On Fri, Aug 11, 2017 at 09:23:27AM +0200, Daniel Vetter wrote:
> In our snb farm in CI we have plenty of underruns, but not enough
> stolen memory to enable fbc. Which means every time there's an
> underrun the no_fbc_reason swichtes to something that makes
> kms_frontbuffer_tracking fail instead of skip, adding massive amounts
> of additional noise to igt test runs.
>
> Make sure we don't try to disable fbc when it's off already.
>
> Cc: Paulo Zanoni <[email protected]>
> Signed-off-by: Daniel Vetter <[email protected]>
Note this seems to be the real bug that's causing all the spurious noise
on snb CI in the full run. So pretty important to land this fast.
-Daniel
> ---
> drivers/gpu/drm/i915/intel_fbc.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_fbc.c
> b/drivers/gpu/drm/i915/intel_fbc.c
> index 860b8c26d29b..4015b1e716e5 100644
> --- a/drivers/gpu/drm/i915/intel_fbc.c
> +++ b/drivers/gpu/drm/i915/intel_fbc.c
> @@ -1216,7 +1216,7 @@ static void intel_fbc_underrun_work_fn(struct
> work_struct *work)
> mutex_lock(&fbc->lock);
>
> /* Maybe we were scheduled twice. */
> - if (fbc->underrun_detected)
> + if (fbc->underrun_detected || !fbc->enabled)
> goto out;
>
> DRM_DEBUG_KMS("Disabling FBC due to FIFO underrun.\n");
> --
> 2.13.3
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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