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