From cd37a296a9f890586665bb8974a8b17ee2f17d6d Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Mon, 20 Mar 2017 10:17:57 +0100 Subject: [PATCH] iommu/exynos: Workaround FLPD cache flush issues for SYSMMU v5 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: 740a01eee9ada ("iommu/exynos: Add support for v5 SYSMMU") CC: stable@vger.kernel.org # v4.10+ Signed-off-by: Marek Szyprowski Tested-by: Andrzej Hajda Signed-off-by: Joerg Roedel --- drivers/iommu/exynos-iommu.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 32d43f1994e4..c01bfcdb2383 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -513,7 +513,10 @@ static void sysmmu_tlb_invalidate_flpdcache(struct sysmmu_drvdata *data, if (data->active && 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); -- 2.30.2