linux-kernel - Re: [Intel-gfx] drm/i915: WARN_ON_ONCE(!crtc_clock || cdclk < crtc

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Message-ID: <1476270522.2817.12.camel@linux.intel.com>
Date:   Wed, 12 Oct 2016 14:08:42 +0300
From:   Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
To:     Paul Bolle <pebolle@...cali.nl>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>
Cc:     intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] drm/i915: WARN_ON_ONCE(!crtc_clock || cdclk <
 crtc_clock)

On ke, 2016-10-12 at 11:56 +0200, Paul Bolle wrote:
> On a laptop that tracks the latest stable release (Ie, it now runs
> v4.8.1) I see this WARNING
>     WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock)
> 
> Full trace pasted below. I never saw this WARNING before v4.8. Since
> v4.8 I've had it in all (four, actually) boots.
> 
> What am I expected to do about this WARNING?
> 

Bisecting the offending commit between v4.8 and v4.8.1 would be a good
start.

Regards, Joonas
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation