[PATCH 1/3] iommu/tegra-smmu: Use non-secure register for flushing
Thierry Reding
thierry.reding at gmail.com
Wed Oct 16 11:50:24 UTC 2019
From: Navneet Kumar <navneetk at nvidia.com>
Use PTB_ASID instead of SMMU_CONFIG to flush smmu.
PTB_ASID can be accessed from non-secure mode, SMMU_CONFIG cannot be.
Using SMMU_CONFIG could pose a problem when kernel doesn't have secure
mode access enabled from boot.
Signed-off-by: Navneet Kumar <navneetk at nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx at gmail.com>
Tested-by: Dmitry Osipenko <digetx at gmail.com>
Signed-off-by: Thierry Reding <treding at nvidia.com>
---
drivers/iommu/tegra-smmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 99f85fb5a704..03e667480ec6 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -240,7 +240,7 @@ static inline void smmu_flush_tlb_group(struct tegra_smmu *smmu,
static inline void smmu_flush(struct tegra_smmu *smmu)
{
- smmu_readl(smmu, SMMU_CONFIG);
+ smmu_readl(smmu, SMMU_PTB_ASID);
}
static int tegra_smmu_alloc_asid(struct tegra_smmu *smmu, unsigned int *idp)
--
2.23.0
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