[PATCH 5/7] drm/amdgpu/vce1: Check if VRAM address is lower than GART.

["Timur Kristóf" <timur.kristof@gmail.com>]

Previously, I had assumed this was not possible
so it was OK to not handle it, but now we got a report
from a user who has a board that is configured this way.

When the VCPU BO is already located in a low 32-bit address
in VRAM (eg. when VRAM is mapped to the low address space),
don't do the workaround.

Fixes: 66a80158aa2a ("amdgpu/vce: use amdgpu_gtt_mgr_alloc_entries")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/vce_v1_0.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c b/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
index 35caef5a8102e..b7b6096c1a1fd 100644
--- a/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
@@ -538,6 +538,9 @@ static int vce_v1_0_ensure_vcpu_bo_32bit_addr(struct amdgpu_device *adev)
 	u64 vce_gart_start_offs;
 	int r;
 
+	if (adev->gmc.vram_start < adev->gmc.gart_start)
+		return amdgpu_bo_gpu_offset(adev->vce.vcpu_bo) <= max_vcpu_bo_addr ? 0 : -EINVAL;
+
 	r = amdgpu_gtt_mgr_alloc_entries(&adev->mman.gtt_mgr,
 					 &adev->vce.gart_node, num_pages, 0,
 					 DRM_MM_INSERT_LOW);
-- 
2.53.0