drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.c

   1 /*
   2  * Copyright (C) 2015 Red Hat
   3  * Copyright (C) 2015 Sony Mobile Communications Inc.
   4  * Author: Werner Johansson <werner.johansson@sonymobile.com>
   5  *
   6  * Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License version 2 as published by
  10  * the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  15  * more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along with
  18  * this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <linux/backlight.h>
  22 #include <linux/module.h>
  23 #include <linux/of.h>
  24 #include <linux/regulator/consumer.h>
  25
  26 #include <drm/drmP.h>
  27 #include <drm/drm_crtc.h>
  28 #include <drm/drm_mipi_dsi.h>
  29 #include <drm/drm_panel.h>
  30
  31 #include <video/mipi_display.h>
  32
  33 /*
  34  * When power is turned off to this panel a minimum off time of 500ms has to be
  35  * observed before powering back on as there's no external reset pin. Keep
  36  * track of earliest wakeup time and delay subsequent prepare call accordingly
  37  */
  38 #define MIN_POFF_MS (500)
  39
  40 struct wuxga_nt_panel {
  41         struct drm_panel base;
  42         struct mipi_dsi_device *dsi;
  43
  44         struct backlight_device *backlight;
  45         struct regulator *supply;
  46
  47         bool prepared;
  48         bool enabled;
  49
  50         ktime_t earliest_wake;
  51
  52         const struct drm_display_mode *mode;
  53 };
  54
  55 static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
  56 {
  57         return container_of(panel, struct wuxga_nt_panel, base);
  58 }
  59
  60 static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
  61 {
  62         return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
  63 }
  64
  65 static int wuxga_nt_panel_disable(struct drm_panel *panel)
  66 {
  67         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
  68         int mipi_ret, bl_ret = 0;
  69
  70         if (!wuxga_nt->enabled)
  71                 return 0;
  72
  73         mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
  74
  75         if (wuxga_nt->backlight) {
  76                 wuxga_nt->backlight->props.power = FB_BLANK_POWERDOWN;
  77                 wuxga_nt->backlight->props.state |= BL_CORE_FBBLANK;
  78                 bl_ret = backlight_update_status(wuxga_nt->backlight);
  79         }
  80
  81         wuxga_nt->enabled = false;
  82
  83         return mipi_ret ? mipi_ret : bl_ret;
  84 }
  85
  86 static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
  87 {
  88         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
  89
  90         if (!wuxga_nt->prepared)
  91                 return 0;
  92
  93         regulator_disable(wuxga_nt->supply);
  94         wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
  95         wuxga_nt->prepared = false;
  96
  97         return 0;
  98 }
  99
 100 static int wuxga_nt_panel_prepare(struct drm_panel *panel)
 101 {
 102         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 103         int ret;
 104         s64 enablewait;
 105
 106         if (wuxga_nt->prepared)
 107                 return 0;
 108
 109         /*
 110          * If the user re-enabled the panel before the required off-time then
 111          * we need to wait the remaining period before re-enabling regulator
 112          */
 113         enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
 114
 115         /* Sanity check, this should never happen */
 116         if (enablewait > MIN_POFF_MS)
 117                 enablewait = MIN_POFF_MS;
 118
 119         if (enablewait > 0)
 120                 msleep(enablewait);
 121
 122         ret = regulator_enable(wuxga_nt->supply);
 123         if (ret < 0)
 124                 return ret;
 125
 126         /*
 127          * A minimum delay of 250ms is required after power-up until commands
 128          * can be sent
 129          */
 130         msleep(250);
 131
 132         ret = wuxga_nt_panel_on(wuxga_nt);
 133         if (ret < 0) {
 134                 dev_err(panel->dev, "failed to set panel on: %d\n", ret);
 135                 goto poweroff;
 136         }
 137
 138         wuxga_nt->prepared = true;
 139
 140         return 0;
 141
 142 poweroff:
 143         regulator_disable(wuxga_nt->supply);
 144
 145         return ret;
 146 }
 147
 148 static int wuxga_nt_panel_enable(struct drm_panel *panel)
 149 {
 150         struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
 151
 152         if (wuxga_nt->enabled)
 153                 return 0;
 154
 155         if (wuxga_nt->backlight) {
 156                 wuxga_nt->backlight->props.power = FB_BLANK_UNBLANK;
 157                 wuxga_nt->backlight->props.state &= ~BL_CORE_FBBLANK;
 158                 backlight_update_status(wuxga_nt->backlight);
 159         }
 160
 161         wuxga_nt->enabled = true;
 162
 163         return 0;
 164 }
 165
 166 static const struct drm_display_mode default_mode = {
 167         .clock = 164402,
 168         .hdisplay = 1920,
 169         .hsync_start = 1920 + 152,
 170         .hsync_end = 1920 + 152 + 52,
 171         .htotal = 1920 + 152 + 52 + 20,
 172         .vdisplay = 1200,
 173         .vsync_start = 1200 + 24,
 174         .vsync_end = 1200 + 24 + 6,
 175         .vtotal = 1200 + 24 + 6 + 48,
 176         .vrefresh = 60,
 177 };
 178
 179 static int wuxga_nt_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                 dev_err(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 = 217;
 196         panel->connector->display_info.height_mm = 136;
 197
 198         return 1;
 199 }
 200
 201 static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
 202         .disable = wuxga_nt_panel_disable,
 203         .unprepare = wuxga_nt_panel_unprepare,
 204         .prepare = wuxga_nt_panel_prepare,
 205         .enable = wuxga_nt_panel_enable,
 206         .get_modes = wuxga_nt_panel_get_modes,
 207 };
 208
 209 static const struct of_device_id wuxga_nt_of_match[] = {
 210         { .compatible = "panasonic,vvx10f034n00", },
 211         { }
 212 };
 213 MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
 214
 215 static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
 216 {
 217         struct device *dev = &wuxga_nt->dsi->dev;
 218         struct device_node *np;
 219         int ret;
 220
 221         wuxga_nt->mode = &default_mode;
 222
 223         wuxga_nt->supply = devm_regulator_get(dev, "power");
 224         if (IS_ERR(wuxga_nt->supply))
 225                 return PTR_ERR(wuxga_nt->supply);
 226
 227         np = of_parse_phandle(dev->of_node, "backlight", 0);
 228         if (np) {
 229                 wuxga_nt->backlight = of_find_backlight_by_node(np);
 230                 of_node_put(np);
 231
 232                 if (!wuxga_nt->backlight)
 233                         return -EPROBE_DEFER;
 234         }
 235
 236         drm_panel_init(&wuxga_nt->base);
 237         wuxga_nt->base.funcs = &wuxga_nt_panel_funcs;
 238         wuxga_nt->base.dev = &wuxga_nt->dsi->dev;
 239
 240         ret = drm_panel_add(&wuxga_nt->base);
 241         if (ret < 0)
 242                 goto put_backlight;
 243
 244         return 0;
 245
 246 put_backlight:
 247         if (wuxga_nt->backlight)
 248                 put_device(&wuxga_nt->backlight->dev);
 249
 250         return ret;
 251 }
 252
 253 static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
 254 {
 255         if (wuxga_nt->base.dev)
 256                 drm_panel_remove(&wuxga_nt->base);
 257
 258         if (wuxga_nt->backlight)
 259                 put_device(&wuxga_nt->backlight->dev);
 260 }
 261
 262 static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
 263 {
 264         struct wuxga_nt_panel *wuxga_nt;
 265         int ret;
 266
 267         dsi->lanes = 4;
 268         dsi->format = MIPI_DSI_FMT_RGB888;
 269         dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
 270                         MIPI_DSI_MODE_VIDEO_HSE |
 271                         MIPI_DSI_CLOCK_NON_CONTINUOUS |
 272                         MIPI_DSI_MODE_LPM;
 273
 274         wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
 275         if (!wuxga_nt)
 276                 return -ENOMEM;
 277
 278         mipi_dsi_set_drvdata(dsi, wuxga_nt);
 279
 280         wuxga_nt->dsi = dsi;
 281
 282         ret = wuxga_nt_panel_add(wuxga_nt);
 283         if (ret < 0)
 284                 return ret;
 285
 286         return mipi_dsi_attach(dsi);
 287 }
 288
 289 static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
 290 {
 291         struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
 292         int ret;
 293
 294         ret = wuxga_nt_panel_disable(&wuxga_nt->base);
 295         if (ret < 0)
 296                 dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
 297
 298         ret = mipi_dsi_detach(dsi);
 299         if (ret < 0)
 300                 dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
 301
 302         wuxga_nt_panel_del(wuxga_nt);
 303
 304         return 0;
 305 }
 306
 307 static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
 308 {
 309         struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
 310
 311         wuxga_nt_panel_disable(&wuxga_nt->base);
 312 }
 313
 314 static struct mipi_dsi_driver wuxga_nt_panel_driver = {
 315         .driver = {
 316                 .name = "panel-panasonic-vvx10f034n00",
 317                 .of_match_table = wuxga_nt_of_match,
 318         },
 319         .probe = wuxga_nt_panel_probe,
 320         .remove = wuxga_nt_panel_remove,
 321         .shutdown = wuxga_nt_panel_shutdown,
 322 };
 323 module_mipi_dsi_driver(wuxga_nt_panel_driver);
 324
 325 MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
 326 MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
 327 MODULE_LICENSE("GPL v2");