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

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[ Upstream commit 64b22a0da1 ]

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: 25fdd5933e ("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>
This commit is contained in:
Abhinav Kumar 2022-05-18 15:34:07 -07:00 committed by Greg Kroah-Hartman
parent 02ef47c929
commit 97dd217191
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
View file

@ -1075,7 +1075,9 @@ 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);