drm: add support for passing state into the suspend hooks.

fix i915 driver to use state for hibernate save avoidance.
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/char/drm/drmP.h

@@ -568,7 +568,7 @@ struct drm_driver {
 	void (*postclose) (struct drm_device *, struct drm_file *);
 	void (*lastclose) (struct drm_device *);
 	int (*unload) (struct drm_device *);
-	int (*suspend) (struct drm_device *);
+	int (*suspend) (struct drm_device *, pm_message_t state);
 	int (*resume) (struct drm_device *);
 	int (*dma_ioctl) (struct drm_device *dev, void *data, struct drm_file *file_priv);
 	void (*dma_ready) (struct drm_device *);

drivers/char/drm/drm_sysfs.c

@@ -36,7 +36,7 @@ static int drm_sysfs_suspend(struct device *dev, pm_message_t state)
 	printk(KERN_ERR "%s\n", __FUNCTION__);
 
 	if (drm_dev->driver->suspend)
-		return drm_dev->driver->suspend(drm_dev);
+		return drm_dev->driver->suspend(drm_dev, state);
 
 	return 0;
 }

drivers/char/drm/i915_drv.c

@@ -238,7 +238,7 @@ static void i915_restore_vga(struct drm_device *dev)
 
 }
 
-static int i915_suspend(struct drm_device *dev)
+static int i915_suspend(struct drm_device *dev, pm_message_t state)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int i;
@@ -249,6 +249,9 @@ static int i915_suspend(struct drm_device *dev)
 		return -ENODEV;
 	}
 
+	if (state.event == PM_EVENT_PRETHAW)
+		return 0;
+
 	pci_save_state(dev->pdev);
 	pci_read_config_byte(dev->pdev, LBB, &dev_priv->saveLBB);
 
@@ -363,9 +366,11 @@ static int i915_suspend(struct drm_device *dev)
 
 	i915_save_vga(dev);
 
+	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;
 }