linux-kernel - Re: 3.19 on Nokia n900: audio quality awful

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Message-ID: <20150106231341.GA18468@amd>
Date:	Wed, 7 Jan 2015 00:13:41 +0100
From:	Pavel Machek <pavel@....cz>
To:	Felipe Balbi <balbi@...com>
Cc:	Aaro Koskinen <aaro.koskinen@....fi>, pali.rohar@...il.com,
	sre@...ian.org, sre@...g0.de,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
	ivo.g.dimitrov.75@...il.com
Subject: Re: 3.19 on Nokia n900: audio quality awful

On Tue 2015-01-06 17:04:15, Felipe Balbi wrote:
> Hi,
> 
> On Tue, Jan 06, 2015 at 11:56:14PM +0100, Pavel Machek wrote:
> > > > But I'm mounting it from userspace (using builtin initramfs inside
> > > > zImage), with a poll loop that waits for a device to appear. Maybe if you
> > > > do it from kernel you need to use root wait/delay etc. options?
> > > 
> > > yeah, rootwait should do it.
> > 
> > No, rootwait does not solve it. Try it. Tested many times. (And yes,
> > you need to actually fool the rear cover sensor or close the phone.)
> 
> yeah, just put a magnet or, if you have spare back covers, cut one so
> that you "close" it, but still allow you to put the thing on a
> development jig.

Actually, it should be enough to kill a line from dts somewhere, no
need to hack hardware for this.

> Also, if why doesn't rootwait work ? You never have a new mmc node or is
> the mmc node changing names ?

IIRC node and name are ok, but the mount just fails. As I don't have
"development jig", I lack serial console and this kind of debugging is
not easy.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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