A late change to the SMMUv3 architecture ensures that the OAS field
will be monotonically increasing, so we can assume that an unknown OAS
is at least 48-bit and use that, rather than fail the device probe.
Signed-off-by: Will Deacon <will.dea...@arm.com>
---
drivers/iommu/arm-smmu-v3.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 15fb669282b4..a435e706226a 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2528,12 +2528,11 @@ static int arm_smmu_device_probe(struct arm_smmu_device
*smmu)
case IDR5_OAS_44_BIT:
smmu->oas = 44;
break;
+ default:
+ dev_info(smmu->dev,
+ "unknown output address size. Truncating to 48-bit\n");
case IDR5_OAS_48_BIT:
smmu->oas = 48;
- break;
- default:
- dev_err(smmu->dev, "unknown output address size!\n");
- return -ENXIO;
}
/* Set the DMA mask for our table walker */
--
2.1.4
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