drm/amdgpu: Set doorbell range for gfx ring

If there are 2 gfx rings, the doorbell lower range of second ring
will override the first ring.

Signed-off-by: Jinzhou.Su <Jinzhou.Su@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -6357,8 +6357,11 @@ static int gfx_v10_0_gfx_mqd_init(struct amdgpu_ring *ring)
 				    DOORBELL_EN, 0);
 	mqd->cp_rb_doorbell_control = tmp;
 
-	/* set doorbell range */
-	gfx_v10_0_cp_gfx_set_doorbell(adev, ring);
+	/*if there are 2 gfx rings, set the lower doorbell range of the first ring,
+	 *otherwise the range of the second ring will override the first ring */
+	if (ring->doorbell_index == adev->doorbell_index.gfx_ring0 << 1)
+		gfx_v10_0_cp_gfx_set_doorbell(adev, ring);
+
 	/* reset read and write pointers, similar to CP_RB0_WPTR/_RPTR */
 	ring->wptr = 0;
 	mqd->cp_gfx_hqd_rptr = RREG32_SOC15(GC, 0, mmCP_GFX_HQD_RPTR);