drm/amdgpu/gfx9: fix the doorbell missing when in CGPG issue.

If GC has entered CGPG, ringing doorbell > first page doesn't wakeup GC.
Enlarge CP_MEC_DOORBELL_RANGE_UPPER to workaround this issue.

Signed-off-by: Yifan Zhang <yifan1.zhang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 516467e..c09225d 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3673,8 +3673,12 @@ static int gfx_v9_0_kiq_init_register(struct amdgpu_ring *ring)
        if (ring->use_doorbell) {
                WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_LOWER,
                                        (adev->doorbell_index.kiq * 2) << 2);
+               /* If GC has entered CGPG, ringing doorbell > first page doesn't
+                * wakeup GC. Enlarge CP_MEC_DOORBELL_RANGE_UPPER to workaround
+                * this issue.
+                */
                WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
-                                       (adev->doorbell_index.userqueue_end * 2) << 2);
+                                       (adev->doorbell.size - 4));
        }
 
        WREG32_SOC15_RLC(GC, 0, mmCP_HQD_PQ_DOORBELL_CONTROL,