drm/irq: Add the new api to install irq

Add new api devm_drm_irq_install() to register interrupts,
no need to call drm_irq_uninstall() when the drm module is removed.

Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1606901212-8214-3-git-send-email-tiantao6@hisilicon.com

drivers/gpu/drm/drm_irq.c

@@ -214,6 +214,38 @@ int drm_irq_uninstall(struct drm_device *dev)
 }
 EXPORT_SYMBOL(drm_irq_uninstall);
 
+static void devm_drm_irq_uninstall(void *data)
+{
+	drm_irq_uninstall(data);
+}
+
+/**
+ * devm_drm_irq_install - install IRQ handler
+ * @dev: DRM device
+ * @irq: IRQ number to install the handler for
+ *
+ * devm_drm_irq_install is a  help function of drm_irq_install.
+ *
+ * if the driver uses devm_drm_irq_install, there is no need
+ * to call drm_irq_uninstall when the drm module get unloaded,
+ * as this will done automagically.
+ *
+ * Returns:
+ * Zero on success or a negative error code on failure.
+ */
+int devm_drm_irq_install(struct drm_device *dev, int irq)
+{
+	int ret;
+
+	ret = drm_irq_install(dev, irq);
+	if (ret)
+		return ret;
+
+	return devm_add_action_or_reset(dev->dev,
+					devm_drm_irq_uninstall, dev);
+}
+EXPORT_SYMBOL(devm_drm_irq_install);
+
 #if IS_ENABLED(CONFIG_DRM_LEGACY)
 int drm_legacy_irq_control(struct drm_device *dev, void *data,
 			   struct drm_file *file_priv)

include/drm/drm_irq.h

@@ -28,5 +28,5 @@ struct drm_device;
 
 int drm_irq_install(struct drm_device *dev, int irq);
 int drm_irq_uninstall(struct drm_device *dev);
-
+int devm_drm_irq_install(struct drm_device *dev, int irq);
 #endif