linux-kernel - Re: [BISECTED REGRESSION in 3.19-rc1] [drm/i915] WARNING: drivers/gpu/drm/drm_irq.c:1077 drm_wait_one

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Message-ID: <20150223195242.GA3871@crion86>
Date:	Mon, 23 Feb 2015 22:52:42 +0300
From:	Andrey Skvortsov <andrej.skvortzov@...il.com>
To:	Jani Nikula <jani.nikula@...ux.intel.com>
Cc:	Paul Bolle <pebolle@...cali.nl>,
	Daniel Vetter <daniel.vetter@...el.com>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	Matt Roper <matthew.d.roper@...el.com>
Subject: Re: [BISECTED REGRESSION in 3.19-rc1] [drm/i915] WARNING:
 drivers/gpu/drm/drm_irq.c:1077 drm_wait_one_vblank

On Mon, Feb 23, 2015 at 02:45:26PM +0200, Jani Nikula wrote:
> On Mon, 16 Feb 2015, Paul Bolle <pebolle@...cali.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@...ll.ch>
> Date:   Wed Jan 7 13:54:39 2015 +0100
> 
>     drm/i915: Push vblank enable/disable past encoder->enable/disable
> 
Hi, 

Can't test this on v4.0-rc1, because I get black screen unfortunatelly. 
But cherry-picking on v3.19 fixes all warnings drm_wait_one_vblank. 

-- 
Best regards,
Andrey Skvortsov

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