[PATCH 3/3] drm/tegra: Implement subsystem-level suspend/resume

[Thierry Reding]

From: Thierry Reding <treding at nvidia.com>

Use the drm_atomic_helper_suspend() and drm_atomic_helper_resume()
helpers to implement subsystem-level suspend/resume.

Signed-off-by: Thierry Reding <treding at nvidia.com>
---
 drivers/gpu/drm/tegra/drm.c | 9 +++++++++
 drivers/gpu/drm/tegra/drm.h | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index 767dce20736c..fe5fcb777fb4 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1022,16 +1022,25 @@ static int host1x_drm_remove(struct host1x_device *dev)
 static int host1x_drm_suspend(struct device *dev)
 {
 	struct drm_device *drm = dev_get_drvdata(dev);
+	struct tegra_drm *tegra = drm->dev_private;
 
 	drm_kms_helper_poll_disable(drm);
 
+	tegra->state = drm_atomic_helper_suspend(drm);
+	if (IS_ERR(tegra->state)) {
+		drm_kms_helper_poll_enable(drm);
+		return PTR_ERR(tegra->state);
+	}
+
 	return 0;
 }
 
 static int host1x_drm_resume(struct device *dev)
 {
 	struct drm_device *drm = dev_get_drvdata(dev);
+	struct tegra_drm *tegra = drm->dev_private;
 
+	drm_atomic_helper_resume(drm, tegra->state);
 	drm_kms_helper_poll_enable(drm);
 
 	return 0;
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index dfbc0868dc6f..c31d43150ce1 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -57,6 +57,8 @@ struct tegra_drm {
 		struct work_struct work;
 		struct mutex lock;
 	} commit;
+
+	struct drm_atomic_state *state;
 };
 
 struct tegra_drm_client;
-- 
2.4.5