From: Philip Yang Date: Sun, 18 Apr 2021 02:37:21 +0000 (-0400) Subject: drm/amdgpu: return IH ring drain finished if ring is empty X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=11dd55d1743881c7c8f62171066292fc034e1c3c;p=linux.git drm/amdgpu: return IH ring drain finished if ring is empty 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 Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c index faaa6aa2faaf2..a36e191cf0860 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c @@ -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); } /**