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drm/amdgpu/sriov: workaround on rev_id for Navi12 under sriov 

[ Upstream commit df5e984c8bd414561c320d6cbbb66d53abf4c7e2 ]

guest vm gets 0xffffffff when reading RCC_DEV0_EPF0_STRAP0,
as a consequence, the rev_id and external_rev_id are wrong.

workaround it by hardcoding the rev_id to 0, which is the default value.

v2. add comment in the code

Signed-off-by: Tiecheng Zhou <Tiecheng.Zhou@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>
This commit is contained in:
Tiecheng Zhou 2020-01-08 13:44:29 +08:00 committed by Greg Kroah-Hartman
parent 750a95d637
commit 9f3a2e147f
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/amd/amdgpu/nv.c
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@ -660,6 +660,12 @@ static int nv_common_early_init(void *handle)
adev->pg_flags = AMD_PG_SUPPORT_VCN |
AMD_PG_SUPPORT_VCN_DPG |
AMD_PG_SUPPORT_ATHUB;
/* guest vm gets 0xffffffff when reading RCC_DEV0_EPF0_STRAP0,
* as a consequence, the rev_id and external_rev_id are wrong.
* workaround it by hardcoding rev_id to 0 (default value).
*/
if (amdgpu_sriov_vf(adev))
adev->rev_id = 0;
adev->external_rev_id = adev->rev_id + 0xa;
break;
default: