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