From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Jassi Brar <jassisinghbrar@gmail.com>
Cc: Seungwhan Youn <sw.youn@samsung.com>,
alsa-devel@alsa-project.org, Liam Girdwood <lrg@slimlogic.co.uk>,
Seungwhan Youn <claude.youn@gmail.com>
Subject: Re: [PATCH 4/7] ASoC: Automatically calculate clock ratio for WM8580
Date: Tue, 17 Aug 2010 10:46:05 +0100 [thread overview]
Message-ID: <20100817094605.GC18622@rakim.wolfsonmicro.main> (raw)
In-Reply-To: <AANLkTindYfm3vh_OgF-0tt_MS+Uxii2s7Dw=Kk487RTd@mail.gmail.com>
On Tue, Aug 17, 2010 at 08:14:43AM +0900, Jassi Brar wrote:
> I guess most quality conscious products can afford to attach a dedicated
> OSC to a good CODEC. A CODEC already specifies the clocks it support
> and usually comes with 'preferred' input clocks. So, just having a specified
> rating accurate enough OSC can take care of quality. On the other hand
> the clock sources on CPU side are not particularly accurate for audio-clock
> generation. Or so have I seen so far.
Right, this shouldn't be an issue with the change I proposed - the
clocks are still rooted from the CODEC and its clock generation
facilities would still be used, it's just that they get routed
differently.
The issue with using most CPU clocks isn't really the dedicated
oscillator so much as the ability to generate non-integer divisions of
whatever input clock is available. If this can't be done then it can be
hard to generate the full range of common audio frequencies.
next prev parent reply other threads:[~2010-08-17 9:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-13 19:33 [PATCH 0/7] WM8580 updates Mark Brown
2010-08-13 19:35 ` [PATCH 1/7] ASoC: Add a bit of resource unwinding in the S3C IISv4 driver Mark Brown
2010-08-13 19:35 ` [PATCH 2/7] ASoC: Convert WM8580 hw_params to use snd_soc_update_bits() Mark Brown
2010-08-13 19:35 ` [PATCH 3/7] ASoC: Remove unused rate selection bitmasks from WM8580 Mark Brown
2010-08-13 19:35 ` [PATCH 4/7] ASoC: Automatically calculate clock ratio for WM8580 Mark Brown
2010-08-15 9:00 ` Seungwhan Youn
2010-08-15 11:09 ` Mark Brown
2010-08-16 4:36 ` Jassi Brar
2010-08-16 10:20 ` Mark Brown
2010-08-16 12:51 ` Jassi Brar
2010-08-16 15:19 ` Mark Brown
2010-08-16 23:14 ` Jassi Brar
2010-08-17 9:46 ` Mark Brown [this message]
2010-08-31 6:46 ` Jassi Brar
2010-08-31 10:42 ` Mark Brown
2010-08-16 4:16 ` Seungwhan Youn
2010-08-16 12:21 ` Mark Brown
2010-08-16 12:47 ` Jassi Brar
2010-08-13 19:35 ` [PATCH 5/7] ASoC: Implement BCLK rate selection " Mark Brown
2010-08-13 19:35 ` [PATCH 6/7] ASoC: Fix inverted WM8580 capture mute control Mark Brown
2010-08-15 4:50 ` Seungwhan Youn
2010-08-15 6:20 ` Seungwhan Youn
2010-08-13 19:35 ` [PATCH 7/7] ASoC: Automatically manage WM8580 DAC OSR Mark Brown
2010-08-14 4:09 ` [PATCH 0/7] WM8580 updates Jassi Brar
2010-08-15 9:21 ` Seungwhan Youn
2010-08-15 11:10 ` Mark Brown
2010-08-16 9:44 ` Seungwhan Youn
2010-08-16 14:49 ` Mark Brown
2010-08-19 11:37 ` Seungwhan Youn
2010-08-14 10:45 ` Liam Girdwood
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20100817094605.GC18622@rakim.wolfsonmicro.main \
--to=broonie@opensource.wolfsonmicro.com \
--cc=alsa-devel@alsa-project.org \
--cc=claude.youn@gmail.com \
--cc=jassisinghbrar@gmail.com \
--cc=lrg@slimlogic.co.uk \
--cc=sw.youn@samsung.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.