gpu/drm/hisilicon: Convert drm_atomic_helper_suspend/resume()

convert drm_atomic_helper_suspend/resume() to use
drm_mode_config_helper_suspend/resume().

Fixed one sparse warning by making hibmc_drm_interrupt
static.
Signed-off-by: Ajit Negi <ajitn.linux@gmail.com>
Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Reviewed-by: Xinliang Liu <z.liuxinliang@hisilicon.com>
Signed-off-by: Xinliang Liu <z.liuxinliang@hisilicon.com>

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c

@@ -37,7 +37,7 @@ static const struct file_operations hibmc_fops = {
 	.llseek		= no_llseek,
 };
 
-irqreturn_t hibmc_drm_interrupt(int irq, void *arg)
+static irqreturn_t hibmc_drm_interrupt(int irq, void *arg)
 {
 	struct drm_device *dev = (struct drm_device *)arg;
 	struct hibmc_drm_private *priv =
@@ -74,30 +74,16 @@ static int __maybe_unused hibmc_pm_suspend(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
-	struct hibmc_drm_private *priv = drm_dev->dev_private;
-
-	drm_kms_helper_poll_disable(drm_dev);
-	priv->suspend_state = drm_atomic_helper_suspend(drm_dev);
-	if (IS_ERR(priv->suspend_state)) {
-		DRM_ERROR("drm_atomic_helper_suspend failed: %ld\n",
-			  PTR_ERR(priv->suspend_state));
-		drm_kms_helper_poll_enable(drm_dev);
-		return PTR_ERR(priv->suspend_state);
-	}
 
-	return 0;
+	return drm_mode_config_helper_suspend(drm_dev);
 }
 
 static int  __maybe_unused hibmc_pm_resume(struct device *dev)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
 	struct drm_device *drm_dev = pci_get_drvdata(pdev);
-	struct hibmc_drm_private *priv = drm_dev->dev_private;
 
-	drm_atomic_helper_resume(drm_dev, priv->suspend_state);
-	drm_kms_helper_poll_enable(drm_dev);
-
-	return 0;
+	return drm_mode_config_helper_resume(drm_dev);
 }
 
 static const struct dev_pm_ops hibmc_pm_ops = {

drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h

@@ -47,7 +47,6 @@ struct hibmc_drm_private {
 	/* drm */
 	struct drm_device  *dev;
 	bool mode_config_initialized;
-	struct drm_atomic_state *suspend_state;
 
 	/* ttm */
 	struct drm_global_reference mem_global_ref;