From ac4f40871c82d38d9f275312ccdf9c6ff454e7a9 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 BugLink: http://bugs.launchpad.net/bugs/1677589 commit cd37a296a9f890586665bb8974a8b17ee2f17d6d upstream. 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") Signed-off-by: Marek Szyprowski Tested-by: Andrzej Hajda Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman Signed-off-by: Tim Gardner --- 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 7c81c793150c..318cc878d0ca 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -510,7 +510,10 @@ 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); -- 2.39.5