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