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path: root/drivers/gpu/drm/amd/amdgpu/si_ih.c
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Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/si_ih.c')
-rw-r--r--drivers/gpu/drm/amd/amdgpu/si_ih.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/si_ih.c b/drivers/gpu/drm/amd/amdgpu/si_ih.c
index 9a24f17a5..cada9f300 100644
--- a/drivers/gpu/drm/amd/amdgpu/si_ih.c
+++ b/drivers/gpu/drm/amd/amdgpu/si_ih.c
@@ -119,6 +119,12 @@ static u32 si_ih_get_wptr(struct amdgpu_device *adev,
tmp = RREG32(IH_RB_CNTL);
tmp |= IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK;
WREG32(IH_RB_CNTL, tmp);
+
+ /* Unset the CLEAR_OVERFLOW bit immediately so new overflows
+ * can be detected.
+ */
+ tmp &= ~IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK;
+ WREG32(IH_RB_CNTL, tmp);
}
return (wptr & ih->ptr_mask);
}