[PATCH RESEND 1/2] drm/msm: call drm_atomic_helper_suspend() and drm_atomic_helper_resume()

[Daniel Mack <daniel@zonque.org>]

To make suspend and resume work on msm8916 platforms, call into the generic
helpers and preserve the state across suspends.

Signed-off-by: Daniel Mack <daniel@zonque.org>
---
I've sent these two small patches twice already in May, but I haven't
gotten any feedback, not sure why.

We're using these on a number of prototypes and they seem to do work
just fine.

 drivers/gpu/drm/msm/msm_drv.c | 9 +++++++++
 drivers/gpu/drm/msm/msm_drv.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 0a3ea3034e39..cdbe9249bff2 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -907,16 +907,25 @@ static struct drm_driver msm_driver = {
 static int msm_pm_suspend(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct msm_drm_private *priv = ddev->dev_private;
 
 	drm_kms_helper_poll_disable(ddev);
 
+	priv->pm_state = drm_atomic_helper_suspend(ddev);
+	if (IS_ERR(priv->pm_state)) {
+		drm_kms_helper_poll_enable(ddev);
+		return PTR_ERR(priv->pm_state);
+	}
+
 	return 0;
 }
 
 static int msm_pm_resume(struct device *dev)
 {
 	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct msm_drm_private *priv = ddev->dev_private;
 
+	drm_atomic_helper_resume(ddev, priv->pm_state);
 	drm_kms_helper_poll_enable(ddev);
 
 	return 0;
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index 0a653dd2e618..459d06a1ab9f 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -155,6 +155,7 @@ struct msm_drm_private {
 	struct shrinker shrinker;
 
 	struct msm_vblank_ctrl vblank_ctrl;
+	struct drm_atomic_state *pm_state;
 };
 
 struct msm_format {
-- 
2.14.3

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