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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: 740a01eee9 ("iommu/exynos: Add support for v5 SYSMMU")
CC: stable@vger.kernel.org # v4.10+
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Marek Szyprowski 2017-03-20 10:17:57 +01:00 committed by Joerg Roedel
parent 7d2aa6b814
commit cd37a296a9
1 changed files with 4 additions and 1 deletions
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5
drivers/iommu/exynos-iommu.c
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@ -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);