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SubjectRe: [PATCH AUTOSEL for 4.9 36/56] drm/i915: Fix the level 0 max_wm hack on VLV/CHV

Cc: Greg

On Wed, 15 Nov 2017, Ville Syrjälä <> wrote:
> On Wed, Nov 15, 2017 at 04:44:54PM +0000, wrote:
>> On Wed, Nov 15, 2017 at 01:08:05PM +0200, Ville Syrjälä wrote:
>> >On Wed, Nov 15, 2017 at 02:45:43AM +0000, wrote:
>> >> From: Ville Syrjälä <>
>> >>
>> >> [ Upstream commit 1be4d3793d5a93daddcd9be657c429b38ad750a3 ]
>> >>
>> >> The watermark should never exceed the FIFO size, so we need to
>> >> check against the current FIFO size instead of the theoretical
>> >> maximum when we clamp the level 0 watermark.
>> >>
>> >> Signed-off-by: Ville Syrjälä <>
>> >> Link:
>> >> Reviewed-by: Maarten Lankhorst <>
>> >> Signed-off-by: Sasha Levin <>
>> >
>> >Why are these patches being proposed for stable? They're not straight up
>> >fixes for known issues, and there's always a chance that something will
>> >break. Who is doing the qa on this?
>> Hi Ville,
>> They were selected automatically as part of a new process we're trying
>> out. If you disagree with the selection I'd be happy to drop it.
> How does that automatic process decide that a patch should be backported?
> drm and i915 are very fast moving targets so unintended side effects from
> backported patches is a real possibility. So I would recommend against
> backporting anything that isn't fixing a real issue affecting users. We
> do try to add the cc:stable to such patches.


First, I think an automatic backport process is against the stable
kernel rules (e.g. "It must fix a real bug that bothers people").

Second, we can't and won't take any responsibility for backports we
didn't indicate with Cc: stable, a Fixes: tag, or a specific backport

If you think there's a commit that should be backported and is known to
fix a user visible issue (as per the stable rules!), please check with
us first.


Jani Nikula, Intel Open Source Technology Center

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