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iommu/tegra-smmu: Use non-secure register for flushing 

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@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
alistair/sunxi64-5.5-dsi
Navneet Kumar 2019-10-16 13:50:24 +02:00 committed by Joerg Roedel
parent 4f5cafb5cb
commit 446152d5b6
1 changed files with 1 additions and 1 deletions
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drivers/iommu/tegra-smmu.c
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@ -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)