From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 17 Nov 2016 20:40:22 +0000 (-0500)
Subject: drm/amdgpu: put gtt at 0 in the internal address space
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9dc5a91e4d1cc7accd776f20198df48255de516f;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

drm/amdgpu: put gtt at 0 in the internal address space

There still seem to be some blocks that make accesses
in the lower part of the address space.  This works around
this.

Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 00bf0ea0c6d0..cc01b3f27a1f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -602,7 +602,7 @@ void amdgpu_gtt_location(struct amdgpu_device *adev, struct amdgpu_mc *mc)
 			dev_warn(adev->dev, "limiting GTT\n");
 			mc->gtt_size = size_bf;
 		}
-		mc->gtt_start = (mc->vram_start & ~mc->gtt_base_align) - mc->gtt_size;
+		mc->gtt_start = 0;
 	} else {
 		if (mc->gtt_size > size_af) {
 			dev_warn(adev->dev, "limiting GTT\n");