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 <video/display_timing.h>
  22 #include <video/of_display_timing.h>
  23 #include <video/videomode.h>
  24
  25 #include "tilcdc_drv.h"
  26
  27 struct panel_module {
  28         struct tilcdc_module base;
  29         struct tilcdc_panel_info *info;
  30         struct display_timings *timings;
  31         struct backlight_device *backlight;
  32 };
  33 #define to_panel_module(x) container_of(x, struct panel_module, base)
  34
  35
  36 /*
  37  * Encoder:
  38  */
  39
  40 struct panel_encoder {
  41         struct drm_encoder base;
  42         struct panel_module *mod;
  43 };
  44 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
  45
  46
  47 static void panel_encoder_destroy(struct drm_encoder *encoder)
  48 {
  49         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  50         drm_encoder_cleanup(encoder);
  51         kfree(panel_encoder);
  52 }
  53
  54 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
  55 {
  56         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  57         struct backlight_device *backlight = panel_encoder->mod->backlight;
  58
  59         if (!backlight)
  60                 return;
  61
  62         backlight->props.power = mode == DRM_MODE_DPMS_ON
  63                                      ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
  64         backlight_update_status(backlight);
  65 }
  66
  67 static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
  68                 const struct drm_display_mode *mode,
  69                 struct drm_display_mode *adjusted_mode)
  70 {
  71         /* nothing needed */
  72         return true;
  73 }
  74
  75 static void panel_encoder_prepare(struct drm_encoder *encoder)
  76 {
  77         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
  78         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  79         tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
  80 }
  81
  82 static void panel_encoder_commit(struct drm_encoder *encoder)
  83 {
  84         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  85 }
  86
  87 static void panel_encoder_mode_set(struct drm_encoder *encoder,
  88                 struct drm_display_mode *mode,
  89                 struct drm_display_mode *adjusted_mode)
  90 {
  91         /* nothing needed */
  92 }
  93
  94 static const struct drm_encoder_funcs panel_encoder_funcs = {
  95                 .destroy        = panel_encoder_destroy,
  96 };
  97
  98 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
  99                 .dpms           = panel_encoder_dpms,
 100                 .mode_fixup     = panel_encoder_mode_fixup,
 101                 .prepare        = panel_encoder_prepare,
 102                 .commit         = panel_encoder_commit,
 103                 .mode_set       = panel_encoder_mode_set,
 104 };
 105
 106 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
 107                 struct panel_module *mod)
 108 {
 109         struct panel_encoder *panel_encoder;
 110         struct drm_encoder *encoder;
 111         int ret;
 112
 113         panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
 114         if (!panel_encoder) {
 115                 dev_err(dev->dev, "allocation failed\n");
 116                 return NULL;
 117         }
 118
 119         panel_encoder->mod = mod;
 120
 121         encoder = &panel_encoder->base;
 122         encoder->possible_crtcs = 1;
 123
 124         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
 125                         DRM_MODE_ENCODER_LVDS);
 126         if (ret < 0)
 127                 goto fail;
 128
 129         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
 130
 131         return encoder;
 132
 133 fail:
 134         panel_encoder_destroy(encoder);
 135         return NULL;
 136 }
 137
 138 /*
 139  * Connector:
 140  */
 141
 142 struct panel_connector {
 143         struct drm_connector base;
 144
 145         struct drm_encoder *encoder;  /* our connected encoder */
 146         struct panel_module *mod;
 147 };
 148 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
 149
 150
 151 static void panel_connector_destroy(struct drm_connector *connector)
 152 {
 153         struct panel_connector *panel_connector = to_panel_connector(connector);
 154         drm_connector_unregister(connector);
 155         drm_connector_cleanup(connector);
 156         kfree(panel_connector);
 157 }
 158
 159 static enum drm_connector_status panel_connector_detect(
 160                 struct drm_connector *connector,
 161                 bool force)
 162 {
 163         return connector_status_connected;
 164 }
 165
 166 static int panel_connector_get_modes(struct drm_connector *connector)
 167 {
 168         struct drm_device *dev = connector->dev;
 169         struct panel_connector *panel_connector = to_panel_connector(connector);
 170         struct display_timings *timings = panel_connector->mod->timings;
 171         int i;
 172
 173         for (i = 0; i < timings->num_timings; i++) {
 174                 struct drm_display_mode *mode = drm_mode_create(dev);
 175                 struct videomode vm;
 176
 177                 if (videomode_from_timings(timings, &vm, i))
 178                         break;
 179
 180                 drm_display_mode_from_videomode(&vm, mode);
 181
 182                 mode->type = DRM_MODE_TYPE_DRIVER;
 183
 184                 if (timings->native_mode == i)
 185                         mode->type |= DRM_MODE_TYPE_PREFERRED;
 186
 187                 drm_mode_set_name(mode);
 188                 drm_mode_probed_add(connector, mode);
 189         }
 190
 191         return i;
 192 }
 193
 194 static int panel_connector_mode_valid(struct drm_connector *connector,
 195                   struct drm_display_mode *mode)
 196 {
 197         struct tilcdc_drm_private *priv = connector->dev->dev_private;
 198         /* our only constraints are what the crtc can generate: */
 199         return tilcdc_crtc_mode_valid(priv->crtc, mode);
 200 }
 201
 202 static struct drm_encoder *panel_connector_best_encoder(
 203                 struct drm_connector *connector)
 204 {
 205         struct panel_connector *panel_connector = to_panel_connector(connector);
 206         return panel_connector->encoder;
 207 }
 208
 209 static const struct drm_connector_funcs panel_connector_funcs = {
 210         .destroy            = panel_connector_destroy,
 211         .dpms               = drm_helper_connector_dpms,
 212         .detect             = panel_connector_detect,
 213         .fill_modes         = drm_helper_probe_single_connector_modes,
 214 };
 215
 216 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
 217         .get_modes          = panel_connector_get_modes,
 218         .mode_valid         = panel_connector_mode_valid,
 219         .best_encoder       = panel_connector_best_encoder,
 220 };
 221
 222 static struct drm_connector *panel_connector_create(struct drm_device *dev,
 223                 struct panel_module *mod, struct drm_encoder *encoder)
 224 {
 225         struct panel_connector *panel_connector;
 226         struct drm_connector *connector;
 227         int ret;
 228
 229         panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
 230         if (!panel_connector) {
 231                 dev_err(dev->dev, "allocation failed\n");
 232                 return NULL;
 233         }
 234
 235         panel_connector->encoder = encoder;
 236         panel_connector->mod = mod;
 237
 238         connector = &panel_connector->base;
 239
 240         drm_connector_init(dev, connector, &panel_connector_funcs,
 241                         DRM_MODE_CONNECTOR_LVDS);
 242         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
 243
 244         connector->interlace_allowed = 0;
 245         connector->doublescan_allowed = 0;
 246
 247         ret = drm_mode_connector_attach_encoder(connector, encoder);
 248         if (ret)
 249                 goto fail;
 250
 251         drm_connector_register(connector);
 252
 253         return connector;
 254
 255 fail:
 256         panel_connector_destroy(connector);
 257         return NULL;
 258 }
 259
 260 /*
 261  * Module:
 262  */
 263
 264 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
 265 {
 266         struct panel_module *panel_mod = to_panel_module(mod);
 267         struct tilcdc_drm_private *priv = dev->dev_private;
 268         struct drm_encoder *encoder;
 269         struct drm_connector *connector;
 270
 271         encoder = panel_encoder_create(dev, panel_mod);
 272         if (!encoder)
 273                 return -ENOMEM;
 274
 275         connector = panel_connector_create(dev, panel_mod, encoder);
 276         if (!connector)
 277                 return -ENOMEM;
 278
 279         priv->encoders[priv->num_encoders++] = encoder;
 280         priv->connectors[priv->num_connectors++] = connector;
 281
 282         return 0;
 283 }
 284
 285 static const struct tilcdc_module_ops panel_module_ops = {
 286                 .modeset_init = panel_modeset_init,
 287 };
 288
 289 /*
 290  * Device:
 291  */
 292
 293 /* maybe move this somewhere common if it is needed by other outputs? */
 294 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
 295 {
 296         struct device_node *info_np;
 297         struct tilcdc_panel_info *info;
 298         int ret = 0;
 299
 300         if (!np) {
 301                 pr_err("%s: no devicenode given\n", __func__);
 302                 return NULL;
 303         }
 304
 305         info_np = of_get_child_by_name(np, "panel-info");
 306         if (!info_np) {
 307                 pr_err("%s: could not find panel-info node\n", __func__);
 308                 return NULL;
 309         }
 310
 311         info = kzalloc(sizeof(*info), GFP_KERNEL);
 312         if (!info) {
 313                 pr_err("%s: allocation failed\n", __func__);
 314                 return NULL;
 315         }
 316
 317         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
 318         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
 319         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
 320         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
 321         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
 322         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
 323         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
 324         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
 325         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
 326
 327         /* optional: */
 328         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
 329         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
 330
 331         if (ret) {
 332                 pr_err("%s: error reading panel-info properties\n", __func__);
 333                 kfree(info);
 334                 return NULL;
 335         }
 336
 337         return info;
 338 }
 339
 340 static struct of_device_id panel_of_match[];
 341
 342 static int panel_probe(struct platform_device *pdev)
 343 {
 344         struct device_node *node = pdev->dev.of_node;
 345         struct panel_module *panel_mod;
 346         struct tilcdc_module *mod;
 347         struct pinctrl *pinctrl;
 348         int ret = -EINVAL;
 349
 350
 351         /* bail out early if no DT data: */
 352         if (!node) {
 353                 dev_err(&pdev->dev, "device-tree data is missing\n");
 354                 return -ENXIO;
 355         }
 356
 357         panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL);
 358         if (!panel_mod)
 359                 return -ENOMEM;
 360
 361         mod = &panel_mod->base;
 362         pdev->dev.platform_data = mod;
 363
 364         tilcdc_module_init(mod, "panel", &panel_module_ops);
 365
 366         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
 367         if (IS_ERR(pinctrl))
 368                 dev_warn(&pdev->dev, "pins are not configured\n");
 369
 370         panel_mod->timings = of_get_display_timings(node);
 371         if (!panel_mod->timings) {
 372                 dev_err(&pdev->dev, "could not get panel timings\n");
 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                 goto fail_timings;
 380         }
 381
 382         mod->preferred_bpp = panel_mod->info->bpp;
 383
 384         panel_mod->backlight = of_find_backlight_by_node(node);
 385         if (panel_mod->backlight)
 386                 dev_info(&pdev->dev, "found backlight\n");
 387
 388         return 0;
 389
 390 fail_timings:
 391         display_timings_release(panel_mod->timings);
 392
 393 fail_free:
 394         kfree(panel_mod);
 395         tilcdc_module_cleanup(mod);
 396         return ret;
 397 }
 398
 399 static int panel_remove(struct platform_device *pdev)
 400 {
 401         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
 402         struct panel_module *panel_mod = to_panel_module(mod);
 403
 404         display_timings_release(panel_mod->timings);
 405
 406         tilcdc_module_cleanup(mod);
 407         kfree(panel_mod->info);
 408         kfree(panel_mod);
 409
 410         return 0;
 411 }
 412
 413 static struct of_device_id panel_of_match[] = {
 414                 { .compatible = "ti,tilcdc,panel", },
 415                 { },
 416 };
 417
 418 struct platform_driver panel_driver = {
 419         .probe = panel_probe,
 420         .remove = panel_remove,
 421         .driver = {
 422                 .owner = THIS_MODULE,
 423                 .name = "panel",
 424                 .of_match_table = panel_of_match,
 425         },
 426 };
 427
 428 int __init tilcdc_panel_init(void)
 429 {
 430         return platform_driver_register(&panel_driver);
 431 }
 432
 433 void __exit tilcdc_panel_fini(void)
 434 {
 435         platform_driver_unregister(&panel_driver);
 436 }