[Freedreno] [PATCH] drm/msm/dpu: handle pm_runtime_get_sync() errors in bind path

[Abhinav Kumar]

If there are errors while trying to enable the pm in the
bind path, it will lead to unclocked access of hw revision
register thereby crashing the device.

This will not address why the pm_runtime_get_sync() fails
but at the very least we should be able to prevent the
crash by handling the error and bailing out earlier.

Signed-off-by: Abhinav Kumar <quic_abhinavk at quicinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 2b9d931474e0..2fd1f5b70a06 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1089,7 +1089,11 @@ static int dpu_kms_hw_init(struct msm_kms *kms)
 
 	dpu_kms_parse_data_bus_icc_path(dpu_kms);
 
-	pm_runtime_get_sync(&dpu_kms->pdev->dev);
+	rc = pm_runtime_get_sync(&dpu_kms->pdev->dev);
+	if (rc < 0) {
+		pm_runtime_put_autosuspend(&dpu_kms->pdev->dev);
+		goto error;
+	}
 
 	dpu_kms->core_rev = readl_relaxed(dpu_kms->mmio + 0x0);
 
-- 
2.35.1