linux-kernel - Re: [PATCH v12 5/7] drm/i915/skl: Ensure pipes with changed wms get added to the state

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Date:   Wed, 21 Sep 2016 12:34:44 +0100
From:   Mike Lothian <mike@...eburn.co.uk>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:     Lyude <cpaul@...hat.com>, intel-gfx@...ts.freedesktop.org,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Radhakrishna Sripada <radhakrishna.sripada@...el.com>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>, stable@...r.kernel.org,
        Daniel Vetter <daniel.vetter@...el.com>
Subject: Re: [PATCH v12 5/7] drm/i915/skl: Ensure pipes with changed wms get
 added to the state

I've raised https://bugs.freedesktop.org/show_bug.cgi?id=97888 I'll
attach the info you requested once I get back to my machine

On 21 September 2016 at 07:56, Maarten Lankhorst
<maarten.lankhorst@...ux.intel.com> wrote:
> Hey,
>
> Op 20-09-16 om 20:45 schreef Mike Lothian:
>> Hi
>>
>> I've bisected back to this commit in the drm-intel-nightly branch
>>
>> 05a76d3d6ad1ee9f9814f88949cc9305fc165460 is the first bad commit
>> commit 05a76d3d6ad1ee9f9814f88949cc9305fc165460
>> Author: Lyude <cpaul@...hat.com>
>> Date:   Wed Aug 17 15:55:57 2016 -0400
>>
>>    drm/i915/skl: Ensure pipes with changed wms get added to the state
>>
>>    If we're enabling a pipe, we'll need to modify the watermarks on all
>>    active planes. Since those planes won't be added to the state on
>>    their own, we need to add them ourselves.
>>
>>    Signed-off-by: Lyude <cpaul@...hat.com>
>>    Reviewed-by: Matt Roper <matthew.d.roper@...el.com>
>>    Cc: stable@...r.kernel.org
>>    Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
>>    Cc: Daniel Vetter <daniel.vetter@...el.com>
>>    Cc: Radhakrishna Sripada <radhakrishna.sripada@...el.com>
>>    Cc: Hans de Goede <hdegoede@...hat.com>
>>    Signed-off-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
>>    Link: http://patchwork.freedesktop.org/patch/msgid/1471463761-26796-6-git-send-email-cpaul@redhat.com
>>
>> The symptoms I'm seeing look like tearing at the top of the screen and
>> it's especially noticeable in Chrome - reverting this commit makes the
>> issue go away
>>
>> Let me know if you'd like me to raise a bug
> Please do so, it's nice to refer to when making a fix for it.
>
> Could you attach the contents of /sys/kernel/debug/dri/0/i915_ddb_info for working and not-working in it?
>
> ~Maarten