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