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

[ Upstream commit 1c0539a6fc8a4a4b77278e35d763073890de96b9 ]

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: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@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 fb15e8b5af32fc0a39b4afb70760706e94796adf..ac3a88197b2fc4473f065afec77633e0ab48e5bd 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -1271,6 +1271,16 @@ static bool is_raven_kicker(struct amdgpu_device *adev)
                return false;
 }
 
+static bool check_if_enlarge_doorbell_range(struct amdgpu_device *adev)
+{
+       if ((adev->asic_type == CHIP_RENOIR) &&
+           (adev->gfx.me_fw_version >= 0x000000a5) &&
+           (adev->gfx.me_feature_version >= 52))
+               return true;
+       else
+               return false;
+}
+
 static void gfx_v9_0_check_if_need_gfxoff(struct amdgpu_device *adev)
 {
        if (gfx_v9_0_should_disable_gfxoff(adev->pdev))
@@ -3619,7 +3629,16 @@ 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);
-               WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
+               /* If GC has entered CGPG, ringing doorbell > first page
+                * doesn't wakeup GC. Enlarge CP_MEC_DOORBELL_RANGE_UPPER to
+                * workaround this issue. And this change has to align with firmware
+                * update.
+                */
+               if (check_if_enlarge_doorbell_range(adev))
+                       WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
+                                       (adev->doorbell.size - 4));
+               else
+                       WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
                                        (adev->doorbell_index.userqueue_end * 2) << 2);
        }