amdgpu/gmc_v9: Warn if SDPIF_MMIO_CNTRL_0 is not set

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With IOMMU enabled, if SDPIF_MMIO_CNTRL_0 is not set
appropriately the system hangs without any trace
during S3.

To ease debug and to ensure that the failure, if any,
was caused by a race conditions that disabled write access to
SDPIF_MMIO_CNTRL_0 register, warn the user about it.

Signed-off-by: Shirish S <shirish.s@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Shirish S 2020-09-14 10:11:23 +05:30 • committed by Alex Deucher

parent 92e005936e

commit 0eaa801242

1 changed files with 4 additions and 1 deletions

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drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

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