[PATCH] drm/amdgpu/sriov: workaround on rev_id for Navi12 under sriov

[Tiecheng Zhou]

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.

Signed-off-by: Tiecheng Zhou <Tiecheng.Zhou at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/nv.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c b/drivers/gpu/drm/amd/amdgpu/nv.c
index b0229543e887..63d54604ace6 100644
--- a/drivers/gpu/drm/amd/amdgpu/nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/nv.c
@@ -726,6 +726,8 @@ static int nv_common_early_init(void *handle)
 			AMD_PG_SUPPORT_VCN_DPG |
 			AMD_PG_SUPPORT_JPEG |
 			AMD_PG_SUPPORT_ATHUB;
+		if (amdgpu_sriov_vf(adev))
+			adev->rev_id = 0;
 		adev->external_rev_id = adev->rev_id + 0xa;
 		break;
 	default:
-- 
2.17.1