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
  26 #include "tilcdc_drv.h"
  27
  28 struct panel_module {
  29         struct tilcdc_module base;
  30         struct tilcdc_panel_info *info;
  31         struct display_timings *timings;
  32         struct backlight_device *backlight;
  33         struct gpio_desc *enable_gpio;
  34 };
  35 #define to_panel_module(x) container_of(x, struct panel_module, base)
  36
  37
  38 /*
  39  * Encoder:
  40  */
  41
  42 struct panel_encoder {
  43         struct drm_encoder base;
  44         struct panel_module *mod;
  45 };
  46 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  47
  48
  49 static void panel_encoder_destroy(struct drm_encoder *encoder)
  50 {
  51         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  52         drm_encoder_cleanup(encoder);
  53         kfree(panel_encoder);
  54 }
  55
  56 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  57 {
  58         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  59         struct backlight_device *backlight = panel_encoder->mod->backlight;
  60         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  61
  62         if (backlight) {
  63                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  64                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  65                 backlight_update_status(backlight);
  66         }
  67
  68         if (gpio)
  69                 gpiod_set_value_cansleep(gpio,
  70                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
  71 }
  72
  73 static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
  74                 const struct drm_display_mode *mode,
  75                 struct drm_display_mode *adjusted_mode)
  76 {
  77         /* nothing needed */
  78         return true;
  79 }
  80
  81 static void panel_encoder_prepare(struct drm_encoder *encoder)
  82 {
  83         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  84         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  85         tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
  86 }
  87
  88 static void panel_encoder_commit(struct drm_encoder *encoder)
  89 {
  90         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  91 }
  92
  93 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  94                 struct drm_display_mode *mode,
  95                 struct drm_display_mode *adjusted_mode)
  96 {
  97         /* nothing needed */
  98 }
  99
 100 static const struct drm_encoder_funcs panel_encoder_funcs = {
 101                 .destroy        = panel_encoder_destroy,
 102 };
 103
 104 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
 105                 .dpms           = panel_encoder_dpms,
 106                 .mode_fixup     = panel_encoder_mode_fixup,
 107                 .prepare        = panel_encoder_prepare,
 108                 .commit         = panel_encoder_commit,
 109                 .mode_set       = panel_encoder_mode_set,
 110 };
 111
 112 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
 113                 struct panel_module *mod)
 114 {
 115         struct panel_encoder *panel_encoder;
 116         struct drm_encoder *encoder;
 117         int ret;
 118
 119         panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
 120         if (!panel_encoder) {
 121                 dev_err(dev->dev, "allocation failed\n");
 122                 return NULL;
 123         }
 124
 125         panel_encoder->mod = mod;
 126
 127         encoder = &panel_encoder->base;
 128         encoder->possible_crtcs = 1;
 129
 130         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 131                         DRM_MODE_ENCODER_LVDS);
 132         if (ret < 0)
 133                 goto fail;
 134
 135         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 136
 137         return encoder;
 138
 139 fail:
 140         panel_encoder_destroy(encoder);
 141         return NULL;
 142 }
 143
 144 /*
 145  * Connector:
 146  */
 147
 148 struct panel_connector {
 149         struct drm_connector base;
 150
 151         struct drm_encoder *encoder;  /* our connected encoder */
 152         struct panel_module *mod;
 153 };
 154 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 155
 156
 157 static void panel_connector_destroy(struct drm_connector *connector)
 158 {
 159         struct panel_connector *panel_connector = to_panel_connector(connector);
 160         drm_connector_unregister(connector);
 161         drm_connector_cleanup(connector);
 162         kfree(panel_connector);
 163 }
 164
 165 static enum drm_connector_status panel_connector_detect(
 166                 struct drm_connector *connector,
 167                 bool force)
 168 {
 169         return connector_status_connected;
 170 }
 171
 172 static int panel_connector_get_modes(struct drm_connector *connector)
 173 {
 174         struct drm_device *dev = connector->dev;
 175         struct panel_connector *panel_connector = to_panel_connector(connector);
 176         struct display_timings *timings = panel_connector->mod->timings;
 177         int i;
 178
 179         for (i = 0; i < timings->num_timings; i++) {
 180                 struct drm_display_mode *mode;
 181                 struct videomode vm;
 182
 183                 if (videomode_from_timings(timings, &vm, i))
 184                         break;
 185
 186                 mode = drm_mode_create(dev);
 187                 if (!mode)
 188                         break;
 189
 190                 drm_display_mode_from_videomode(&vm, mode);
 191
 192                 mode->type = DRM_MODE_TYPE_DRIVER;
 193
 194                 if (timings->native_mode == i)
 195                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 196
 197                 drm_mode_set_name(mode);
 198                 drm_mode_probed_add(connector, mode);
 199         }
 200
 201         return i;
 202 }
 203
 204 static int panel_connector_mode_valid(struct drm_connector *connector,
 205                   struct drm_display_mode *mode)
 206 {
 207         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 208         /* our only constraints are what the crtc can generate: */
 209         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 210 }
 211
 212 static struct drm_encoder *panel_connector_best_encoder(
 213                 struct drm_connector *connector)
 214 {
 215         struct panel_connector *panel_connector = to_panel_connector(connector);
 216         return panel_connector->encoder;
 217 }
 218
 219 static const struct drm_connector_funcs panel_connector_funcs = {
 220         .destroy            = panel_connector_destroy,
 221         .dpms               = drm_helper_connector_dpms,
 222         .detect             = panel_connector_detect,
 223         .fill_modes         = drm_helper_probe_single_connector_modes,
 224 };
 225
 226 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 227         .get_modes          = panel_connector_get_modes,
 228         .mode_valid         = panel_connector_mode_valid,
 229         .best_encoder       = panel_connector_best_encoder,
 230 };
 231
 232 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 233                 struct panel_module *mod, struct drm_encoder *encoder)
 234 {
 235         struct panel_connector *panel_connector;
 236         struct drm_connector *connector;
 237         int ret;
 238
 239         panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
 240         if (!panel_connector) {
 241                 dev_err(dev->dev, "allocation failed\n");
 242                 return NULL;
 243         }
 244
 245         panel_connector->encoder = encoder;
 246         panel_connector->mod = mod;
 247
 248         connector = &panel_connector->base;
 249
 250         drm_connector_init(dev, connector, &panel_connector_funcs,
 251                         DRM_MODE_CONNECTOR_LVDS);
 252         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 253
 254         connector->interlace_allowed = 0;
 255         connector->doublescan_allowed = 0;
 256
 257         ret = drm_mode_connector_attach_encoder(connector, encoder);
 258         if (ret)
 259                 goto fail;
 260
 261         drm_connector_register(connector);
 262
 263         return connector;
 264
 265 fail:
 266         panel_connector_destroy(connector);
 267         return NULL;
 268 }
 269
 270 /*
 271  * Module:
 272  */
 273
 274 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 275 {
 276         struct panel_module *panel_mod = to_panel_module(mod);
 277         struct tilcdc_drm_private *priv = dev->dev_private;
 278         struct drm_encoder *encoder;
 279         struct drm_connector *connector;
 280
 281         encoder = panel_encoder_create(dev, panel_mod);
 282         if (!encoder)
 283                 return -ENOMEM;
 284
 285         connector = panel_connector_create(dev, panel_mod, encoder);
 286         if (!connector)
 287                 return -ENOMEM;
 288
 289         priv->encoders[priv->num_encoders++] = encoder;
 290         priv->connectors[priv->num_connectors++] = connector;
 291
 292         return 0;
 293 }
 294
 295 static const struct tilcdc_module_ops panel_module_ops = {
 296                 .modeset_init = panel_modeset_init,
 297 };
 298
 299 /*
 300  * Device:
 301  */
 302
 303 /* maybe move this somewhere common if it is needed by other outputs? */
 304 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 305 {
 306         struct device_node *info_np;
 307         struct tilcdc_panel_info *info;
 308         int ret = 0;
 309
 310         if (!np) {
 311                 pr_err("%s: no devicenode given\n", __func__);
 312                 return NULL;
 313         }
 314
 315         info_np = of_get_child_by_name(np, "panel-info");
 316         if (!info_np) {
 317                 pr_err("%s: could not find panel-info node\n", __func__);
 318                 return NULL;
 319         }
 320
 321         info = kzalloc(sizeof(*info), GFP_KERNEL);
 322         if (!info) {
 323                 pr_err("%s: allocation failed\n", __func__);
 324                 of_node_put(info_np);
 325                 return NULL;
 326         }
 327
 328         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 329         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 330         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 331         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 332         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 333         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 334         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 335         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 336         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 337
 338         /* optional: */
 339         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 340         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 341
 342         if (ret) {
 343                 pr_err("%s: error reading panel-info properties\n", __func__);
 344                 kfree(info);
 345                 of_node_put(info_np);
 346                 return NULL;
 347         }
 348         of_node_put(info_np);
 349
 350         return info;
 351 }
 352
 353 static int panel_probe(struct platform_device *pdev)
 354 {
 355         struct device_node *bl_node, *node = pdev->dev.of_node;
 356         struct panel_module *panel_mod;
 357         struct tilcdc_module *mod;
 358         struct pinctrl *pinctrl;
 359         int ret;
 360
 361         /* bail out early if no DT data: */
 362         if (!node) {
 363                 dev_err(&pdev->dev, "device-tree data is missing\n");
 364                 return -ENXIO;
 365         }
 366
 367         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 368         if (!panel_mod)
 369                 return -ENOMEM;
 370
 371         bl_node = of_parse_phandle(node, "backlight", 0);
 372         if (bl_node) {
 373                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
 374                 of_node_put(bl_node);
 375
 376                 if (!panel_mod->backlight)
 377                         return -EPROBE_DEFER;
 378
 379                 dev_info(&pdev->dev, "found backlight\n");
 380         }
 381
 382         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 383                                                          GPIOD_OUT_LOW);
 384         if (IS_ERR(panel_mod->enable_gpio)) {
 385                 ret = PTR_ERR(panel_mod->enable_gpio);
 386                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
 387                 goto fail_backlight;
 388         }
 389
 390         if (panel_mod->enable_gpio)
 391                 dev_info(&pdev->dev, "found enable GPIO\n");
 392
 393         mod = &panel_mod->base;
 394         pdev->dev.platform_data = mod;
 395
 396         tilcdc_module_init(mod, "panel", &panel_module_ops);
 397
 398         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 399         if (IS_ERR(pinctrl))
 400                 dev_warn(&pdev->dev, "pins are not configured\n");
 401
 402         panel_mod->timings = of_get_display_timings(node);
 403         if (!panel_mod->timings) {
 404                 dev_err(&pdev->dev, "could not get panel timings\n");
 405                 ret = -EINVAL;
 406                 goto fail_free;
 407         }
 408
 409         panel_mod->info = of_get_panel_info(node);
 410         if (!panel_mod->info) {
 411                 dev_err(&pdev->dev, "could not get panel info\n");
 412                 ret = -EINVAL;
 413                 goto fail_timings;
 414         }
 415
 416         mod->preferred_bpp = panel_mod->info->bpp;
 417
 418         return 0;
 419
 420 fail_timings:
 421         display_timings_release(panel_mod->timings);
 422
 423 fail_free:
 424         tilcdc_module_cleanup(mod);
 425
 426 fail_backlight:
 427         if (panel_mod->backlight)
 428                 put_device(&panel_mod->backlight->dev);
 429         return ret;
 430 }
 431
 432 static int panel_remove(struct platform_device *pdev)
 433 {
 434         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 435         struct panel_module *panel_mod = to_panel_module(mod);
 436         struct backlight_device *backlight = panel_mod->backlight;
 437
 438         if (backlight)
 439                 put_device(&backlight->dev);
 440
 441         display_timings_release(panel_mod->timings);
 442
 443         tilcdc_module_cleanup(mod);
 444         kfree(panel_mod->info);
 445
 446         return 0;
 447 }
 448
 449 static struct of_device_id panel_of_match[] = {
 450                 { .compatible = "ti,tilcdc,panel", },
 451                 { },
 452 };
 453
 454 struct platform_driver panel_driver = {
 455         .probe = panel_probe,
 456         .remove = panel_remove,
 457         .driver = {
 458                 .owner = THIS_MODULE,
 459                 .name = "panel",
 460                 .of_match_table = panel_of_match,
 461         },
 462 };
 463
 464 int __init tilcdc_panel_init(void)
 465 {
 466         return platform_driver_register(&panel_driver);
 467 }
 468
 469 void __exit tilcdc_panel_fini(void)
 470 {
 471         platform_driver_unregister(&panel_driver);
 472 }