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iommu/arm-smmu: Treat unknown OAS as 48-bit 

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.deacon@arm.com>
This commit is contained in:
Will Deacon 2015-08-03 10:35:40 +01:00
parent bae2c2d421
commit 85430968ae
1 changed files with 4 additions and 4 deletions
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8
drivers/iommu/arm-smmu-v3.c
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@ -2550,12 +2550,12 @@ 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");
/* Fallthrough */
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 */