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 void panel_encoder_prepare(struct drm_encoder *encoder)
  74 {
  75         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  76         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  77         tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
  78 }
  79
  80 static void panel_encoder_commit(struct drm_encoder *encoder)
  81 {
  82         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  83 }
  84
  85 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  86                 struct drm_display_mode *mode,
  87                 struct drm_display_mode *adjusted_mode)
  88 {
  89         /* nothing needed */
  90 }
  91
  92 static const struct drm_encoder_funcs panel_encoder_funcs = {
  93                 .destroy        = panel_encoder_destroy,
  94 };
  95
  96 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  97                 .dpms           = panel_encoder_dpms,
  98                 .prepare        = panel_encoder_prepare,
  99                 .commit         = panel_encoder_commit,
 100                 .mode_set       = panel_encoder_mode_set,
 101 };
 102
 103 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
 104                 struct panel_module *mod)
 105 {
 106         struct panel_encoder *panel_encoder;
 107         struct drm_encoder *encoder;
 108         int ret;
 109
 110         panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
 111         if (!panel_encoder) {
 112                 dev_err(dev->dev, "allocation failed\n");
 113                 return NULL;
 114         }
 115
 116         panel_encoder->mod = mod;
 117
 118         encoder = &panel_encoder->base;
 119         encoder->possible_crtcs = 1;
 120
 121         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 122                         DRM_MODE_ENCODER_LVDS, NULL);
 123         if (ret < 0)
 124                 goto fail;
 125
 126         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 127
 128         return encoder;
 129
 130 fail:
 131         panel_encoder_destroy(encoder);
 132         return NULL;
 133 }
 134
 135 /*
 136  * Connector:
 137  */
 138
 139 struct panel_connector {
 140         struct drm_connector base;
 141
 142         struct drm_encoder *encoder;  /* our connected encoder */
 143         struct panel_module *mod;
 144 };
 145 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 146
 147
 148 static void panel_connector_destroy(struct drm_connector *connector)
 149 {
 150         struct panel_connector *panel_connector = to_panel_connector(connector);
 151         drm_connector_unregister(connector);
 152         drm_connector_cleanup(connector);
 153         kfree(panel_connector);
 154 }
 155
 156 static enum drm_connector_status panel_connector_detect(
 157                 struct drm_connector *connector,
 158                 bool force)
 159 {
 160         return connector_status_connected;
 161 }
 162
 163 static int panel_connector_get_modes(struct drm_connector *connector)
 164 {
 165         struct drm_device *dev = connector->dev;
 166         struct panel_connector *panel_connector = to_panel_connector(connector);
 167         struct display_timings *timings = panel_connector->mod->timings;
 168         int i;
 169
 170         for (i = 0; i < timings->num_timings; i++) {
 171                 struct drm_display_mode *mode = drm_mode_create(dev);
 172                 struct videomode vm;
 173
 174                 if (videomode_from_timings(timings, &vm, i))
 175                         break;
 176
 177                 drm_display_mode_from_videomode(&vm, mode);
 178
 179                 mode->type = DRM_MODE_TYPE_DRIVER;
 180
 181                 if (timings->native_mode == i)
 182                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 183
 184                 drm_mode_set_name(mode);
 185                 drm_mode_probed_add(connector, mode);
 186         }
 187
 188         return i;
 189 }
 190
 191 static int panel_connector_mode_valid(struct drm_connector *connector,
 192                   struct drm_display_mode *mode)
 193 {
 194         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 195         /* our only constraints are what the crtc can generate: */
 196         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 197 }
 198
 199 static struct drm_encoder *panel_connector_best_encoder(
 200                 struct drm_connector *connector)
 201 {
 202         struct panel_connector *panel_connector = to_panel_connector(connector);
 203         return panel_connector->encoder;
 204 }
 205
 206 static const struct drm_connector_funcs panel_connector_funcs = {
 207         .destroy            = panel_connector_destroy,
 208         .dpms               = drm_helper_connector_dpms,
 209         .detect             = panel_connector_detect,
 210         .fill_modes         = drm_helper_probe_single_connector_modes,
 211 };
 212
 213 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 214         .get_modes          = panel_connector_get_modes,
 215         .mode_valid         = panel_connector_mode_valid,
 216         .best_encoder       = panel_connector_best_encoder,
 217 };
 218
 219 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 220                 struct panel_module *mod, struct drm_encoder *encoder)
 221 {
 222         struct panel_connector *panel_connector;
 223         struct drm_connector *connector;
 224         int ret;
 225
 226         panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
 227         if (!panel_connector) {
 228                 dev_err(dev->dev, "allocation failed\n");
 229                 return NULL;
 230         }
 231
 232         panel_connector->encoder = encoder;
 233         panel_connector->mod = mod;
 234
 235         connector = &panel_connector->base;
 236
 237         drm_connector_init(dev, connector, &panel_connector_funcs,
 238                         DRM_MODE_CONNECTOR_LVDS);
 239         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 240
 241         connector->interlace_allowed = 0;
 242         connector->doublescan_allowed = 0;
 243
 244         ret = drm_mode_connector_attach_encoder(connector, encoder);
 245         if (ret)
 246                 goto fail;
 247
 248         drm_connector_register(connector);
 249
 250         return connector;
 251
 252 fail:
 253         panel_connector_destroy(connector);
 254         return NULL;
 255 }
 256
 257 /*
 258  * Module:
 259  */
 260
 261 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 262 {
 263         struct panel_module *panel_mod = to_panel_module(mod);
 264         struct tilcdc_drm_private *priv = dev->dev_private;
 265         struct drm_encoder *encoder;
 266         struct drm_connector *connector;
 267
 268         encoder = panel_encoder_create(dev, panel_mod);
 269         if (!encoder)
 270                 return -ENOMEM;
 271
 272         connector = panel_connector_create(dev, panel_mod, encoder);
 273         if (!connector)
 274                 return -ENOMEM;
 275
 276         priv->encoders[priv->num_encoders++] = encoder;
 277         priv->connectors[priv->num_connectors++] = connector;
 278
 279         return 0;
 280 }
 281
 282 static const struct tilcdc_module_ops panel_module_ops = {
 283                 .modeset_init = panel_modeset_init,
 284 };
 285
 286 /*
 287  * Device:
 288  */
 289
 290 /* maybe move this somewhere common if it is needed by other outputs? */
 291 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 292 {
 293         struct device_node *info_np;
 294         struct tilcdc_panel_info *info;
 295         int ret = 0;
 296
 297         if (!np) {
 298                 pr_err("%s: no devicenode given\n", __func__);
 299                 return NULL;
 300         }
 301
 302         info_np = of_get_child_by_name(np, "panel-info");
 303         if (!info_np) {
 304                 pr_err("%s: could not find panel-info node\n", __func__);
 305                 return NULL;
 306         }
 307
 308         info = kzalloc(sizeof(*info), GFP_KERNEL);
 309         if (!info) {
 310                 pr_err("%s: allocation failed\n", __func__);
 311                 of_node_put(info_np);
 312                 return NULL;
 313         }
 314
 315         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 316         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 317         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 318         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 319         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 320         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 321         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 322         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 323         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 324
 325         /* optional: */
 326         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 327         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 328
 329         if (ret) {
 330                 pr_err("%s: error reading panel-info properties\n", __func__);
 331                 kfree(info);
 332                 of_node_put(info_np);
 333                 return NULL;
 334         }
 335         of_node_put(info_np);
 336
 337         return info;
 338 }
 339
 340 static int panel_probe(struct platform_device *pdev)
 341 {
 342         struct device_node *bl_node, *node = pdev->dev.of_node;
 343         struct panel_module *panel_mod;
 344         struct tilcdc_module *mod;
 345         struct pinctrl *pinctrl;
 346         int ret;
 347
 348         /* bail out early if no DT data: */
 349         if (!node) {
 350                 dev_err(&pdev->dev, "device-tree data is missing\n");
 351                 return -ENXIO;
 352         }
 353
 354         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 355         if (!panel_mod)
 356                 return -ENOMEM;
 357
 358         bl_node = of_parse_phandle(node, "backlight", 0);
 359         if (bl_node) {
 360                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
 361                 of_node_put(bl_node);
 362
 363                 if (!panel_mod->backlight)
 364                         return -EPROBE_DEFER;
 365
 366                 dev_info(&pdev->dev, "found backlight\n");
 367         }
 368
 369         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
 370                                                          GPIOD_OUT_LOW);
 371         if (IS_ERR(panel_mod->enable_gpio)) {
 372                 ret = PTR_ERR(panel_mod->enable_gpio);
 373                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
 374                 goto fail_backlight;
 375         }
 376
 377         if (panel_mod->enable_gpio)
 378                 dev_info(&pdev->dev, "found enable GPIO\n");
 379
 380         mod = &panel_mod->base;
 381         pdev->dev.platform_data = mod;
 382
 383         tilcdc_module_init(mod, "panel", &panel_module_ops);
 384
 385         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 386         if (IS_ERR(pinctrl))
 387                 dev_warn(&pdev->dev, "pins are not configured\n");
 388
 389         panel_mod->timings = of_get_display_timings(node);
 390         if (!panel_mod->timings) {
 391                 dev_err(&pdev->dev, "could not get panel timings\n");
 392                 ret = -EINVAL;
 393                 goto fail_free;
 394         }
 395
 396         panel_mod->info = of_get_panel_info(node);
 397         if (!panel_mod->info) {
 398                 dev_err(&pdev->dev, "could not get panel info\n");
 399                 ret = -EINVAL;
 400                 goto fail_timings;
 401         }
 402
 403         mod->preferred_bpp = panel_mod->info->bpp;
 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 }