iommu/tegra: smmu: Remove unnecessary PTC/TLB flush all
smmu_flush_regs() does TLB/PTC flush all for a second level page
table. This isn't necessay at all since each pte entry has been
already maintained by address in the above flush_ptc_and_tlb().
Change-Id: I45d6decefcd49ef6f02043ead1a46701ee6ed19e
Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Reviewed-on: http://git-master/r/166477
Reviewed-by: Mrutyunjay Sawant <msawant@nvidia.com>
Tested-by: Mrutyunjay Sawant <msawant@nvidia.com>
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index af2b973..2eb6cd0 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -714,10 +714,8 @@
*pte = _PTE_VACANT(iova);
FLUSH_CPU_DCACHE(pte, page, sizeof(*pte));
flush_ptc_and_tlb(as->smmu, as, iova, pte, page, 0);
- if (!--(*count)) {
+ if (!--(*count))
free_ptbl(as, iova);
- smmu_flush_regs(as->smmu, 0);
- }
return 0;
}