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