[PATCH v3] drm/amdgpu: fix the doorbell missing when in CGPG issue for renoir.

[Yifan Zhang]

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 at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 03acc777adf7..a35f1d041a85 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -3675,7 +3675,18 @@ 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,
+		/* In renoir, 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 ((adev->asic_type == CHIP_RENOIR) &&
+		    (adev->gfx.me_fw_version >= 0x000000a5) &&
+		    (adev->gfx.me_feature_version >= 52))
+			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);
 	}
 
-- 
2.25.1