From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Sangbeom Kim <sbkim73@samsung.com>
Cc: alsa-devel@alsa-project.org, patches@opensource.wolfsonmicro.com,
'Liam Girdwood' <lrg@ti.com>
Subject: Re: [PATCH] ASoC: Ensure we delay long enough for WM8994 FLL to lock when starting
Date: Mon, 4 Jul 2011 03:07:05 +0100 [thread overview]
Message-ID: <20110704020705.GA4430@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <032b01cc39e7$a5888d00$f099a700$@com>
On Mon, Jul 04, 2011 at 10:13:56AM +0900, Sangbeom Kim wrote:
> Is there any checking method for locking FLL?
> (ex. Checking register bit for FLL lock)
There is an interrupt which I've got a patch to use (it's in need of a
bit more testing so not yet published). You can also poll the status
bits but on a lot of systems that works out as being too expensive due
to I/O costs.
> Just using msleep looks not enough to ensure FLL lock.
Practically speaking it's fine; the FLL lock time is specified
performance characteristic of the device. If we can't lock when we
expect to then the system is in trouble and it's not clear what we can
do about usefully.
next prev parent reply other threads:[~2011-07-27 12:18 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-02 0:35 [PATCH] ASoC: Ensure we delay long enough for WM8994 FLL to lock when starting Mark Brown
2011-07-03 23:59 ` Sangbeom Kim
2011-07-04 0:44 ` Mark Brown
2011-07-04 1:13 ` Sangbeom Kim
2011-07-04 2:07 ` Mark Brown [this message]
2011-07-04 9:44 ` Liam Girdwood
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