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