linux-kernel - Re: [PATCH] ALSA: Don't cold reset AC97 codecs in some ICH chipsets

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Message-ID: <s5hskn2a7fy.wl%tiwai@suse.de>
Date:	Thu, 29 Jan 2009 08:37:53 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: Don't cold reset AC97 codecs in some ICH chipsets

At Wed, 28 Jan 2009 13:52:59 -0200,
Thadeu Lima de Souza Cascardo wrote:
> 
> On Wed, Jan 28, 2009 at 04:20:12PM +0100, Takashi Iwai wrote:
> > At Wed, 28 Jan 2009 12:40:42 -0200,
> > Thadeu Lima de Souza Cascardo wrote:
> > > 
> > > Check in a quirk list if it should do cold reset when AC97 power saving
> > > is enabled. Some devices do not resume properly when cold reset,
> > > although power saving works OK.
> > > 
> > > Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
> > 
> > Thanks, applied now.
> > 
> > ... and soon I found a build error when CONFIG_SND_AC97_POWERSAVE=n.
> > Fixed, too :)
> 
> 
> Sorry for this one. I've cleaned the modules and built them again with a
> changed config. Must have done something wrong in the build. Thanks for
> the fix.
> 
> Regarding the warning fix in 92aab0a0, it is related to this commit:
> 248c982a, which was proposed by you during our previous discussion, and
> didn't really fix my problem.

I can't find these commit ids.  Which tree are you referring to?


thanks,

Takashi

> I've been watching your tree ever since and this patch has been in your
> master branch since then, perhaps awaiting some conclusion about this
> issue.
> 
> Do you think it solves any problems for other device models? In my case,
> if the cold reset was done, this would simply not work.
> 
> Looking closer to the patch now, I see a point in keeping it, which may
> be the reason you did so. It will make the resume faster in those cases
> the init_bits are different from what the driver though would be there.
> 
> In this case, I think the log message should be more clear about that,
> since it seems to indicate that the commit makes the driver wait for
> more codecs (all codec slots) than before the commit.
> 
> Regards,
> Cascardo.
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