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drm/amdgpu: return IH ring drain finished if ring is empty

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Sometimes IH do not setup ring wptr overflow flag after wptr exceed
rptr. As a workaround, if IH rptr equals to wptr, ring is empty,
return true to indicate IH ring checkpoint is processed, IH ring drain
is finished.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Philip Yang
2021-04-17 22:37:21 -04:00
committed by Alex Deucher
parent 4999e398e2
commit 11dd55d174
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
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@@ -175,7 +175,9 @@ static bool amdgpu_ih_has_checkpoint_processed(struct amdgpu_device *adev,
cur_rptr += ih->ptr_mask + 1;
*prev_rptr = cur_rptr;
return cur_rptr >= checkpoint_wptr;
/* check ring is empty to workaround missing wptr overflow flag */
return cur_rptr >= checkpoint_wptr ||
(cur_rptr & ih->ptr_mask) == amdgpu_ih_get_wptr(adev, ih);
}
/**