iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5

[ Upstream commit cd37a29 ] For some unknown reasons, in some cases, FLPD cache invalidation doesn't work properly with SYSMMU v5 controllers found in Exynos5433 SoCs. This can be observed by a firmware crash during initialization phase of MFC video decoder available in the mentioned SoCs when IOMMU support is enabled. To workaround this issue perform a full TLB/FLPD invalidation in case of replacing any first level page descriptors in case of SYSMMU v5. Fixes: 740a01e ("iommu/exynos: Add support for v5 SYSMMU") CC: [email protected] # v4.10+ Signed-off-by: Marek Szyprowski <[email protected]> Tested-by: Andrzej Hajda <[email protected]> Signed-off-by: Joerg Roedel <[email protected]> Signed-off-by: Sasha Levin <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
linux4sam · Dec 25, 2017 · 7171aa2 · 7171aa2
1 parent 0f0ac21
commit 7171aa2
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
@@ -543,7 +543,10 @@ static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data,
 	if (is_sysmmu_active(data) && data->version >= MAKE_MMU_VER(3, 3)) {
 		clk_enable(data->clk_master);
 		if (sysmmu_block(data)) {
-			__sysmmu_tlb_invalidate_entry(data, iova, 1);
+			if (data->version >= MAKE_MMU_VER(5, 0))
+				__sysmmu_tlb_invalidate(data);
+			else
+				__sysmmu_tlb_invalidate_entry(data, iova, 1);
 			sysmmu_unblock(data);
 		}
 		clk_disable(data->clk_master);