linux-kernel - Re: [patch] snd-pcsp: silent misleading warning

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Date:	Sun, 18 May 2008 09:44:38 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Stas Sergeev <stsp@...et.ru>
Cc:	Roberto Oppedisano <roberto.oppedisano@...racom.it>,
	LKML <linux-kernel@...r.kernel.org>, alsa-devel@...a-project.org
Subject: Re: [patch] snd-pcsp: silent misleading warning

At Sat, 17 May 2008 19:50:42 +0400,
Stas Sergeev wrote:
> 
> Hello.
> 
> Roberto Oppedisano wrote:
> > I noticed that when I run
> > aplay -D plughw:2,0 /usr/share/sounds/KDE_Logout.wav
> >  I get a flood of:
> > [  417.338143] PCSP: playback_ptr inconsistent (4642 4661 18645)
> It turns out that the buffer size you
> get, is not evenly devided by period size.
> 18645 % 4661 = 1.
> That (wrongly) triggers the warning.
> This may very well be an alsa bug, or
> may not, but the code in the driver is
> handling that properly, so there is no
> need for such a verbose warning.

The right fix would be to add a hw_constraint to align the buffer
size.  The simplest way is to add the following in PCM open callback.

	snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);


Takashi
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