kernel/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
  26 #include "tilcdc_drv.h"
  27
  28 struct panel_module {
  29         struct tilcdc_module base;
  30         struct tilcdc_panel_info *info;
  31         struct display_timings *timings;
  32         struct backlight_device *backlight;
  33         struct gpio_desc *enable_gpio;
  34 };
  35 #define to_panel_module(x) container_of(x, struct panel_module, base)
  36
  37
  38 /*
  39  * Encoder:
  40  */
  41
  42 struct panel_encoder {
  43         struct drm_encoder base;
  44         struct panel_module *mod;
  45 };
  46 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  47
  48
  49 static void panel_encoder_destroy(struct drm_encoder *encoder)
  50 {
  51         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  52         drm_encoder_cleanup(encoder);
  53         kfree(panel_encoder);
  54 }
  55
  56 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  57 {
  58         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  59         struct backlight_device *backlight = panel_encoder->mod->backlight;
  60         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
  61
  62         if (backlight) {
  63                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
  64                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  65                 backlight_update_status(backlight);
  66         }
  67
  68         if (gpio)
  69                 gpiod_set_value_cansleep(gpio,
  70                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
  71 }
  72
  73 static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
  74                 const struct drm_display_mode *mode,
  75                 struct drm_display_mode *adjusted_mode)
  76 {
  77         /* nothing needed */
  78         return true;
  79 }
  80
  81 static void panel_encoder_prepare(struct drm_encoder *encoder)
  82 {
  83         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  84         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  85         tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
  86 }
  87
  88 static void panel_encoder_commit(struct drm_encoder *encoder)
  89 {
  90         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  91 }
  92
  93 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  94                 struct drm_display_mode *mode,
  95                 struct drm_display_mode *adjusted_mode)
  96 {
  97         /* nothing needed */
  98 }
  99
 100 static const struct drm_encoder_funcs panel_encoder_funcs = {
 101                 .destroy        = panel_encoder_destroy,
 102 };
 103
 104 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
 105                 .dpms           = panel_encoder_dpms,
 106                 .mode_fixup     = panel_encoder_mode_fixup,
 107                 .prepare        = panel_encoder_prepare,
 108                 .commit         = panel_encoder_commit,
 109                 .mode_set       = panel_encoder_mode_set,
 110 };
 111
 112 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
 113                 struct panel_module *mod)
 114 {
 115         struct panel_encoder *panel_encoder;
 116         struct drm_encoder *encoder;
 117         int ret;
 118
 119         panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
 120         if (!panel_encoder) {
 121                 dev_err(dev->dev, "allocation failed\n");
 122                 return NULL;
 123         }
 124
 125         panel_encoder->mod = mod;
 126
 127         encoder = &panel_encoder->base;
 128         encoder->possible_crtcs = 1;
 129
 130         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 131                         DRM_MODE_ENCODER_LVDS);
 132         if (ret < 0)
 133                 goto fail;
 134
 135         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 136
 137         return encoder;
 138
 139 fail:
 140         panel_encoder_destroy(encoder);
 141         return NULL;
 142 }
 143
 144 /*
 145  * Connector:
 146  */
 147
 148 struct panel_connector {
 149         struct drm_connector base;
 150
 151         struct drm_encoder *encoder;  /* our connected encoder */
 152         struct panel_module *mod;
 153 };
 154 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 155
 156
 157 static void panel_connector_destroy(struct drm_connector *connector)
 158 {
 159         struct panel_connector *panel_connector = to_panel_connector(connector);
 160         drm_connector_unregister(connector);
 161         drm_connector_cleanup(connector);
 162         kfree(panel_connector);
 163 }
 164
 165 static enum drm_connector_status panel_connector_detect(
 166                 struct drm_connector *connector,
 167                 bool force)
 168 {
 169         return connector_status_connected;
 170 }
 171
 172 static int panel_connector_get_modes(struct drm_connector *connector)
 173 {
 174         struct drm_device *dev = connector->dev;
 175         struct panel_connector *panel_connector = to_panel_connector(connector);
 176         struct display_timings *timings = panel_connector->mod->timings;
 177         int i;
 178
 179         for (i = 0; i < timings->num_timings; i++) {
 180                 struct drm_display_mode *mode = drm_mode_create(dev);
 181                 struct videomode vm;
 182
 183                 if (videomode_from_timings(timings, &vm, i))
 184                         break;
 185
 186                 drm_display_mode_from_videomode(&vm, mode);
 187
 188                 mode->type = DRM_MODE_TYPE_DRIVER;
 189
 190                 if (timings->native_mode == i)
 191                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 192
 193                 drm_mode_set_name(mode);
 194                 drm_mode_probed_add(connector, mode);
 195         }
 196
 197         return i;
 198 }
 199
 200 static int panel_connector_mode_valid(struct drm_connector *connector,
 201                   struct drm_display_mode *mode)
 202 {
 203         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 204         /* our only constraints are what the crtc can generate: */
 205         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 206 }
 207
 208 static struct drm_encoder *panel_connector_best_encoder(
 209                 struct drm_connector *connector)
 210 {
 211         struct panel_connector *panel_connector = to_panel_connector(connector);
 212         return panel_connector->encoder;
 213 }
 214
 215 static const struct drm_connector_funcs panel_connector_funcs = {
 216         .destroy            = panel_connector_destroy,
 217         .dpms               = drm_helper_connector_dpms,
 218         .detect             = panel_connector_detect,
 219         .fill_modes         = drm_helper_probe_single_connector_modes,
 220 };
 221
 222 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 223         .get_modes          = panel_connector_get_modes,
 224         .mode_valid         = panel_connector_mode_valid,
 225         .best_encoder       = panel_connector_best_encoder,
 226 };
 227
 228 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 229                 struct panel_module *mod, struct drm_encoder *encoder)
 230 {
 231         struct panel_connector *panel_connector;
 232         struct drm_connector *connector;
 233         int ret;
 234
 235         panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
 236         if (!panel_connector) {
 237                 dev_err(dev->dev, "allocation failed\n");
 238                 return NULL;
 239         }
 240
 241         panel_connector->encoder = encoder;
 242         panel_connector->mod = mod;
 243
 244         connector = &panel_connector->base;
 245
 246         drm_connector_init(dev, connector, &panel_connector_funcs,
 247                         DRM_MODE_CONNECTOR_LVDS);
 248         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 249
 250         connector->interlace_allowed = 0;
 251         connector->doublescan_allowed = 0;
 252
 253         ret = drm_mode_connector_attach_encoder(connector, encoder);
 254         if (ret)
 255                 goto fail;
 256
 257         drm_connector_register(connector);
 258
 259         return connector;
 260
 261 fail:
 262         panel_connector_destroy(connector);
 263         return NULL;
 264 }
 265
 266 /*
 267  * Module:
 268  */
 269
 270 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 271 {
 272         struct panel_module *panel_mod = to_panel_module(mod);
 273         struct tilcdc_drm_private *priv = dev->dev_private;
 274         struct drm_encoder *encoder;
 275         struct drm_connector *connector;
 276
 277         encoder = panel_encoder_create(dev, panel_mod);
 278         if (!encoder)
 279                 return -ENOMEM;
 280
 281         connector = panel_connector_create(dev, panel_mod, encoder);
 282         if (!connector)
 283                 return -ENOMEM;
 284
 285         priv->encoders[priv->num_encoders++] = encoder;
 286         priv->connectors[priv->num_connectors++] = connector;
 287
 288         return 0;
 289 }
 290
 291 static const struct tilcdc_module_ops panel_module_ops = {
 292                 .modeset_init = panel_modeset_init,
 293 };
 294
 295 /*
 296  * Device:
 297  */
 298
 299 /* maybe move this somewhere common if it is needed by other outputs? */
 300 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 301 {
 302         struct device_node *info_np;
 303         struct tilcdc_panel_info *info;
 304         int ret = 0;
 305
 306         if (!np) {
 307                 pr_err("%s: no devicenode given\n", __func__);
 308                 return NULL;
 309         }
 310
 311         info_np = of_get_child_by_name(np, "panel-info");
 312         if (!info_np) {
 313                 pr_err("%s: could not find panel-info node\n", __func__);
 314                 return NULL;
 315         }
 316
 317         info = kzalloc(sizeof(*info), GFP_KERNEL);
 318         if (!info) {
 319                 pr_err("%s: allocation failed\n", __func__);
 320                 of_node_put(info_np);
 321                 return NULL;
 322         }
 323
 324         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 325         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 326         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 327         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 328         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 329         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 330         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 331         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 332         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 333
 334         /* optional: */
 335         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 336         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 337
 338         if (ret) {
 339                 pr_err("%s: error reading panel-info properties\n", __func__);
 340                 kfree(info);
 341                 of_node_put(info_np);
 342                 return NULL;
 343         }
 344         of_node_put(info_np);
 345
 346         return info;
 347 }
 348
 349 static int panel_probe(struct platform_device *pdev)
 350 {
 351         struct device_node *bl_node, *node = pdev->dev.of_node;
 352         struct panel_module *panel_mod;
 353         struct tilcdc_module *mod;
 354         struct pinctrl *pinctrl;
 355         int ret;
 356
 357         /* bail out early if no DT data: */
 358         if (!node) {
 359                 dev_err(&pdev->dev, "device-tree data is missing\n");
 360                 return -ENXIO;
 361         }
 362
 363         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
 364         if (!panel_mod)
 365                 return -ENOMEM;
 366
 367         bl_node = of_parse_phandle(node, "backlight", 0);
 368         if (bl_node) {
 369                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
 370                 of_node_put(bl_node);
 371
 372                 if (!panel_mod->backlight)
 373                         return -EPROBE_DEFER;
 374
 375                 dev_info(&pdev->dev, "found backlight\n");
 376         }
 377
 378         panel_mod->enable_gpio = devm_gpiod_get(&pdev->dev, "enable");
 379         if (IS_ERR(panel_mod->enable_gpio)) {
 380                 ret = PTR_ERR(panel_mod->enable_gpio);
 381                 if (ret != -ENOENT) {
 382                         dev_err(&pdev->dev, "failed to request enable GPIO\n");
 383                         goto fail_backlight;
 384                 }
 385
 386                 /* Optional GPIO is not here, continue silently. */
 387                 panel_mod->enable_gpio = NULL;
 388         } else {
 389                 ret = gpiod_direction_output(panel_mod->enable_gpio, 0);
 390                 if (ret < 0) {
 391                         dev_err(&pdev->dev, "failed to setup GPIO\n");
 392                         goto fail_backlight;
 393                 }
 394                 dev_info(&pdev->dev, "found enable GPIO\n");
 395         }
 396
 397         mod = &panel_mod->base;
 398         pdev->dev.platform_data = mod;
 399
 400         tilcdc_module_init(mod, "panel", &panel_module_ops);
 401
 402         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 403         if (IS_ERR(pinctrl))
 404                 dev_warn(&pdev->dev, "pins are not configured\n");
 405
 406         panel_mod->timings = of_get_display_timings(node);
 407         if (!panel_mod->timings) {
 408                 dev_err(&pdev->dev, "could not get panel timings\n");
 409                 ret = -EINVAL;
 410                 goto fail_free;
 411         }
 412
 413         panel_mod->info = of_get_panel_info(node);
 414         if (!panel_mod->info) {
 415                 dev_err(&pdev->dev, "could not get panel info\n");
 416                 ret = -EINVAL;
 417                 goto fail_timings;
 418         }
 419
 420         mod->preferred_bpp = panel_mod->info->bpp;
 421
 422         return 0;
 423
 424 fail_timings:
 425         display_timings_release(panel_mod->timings);
 426
 427 fail_free:
 428         tilcdc_module_cleanup(mod);
 429
 430 fail_backlight:
 431         if (panel_mod->backlight)
 432                 put_device(&panel_mod->backlight->dev);
 433         return ret;
 434 }
 435
 436 static int panel_remove(struct platform_device *pdev)
 437 {
 438         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 439         struct panel_module *panel_mod = to_panel_module(mod);
 440         struct backlight_device *backlight = panel_mod->backlight;
 441
 442         if (backlight)
 443                 put_device(&backlight->dev);
 444
 445         display_timings_release(panel_mod->timings);
 446
 447         tilcdc_module_cleanup(mod);
 448         kfree(panel_mod->info);
 449
 450         return 0;
 451 }
 452
 453 static struct of_device_id panel_of_match[] = {
 454                 { .compatible = "ti,tilcdc,panel", },
 455                 { },
 456 };
 457
 458 struct platform_driver panel_driver = {
 459         .probe = panel_probe,
 460         .remove = panel_remove,
 461         .driver = {
 462                 .owner = THIS_MODULE,
 463                 .name = "panel",
 464                 .of_match_table = panel_of_match,
 465         },
 466 };
 467
 468 int __init tilcdc_panel_init(void)
 469 {
 470         return platform_driver_register(&panel_driver);
 471 }
 472
 473 void __exit tilcdc_panel_fini(void)
 474 {
 475         platform_driver_unregister(&panel_driver);
 476 }