Commit df5e984c authored Jan 08, 2020 by Tiecheng Zhou Committed by Alex Deucher Jan 14, 2020

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



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>

parent 2d5ef0b4

drivers/gpu/drm/amd/amdgpu/nv.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -726,6 +726,12 @@ static int nv_common_early_init(void *handle)
		AMD_PG_SUPPORT_VCN_DPG \|
		AMD_PG_SUPPORT_JPEG \|
		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:

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