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iommu/arm-smmu: allow DOMAIN_ATTR_COHERENT_HTW_DISABLE to be cleared

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Currently there's no way to clear DOMAIN_ATTR_COHERENT_HTW_DISABLE=0 if
you've ever set it.  Fix this.

Change-Id: I10d3bb2f72a94b2b91d4a0500e0e2d9462efcf36
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
This commit is contained in:
Mitchel Humpherys 2014-11-11 17:39:46 -08:00 • committed by David Keitel
parent 487d06ca4d
commit b1dea0183f
1 changed files with 3 additions and 0 deletions
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3
drivers/iommu/arm-smmu.c
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@ -2013,6 +2013,9 @@ static int arm_smmu_domain_set_attr(struct iommu_domain *domain,
if (htw_disable) if (htw_disable)
smmu_domain->attributes |= smmu_domain->attributes |=
(1 << DOMAIN_ATTR_COHERENT_HTW_DISABLE); (1 << DOMAIN_ATTR_COHERENT_HTW_DISABLE);
else
smmu_domain->attributes &=
~(1 << DOMAIN_ATTR_COHERENT_HTW_DISABLE);
return 0; return 0;
} }
default: default: