static int i915_drm_freeze(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv;
	int error;

	dev_priv = dev->dev_private;
	drm_kms_helper_poll_disable(dev);

#if 0
	pci_save_state(dev->pdev);
#endif

	DRM_LOCK(dev);
	/* If KMS is active, we do the leavevt stuff here */
	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
		error = -i915_gem_idle(dev);
		if (error) {
			DRM_UNLOCK(dev);
			device_printf(dev->device,
			    "GEM idle failed, resume might fail\n");
			return (error);
		}
		drm_irq_uninstall(dev);
	}

	i915_save_state(dev);

	intel_opregion_fini(dev);

	/* Modeset on resume, not lid events */
	dev_priv->modeset_on_lid = 0;
	DRM_UNLOCK(dev);

	return 0;
}

static int i915_drm_freeze(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;

	drm_kms_helper_poll_disable(dev);

	pci_save_state(dev->pdev);

	/* If KMS is active, we do the leavevt stuff here */
	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
		int error = i915_gem_idle(dev);
		if (error) {
			dev_err(&dev->pdev->dev,
				"GEM idle failed, resume might fail\n");
			return error;
		}
		drm_irq_uninstall(dev);
	}

	i915_save_state(dev);

	intel_opregion_fini(dev);

	/* Modeset on resume, not lid events */
	dev_priv->modeset_on_lid = 0;

	console_lock();
	intel_fbdev_set_suspend(dev, 1);
	console_unlock();

	return 0;
}

static int fsl_dcu_drm_pm_suspend(struct device *dev)
{
	struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);

	if (!fsl_dev)
		return 0;

	disable_irq(fsl_dev->irq);
	drm_kms_helper_poll_disable(fsl_dev->drm);

	console_lock();
	drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 1);
	console_unlock();

	fsl_dev->state = drm_atomic_helper_suspend(fsl_dev->drm);
	if (IS_ERR(fsl_dev->state)) {
		console_lock();
		drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
		console_unlock();

		drm_kms_helper_poll_enable(fsl_dev->drm);
		enable_irq(fsl_dev->irq);
		return PTR_ERR(fsl_dev->state);
	}

	clk_disable_unprepare(fsl_dev->pix_clk);
	clk_disable_unprepare(fsl_dev->clk);

	return 0;
}

int i915_suspend(struct drm_device *dev, pm_message_t state)
{
	int error;

	if (!dev || !dev->dev_private) {
		DRM_ERROR("dev: %p\n", dev);
		DRM_ERROR("DRM not initialized, aborting suspend.\n");
		return -ENODEV;
	}

	if (state.event == PM_EVENT_PRETHAW)
		return 0;

	drm_kms_helper_poll_disable(dev);

	error = i915_drm_freeze(dev);
	if (error)
		return error;

	if (state.event == PM_EVENT_SUSPEND) {
		/* Shut down the device */
		pci_disable_device(dev->pdev);
		pci_set_power_state(dev->pdev, PCI_D3hot);
	}

	return 0;
}

static int i915_drm_freeze(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc;

	intel_runtime_pm_get(dev_priv);

	/* ignore lid events during suspend */
	mutex_lock(&dev_priv->modeset_restore_lock);
	dev_priv->modeset_restore = MODESET_SUSPENDED;
	mutex_unlock(&dev_priv->modeset_restore_lock);

	/* We do a lot of poking in a lot of registers, make sure they work
	 * properly. */
	hsw_disable_package_c8(dev_priv);
	intel_display_set_init_power(dev, true);

	drm_kms_helper_poll_disable(dev);

	pci_save_state(dev->pdev);

	/* If KMS is active, we do the leavevt stuff here */
	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
		int error;

		error = i915_gem_suspend(dev);
		if (error) {
			dev_err(&dev->pdev->dev,
				"GEM idle failed, resume might fail\n");
			return error;
		}

		cancel_delayed_work_sync(&dev_priv->rps.delayed_resume_work);

		drm_irq_uninstall(dev);
		dev_priv->enable_hotplug_processing = false;
		/*
		 * Disable CRTCs directly since we want to preserve sw state
		 * for _thaw.
		 */
		mutex_lock(&dev->mode_config.mutex);
		list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
			dev_priv->display.crtc_disable(crtc);
		mutex_unlock(&dev->mode_config.mutex);

		intel_modeset_suspend_hw(dev);
	}

	i915_gem_suspend_gtt_mappings(dev);

	i915_save_state(dev);

	intel_opregion_fini(dev);

	console_lock();
	intel_fbdev_set_suspend(dev, FBINFO_STATE_SUSPENDED);
	console_unlock();

	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);

	return 0;
}

static int udl_usb_suspend(struct usb_interface *interface,
			   pm_message_t message)
{
	struct drm_device *dev = usb_get_intfdata(interface);

	drm_kms_helper_poll_disable(dev);
	return 0;
}

static int shmob_drm_pm_suspend(struct device *dev)
{
	struct shmob_drm_device *sdev = dev_get_drvdata(dev);

	drm_kms_helper_poll_disable(sdev->ddev);
	shmob_drm_crtc_suspend(&sdev->crtc);

	return 0;
}

static void udl_usb_disconnect(struct usb_interface *interface)
{
	struct drm_device *dev = usb_get_intfdata(interface);

	drm_kms_helper_poll_disable(dev);
	udl_fbdev_unplug(dev);
	udl_drop_usb(dev);
	drm_unplug_dev(dev);
}

static int __maybe_unused xylon_drm_pm_suspend(struct device *dev)
{
	struct xylon_drm_device *xdev = dev_get_drvdata(dev);

	drm_kms_helper_poll_disable(xdev->dev);
	drm_helper_connector_dpms(xdev->connector, DRM_MODE_DPMS_SUSPEND);

	return 0;
}

static int ast_drm_freeze(struct drm_device *dev)
{
	drm_kms_helper_poll_disable(dev);

	pci_save_state(dev->pdev);

	console_lock();
	ast_fbdev_set_suspend(dev, 1);
	console_unlock();
	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 vbox_drm_freeze(struct drm_device *dev)
{
	struct vbox_private *vbox = dev->dev_private;

	drm_kms_helper_poll_disable(dev);

	pci_save_state(dev->pdev);

	drm_fb_helper_set_suspend_unlocked(&vbox->fbdev->helper, true);

	return 0;
}

static int bochs_pm_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct drm_device *drm_dev = pci_get_drvdata(pdev);
	struct bochs_device *bochs = drm_dev->dev_private;

	drm_kms_helper_poll_disable(drm_dev);

	drm_fb_helper_set_suspend_unlocked(&bochs->fb.helper, 1);

	return 0;
}

static int fsl_dcu_drm_pm_suspend(struct device *dev)
{
	struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);

	if (!fsl_dev)
		return 0;

	drm_kms_helper_poll_disable(fsl_dev->drm);
	regcache_cache_only(fsl_dev->regmap, true);
	regcache_mark_dirty(fsl_dev->regmap);
	clk_disable(fsl_dev->clk);
	clk_unprepare(fsl_dev->clk);

	return 0;
}

static void nouveau_switcheroo_set_state(struct pci_dev *pdev,
					 enum vga_switcheroo_state state)
{
	struct drm_device *dev = pci_get_drvdata(pdev);
	pm_message_t pmm = { .event = PM_EVENT_SUSPEND };
	if (state == VGA_SWITCHEROO_ON) {
		printk(KERN_ERR "VGA switcheroo: switched nouveau on\n");
		nouveau_pci_resume(pdev);
		drm_kms_helper_poll_enable(dev);
	} else {
		printk(KERN_ERR "VGA switcheroo: switched nouveau off\n");
		drm_kms_helper_poll_disable(dev);
		nouveau_pci_suspend(pdev, pmm);
	}
}

static int i915_drm_freeze(struct drm_device *dev)
{
	struct drm_i915_private *dev_priv = dev->dev_private;
	struct drm_crtc *crtc;

	intel_runtime_pm_get(dev_priv);

	/* ignore lid events during suspend */
	mutex_lock(&dev_priv->modeset_restore_lock);
	dev_priv->modeset_restore = MODESET_SUSPENDED;
	mutex_unlock(&dev_priv->modeset_restore_lock);

	/* We do a lot of poking in a lot of registers, make sure they work
	 * properly. */
	intel_display_set_init_power(dev_priv, true);

	drm_kms_helper_poll_disable(dev);

	pci_save_state(dev->pdev);

	/* If KMS is active, we do the leavevt stuff here */
	if (drm_core_check_feature(dev, DRIVER_MODESET)) {
		int error;

		error = i915_gem_suspend(dev);
		if (error) {
			dev_err(&dev->pdev->dev,
				"GEM idle failed, resume might fail\n");
			return error;
		}

		intel_disable_gt_powersave(dev);

		/*
		 * Disable CRTCs directly since we want to preserve sw state
		 * for _thaw.
		 */
		drm_modeset_lock_all(dev);
		for_each_crtc(dev, crtc) {
			dev_priv->display.crtc_disable(crtc);
		}
		drm_modeset_unlock_all(dev);

		intel_dp_mst_suspend(dev);
		drm_irq_uninstall(dev);

		intel_modeset_suspend_hw(dev);
	}

static int cirrus_pm_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct drm_device *drm_dev = pci_get_drvdata(pdev);
	struct cirrus_device *cdev = drm_dev->dev_private;

	drm_kms_helper_poll_disable(drm_dev);

	if (cdev->mode_info.gfbdev) {
		console_lock();
		fb_set_suspend(cdev->mode_info.gfbdev->helper.fbdev, 1);
		console_unlock();
	}

	return 0;
}

static int bochs_pm_suspend(struct device *dev)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct drm_device *drm_dev = pci_get_drvdata(pdev);
	struct bochs_device *bochs = drm_dev->dev_private;

	drm_kms_helper_poll_disable(drm_dev);

	if (bochs->fb.initialized) {
		console_lock();
		drm_fb_helper_set_suspend(&bochs->fb.helper, 1);
		console_unlock();
	}

	return 0;
}

static __maybe_unused int drv_suspend(struct device *dev)
{
	struct drm_device *ddev = dev_get_drvdata(dev);
	struct ltdc_device *ldev = ddev->dev_private;
	struct drm_atomic_state *state;

	drm_kms_helper_poll_disable(ddev);
	state = drm_atomic_helper_suspend(ddev);
	if (IS_ERR(state)) {
		drm_kms_helper_poll_enable(ddev);
		return PTR_ERR(state);
	}
	ldev->suspend_state = state;
	ltdc_suspend(ddev);

	return 0;
}