[PATCH 2/2] drm: rcar-du: Add Standby Mode to suspend()

[Nguyen An Hoan <na-hoan@jinso.co.jp>]

From: Hoan Nguyen An <na-hoan@jinso.co.jp>

Enter Standby Mode before suspend by drm
We will not need to "Release from Module Standby Mode"
because after resume() is called, this is done.

Signed-off-by: Hoan Nguyen An <na-hoan@jinso.co.jp>
---
 drivers/gpu/drm/rcar-du/rcar_du_drv.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index 32dba13..1ab3f56 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -426,6 +426,20 @@ static struct drm_driver rcar_du_driver = {
 static int rcar_du_pm_suspend(struct device *dev)
 {
 	struct rcar_du_device *rcdu = dev_get_drvdata(dev);
+	int ret;
+	unsigned int i = 0;
+
+	for (i = 0; i < rcdu->num_crtcs; i++)
+	{
+		struct rcar_du_crtc *rcrtc = &rcdu->crtcs[i];
+
+		ret = rcar_du_crtc_standby(rcrtc);
+		if(ret)
+		{
+			dev_err(dev, "failed to enter Standby mode\n");
+			return ret;
+		}
+	}
 
 	return drm_mode_config_helper_suspend(rcdu->ddev);
 }
-- 
2.7.4