drivers/gpu/drm/tilcdc/tilcdc_panel.c

   1 /*
   2  * Copyright (C) 2012 Texas Instruments
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <linux/pinctrl/pinmux.h>
  19 #include <linux/pinctrl/consumer.h>
  20 #include <linux/backlight.h>
  21 #include <linux/gpio/consumer.h>
  22 #include <video/display_timing.h>
  23 #include <video/of_display_timing.h>
  24 #include <video/videomode.h>
  25 #include <drm/drm_atomic_helper.h>
  26 #include <drm/drm_probe_helper.h>
  27
  28 #include "tilcdc_drv.h"
  29 #include "tilcdc_panel.h"
  30
  31 struct panel_module {
  32         struct tilcdc_module base;
  33         struct tilcdc_panel_info *info;
  34         struct display_timings *timings;
  35         struct backlight_device *backlight;
  36         struct gpio_desc *enable_gpio;
  37 };
  38 #define to_panel_module(x) container_of(x, struct panel_module, base)
  39
  40
  41 /*
  42  * Encoder:
  43  */
  44
  45 struct panel_encoder {
  46         struct drm_encoder base;
  47         struct panel_module *mod;
  48 };
  49 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  50
  51 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  52 {
  53         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  54         struct backlight_device *backlight = panel_encoder->mod->backlight;
  55         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  56
  57         if (backlight) {
  58                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  59                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  60                 backlight_update_status(backlight);
  61         }
  62
  63         if (gpio)
  64                 gpiod_set_value_cansleep(gpio,
  65                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
  66 }
  67
  68 static void panel_encoder_prepare(struct drm_encoder *encoder)
  69 {
  70         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  71 }
  72
  73 static void panel_encoder_commit(struct drm_encoder *encoder)
  74 {
  75         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  76 }
  77
  78 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  79                 struct drm_display_mode *mode,
  80                 struct drm_display_mode *adjusted_mode)
  81 {
  82         /* nothing needed */
  83 }
  84
  85 static const struct drm_encoder_funcs panel_encoder_funcs = {
  86                 .destroy        = drm_encoder_cleanup,
  87 };
  88
  89 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  90                 .dpms           = panel_encoder_dpms,
  91                 .prepare        = panel_encoder_prepare,
  92                 .commit         = panel_encoder_commit,
  93                 .mode_set       = panel_encoder_mode_set,
  94 };
  95
  96 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
  97                 struct panel_module *mod)
  98 {
  99         struct panel_encoder *panel_encoder;
 100         struct drm_encoder *encoder;
 101         int ret;
 102
 103         panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
 104                                      GFP_KERNEL);
 105         if (!panel_encoder)
 106                 return NULL;
 107
 108         panel_encoder->mod = mod;
 109
 110         encoder = &panel_encoder->base;
 111         encoder->possible_crtcs = 1;
 112
 113         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 114                         DRM_MODE_ENCODER_LVDS, NULL);
 115         if (ret < 0)
 116                 goto fail;
 117
 118         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 119
 120         return encoder;
 121
 122 fail:
 123         drm_encoder_cleanup(encoder);
 124         return NULL;
 125 }
 126
 127 /*
 128  * Connector:
 129  */
 130
 131 struct panel_connector {
 132         struct drm_connector base;
 133
 134         struct drm_encoder *encoder;  /* our connected encoder */
 135         struct panel_module *mod;
 136 };
 137 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 138
 139
 140 static void panel_connector_destroy(struct drm_connector *connector)
 141 {
 142         drm_connector_unregister(connector);
 143         drm_connector_cleanup(connector);
 144 }
 145
 146 static int panel_connector_get_modes(struct drm_connector *connector)
 147 {
 148         struct drm_device *dev = connector->dev;
 149         struct panel_connector *panel_connector = to_panel_connector(connector);
 150         struct display_timings *timings = panel_connector->mod->timings;
 151         int i;
 152
 153         for (i = 0; i < timings->num_timings; i++) {
 154                 struct drm_display_mode *mode = drm_mode_create(dev);
 155                 struct videomode vm;
 156
 157                 if (videomode_from_timings(timings, &vm, i))
 158                         break;
 159
 160                 drm_display_mode_from_videomode(&vm, mode);
 161
 162                 mode->type = DRM_MODE_TYPE_DRIVER;
 163
 164                 if (timings->native_mode == i)
 165                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 166
 167                 drm_mode_set_name(mode);
 168                 drm_mode_probed_add(connector, mode);
 169         }
 170
 171         return i;
 172 }
 173
 174 static int panel_connector_mode_valid(struct drm_connector *connector,
 175                   struct drm_display_mode *mode)
 176 {
 177         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 178         /* our only constraints are what the crtc can generate: */
 179         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 180 }
 181
 182 static struct drm_encoder *panel_connector_best_encoder(
 183                 struct drm_connector *connector)
 184 {
 185         struct panel_connector *panel_connector = to_panel_connector(connector);
 186         return panel_connector->encoder;
 187 }
 188
 189 static const struct drm_connector_funcs panel_connector_funcs = {
 190         .destroy            = panel_connector_destroy,
 191         .fill_modes         = drm_helper_probe_single_connector_modes,
 192         .reset              = drm_atomic_helper_connector_reset,
 193         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 194         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 195 };
 196
 197 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 198         .get_modes          = panel_connector_get_modes,
 199         .mode_valid         = panel_connector_mode_valid,
 200         .best_encoder       = panel_connector_best_encoder,
 201 };
 202
 203 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 204                 struct panel_module *mod, struct drm_encoder *encoder)
 205 {
 206         struct panel_connector *panel_connector;
 207         struct drm_connector *connector;
 208         int ret;
 209
 210         panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
 211                                        GFP_KERNEL);
 212         if (!panel_connector)
 213                 return NULL;
 214
 215         panel_connector->encoder = encoder;
 216         panel_connector->mod = mod;
 217
 218         connector = &panel_connector->base;
 219
 220         drm_connector_init(dev, connector, &panel_connector_funcs,
 221                         DRM_MODE_CONNECTOR_LVDS);
 222         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 223
 224         connector->interlace_allowed = 0;
 225         connector->doublescan_allowed = 0;
 226
 227         ret = drm_connector_attach_encoder(connector, encoder);
 228         if (ret)
 229                 goto fail;
 230
 231         return connector;
 232
 233 fail:
 234         panel_connector_destroy(connector);
 235         return NULL;
 236 }
 237
 238 /*
 239  * Module:
 240  */
 241
 242 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 243 {
 244         struct panel_module *panel_mod = to_panel_module(mod);
 245         struct tilcdc_drm_private *priv = dev->dev_private;
 246         struct drm_encoder *encoder;
 247         struct drm_connector *connector;
 248
 249         encoder = panel_encoder_create(dev, panel_mod);
 250         if (!encoder)
 251                 return -ENOMEM;
 252
 253         connector = panel_connector_create(dev, panel_mod, encoder);
 254         if (!connector)
 255                 return -ENOMEM;
 256
 257         priv->encoders[priv->num_encoders++] = encoder;
 258         priv->connectors[priv->num_connectors++] = connector;
 259
 260         tilcdc_crtc_set_panel_info(priv->crtc,
 261                                    to_panel_encoder(encoder)->mod->info);
 262
 263         return 0;
 264 }
 265
 266 static const struct tilcdc_module_ops panel_module_ops = {
 267                 .modeset_init = panel_modeset_init,
 268 };
 269
 270 /*
 271  * Device:
 272  */
 273
 274 /* maybe move this somewhere common if it is needed by other outputs? */
 275 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 276 {
 277         struct device_node *info_np;
 278         struct tilcdc_panel_info *info;
 279         int ret = 0;
 280
 281         if (!np) {
 282                 pr_err("%s: no devicenode given\n", __func__);
 283                 return NULL;
 284         }
 285
 286         info_np = of_get_child_by_name(np, "panel-info");
 287         if (!info_np) {
 288                 pr_err("%s: could not find panel-info node\n", __func__);
 289                 return NULL;
 290         }
 291
 292         info = kzalloc(sizeof(*info), GFP_KERNEL);
 293         if (!info)
 294                 goto put_node;
 295
 296         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 297         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 298         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 299         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 300         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 301         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 302         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 303         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 304         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 305
 306         /* optional: */
 307         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 308         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 309
 310         if (ret) {
 311                 pr_err("%s: error reading panel-info properties\n", __func__);
 312                 kfree(info);
 313                 info = NULL;
 314         }
 315
 316 put_node:
 317         of_node_put(info_np);
 318         return info;
 319 }
 320
 321 static int panel_probe(struct platform_device *pdev)
 322 {
 323         struct device_node *bl_node, *node = pdev->dev.of_node;
 324         struct panel_module *panel_mod;
 325         struct tilcdc_module *mod;
 326         struct pinctrl *pinctrl;
 327         int ret;
 328
 329         /* bail out early if no DT data: */
 330         if (!node) {
 331                 dev_err(&pdev->dev, "device-tree data is missing\n");
 332                 return -ENXIO;
 333         }
 334
 335         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 336         if (!panel_mod)
 337                 return -ENOMEM;
 338
 339         bl_node = of_parse_phandle(node, "backlight", 0);
 340         if (bl_node) {
 341                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
 342                 of_node_put(bl_node);
 343
 344                 if (!panel_mod->backlight)
 345                         return -EPROBE_DEFER;
 346
 347                 dev_info(&pdev->dev, "found backlight\n");
 348         }
 349
 350         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 351                                                          GPIOD_OUT_LOW);
 352         if (IS_ERR(panel_mod->enable_gpio)) {
 353                 ret = PTR_ERR(panel_mod->enable_gpio);
 354                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
 355                 goto fail_backlight;
 356         }
 357
 358         if (panel_mod->enable_gpio)
 359                 dev_info(&pdev->dev, "found enable GPIO\n");
 360
 361         mod = &panel_mod->base;
 362         pdev->dev.platform_data = mod;
 363
 364         tilcdc_module_init(mod, "panel", &panel_module_ops);
 365
 366         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 367         if (IS_ERR(pinctrl))
 368                 dev_warn(&pdev->dev, "pins are not configured\n");
 369
 370         panel_mod->timings = of_get_display_timings(node);
 371         if (!panel_mod->timings) {
 372                 dev_err(&pdev->dev, "could not get panel timings\n");
 373                 ret = -EINVAL;
 374                 goto fail_free;
 375         }
 376
 377         panel_mod->info = of_get_panel_info(node);
 378         if (!panel_mod->info) {
 379                 dev_err(&pdev->dev, "could not get panel info\n");
 380                 ret = -EINVAL;
 381                 goto fail_timings;
 382         }
 383
 384         return 0;
 385
 386 fail_timings:
 387         display_timings_release(panel_mod->timings);
 388
 389 fail_free:
 390         tilcdc_module_cleanup(mod);
 391
 392 fail_backlight:
 393         if (panel_mod->backlight)
 394                 put_device(&panel_mod->backlight->dev);
 395         return ret;
 396 }
 397
 398 static int panel_remove(struct platform_device *pdev)
 399 {
 400         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 401         struct panel_module *panel_mod = to_panel_module(mod);
 402         struct backlight_device *backlight = panel_mod->backlight;
 403
 404         if (backlight)
 405                 put_device(&backlight->dev);
 406
 407         display_timings_release(panel_mod->timings);
 408
 409         tilcdc_module_cleanup(mod);
 410         kfree(panel_mod->info);
 411
 412         return 0;
 413 }
 414
 415 static const struct of_device_id panel_of_match[] = {
 416                 { .compatible = "ti,tilcdc,panel", },
 417                 { },
 418 };
 419
 420 struct platform_driver panel_driver = {
 421         .probe = panel_probe,
 422         .remove = panel_remove,
 423         .driver = {
 424                 .owner = THIS_MODULE,
 425                 .name = "tilcdc-panel",
 426                 .of_match_table = panel_of_match,
 427         },
 428 };
 429
 430 int __init tilcdc_panel_init(void)
 431 {
 432         return platform_driver_register(&panel_driver);
 433 }
 434
 435 void __exit tilcdc_panel_fini(void)
 436 {
 437         platform_driver_unregister(&panel_driver);
 438 }