drm: renesas: shmobile: Use suspend/resume helpers

Replace the custom suspend/resume handling by calls into
drm_mode_config_helper_{suspend,resume}().
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/a52147ca6033e0a59675f37f0326c7404fc5919c.1694767209.git.geert+renesas@glider.be

drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.c

@@ -287,19 +287,6 @@ static void shmob_drm_crtc_stop(struct shmob_drm_crtc *scrtc)
 	scrtc->started = false;
 }
 
-void shmob_drm_crtc_suspend(struct shmob_drm_crtc *scrtc)
-{
-	shmob_drm_crtc_stop(scrtc);
-}
-
-void shmob_drm_crtc_resume(struct shmob_drm_crtc *scrtc)
-{
-	if (scrtc->dpms != DRM_MODE_DPMS_ON)
-		return;
-
-	shmob_drm_crtc_start(scrtc);
-}
-
 static inline struct shmob_drm_crtc *to_shmob_crtc(struct drm_crtc *crtc)
 {
 	return container_of(crtc, struct shmob_drm_crtc, base);

drivers/gpu/drm/renesas/shmobile/shmob_drm_crtc.h

@@ -40,8 +40,6 @@ struct shmob_drm_connector {
 
 int shmob_drm_crtc_create(struct shmob_drm_device *sdev);
 void shmob_drm_crtc_finish_page_flip(struct shmob_drm_crtc *scrtc);
-void shmob_drm_crtc_suspend(struct shmob_drm_crtc *scrtc);
-void shmob_drm_crtc_resume(struct shmob_drm_crtc *scrtc);
 
 int shmob_drm_encoder_create(struct shmob_drm_device *sdev);
 int shmob_drm_connector_create(struct shmob_drm_device *sdev,

drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c

@@ -20,6 +20,7 @@
 #include <drm/drm_drv.h>
 #include <drm/drm_fbdev_generic.h>
 #include <drm/drm_gem_dma_helper.h>
+#include <drm/drm_modeset_helper.h>
 #include <drm/drm_module.h>
 #include <drm/drm_probe_helper.h>
 #include <drm/drm_vblank.h>
@@ -115,22 +116,14 @@ 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;
+	return drm_mode_config_helper_suspend(&sdev->ddev);
 }
 
 static int shmob_drm_pm_resume(struct device *dev)
 {
 	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
 
-	drm_modeset_lock_all(&sdev->ddev);
-	shmob_drm_crtc_resume(&sdev->crtc);
-	drm_modeset_unlock_all(&sdev->ddev);
-
-	drm_kms_helper_poll_enable(&sdev->ddev);
-	return 0;
+	return drm_mode_config_helper_resume(&sdev->ddev);
 }
 
 static int shmob_drm_pm_runtime_suspend(struct device *dev)