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