video: tegra: host: Use correct device for clamps

Currently the CV cluster clamp functions use the client device
aperture while accessing the clamp registers thereby causing an
invalid register access to the device aperture.

This change fixes the issue by making the CV cluster clamp functions
fetch the parent of the client device.

Change-Id: I77e0f5f60dca2494cc316366273b8b7a11daefc9
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1572426
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/video/tegra/host/nvhost_cv_pm.c b/drivers/video/tegra/host/nvhost_cv_pm.c
index 78f56fa02..b61b7ab9e 100644
--- a/drivers/video/tegra/host/nvhost_cv_pm.c
+++ b/drivers/video/tegra/host/nvhost_cv_pm.c
@@ -32,6 +32,9 @@ static DEFINE_MUTEX(cv_cluster_lock);
 /* Must be called BEFORE CV modules power on (reset asserted) */
 void cv_cluster_unclamp(struct platform_device *pdev)
 {
+        if (pdev->dev.parent && pdev->dev.parent != &platform_bus)
+                pdev = to_platform_device(pdev->dev.parent);
+
         mutex_lock(&cv_cluster_lock);
 
         /* Unclamp */
@@ -45,6 +48,9 @@ void cv_cluster_unclamp(struct platform_device *pdev)
 /* Must be called AFTER CV modules power down */
 void cv_cluster_clamp(struct platform_device *pdev)
 {
+        if (pdev->dev.parent && pdev->dev.parent != &platform_bus)
+                pdev = to_platform_device(pdev->dev.parent);
+
         mutex_lock(&cv_cluster_lock);
 
         /* Clamp */