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.y...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c
index faaa6aa2faaf..a36e191cf086 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);
}
/**
--
2.17.1
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