linux-kernel - Re: [lkp] [ALSA] ca53fbf3a6: WARNING: CPU: 0 PID: 151 at sound/hda/hdac_i915.c:129 pin2port+0x2a/0x40 [snd_hda

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Message-ID: <s5hfuvt43gk.wl-tiwai@suse.de>
Date:	Mon, 14 Mar 2016 14:02:51 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	"Yang, Libin" <libin.yang@...el.com>
Cc:	kernel test robot <ying.huang@...ux.intel.com>,
	"lkp@...org" <lkp@...org>, LKML <linux-kernel@...r.kernel.org>,
	"Wu, Fengguang" <fengguang.wu@...el.com>,
	"Lin, Mengdong" <mengdong.lin@...el.com>
Subject: Re: [lkp] [ALSA] ca53fbf3a6: WARNING: CPU: 0 PID: 151 at sound/hda/hdac_i915.c:129 pin2port+0x2a/0x40 [snd_hda_core]()

On Mon, 14 Mar 2016 13:02:39 +0100,
Yang, Libin wrote:
> 
> Hi Takashi,
> 
> > -----Original Message-----
> > From: Takashi Iwai [mailto:tiwai@...e.de]
> > Sent: Monday, March 14, 2016 3:23 PM
> > To: kernel test robot
> > Cc: lkp@...org; LKML; Wu, Fengguang; Yang, Libin; Lin, Mengdong
> > Subject: Re: [lkp] [ALSA] ca53fbf3a6: WARNING: CPU: 0 PID: 151 at
> > sound/hda/hdac_i915.c:129 pin2port+0x2a/0x40 [snd_hda_core]()
> > 
> > On Mon, 14 Mar 2016 01:50:45 +0100,
> > kernel test robot wrote:
> > >
> > > FYI, we noticed the below changes on
> > >
> > > https://github.com/0day-ci/linux Takashi-Iwai/ALSA-hda-Add-a-sanity-
> > check-of-pin-port-mapping-on-i915-HDMI-DP/20160310-225740
> > > commit ca53fbf3a609b6831222078af9ddbecbf76fddce ("ALSA: hda -
> > Add a sanity check of pin / port mapping on i915 HDMI/DP")
> > >
> > >
> > > [   14.546058] snd_hda_intel 0000:00:1b.0: bound 0000:00:02.0 (ops
> > i915_audio_component_bind_ops [i915])
> > > [   14.549740] fbcon: inteldrmfb (fb0) is primary device
> > > [   14.553691] ------------[ cut here ]------------
> > > [   14.553707] WARNING: CPU: 0 PID: 151 at
> > sound/hda/hdac_i915.c:129 pin2port+0x2a/0x40 [snd_hda_core]()
> > 
> > Does your tree contain the commit
> >   2f791908a70e95768596f5bb9e6de4f441d7bf13
> >       drm/i915: Fix bogus dig_port_map[] assignment for pre-HSW
> > ?
> > 
> > The commit above should cover it even for HSW.
> > 
> > If it's already included, then it's really a bug, and the warning is
> > exactly for catching such a bug.  The HD-audio driver expects that the
> > valid audio ports are only from port B to port D while i915 driver
> > assigns a different one.  I suspect that the current assumption is too
> > naive and broken for SKL and later in this regard.
> > 
> > Libin, Mengdong, could you check whether the audio port mapping rule
> > is still valid?  At least, a wrong port-A mapping could be reproduced
> > even on a HSW laptop with DP-MST dock when I boot without eDP
> > (e.g. video=eDP-1:d option).
> 
> We checked with HW before, and the mapping should be right.
> What's the problem now? I will check with our HW and gfx team.

One problem I've heard is that port-A is reported from i915 ELD
notifier.  This happens when you disable eDP and use DP-MST on a HSW
machine.  Then port A DDI is also used for the DP-MST, and when it's
plugged, it passes port=0 to the notifier.



Takashi