text: /*
   * drivers/gpu/drm/omapdrm/omap_drv.c
   *
   * Copyright (C) 2011 Texas Instruments
   * Author: Rob Clark <rob@ti.com>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 as published by
   * the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   * more details.
   *
   * You should have received a copy of the GNU General Public License along with
   * this program.  If not, see <http://www.gnu.org/licenses/>.
   */
  
  #include <linux/sys_soc.h>
  
  #include <drm/drm_atomic.h>
  #include <drm/drm_atomic_helper.h>
  #include <drm/drm_crtc_helper.h>
  #include <drm/drm_fb_helper.h>
  
  #include "omap_dmm_tiler.h"
  #include "omap_drv.h"
  
  #define DRIVER_NAME		MODULE_NAME
  #define DRIVER_DESC		"OMAP DRM"
  #define DRIVER_DATE		"20110917"
  #define DRIVER_MAJOR		1
  #define DRIVER_MINOR		0
  #define DRIVER_PATCHLEVEL	0
  
  /*
   * mode config funcs
   */
  
  /* Notes about mapping DSS and DRM entities:
   *    CRTC:        overlay
   *    encoder:     manager.. with some extension to allow one primary CRTC
   *                 and zero or more video CRTC's to be mapped to one encoder?
   *    connector:   dssdev.. manager can be attached/detached from different
   *                 devices
   */
  
  static void omap_fb_output_poll_changed(struct drm_device *dev)
  {
  	struct omap_drm_private *priv = dev->dev_private;
  	DBG("dev=%p", dev);
  	if (priv->fbdev)
  		drm_fb_helper_hotplug_event(priv->fbdev);
  }
  
  static void omap_atomic_wait_for_completion(struct drm_device *dev,
  					    struct drm_atomic_state *old_state)
  {
  	struct drm_crtc_state *new_crtc_state;
  	struct drm_crtc *crtc;
  	unsigned int i;
  	int ret;
  
  	for_each_new_crtc_in_state(old_state, crtc, new_crtc_state, i) {
  		if (!new_crtc_state->active)
  			continue;
  
  		ret = omap_crtc_wait_pending(crtc);
  
  		if (!ret)
  			dev_warn(dev->dev,
  				 "atomic complete timeout (pipe %u)!\n", i);
  	}
  }
  
  static void omap_atomic_commit_tail(struct drm_atomic_state *old_state)
  {
  	struct drm_device *dev = old_state->dev;
  	struct omap_drm_private *priv = dev->dev_private;
  
  	priv->dispc_ops->runtime_get();
  
  	/* Apply the atomic update. */
  	drm_atomic_helper_commit_modeset_disables(dev, old_state);
  
  	if (priv->omaprev != 0x3430) {
  		/* With the current dss dispc implementation we have to enable
  		 * the new modeset before we can commit planes. The dispc ovl
  		 * configuration relies on the video mode configuration been
  		 * written into the HW when the ovl configuration is
  		 * calculated.
  		 *
  		 * This approach is not ideal because after a mode change the
  		 * plane update is executed only after the first vblank
  		 * interrupt. The dispc implementation should be fixed so that
  		 * it is able use uncommitted drm state information.
  		 */
  		drm_atomic_helper_commit_modeset_enables(dev, old_state);
  		omap_atomic_wait_for_completion(dev, old_state);
  
  		drm_atomic_helper_commit_planes(dev, old_state, 0);
  
  		drm_atomic_helper_commit_hw_done(old_state);
  	} else {
  		/*
  		 * OMAP3 DSS seems to have issues with the work-around above,
  		 * resulting in endless sync losts if a crtc is enabled without
  		 * a plane. For now, skip the WA for OMAP3.
  		 */
  		drm_atomic_helper_commit_planes(dev, old_state, 0);
  
  		drm_atomic_helper_commit_modeset_enables(dev, old_state);
  
  		drm_atomic_helper_commit_hw_done(old_state);
  	}
  
  	/*
  	 * Wait for completion of the page flips to ensure that old buffers
  	 * can't be touched by the hardware anymore before cleaning up planes.
  	 */
  	omap_atomic_wait_for_completion(dev, old_state);
  
  	drm_atomic_helper_cleanup_planes(dev, old_state);
  
  	priv->dispc_ops->runtime_put();
  }
  
  static const struct drm_mode_config_helper_funcs omap_mode_config_helper_funcs = {
  	.atomic_commit_tail = omap_atomic_commit_tail,
  };
  
  static const struct drm_mode_config_funcs omap_mode_config_funcs = {
  	.fb_create = omap_framebuffer_create,
  	.output_poll_changed = omap_fb_output_poll_changed,
  	.atomic_check = drm_atomic_helper_check,
  	.atomic_commit = drm_atomic_helper_commit,
  };
  
  static int get_connector_type(struct omap_dss_device *dssdev)
  {
  	switch (dssdev->type) {
  	case OMAP_DISPLAY_TYPE_HDMI:
  		return DRM_MODE_CONNECTOR_HDMIA;
  	case OMAP_DISPLAY_TYPE_DVI:
  		return DRM_MODE_CONNECTOR_DVID;
  	case OMAP_DISPLAY_TYPE_DSI:
  		return DRM_MODE_CONNECTOR_DSI;
  	case OMAP_DISPLAY_TYPE_DPI:
  	case OMAP_DISPLAY_TYPE_DBI:
  		return DRM_MODE_CONNECTOR_DPI;
  	case OMAP_DISPLAY_TYPE_VENC:
  		/* TODO: This could also be composite */
  		return DRM_MODE_CONNECTOR_SVIDEO;
  	case OMAP_DISPLAY_TYPE_SDI:
  		return DRM_MODE_CONNECTOR_LVDS;
  	default:
  		return DRM_MODE_CONNECTOR_Unknown;
  	}
  }
  
  static void omap_disconnect_dssdevs(void)
  {
  	struct omap_dss_device *dssdev = NULL;
  
  	for_each_dss_dev(dssdev)
  		dssdev->driver->disconnect(dssdev);
  }
  
  static int omap_connect_dssdevs(void)
  {
  	int r;
  	struct omap_dss_device *dssdev = NULL;
  
  	if (!omapdss_stack_is_ready())
  		return -EPROBE_DEFER;
  
  	for_each_dss_dev(dssdev) {
  		r = dssdev->driver->connect(dssdev);
  		if (r == -EPROBE_DEFER) {
  			omap_dss_put_device(dssdev);
  			goto cleanup;
  		} else if (r) {
  			dev_warn(dssdev->dev, "could not connect display: %s\n",
  				dssdev->name);
  		}
  	}
  
  	return 0;
  
  cleanup:
  	/*
  	 * if we are deferring probe, we disconnect the devices we previously
  	 * connected
  	 */
  	omap_disconnect_dssdevs();
  
  	return r;
  }
  
  static int omap_modeset_init_properties(struct drm_device *dev)
  {
  	struct omap_drm_private *priv = dev->dev_private;
  	unsigned int num_planes = priv->dispc_ops->get_num_ovls();
  
  	priv->zorder_prop = drm_property_create_range(dev, 0, "zorder", 0,
  						      num_planes - 1);
  	if (!priv->zorder_prop)
  		return -ENOMEM;
  
  	return 0;
  }
  
  static int omap_modeset_init(struct drm_device *dev)
  {
  	struct omap_drm_private *priv = dev->dev_private;
  	struct omap_dss_device *dssdev = NULL;
  	int num_ovls = priv->dispc_ops->get_num_ovls();
  	int num_mgrs = priv->dispc_ops->get_num_mgrs();
  	int num_crtcs, crtc_idx, plane_idx;
  	int ret;
  	u32 plane_crtc_mask;
  
  	drm_mode_config_init(dev);
  
  	ret = omap_modeset_init_properties(dev);
  	if (ret < 0)
  		return ret;
  
  	/*
  	 * This function creates exactly one connector, encoder, crtc,
  	 * and primary plane per each connected dss-device. Each
  	 * connector->encoder->crtc chain is expected to be separate
  	 * and each crtc is connect to a single dss-channel. If the
  	 * configuration does not match the expectations or exceeds
  	 * the available resources, the configuration is rejected.
  	 */
  	num_crtcs = 0;
  	for_each_dss_dev(dssdev)
  		if (omapdss_device_is_connected(dssdev))
  			num_crtcs++;
  
  	if (num_crtcs > num_mgrs || num_crtcs > num_ovls ||
  	    num_crtcs > ARRAY_SIZE(priv->crtcs) ||
  	    num_crtcs > ARRAY_SIZE(priv->planes) ||
  	    num_crtcs > ARRAY_SIZE(priv->encoders) ||
  	    num_crtcs > ARRAY_SIZE(priv->connectors)) {
  		dev_err(dev->dev, "%s(): Too many connected displays\n",
  			__func__);
  		return -EINVAL;
  	}
  
  	/* All planes can be put to any CRTC */
  	plane_crtc_mask = (1 << num_crtcs) - 1;
  
  	dssdev = NULL;
  
  	crtc_idx = 0;
  	plane_idx = 0;
  	for_each_dss_dev(dssdev) {
  		struct drm_connector *connector;
  		struct drm_encoder *encoder;
  		struct drm_plane *plane;
  		struct drm_crtc *crtc;
  
  		if (!omapdss_device_is_connected(dssdev))
  			continue;
  
  		encoder = omap_encoder_init(dev, dssdev);
  		if (!encoder)
  			return -ENOMEM;
  
  		connector = omap_connector_init(dev,
  				get_connector_type(dssdev), dssdev, encoder);
  		if (!connector)
  			return -ENOMEM;
  
  		plane = omap_plane_init(dev, plane_idx, DRM_PLANE_TYPE_PRIMARY,
  					plane_crtc_mask);
  		if (IS_ERR(plane))
  			return PTR_ERR(plane);
  
  		crtc = omap_crtc_init(dev, plane, dssdev);
  		if (IS_ERR(crtc))
  			return PTR_ERR(crtc);
  
  		drm_mode_connector_attach_encoder(connector, encoder);
  		encoder->possible_crtcs = (1 << crtc_idx);
  
  		priv->crtcs[priv->num_crtcs++] = crtc;
  		priv->planes[priv->num_planes++] = plane;
  		priv->encoders[priv->num_encoders++] = encoder;
  		priv->connectors[priv->num_connectors++] = connector;
  
  		plane_idx++;
  		crtc_idx++;
  	}
  
  	/*
  	 * Create normal planes for the remaining overlays:
  	 */
  	for (; plane_idx < num_ovls; plane_idx++) {
  		struct drm_plane *plane;
  
  		if (WARN_ON(priv->num_planes >= ARRAY_SIZE(priv->planes)))
  			return -EINVAL;
  
  		plane = omap_plane_init(dev, plane_idx, DRM_PLANE_TYPE_OVERLAY,
  			plane_crtc_mask);
  		if (IS_ERR(plane))
  			return PTR_ERR(plane);
  
  		priv->planes[priv->num_planes++] = plane;
  	}
  
  	DBG("registered %d planes, %d crtcs, %d encoders and %d connectors\n",
  		priv->num_planes, priv->num_crtcs, priv->num_encoders,
  		priv->num_connectors);
  
  	dev->mode_config.min_width = 8;
  	dev->mode_config.min_height = 2;
  
  	/* note: eventually will need some cpu_is_omapXYZ() type stuff here
  	 * to fill in these limits properly on different OMAP generations..
  	 */
  	dev->mode_config.max_width = 2048;
  	dev->mode_config.max_height = 2048;
  
  	dev->mode_config.funcs = &omap_mode_config_funcs;
  	dev->mode_config.helper_private = &omap_mode_config_helper_funcs;
  
  	drm_mode_config_reset(dev);
  
  	omap_drm_irq_install(dev);
  
  	return 0;
  }
  
  /*
   * Enable the HPD in external components if supported
   */
  static void omap_modeset_enable_external_hpd(void)
  {
  	struct omap_dss_device *dssdev = NULL;
  
  	for_each_dss_dev(dssdev) {
  		if (dssdev->driver->enable_hpd)
  			dssdev->driver->enable_hpd(dssdev);
  	}
  }
  
  /*
   * Disable the HPD in external components if supported
   */
  static void omap_modeset_disable_external_hpd(void)
  {
  	struct omap_dss_device *dssdev = NULL;
  
  	for_each_dss_dev(dssdev) {
  		if (dssdev->driver->disable_hpd)
  			dssdev->driver->disable_hpd(dssdev);
  	}
  }
  
  /*
   * drm ioctl funcs
   */
  
  
  static int ioctl_get_param(struct drm_device *dev, void *data,
  		struct drm_file *file_priv)
  {
  	struct omap_drm_private *priv = dev->dev_private;
  	struct drm_omap_param *args = data;
  
  	DBG("%p: param=%llu", dev, args->param);
  
  	switch (args->param) {
  	case OMAP_PARAM_CHIPSET_ID:
  		args->value = priv->omaprev;
  		break;
  	default:
  		DBG("unknown parameter %lld", args->param);
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  static int ioctl_set_param(struct drm_device *dev, void *data,
  		struct drm_file *file_priv)
  {
  	struct drm_omap_param *args = data;
  
  	switch (args->param) {
  	default:
  		DBG("unknown parameter %lld", args->param);
  		return -EINVAL;
  	}
  
  	return 0;
  }
  
  #define OMAP_BO_USER_MASK	0x00ffffff	/* flags settable by userspace */
  
  static int ioctl_gem_new(struct drm_device *dev, void *data,
  		struct drm_file *file_priv)
  {
  	struct drm_omap_gem_new *args = data;
  	u32 flags = args->flags & OMAP_BO_USER_MASK;
  
  	VERB("%p:%p: size=0x%08x, flags=%08x", dev, file_priv,
  	     args->size.bytes, flags);
  
  	return omap_gem_new_handle(dev, file_priv, args->size, flags,
  				   &args->handle);
  }
  
  static int ioctl_gem_info(struct drm_device *dev, void *data,
  		struct drm_file *file_priv)
  {
  	struct drm_omap_gem_info *args = data;
  	struct drm_gem_object *obj;
  	int ret = 0;
  
  	VERB("%p:%p: handle=%d", dev, file_priv, args->handle);
  
  	obj = drm_gem_object_lookup(file_priv, args->handle);
  	if (!obj)
  		return -ENOENT;
  
  	args->size = omap_gem_mmap_size(obj);
  	args->offset = omap_gem_mmap_offset(obj);
  
  	drm_gem_object_unreference_unlocked(obj);
  
  	return ret;
  }
  
  static const struct drm_ioctl_desc ioctls[DRM_COMMAND_END - DRM_COMMAND_BASE] = {
  	DRM_IOCTL_DEF_DRV(OMAP_GET_PARAM, ioctl_get_param,
  			  DRM_AUTH | DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(OMAP_SET_PARAM, ioctl_set_param,
  			  DRM_AUTH | DRM_MASTER | DRM_ROOT_ONLY),
  	DRM_IOCTL_DEF_DRV(OMAP_GEM_NEW, ioctl_gem_new,
  			  DRM_AUTH | DRM_RENDER_ALLOW),
  	/* Deprecated, to be removed. */
  	DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_PREP, drm_noop,
  			  DRM_AUTH | DRM_RENDER_ALLOW),
  	/* Deprecated, to be removed. */
  	DRM_IOCTL_DEF_DRV(OMAP_GEM_CPU_FINI, drm_noop,
  			  DRM_AUTH | DRM_RENDER_ALLOW),
  	DRM_IOCTL_DEF_DRV(OMAP_GEM_INFO, ioctl_gem_info,
  			  DRM_AUTH | DRM_RENDER_ALLOW),
  };
  
  /*
   * drm driver funcs
   */
  
  static int dev_open(struct drm_device *dev, struct drm_file *file)
  {
  	file->driver_priv = NULL;
  
  	DBG("open: dev=%p, file=%p", dev, file);
  
  	return 0;
  }
  
  /**
   * lastclose - clean up after all DRM clients have exited
   * @dev: DRM device
   *
   * Take care of cleaning up after all DRM clients have exited.  In the
   * mode setting case, we want to restore the kernel's initial mode (just
   * in case the last client left us in a bad state).
   */
  static void dev_lastclose(struct drm_device *dev)
  {
  	struct omap_drm_private *priv = dev->dev_private;
  	int ret;
  
  	DBG("lastclose: dev=%p", dev);
  
  	if (priv->fbdev) {
  		ret = drm_fb_helper_restore_fbdev_mode_unlocked(priv->fbdev);
  		if (ret)
  			DBG("failed to restore crtc mode");
  	}
  }
  
  static const struct vm_operations_struct omap_gem_vm_ops = {
  	.fault = omap_gem_fault,
  	.open = drm_gem_vm_open,
  	.close = drm_gem_vm_close,
  };
  
  static const struct file_operations omapdriver_fops = {
  	.owner = THIS_MODULE,
  	.open = drm_open,
  	.unlocked_ioctl = drm_ioctl,
  	.compat_ioctl = drm_compat_ioctl,
  	.release = drm_release,
  	.mmap = omap_gem_mmap,
  	.poll = drm_poll,
  	.read = drm_read,
  	.llseek = noop_llseek,
  };
  
  static struct drm_driver omap_drm_driver = {
  	.driver_features = DRIVER_MODESET | DRIVER_GEM  | DRIVER_PRIME |
  		DRIVER_ATOMIC | DRIVER_RENDER,
  	.open = dev_open,
  	.lastclose = dev_lastclose,
  #ifdef CONFIG_DEBUG_FS
  	.debugfs_init = omap_debugfs_init,
  #endif
  	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  	.gem_prime_export = omap_gem_prime_export,
  	.gem_prime_import = omap_gem_prime_import,
  	.gem_free_object = omap_gem_free_object,
  	.gem_vm_ops = &omap_gem_vm_ops,
  	.dumb_create = omap_gem_dumb_create,
  	.dumb_map_offset = omap_gem_dumb_map_offset,
  	.ioctls = ioctls,
  	.num_ioctls = DRM_OMAP_NUM_IOCTLS,
  	.fops = &omapdriver_fops,
  	.name = DRIVER_NAME,
  	.desc = DRIVER_DESC,
  	.date = DRIVER_DATE,
  	.major = DRIVER_MAJOR,
  	.minor = DRIVER_MINOR,
  	.patchlevel = DRIVER_PATCHLEVEL,
  };
  
  static const struct soc_device_attribute omapdrm_soc_devices[] = {
  	{ .family = "OMAP3", .data = (void *)0x3430 },
  	{ .family = "OMAP4", .data = (void *)0x4430 },
  	{ .family = "OMAP5", .data = (void *)0x5430 },
  	{ .family = "DRA7",  .data = (void *)0x0752 },
  	{ /* sentinel */ }
  };
  
  static int pdev_probe(struct platform_device *pdev)
  {
  	const struct soc_device_attribute *soc;
  	struct omap_drm_private *priv;
  	struct drm_device *ddev;
  	unsigned int i;
  	int ret;
  
  	DBG("%s", pdev->name);
  
  	if (omapdss_is_initialized() == false)
  		return -EPROBE_DEFER;
  
  	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
  	if (ret) {
  		dev_err(&pdev->dev, "Failed to set the DMA mask\n");
  		return ret;
  	}
  
  	omap_crtc_pre_init();
  
  	ret = omap_connect_dssdevs();
  	if (ret)
  		goto err_crtc_uninit;
  
  	/* Allocate and initialize the driver private structure. */
  	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  	if (!priv) {
  		ret = -ENOMEM;
  		goto err_disconnect_dssdevs;
  	}
  
  	priv->dispc_ops = dispc_get_ops();
  
  	soc = soc_device_match(omapdrm_soc_devices);
  	priv->omaprev = soc ? (unsigned int)soc->data : 0;
  	priv->wq = alloc_ordered_workqueue("omapdrm", 0);
  
  	spin_lock_init(&priv->list_lock);
  	INIT_LIST_HEAD(&priv->obj_list);
  
  	/* Allocate and initialize the DRM device. */
  	ddev = drm_dev_alloc(&omap_drm_driver, &pdev->dev);
  	if (IS_ERR(ddev)) {
  		ret = PTR_ERR(ddev);
  		goto err_free_priv;
  	}
  
  	ddev->dev_private = priv;
  	platform_set_drvdata(pdev, ddev);
  
  	omap_gem_init(ddev);
  
  	ret = omap_modeset_init(ddev);
  	if (ret) {
  		dev_err(&pdev->dev, "omap_modeset_init failed: ret=%d\n", ret);
  		goto err_free_drm_dev;
  	}
  
  	/* Initialize vblank handling, start with all CRTCs disabled. */
  	ret = drm_vblank_init(ddev, priv->num_crtcs);
  	if (ret) {
  		dev_err(&pdev->dev, "could not init vblank\n");
  		goto err_cleanup_modeset;
  	}
  
  	for (i = 0; i < priv->num_crtcs; i++)
  		drm_crtc_vblank_off(priv->crtcs[i]);
  
  	priv->fbdev = omap_fbdev_init(ddev);
  
  	drm_kms_helper_poll_init(ddev);
  	omap_modeset_enable_external_hpd();
  
  	/*
  	 * Register the DRM device with the core and the connectors with
  	 * sysfs.
  	 */
  	ret = drm_dev_register(ddev, 0);
  	if (ret)
  		goto err_cleanup_helpers;
  
  	return 0;
  
  err_cleanup_helpers:
  	omap_modeset_disable_external_hpd();
  	drm_kms_helper_poll_fini(ddev);
  	if (priv->fbdev)
  		omap_fbdev_free(ddev);
  err_cleanup_modeset:
  	drm_mode_config_cleanup(ddev);
  	omap_drm_irq_uninstall(ddev);
  err_free_drm_dev:
  	omap_gem_deinit(ddev);
  	drm_dev_unref(ddev);
  err_free_priv:
  	destroy_workqueue(priv->wq);
  	kfree(priv);
  err_disconnect_dssdevs:
  	omap_disconnect_dssdevs();
  err_crtc_uninit:
  	omap_crtc_pre_uninit();
  	return ret;
  }
  
  static int pdev_remove(struct platform_device *pdev)
  {
  	struct drm_device *ddev = platform_get_drvdata(pdev);
  	struct omap_drm_private *priv = ddev->dev_private;
  
  	DBG("");
  
  	drm_dev_unregister(ddev);
  
  	omap_modeset_disable_external_hpd();
  	drm_kms_helper_poll_fini(ddev);
  
  	if (priv->fbdev)
  		omap_fbdev_free(ddev);
  
  	drm_atomic_helper_shutdown(ddev);
  
  	drm_mode_config_cleanup(ddev);
  
  	omap_drm_irq_uninstall(ddev);
  	omap_gem_deinit(ddev);
  
  	drm_dev_unref(ddev);
  
  	destroy_workqueue(priv->wq);
  	kfree(priv);
  
  	omap_disconnect_dssdevs();
  	omap_crtc_pre_uninit();
  
  	return 0;
  }
  
  #ifdef CONFIG_PM_SLEEP
  static int omap_drm_suspend_all_displays(void)
  {
  	struct omap_dss_device *dssdev = NULL;
  
  	for_each_dss_dev(dssdev) {
  		if (!dssdev->driver)
  			continue;
  
  		if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
  			dssdev->driver->disable(dssdev);
  			dssdev->activate_after_resume = true;
  		} else {
  			dssdev->activate_after_resume = false;
  		}
  	}
  
  	return 0;
  }
  
  static int omap_drm_resume_all_displays(void)
  {
  	struct omap_dss_device *dssdev = NULL;
  
  	for_each_dss_dev(dssdev) {
  		if (!dssdev->driver)
  			continue;
  
  		if (dssdev->activate_after_resume) {
  			dssdev->driver->enable(dssdev);
  			dssdev->activate_after_resume = false;
  		}
  	}
  
  	return 0;
  }
  
  static int omap_drm_suspend(struct device *dev)
  {
  	struct drm_device *drm_dev = dev_get_drvdata(dev);
  
  	drm_kms_helper_poll_disable(drm_dev);
  
  	drm_modeset_lock_all(drm_dev);
  	omap_drm_suspend_all_displays();
  	drm_modeset_unlock_all(drm_dev);
  
  	return 0;
  }
  
  static int omap_drm_resume(struct device *dev)
  {
  	struct drm_device *drm_dev = dev_get_drvdata(dev);
  
  	drm_modeset_lock_all(drm_dev);
  	omap_drm_resume_all_displays();
  	drm_modeset_unlock_all(drm_dev);
  
  	drm_kms_helper_poll_enable(drm_dev);
  
  	return omap_gem_resume(dev);
  }
  #endif
  
  static SIMPLE_DEV_PM_OPS(omapdrm_pm_ops, omap_drm_suspend, omap_drm_resume);
  
  static struct platform_driver pdev = {
  	.driver = {
  		.name = "omapdrm",
  		.pm = &omapdrm_pm_ops,
  	},
  	.probe = pdev_probe,
  	.remove = pdev_remove,
  };
  
  static struct platform_driver * const drivers[] = {
  	&omap_dmm_driver,
  	&pdev,
  };
  
  static int __init omap_drm_init(void)
  {
  	DBG("init");
  
  	return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
  }
  
  static void __exit omap_drm_fini(void)
  {
  	DBG("fini");
  
  	platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
  }
  
  /* need late_initcall() so we load after dss_driver's are loaded */
  late_initcall(omap_drm_init);
  module_exit(omap_drm_fini);
  
  MODULE_AUTHOR("Rob Clark <rob@ti.com>");
  MODULE_DESCRIPTION("OMAP DRM Display Driver");
  MODULE_ALIAS("platform:" DRIVER_NAME);
  MODULE_LICENSE("GPL v2");
  