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 <shiris...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index d0645ad3446e..fc2d88dbe828 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -1546,8 +1546,11 @@ 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);
+ }
}
/**
--
2.17.1
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