drm/msm/dpu: handle pm_runtime_get_sync() errors in bind path

[ Upstream commit 64b22a0da12adb571c01edd671ee43634ebd7e41 ]

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.

changes in v2:
	- use pm_runtime_resume_and_get() instead of
	  pm_runtime_get_sync()

Fixes: 25fdd5933e4c ("drm/msm: Add SDM845 DPU support")
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/486721/
Link: https://lore.kernel.org/r/20220518223407.26147-1-quic_abhinavk@quicinc.com
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index 33ce672..2870b0f 100644 (file)
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1001,7 +1001,9 @@ 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_resume_and_get(&dpu_kms->pdev->dev);
+       if (rc < 0)
+               goto error;
 
        dpu_kms->core_rev = readl_relaxed(dpu_kms->mmio + 0x0);