drivers/gpu/drm/exynos/exynos_drm_hdmi.c

   1 /*
   2  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   3  * Authors:
   4  *      Inki Dae <inki.dae@samsung.com>
   5  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13
  14 #include <drm/drmP.h>
  15
  16 #include <linux/kernel.h>
  17 #include <linux/wait.h>
  18 #include <linux/module.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/pm_runtime.h>
  21
  22 #include <drm/exynos_drm.h>
  23
  24 #include "exynos_drm_drv.h"
  25 #include "exynos_drm_hdmi.h"
  26
  27 #define to_context(dev)         platform_get_drvdata(to_platform_device(dev))
  28 #define to_subdrv(dev)          to_context(dev)
  29 #define get_ctx_from_subdrv(subdrv)     container_of(subdrv,\
  30                                         struct drm_hdmi_context, subdrv);
  31
  32 /* platform device pointer for common drm hdmi device. */
  33 static struct platform_device *exynos_drm_hdmi_pdev;
  34
  35 /* Common hdmi subdrv needs to access the hdmi and mixer though context.
  36 * These should be initialied by the repective drivers */
  37 static struct exynos_drm_hdmi_context *hdmi_ctx;
  38 static struct exynos_drm_hdmi_context *mixer_ctx;
  39
  40 /* these callback points shoud be set by specific drivers. */
  41 static struct exynos_hdmi_ops *hdmi_ops;
  42 static struct exynos_mixer_ops *mixer_ops;
  43
  44 struct drm_hdmi_context {
  45         struct exynos_drm_subdrv        subdrv;
  46         struct exynos_drm_hdmi_context  *hdmi_ctx;
  47         struct exynos_drm_hdmi_context  *mixer_ctx;
  48
  49         bool    enabled[MIXER_WIN_NR];
  50 };
  51
  52 int exynos_platform_device_hdmi_register(void)
  53 {
  54         struct platform_device *pdev;
  55
  56         if (exynos_drm_hdmi_pdev)
  57                 return -EEXIST;
  58
  59         pdev = platform_device_register_simple(
  60                         "exynos-drm-hdmi", -1, NULL, 0);
  61         if (IS_ERR(pdev))
  62                 return PTR_ERR(pdev);
  63
  64         exynos_drm_hdmi_pdev = pdev;
  65
  66         return 0;
  67 }
  68
  69 void exynos_platform_device_hdmi_unregister(void)
  70 {
  71         if (exynos_drm_hdmi_pdev) {
  72                 platform_device_unregister(exynos_drm_hdmi_pdev);
  73                 exynos_drm_hdmi_pdev = NULL;
  74         }
  75 }
  76
  77 void exynos_hdmi_drv_attach(struct exynos_drm_hdmi_context *ctx)
  78 {
  79         if (ctx)
  80                 hdmi_ctx = ctx;
  81 }
  82
  83 void exynos_mixer_drv_attach(struct exynos_drm_hdmi_context *ctx)
  84 {
  85         if (ctx)
  86                 mixer_ctx = ctx;
  87 }
  88
  89 void exynos_hdmi_ops_register(struct exynos_hdmi_ops *ops)
  90 {
  91         DRM_DEBUG_KMS("%s\n", __FILE__);
  92
  93         if (ops)
  94                 hdmi_ops = ops;
  95 }
  96
  97 void exynos_mixer_ops_register(struct exynos_mixer_ops *ops)
  98 {
  99         DRM_DEBUG_KMS("%s\n", __FILE__);
 100
 101         if (ops)
 102                 mixer_ops = ops;
 103 }
 104
 105 static bool drm_hdmi_is_connected(struct device *dev)
 106 {
 107         struct drm_hdmi_context *ctx = to_context(dev);
 108
 109         DRM_DEBUG_KMS("%s\n", __FILE__);
 110
 111         if (hdmi_ops && hdmi_ops->is_connected)
 112                 return hdmi_ops->is_connected(ctx->hdmi_ctx->ctx);
 113
 114         return false;
 115 }
 116
 117 static struct edid *drm_hdmi_get_edid(struct device *dev,
 118                         struct drm_connector *connector)
 119 {
 120         struct drm_hdmi_context *ctx = to_context(dev);
 121
 122         DRM_DEBUG_KMS("%s\n", __FILE__);
 123
 124         if (hdmi_ops && hdmi_ops->get_edid)
 125                 return hdmi_ops->get_edid(ctx->hdmi_ctx->ctx, connector);
 126
 127         return NULL;
 128 }
 129
 130 static int drm_hdmi_check_timing(struct device *dev, void *timing)
 131 {
 132         struct drm_hdmi_context *ctx = to_context(dev);
 133         int ret = 0;
 134
 135         DRM_DEBUG_KMS("%s\n", __FILE__);
 136
 137         /*
 138         * Both, mixer and hdmi should be able to handle the requested mode.
 139         * If any of the two fails, return mode as BAD.
 140         */
 141
 142         if (mixer_ops && mixer_ops->check_timing)
 143                 ret = mixer_ops->check_timing(ctx->mixer_ctx->ctx, timing);
 144
 145         if (ret)
 146                 return ret;
 147
 148         if (hdmi_ops && hdmi_ops->check_timing)
 149                 return hdmi_ops->check_timing(ctx->hdmi_ctx->ctx, timing);
 150
 151         return 0;
 152 }
 153
 154 static int drm_hdmi_power_on(struct device *dev, int mode)
 155 {
 156         struct drm_hdmi_context *ctx = to_context(dev);
 157
 158         DRM_DEBUG_KMS("%s\n", __FILE__);
 159
 160         if (hdmi_ops && hdmi_ops->power_on)
 161                 return hdmi_ops->power_on(ctx->hdmi_ctx->ctx, mode);
 162
 163         return 0;
 164 }
 165
 166 static struct exynos_drm_display_ops drm_hdmi_display_ops = {
 167         .type = EXYNOS_DISPLAY_TYPE_HDMI,
 168         .is_connected = drm_hdmi_is_connected,
 169         .get_edid = drm_hdmi_get_edid,
 170         .check_timing = drm_hdmi_check_timing,
 171         .power_on = drm_hdmi_power_on,
 172 };
 173
 174 static int drm_hdmi_enable_vblank(struct device *subdrv_dev)
 175 {
 176         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 177         struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
 178         struct exynos_drm_manager *manager = subdrv->manager;
 179
 180         DRM_DEBUG_KMS("%s\n", __FILE__);
 181
 182         if (mixer_ops && mixer_ops->enable_vblank)
 183                 return mixer_ops->enable_vblank(ctx->mixer_ctx->ctx,
 184                                                 manager->pipe);
 185
 186         return 0;
 187 }
 188
 189 static void drm_hdmi_disable_vblank(struct device *subdrv_dev)
 190 {
 191         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 192
 193         DRM_DEBUG_KMS("%s\n", __FILE__);
 194
 195         if (mixer_ops && mixer_ops->disable_vblank)
 196                 return mixer_ops->disable_vblank(ctx->mixer_ctx->ctx);
 197 }
 198
 199 static void drm_hdmi_wait_for_vblank(struct device *subdrv_dev)
 200 {
 201         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 202
 203         DRM_DEBUG_KMS("%s\n", __FILE__);
 204
 205         if (mixer_ops && mixer_ops->wait_for_vblank)
 206                 mixer_ops->wait_for_vblank(ctx->mixer_ctx->ctx);
 207 }
 208
 209 static void drm_hdmi_mode_fixup(struct device *subdrv_dev,
 210                                 struct drm_connector *connector,
 211                                 const struct drm_display_mode *mode,
 212                                 struct drm_display_mode *adjusted_mode)
 213 {
 214         struct drm_display_mode *m;
 215         int mode_ok;
 216
 217         DRM_DEBUG_KMS("%s\n", __FILE__);
 218
 219         drm_mode_set_crtcinfo(adjusted_mode, 0);
 220
 221         mode_ok = drm_hdmi_check_timing(subdrv_dev, adjusted_mode);
 222
 223         /* just return if user desired mode exists. */
 224         if (mode_ok == 0)
 225                 return;
 226
 227         /*
 228          * otherwise, find the most suitable mode among modes and change it
 229          * to adjusted_mode.
 230          */
 231         list_for_each_entry(m, &connector->modes, head) {
 232                 mode_ok = drm_hdmi_check_timing(subdrv_dev, m);
 233
 234                 if (mode_ok == 0) {
 235                         struct drm_mode_object base;
 236                         struct list_head head;
 237
 238                         DRM_INFO("desired mode doesn't exist so\n");
 239                         DRM_INFO("use the most suitable mode among modes.\n");
 240
 241                         DRM_DEBUG_KMS("Adjusted Mode: [%d]x[%d] [%d]Hz\n",
 242                                 m->hdisplay, m->vdisplay, m->vrefresh);
 243
 244                         /* preserve display mode header while copying. */
 245                         head = adjusted_mode->head;
 246                         base = adjusted_mode->base;
 247                         memcpy(adjusted_mode, m, sizeof(*m));
 248                         adjusted_mode->head = head;
 249                         adjusted_mode->base = base;
 250                         break;
 251                 }
 252         }
 253 }
 254
 255 static void drm_hdmi_mode_set(struct device *subdrv_dev, void *mode)
 256 {
 257         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 258
 259         DRM_DEBUG_KMS("%s\n", __FILE__);
 260
 261         if (hdmi_ops && hdmi_ops->mode_set)
 262                 hdmi_ops->mode_set(ctx->hdmi_ctx->ctx, mode);
 263 }
 264
 265 static void drm_hdmi_get_max_resol(struct device *subdrv_dev,
 266                                 unsigned int *width, unsigned int *height)
 267 {
 268         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 269
 270         DRM_DEBUG_KMS("%s\n", __FILE__);
 271
 272         if (hdmi_ops && hdmi_ops->get_max_resol)
 273                 hdmi_ops->get_max_resol(ctx->hdmi_ctx->ctx, width, height);
 274 }
 275
 276 static void drm_hdmi_commit(struct device *subdrv_dev)
 277 {
 278         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 279
 280         DRM_DEBUG_KMS("%s\n", __FILE__);
 281
 282         if (hdmi_ops && hdmi_ops->commit)
 283                 hdmi_ops->commit(ctx->hdmi_ctx->ctx);
 284 }
 285
 286 static void drm_hdmi_dpms(struct device *subdrv_dev, int mode)
 287 {
 288         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 289
 290         DRM_DEBUG_KMS("%s\n", __FILE__);
 291
 292         if (mixer_ops && mixer_ops->dpms)
 293                 mixer_ops->dpms(ctx->mixer_ctx->ctx, mode);
 294
 295         if (hdmi_ops && hdmi_ops->dpms)
 296                 hdmi_ops->dpms(ctx->hdmi_ctx->ctx, mode);
 297 }
 298
 299 static void drm_hdmi_apply(struct device *subdrv_dev)
 300 {
 301         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 302         int i;
 303
 304         DRM_DEBUG_KMS("%s\n", __FILE__);
 305
 306         for (i = 0; i < MIXER_WIN_NR; i++) {
 307                 if (!ctx->enabled[i])
 308                         continue;
 309                 if (mixer_ops && mixer_ops->win_commit)
 310                         mixer_ops->win_commit(ctx->mixer_ctx->ctx, i);
 311         }
 312
 313         if (hdmi_ops && hdmi_ops->commit)
 314                 hdmi_ops->commit(ctx->hdmi_ctx->ctx);
 315 }
 316
 317 static struct exynos_drm_manager_ops drm_hdmi_manager_ops = {
 318         .dpms = drm_hdmi_dpms,
 319         .apply = drm_hdmi_apply,
 320         .enable_vblank = drm_hdmi_enable_vblank,
 321         .disable_vblank = drm_hdmi_disable_vblank,
 322         .wait_for_vblank = drm_hdmi_wait_for_vblank,
 323         .mode_fixup = drm_hdmi_mode_fixup,
 324         .mode_set = drm_hdmi_mode_set,
 325         .get_max_resol = drm_hdmi_get_max_resol,
 326         .commit = drm_hdmi_commit,
 327 };
 328
 329 static void drm_mixer_mode_set(struct device *subdrv_dev,
 330                 struct exynos_drm_overlay *overlay)
 331 {
 332         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 333
 334         DRM_DEBUG_KMS("%s\n", __FILE__);
 335
 336         if (mixer_ops && mixer_ops->win_mode_set)
 337                 mixer_ops->win_mode_set(ctx->mixer_ctx->ctx, overlay);
 338 }
 339
 340 static void drm_mixer_commit(struct device *subdrv_dev, int zpos)
 341 {
 342         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 343         int win = (zpos == DEFAULT_ZPOS) ? MIXER_DEFAULT_WIN : zpos;
 344
 345         DRM_DEBUG_KMS("%s\n", __FILE__);
 346
 347         if (win < 0 || win > MIXER_WIN_NR) {
 348                 DRM_ERROR("mixer window[%d] is wrong\n", win);
 349                 return;
 350         }
 351
 352         if (mixer_ops && mixer_ops->win_commit)
 353                 mixer_ops->win_commit(ctx->mixer_ctx->ctx, win);
 354
 355         ctx->enabled[win] = true;
 356 }
 357
 358 static void drm_mixer_disable(struct device *subdrv_dev, int zpos)
 359 {
 360         struct drm_hdmi_context *ctx = to_context(subdrv_dev);
 361         int win = (zpos == DEFAULT_ZPOS) ? MIXER_DEFAULT_WIN : zpos;
 362
 363         DRM_DEBUG_KMS("%s\n", __FILE__);
 364
 365         if (win < 0 || win > MIXER_WIN_NR) {
 366                 DRM_ERROR("mixer window[%d] is wrong\n", win);
 367                 return;
 368         }
 369
 370         if (mixer_ops && mixer_ops->win_disable)
 371                 mixer_ops->win_disable(ctx->mixer_ctx->ctx, win);
 372
 373         ctx->enabled[win] = false;
 374 }
 375
 376 static struct exynos_drm_overlay_ops drm_hdmi_overlay_ops = {
 377         .mode_set = drm_mixer_mode_set,
 378         .commit = drm_mixer_commit,
 379         .disable = drm_mixer_disable,
 380 };
 381
 382 static struct exynos_drm_manager hdmi_manager = {
 383         .pipe           = -1,
 384         .ops            = &drm_hdmi_manager_ops,
 385         .overlay_ops    = &drm_hdmi_overlay_ops,
 386         .display_ops    = &drm_hdmi_display_ops,
 387 };
 388
 389 static int hdmi_subdrv_probe(struct drm_device *drm_dev,
 390                 struct device *dev)
 391 {
 392         struct exynos_drm_subdrv *subdrv = to_subdrv(dev);
 393         struct drm_hdmi_context *ctx;
 394
 395         DRM_DEBUG_KMS("%s\n", __FILE__);
 396
 397         if (!hdmi_ctx) {
 398                 DRM_ERROR("hdmi context not initialized.\n");
 399                 return -EFAULT;
 400         }
 401
 402         if (!mixer_ctx) {
 403                 DRM_ERROR("mixer context not initialized.\n");
 404                 return -EFAULT;
 405         }
 406
 407         ctx = get_ctx_from_subdrv(subdrv);
 408
 409         if (!ctx) {
 410                 DRM_ERROR("no drm hdmi context.\n");
 411                 return -EFAULT;
 412         }
 413
 414         ctx->hdmi_ctx = hdmi_ctx;
 415         ctx->mixer_ctx = mixer_ctx;
 416
 417         ctx->hdmi_ctx->drm_dev = drm_dev;
 418         ctx->mixer_ctx->drm_dev = drm_dev;
 419
 420         if (mixer_ops->iommu_on)
 421                 mixer_ops->iommu_on(ctx->mixer_ctx->ctx, true);
 422
 423         return 0;
 424 }
 425
 426 static void hdmi_subdrv_remove(struct drm_device *drm_dev, struct device *dev)
 427 {
 428         struct drm_hdmi_context *ctx;
 429         struct exynos_drm_subdrv *subdrv = to_subdrv(dev);
 430
 431         ctx = get_ctx_from_subdrv(subdrv);
 432
 433         if (mixer_ops->iommu_on)
 434                 mixer_ops->iommu_on(ctx->mixer_ctx->ctx, false);
 435 }
 436
 437 static int exynos_drm_hdmi_probe(struct platform_device *pdev)
 438 {
 439         struct device *dev = &pdev->dev;
 440         struct exynos_drm_subdrv *subdrv;
 441         struct drm_hdmi_context *ctx;
 442
 443         DRM_DEBUG_KMS("%s\n", __FILE__);
 444
 445         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 446         if (!ctx) {
 447                 DRM_LOG_KMS("failed to alloc common hdmi context.\n");
 448                 return -ENOMEM;
 449         }
 450
 451         subdrv = &ctx->subdrv;
 452
 453         subdrv->dev = dev;
 454         subdrv->manager = &hdmi_manager;
 455         subdrv->probe = hdmi_subdrv_probe;
 456         subdrv->remove = hdmi_subdrv_remove;
 457
 458         platform_set_drvdata(pdev, subdrv);
 459
 460         exynos_drm_subdrv_register(subdrv);
 461
 462         return 0;
 463 }
 464
 465 static int exynos_drm_hdmi_remove(struct platform_device *pdev)
 466 {
 467         struct drm_hdmi_context *ctx = platform_get_drvdata(pdev);
 468
 469         DRM_DEBUG_KMS("%s\n", __FILE__);
 470
 471         exynos_drm_subdrv_unregister(&ctx->subdrv);
 472
 473         return 0;
 474 }
 475
 476 struct platform_driver exynos_drm_common_hdmi_driver = {
 477         .probe          = exynos_drm_hdmi_probe,
 478         .remove         = exynos_drm_hdmi_remove,
 479         .driver         = {
 480                 .name   = "exynos-drm-hdmi",
 481                 .owner  = THIS_MODULE,
 482         },
 483 };