drm/amdgpu: Check num_gfx_rings for gfx v9_0 rb setup.

No need to set up rb when no gfx rings.

Signed-off-by: Candice Li <candice.li@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 7f187558220e9a3fdaa80f0c7834b6dcb139cea3..1d6d3a852a0b3d158f340b48503cb06c8c546f12 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -2597,7 +2597,8 @@ static void gfx_v9_0_constants_init(struct amdgpu_device *adev)
 
        gfx_v9_0_tiling_mode_table_init(adev);
 
-       gfx_v9_0_setup_rb(adev);
+       if (adev->gfx.num_gfx_rings)
+               gfx_v9_0_setup_rb(adev);
        gfx_v9_0_get_cu_info(adev, &adev->gfx.cu_info);
        adev->gfx.config.db_debug2 = RREG32_SOC15(GC, 0, mmDB_DEBUG2);