 226         .prepare = seiko_panel_prepare,
 227         .enable = seiko_panel_enable,
 228         .get_modes = seiko_panel_get_modes,
 229         .get_timings = seiko_panel_get_timings,
 230 };
 231
 232 static int seiko_panel_probe(struct device *dev,
 233                                         const struct seiko_panel_desc *desc)
 234 {
 235         struct seiko_panel *panel;
 236         int err;
 237
 238         panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
 239         if (!panel)
 240                 return -ENOMEM;
 241
 242         panel->enabled = false;
 243         panel->prepared = false;
 244         panel->desc = desc;
 245
 246         panel->dvdd = devm_regulator_get(dev, "dvdd");
 247         if (IS_ERR(panel->dvdd))
 248                 return PTR_ERR(panel->dvdd);
 249
 250         panel->avdd = devm_regulator_get(dev, "avdd");
 251         if (IS_ERR(panel->avdd))
 252                 return PTR_ERR(panel->avdd);
 253
 254         drm_panel_init(&panel->base, dev, &seiko_panel_funcs,
 255                        DRM_MODE_CONNECTOR_DPI);
 256
 257         err = drm_panel_of_backlight(&panel->base);
 258         if (err)
 259                 return err;
 260
 261         drm_panel_add(&panel->base);
 262
 263         dev_set_drvdata(dev, panel);
 264
 265         return 0;
 266 }
 267
 268 static int seiko_panel_remove(struct platform_device *pdev)
 269 {
 270         struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
 271
 272         drm_panel_remove(&panel->base);
 273         drm_panel_disable(&panel->base);
 274
 275         return 0;
 276 }
 277
 278 static void seiko_panel_shutdown(struct platform_device *pdev)
 279 {
 280         struct seiko_panel *panel = dev_get_drvdata(&pdev->dev);
 281
 282         drm_panel_disable(&panel->base);
 283 }
 284
 285 static const struct display_timing seiko_43wvf1g_timing = {
 286         .pixelclock = { 33500000, 33500000, 33500000 },
 287         .hactive = { 800, 800, 800 },
 288         .hfront_porch = {  164, 164, 164 },
 289         .hback_porch = { 89, 89, 89 },
 290         .hsync_len = { 10, 10, 10 },
 291         .vactive = { 480, 480, 480 },
 292         .vfront_porch = { 10, 10, 10 },
 293         .vback_porch = { 23, 23, 23 },
 294         .vsync_len = { 10, 10, 10 },
 295         .flags = DISPLAY_FLAGS_DE_LOW,
 296 };
 297
 298 static const struct seiko_panel_desc seiko_43wvf1g = {
 299         .timings = &seiko_43wvf1g_timing,
 300         .num_timings = 1,
 301         .bpc = 8,
 302         .size = {
 303                 .width = 93,
 304                 .height = 57,
 305         },
 306         .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 307         .bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE,
 308 };
 309
 310 static const struct of_device_id platform_of_match[] = {
 311         {
 312                 .compatible = "sii,43wvf1g",
 313                 .data = &seiko_43wvf1g,
 314         }, {
 315                 /* sentinel */
 316         }
 317 };
 318 MODULE_DEVICE_TABLE(of, platform_of_match);
 319
 320 static int seiko_panel_platform_probe(struct platform_device *pdev)
 321 {
 322         const struct of_device_id *id;
 323
 324         id = of_match_node(platform_of_match, pdev->dev.of_node);
 325         if (!id)
 326                 return -ENODEV;
 327
 328         return seiko_panel_probe(&pdev->dev, id->data);
 329 }
 330
 331 static struct platform_driver seiko_panel_platform_driver = {
 332         .driver = {
 333                 .name = "seiko_panel",
 334                 .of_match_table = platform_of_match,
 335         },
 336         .probe = seiko_panel_platform_probe,
 337         .remove = seiko_panel_remove,
 338         .shutdown = seiko_panel_shutdown,
 339 };
 340 module_platform_driver(seiko_panel_platform_driver);
 341
 342 MODULE_AUTHOR("Marco Franchi <marco.franchi@nxp.com>");
 343 MODULE_DESCRIPTION("Seiko 43WVF1G panel driver");
 344 MODULE_LICENSE("GPL v2");