gpu: nvgpu: bypass smmu for VPR memory access

SMMU translation should be bypassed for VPR
accesses via GPU.
clear sgt dma address to bypass smmu for VPR.

Bug 1215470

Change-Id: I22df41a9afc447e2502055b7907cc1848a770f26
Signed-off-by: Krishna Reddy <vdumpa@nvidia.com>
Reviewed-on: http://git-master/r/696509
(cherry picked from commit a699f55941fa22e90d41a53798956a542b212659)
Reviewed-on: http://git-master/r/707889

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c b/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
index dfbc1ae0..28b7ff7b 100644
--- a/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
+++ b/drivers/gpu/nvgpu/gk20a/platform_gk20a_tegra.c
@@ -121,7 +121,8 @@ static int gk20a_tegra_secure_alloc(struct platform_device *pdev,
         }
         page = phys_to_page(iova);
         sg_set_page(sgt->sgl, page, size, 0);
-        sg_dma_address(sgt->sgl) = iova;
+        /* This bypasses SMMU for VPR during gmmu_map. */
+        sg_dma_address(sgt->sgl) = 0;
 
         desc->sgt = sgt;