[PATCH 5/5] drm/amd/sriov skip vcn powergating and dec_ring_test

[Jack Zhang]

1.Skip decode_ring test in VF, because VCN in SRIOV does not
support direct register read/write.

2.Skip powergating configuration in hw fini because
VCN3.0 SRIOV doesn't support powergating.

Signed-off-by: Jack Zhang <Jack.Zhang1 at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c |  4 ++++
 drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c   | 17 +++++++++++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
index 15ff30c53e24..92a55e40bc48 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
@@ -421,6 +421,10 @@ int amdgpu_vcn_dec_ring_test_ring(struct amdgpu_ring *ring)
 	unsigned i;
 	int r;
 
+	/* VCN in SRIOV does not support direct register read/write */
+	if (amdgpu_sriov_vf(adev))
+		return 0;
+
 	WREG32(adev->vcn.inst[ring->me].external.scratch9, 0xCAFEDEAD);
 	r = amdgpu_ring_alloc(ring, 3);
 	if (r)
diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
index 0a0ca10bf55b..8e5de9ed64f3 100644
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
@@ -354,10 +354,13 @@ static int vcn_v3_0_hw_fini(void *handle)
 
 		ring = &adev->vcn.inst[i].ring_dec;
 
-		if ((adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) ||
+		if (amdgpu_sriov_vf(adev)) {
+			/* for SRIOV, VM does not control PG state */
+		} else if ((adev->pg_flags & AMD_PG_SUPPORT_VCN_DPG) ||
 			(adev->vcn.cur_state != AMD_PG_STATE_GATE &&
-			RREG32_SOC15(VCN, i, mmUVD_STATUS)))
+			RREG32_SOC15(VCN, i, mmUVD_STATUS))) {
 			vcn_v3_0_set_powergating_state(adev, AMD_PG_STATE_GATE);
+		}
 
 		ring->sched.ready = false;
 
@@ -1208,6 +1211,7 @@ static int vcn_v3_0_start(struct amdgpu_device *adev)
 	return 0;
 }
 
+
 static int vcn_v3_0_start_sriov(struct amdgpu_device *adev)
 {
 	int i, j;
@@ -1861,6 +1865,15 @@ static int vcn_v3_0_set_powergating_state(void *handle,
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 	int ret;
 
+	/* for SRIOV, guest should not control VCN Power-gating
+	 * MMSCH FW should control Power-gating and clock-gating
+	 * guest should avoid touching CGC and PG
+	 */
+	if (amdgpu_sriov_vf(adev)) {
+		adev->vcn.cur_state = AMD_PG_STATE_UNGATE;
+		return 0;
+	}
+
 	if(state == adev->vcn.cur_state)
 		return 0;
 
-- 
2.17.1