[PATCH 5.19 608/717] drm/admgpu: Skip CG/PG on SOC21 under SRIOV VF

Greg Kroah-Hartman
2022-10-22T10:04:22Z

From: Yifan Zha <Yifan.Zha@amd.com>

[ Upstream commit 828418259254863e0af5805bd712284e2bd88e3b ]

[Why]
There is no CG(Clock Gating)/PG(Power Gating) requirement on SRIOV VF.
For multi VF, VF should not enable any CG/PG features.
For one VF, PF will program CG/PG related registers.

[How]
Do not set any cg/pg flag bit at early init under sriov.

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Yifan Zha <Yifan.Zha@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/soc21.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/soc21.c b/drivers/gpu/drm/amd/amdgpu/soc21.c
index 8d5c452a9100..6d3bfb0f0346 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc21.c
+++ b/drivers/gpu/drm/amd/amdgpu/soc21.c
@@ -551,6 +551,10 @@ static int soc21_common_early_init(void *handle)
AMD_PG_SUPPORT_JPEG |
AMD_PG_SUPPORT_ATHUB |
AMD_PG_SUPPORT_MMHUB;
+ if (amdgpu_sriov_vf(adev)) {
+ adev->cg_flags = 0;
+ adev->pg_flags = 0;
+ }
adev->external_rev_id = adev->rev_id + 0x1; // TODO: need update
break;
case IP_VERSION(11, 0, 2):
--
2.35.1