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