drivers/gpu/drm/imx/imx-drm-core.c

   1 /*
   2  * Freescale i.MX drm driver
   3  *
   4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16 #include <linux/component.h>
  17 #include <linux/device.h>
  18 #include <linux/dma-buf.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <drm/drmP.h>
  22 #include <drm/drm_atomic.h>
  23 #include <drm/drm_atomic_helper.h>
  24 #include <drm/drm_fb_helper.h>
  25 #include <drm/drm_crtc_helper.h>
  26 #include <drm/drm_gem_cma_helper.h>
  27 #include <drm/drm_gem_framebuffer_helper.h>
  28 #include <drm/drm_fb_cma_helper.h>
  29 #include <drm/drm_plane_helper.h>
  30 #include <drm/drm_of.h>
  31 #include <video/imx-ipu-v3.h>
  32
  33 #include "imx-drm.h"
  34 #include "ipuv3-plane.h"
  35
  36 #define MAX_CRTC        4
  37
  38 struct imx_drm_device {
  39         struct drm_device                       *drm;
  40         unsigned int                            pipes;
  41         struct drm_fbdev_cma                    *fbhelper;
  42         struct drm_atomic_state                 *state;
  43 };
  44
  45 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
  46 static int legacyfb_depth = 16;
  47 module_param(legacyfb_depth, int, 0444);
  48 #endif
  49
  50 static void imx_drm_driver_lastclose(struct drm_device *drm)
  51 {
  52         struct imx_drm_device *imxdrm = drm->dev_private;
  53
  54         drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
  55 }
  56
  57 DEFINE_DRM_GEM_CMA_FOPS(imx_drm_driver_fops);
  58
  59 void imx_drm_connector_destroy(struct drm_connector *connector)
  60 {
  61         drm_connector_unregister(connector);
  62         drm_connector_cleanup(connector);
  63 }
  64 EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
  65
  66 void imx_drm_encoder_destroy(struct drm_encoder *encoder)
  67 {
  68         drm_encoder_cleanup(encoder);
  69 }
  70 EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
  71
  72 static void imx_drm_output_poll_changed(struct drm_device *drm)
  73 {
  74         struct imx_drm_device *imxdrm = drm->dev_private;
  75
  76         drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
  77 }
  78
  79 static int imx_drm_atomic_check(struct drm_device *dev,
  80                                 struct drm_atomic_state *state)
  81 {
  82         int ret;
  83
  84         ret = drm_atomic_helper_check_modeset(dev, state);
  85         if (ret)
  86                 return ret;
  87
  88         ret = drm_atomic_helper_check_planes(dev, state);
  89         if (ret)
  90                 return ret;
  91
  92         /*
  93          * Check modeset again in case crtc_state->mode_changed is
  94          * updated in plane's ->atomic_check callback.
  95          */
  96         ret = drm_atomic_helper_check_modeset(dev, state);
  97         if (ret)
  98                 return ret;
  99
 100         /* Assign PRG/PRE channels and check if all constrains are satisfied. */
 101         ret = ipu_planes_assign_pre(dev, state);
 102         if (ret)
 103                 return ret;
 104
 105         return ret;
 106 }
 107
 108 static const struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
 109         .fb_create = drm_gem_fb_create,
 110         .output_poll_changed = imx_drm_output_poll_changed,
 111         .atomic_check = imx_drm_atomic_check,
 112         .atomic_commit = drm_atomic_helper_commit,
 113 };
 114
 115 static void imx_drm_atomic_commit_tail(struct drm_atomic_state *state)
 116 {
 117         struct drm_device *dev = state->dev;
 118         struct drm_plane *plane;
 119         struct drm_plane_state *old_plane_state, *new_plane_state;
 120         bool plane_disabling = false;
 121         int i;
 122
 123         drm_atomic_helper_commit_modeset_disables(dev, state);
 124
 125         drm_atomic_helper_commit_planes(dev, state,
 126                                 DRM_PLANE_COMMIT_ACTIVE_ONLY |
 127                                 DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET);
 128
 129         drm_atomic_helper_commit_modeset_enables(dev, state);
 130
 131         for_each_oldnew_plane_in_state(state, plane, old_plane_state, new_plane_state, i) {
 132                 if (drm_atomic_plane_disabling(old_plane_state, new_plane_state))
 133                         plane_disabling = true;
 134         }
 135
 136         if (plane_disabling) {
 137                 drm_atomic_helper_wait_for_vblanks(dev, state);
 138
 139                 for_each_old_plane_in_state(state, plane, old_plane_state, i)
 140                         ipu_plane_disable_deferred(plane);
 141
 142         }
 143
 144         drm_atomic_helper_commit_hw_done(state);
 145 }
 146
 147 static const struct drm_mode_config_helper_funcs imx_drm_mode_config_helpers = {
 148         .atomic_commit_tail = imx_drm_atomic_commit_tail,
 149 };
 150
 151
 152 int imx_drm_encoder_parse_of(struct drm_device *drm,
 153         struct drm_encoder *encoder, struct device_node *np)
 154 {
 155         uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
 156
 157         /*
 158          * If we failed to find the CRTC(s) which this encoder is
 159          * supposed to be connected to, it's because the CRTC has
 160          * not been registered yet.  Defer probing, and hope that
 161          * the required CRTC is added later.
 162          */
 163         if (crtc_mask == 0)
 164                 return -EPROBE_DEFER;
 165
 166         encoder->possible_crtcs = crtc_mask;
 167
 168         /* FIXME: this is the mask of outputs which can clone this output. */
 169         encoder->possible_clones = ~0;
 170
 171         return 0;
 172 }
 173 EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
 174
 175 static const struct drm_ioctl_desc imx_drm_ioctls[] = {
 176         /* none so far */
 177 };
 178
 179 static struct drm_driver imx_drm_driver = {
 180         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 181                                   DRIVER_ATOMIC,
 182         .lastclose              = imx_drm_driver_lastclose,
 183         .gem_free_object_unlocked = drm_gem_cma_free_object,
 184         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 185         .dumb_create            = drm_gem_cma_dumb_create,
 186
 187         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 188         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 189         .gem_prime_import       = drm_gem_prime_import,
 190         .gem_prime_export       = drm_gem_prime_export,
 191         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 192         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 193         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 194         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 195         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 196         .ioctls                 = imx_drm_ioctls,
 197         .num_ioctls             = ARRAY_SIZE(imx_drm_ioctls),
 198         .fops                   = &imx_drm_driver_fops,
 199         .name                   = "imx-drm",
 200         .desc                   = "i.MX DRM graphics",
 201         .date                   = "20120507",
 202         .major                  = 1,
 203         .minor                  = 0,
 204         .patchlevel             = 0,
 205 };
 206
 207 static int compare_of(struct device *dev, void *data)
 208 {
 209         struct device_node *np = data;
 210
 211         /* Special case for DI, dev->of_node may not be set yet */
 212         if (strcmp(dev->driver->name, "imx-ipuv3-crtc") == 0) {
 213                 struct ipu_client_platformdata *pdata = dev->platform_data;
 214
 215                 return pdata->of_node == np;
 216         }
 217
 218         /* Special case for LDB, one device for two channels */
 219         if (of_node_cmp(np->name, "lvds-channel") == 0) {
 220                 np = of_get_parent(np);
 221                 of_node_put(np);
 222         }
 223
 224         return dev->of_node == np;
 225 }
 226
 227 static int imx_drm_bind(struct device *dev)
 228 {
 229         struct drm_device *drm;
 230         struct imx_drm_device *imxdrm;
 231         int ret;
 232
 233         drm = drm_dev_alloc(&imx_drm_driver, dev);
 234         if (IS_ERR(drm))
 235                 return PTR_ERR(drm);
 236
 237         imxdrm = devm_kzalloc(dev, sizeof(*imxdrm), GFP_KERNEL);
 238         if (!imxdrm) {
 239                 ret = -ENOMEM;
 240                 goto err_unref;
 241         }
 242
 243         imxdrm->drm = drm;
 244         drm->dev_private = imxdrm;
 245
 246         /*
 247          * enable drm irq mode.
 248          * - with irq_enabled = true, we can use the vblank feature.
 249          *
 250          * P.S. note that we wouldn't use drm irq handler but
 251          *      just specific driver own one instead because
 252          *      drm framework supports only one irq handler and
 253          *      drivers can well take care of their interrupts
 254          */
 255         drm->irq_enabled = true;
 256
 257         /*
 258          * set max width and height as default value(4096x4096).
 259          * this value would be used to check framebuffer size limitation
 260          * at drm_mode_addfb().
 261          */
 262         drm->mode_config.min_width = 1;
 263         drm->mode_config.min_height = 1;
 264         drm->mode_config.max_width = 4096;
 265         drm->mode_config.max_height = 4096;
 266         drm->mode_config.funcs = &imx_drm_mode_config_funcs;
 267         drm->mode_config.helper_private = &imx_drm_mode_config_helpers;
 268
 269         drm_mode_config_init(drm);
 270
 271         ret = drm_vblank_init(drm, MAX_CRTC);
 272         if (ret)
 273                 goto err_kms;
 274
 275         dev_set_drvdata(dev, drm);
 276
 277         /* Now try and bind all our sub-components */
 278         ret = component_bind_all(dev, drm);
 279         if (ret)
 280                 goto err_kms;
 281
 282         drm_mode_config_reset(drm);
 283
 284         /*
 285          * All components are now initialised, so setup the fb helper.
 286          * The fb helper takes copies of key hardware information, so the
 287          * crtcs/connectors/encoders must not change after this point.
 288          */
 289 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 290         if (legacyfb_depth != 16 && legacyfb_depth != 32) {
 291                 dev_warn(dev, "Invalid legacyfb_depth.  Defaulting to 16bpp\n");
 292                 legacyfb_depth = 16;
 293         }
 294         imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth, MAX_CRTC);
 295         if (IS_ERR(imxdrm->fbhelper)) {
 296                 ret = PTR_ERR(imxdrm->fbhelper);
 297                 imxdrm->fbhelper = NULL;
 298                 goto err_unbind;
 299         }
 300 #endif
 301
 302         drm_kms_helper_poll_init(drm);
 303
 304         ret = drm_dev_register(drm, 0);
 305         if (ret)
 306                 goto err_fbhelper;
 307
 308         return 0;
 309
 310 err_fbhelper:
 311         drm_kms_helper_poll_fini(drm);
 312 #if IS_ENABLED(CONFIG_DRM_FBDEV_EMULATION)
 313         if (imxdrm->fbhelper)
 314                 drm_fbdev_cma_fini(imxdrm->fbhelper);
 315 err_unbind:
 316 #endif
 317         component_unbind_all(drm->dev, drm);
 318 err_kms:
 319         drm_mode_config_cleanup(drm);
 320 err_unref:
 321         drm_dev_unref(drm);
 322
 323         return ret;
 324 }
 325
 326 static void imx_drm_unbind(struct device *dev)
 327 {
 328         struct drm_device *drm = dev_get_drvdata(dev);
 329         struct imx_drm_device *imxdrm = drm->dev_private;
 330
 331         drm_dev_unregister(drm);
 332
 333         drm_kms_helper_poll_fini(drm);
 334
 335         if (imxdrm->fbhelper)
 336                 drm_fbdev_cma_fini(imxdrm->fbhelper);
 337
 338         drm_mode_config_cleanup(drm);
 339
 340         component_unbind_all(drm->dev, drm);
 341         dev_set_drvdata(dev, NULL);
 342
 343         drm_dev_unref(drm);
 344 }
 345
 346 static const struct component_master_ops imx_drm_ops = {
 347         .bind = imx_drm_bind,
 348         .unbind = imx_drm_unbind,
 349 };
 350
 351 static int imx_drm_platform_probe(struct platform_device *pdev)
 352 {
 353         int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
 354
 355         if (!ret)
 356                 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 357
 358         return ret;
 359 }
 360
 361 static int imx_drm_platform_remove(struct platform_device *pdev)
 362 {
 363         component_master_del(&pdev->dev, &imx_drm_ops);
 364         return 0;
 365 }
 366
 367 #ifdef CONFIG_PM_SLEEP
 368 static int imx_drm_suspend(struct device *dev)
 369 {
 370         struct drm_device *drm_dev = dev_get_drvdata(dev);
 371         struct imx_drm_device *imxdrm;
 372
 373         /* The drm_dev is NULL before .load hook is called */
 374         if (drm_dev == NULL)
 375                 return 0;
 376
 377         drm_kms_helper_poll_disable(drm_dev);
 378
 379         imxdrm = drm_dev->dev_private;
 380         imxdrm->state = drm_atomic_helper_suspend(drm_dev);
 381         if (IS_ERR(imxdrm->state)) {
 382                 drm_kms_helper_poll_enable(drm_dev);
 383                 return PTR_ERR(imxdrm->state);
 384         }
 385
 386         return 0;
 387 }
 388
 389 static int imx_drm_resume(struct device *dev)
 390 {
 391         struct drm_device *drm_dev = dev_get_drvdata(dev);
 392         struct imx_drm_device *imx_drm;
 393
 394         if (drm_dev == NULL)
 395                 return 0;
 396
 397         imx_drm = drm_dev->dev_private;
 398         drm_atomic_helper_resume(drm_dev, imx_drm->state);
 399         drm_kms_helper_poll_enable(drm_dev);
 400
 401         return 0;
 402 }
 403 #endif
 404
 405 static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
 406
 407 static const struct of_device_id imx_drm_dt_ids[] = {
 408         { .compatible = "fsl,imx-display-subsystem", },
 409         { /* sentinel */ },
 410 };
 411 MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
 412
 413 static struct platform_driver imx_drm_pdrv = {
 414         .probe          = imx_drm_platform_probe,
 415         .remove         = imx_drm_platform_remove,
 416         .driver         = {
 417                 .name   = "imx-drm",
 418                 .pm     = &imx_drm_pm_ops,
 419                 .of_match_table = imx_drm_dt_ids,
 420         },
 421 };
 422
 423 static struct platform_driver * const drivers[] = {
 424         &imx_drm_pdrv,
 425         &ipu_drm_driver,
 426 };
 427
 428 static int __init imx_drm_init(void)
 429 {
 430         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 431 }
 432 module_init(imx_drm_init);
 433
 434 static void __exit imx_drm_exit(void)
 435 {
 436         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 437 }
 438 module_exit(imx_drm_exit);
 439
 440 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 441 MODULE_DESCRIPTION("i.MX drm driver core");
 442 MODULE_LICENSE("GPL");