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