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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>
This commit is contained in:
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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5
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
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@ -1545,8 +1545,11 @@ static void gmc_v9_0_init_golden_registers(struct amdgpu_device *adev)
*/
void gmc_v9_0_restore_registers(struct amdgpu_device *adev)
{
if (adev->asic_type == CHIP_RAVEN)
if (adev->asic_type == CHIP_RAVEN) {
WREG32_SOC15(DCE, 0, mmDCHUBBUB_SDPIF_MMIO_CNTRL_0, adev->gmc.sdpif_register);
WARN_ON(adev->gmc.sdpif_register !=
RREG32_SOC15(DCE, 0, mmDCHUBBUB_SDPIF_MMIO_CNTRL_0));
}
}
/**