From: Jani Nikula <jani.nikula@linux.intel.com>
To: Paul Bolle <pebolle@tiscali.nl>,
        Andrey Skvortsov <andrej.skvortzov@gmail.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>, David Airlie <airlied@linux.ie>,
        intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
        linux-kernel@vger.kernel.org,
        Ville =?utf-8?B?U3lyasOkbMOk?= <ville.syrjala@linux.intel.com>,
        Matt Roper <matthew.d.roper@intel.com>
Subject: Re: [BISECTED REGRESSION in 3.19-rc1] [drm/i915] WARNING: drivers/gpu/drm/drm_irq.c:1077 drm_wait_one_vblank
In-Reply-To: <1424092249.7482.10.camel@tiscali.nl>
Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
References: <20150131211609.GA3710@yulia-desktop> <1423053134.30076.12.camel@tiscali.nl> <20150204172645.GA2623@crion86> <1424092249.7482.10.camel@tiscali.nl>
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Date: Mon, 23 Feb 2015 14:45:26 +0200
Message-ID: <87egpgre3d.fsf@intel.com>
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On Mon, 16 Feb 2015, Paul Bolle <pebolle@tiscali.nl> wrote:
> I still see this on v3.19. I booted with drm.debug=0x4. The almost 2K
> lines in dmesg containing either "[drm" or this WARNING are pasted
> below. I really know nothing about all this, but I do note that only the
> WARNINGS are preceded by:
>     [drm:intel_calculate_wm] FIFO watermark level: -5
>     [drm:i9xx_update_wm] FIFO watermarks - A: 26, B: 8
>
> But perhaps that's another symptom of the same issue. A bit of staring
> at the code couldn't help me determine that.
>
> Perhaps these debug messages help someone in discovering what might be
> going on here.

Please try v4.0-rc1 or try cherry-picking this on top of v3.19 and
report back:

commit f9b61ff6bce9a44555324b29e593fdffc9a115bc
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Jan 7 13:54:39 2015 +0100

    drm/i915: Push vblank enable/disable past encoder->enable/disable

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center
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