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path: root/drivers/gpu/drm/amd/amdgpu/cz_ih.c
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Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/cz_ih.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/cz_ih.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/cz_ih.c b/drivers/gpu/drm/amd/amdgpu/cz_ih.c
index b8c47e0cf..c19681492 100644
--- a/drivers/gpu/drm/amd/amdgpu/cz_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/cz_ih.c
@@ -216,6 +216,11 @@ static u32 cz_ih_get_wptr(struct amdgpu_device *adev,
tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
WREG32(mmIH_RB_CNTL, tmp);
+ /* Unset the CLEAR_OVERFLOW bit immediately so new overflows
+ * can be detected.
+ */
+ tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0);
+ WREG32(mmIH_RB_CNTL, tmp);
out:
return (wptr & ih->ptr_mask);