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