drm/amdgpu: change amdgpu_ttm_set_active_vram_size

Instead of setting the active VRAM size directly provide a the info if
we can use the buffer functions or not.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Chunming zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
index 69568cd..f48ea0d 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c
@@ -310,7 +310,7 @@ static void cik_sdma_gfx_stop(struct amdgpu_device *adev)
 
 	if ((adev->mman.buffer_funcs_ring == sdma0) ||
 	    (adev->mman.buffer_funcs_ring == sdma1))
-		amdgpu_ttm_set_active_vram_size(adev, adev->gmc.visible_vram_size);
+			amdgpu_ttm_set_buffer_funcs_status(adev, false);
 
 	for (i = 0; i < adev->sdma.num_instances; i++) {
 		rb_cntl = RREG32(mmSDMA0_GFX_RB_CNTL + sdma_offsets[i]);
@@ -510,7 +510,7 @@ static int cik_sdma_gfx_resume(struct amdgpu_device *adev)
 		}
 
 		if (adev->mman.buffer_funcs_ring == ring)
-			amdgpu_ttm_set_active_vram_size(adev, adev->gmc.real_vram_size);
+			amdgpu_ttm_set_buffer_funcs_status(adev, true);
 	}
 
 	return 0;