From: Liam Girdwood <lrg@ti.com>
To: Timur Tabi <timur@freescale.com>
Cc: alsa-devel@alsa-project.org, broonie@opensource.wolfsonmicro.com
Subject: Re: [PATCH 3/3] ASoC: improve asynchronous mode support in the fsl_ssi driver
Date: Wed, 14 Sep 2011 13:37:21 +0100 [thread overview]
Message-ID: <1316003841.3229.16.camel@odin> (raw)
In-Reply-To: <1315936777-27994-3-git-send-email-timur@freescale.com>
On Tue, 2011-09-13 at 12:59 -0500, Timur Tabi wrote:
> The Freescale SSI audio controller supports "synchronous" and "asynchronous"
> modes. In synchronous mode, playback and capture use the same input clock,
> so sample rates must be the same during simultaneous playback and capture.
> Unfortunately, the code which supports asynchronous mode is just broken in
> various ways. In particular, it was constraining sample sizes as well as
> the sample rate.
>
> The fix also allows us to simplify the code by eliminating the 'asynchronous',
> 'playback', and 'capture' variables that were used to keep track of playback
> and capture streams.
>
> Unfortunately, it turns out that simulataneous playback and record does not
> actually work on the only platform that supports asynchronous mode: the
> Freescale P1022DS reference board. If a second stream is started, the SSI
> grinds to halt for both streams. This is true even if the P1022 is configured
> for synchronous mode, so it's likely a hardware problem that needs to be
> worked around.
>
> Signed-off-by: Timur Tabi <timur@freescale.com>
Acked-by: Liam Girdwood <lrg@ti.com>
next prev parent reply other threads:[~2011-09-14 12:37 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-13 17:59 [PATCH 1/3] ASoC: support sample sizes properly in the WM8776 codec driver Timur Tabi
2011-09-13 17:59 ` [PATCH 2/3] ASoC: support all possible sample rates in the WM8776 driver Timur Tabi
2011-09-14 12:36 ` Liam Girdwood
2011-09-15 10:24 ` Mark Brown
2011-09-15 15:08 ` Timur Tabi
2011-09-15 22:38 ` Mark Brown
2011-09-15 23:06 ` Tabi Timur-B04825
2011-09-15 23:49 ` Mark Brown
2011-09-16 13:48 ` Timur Tabi
2011-09-17 13:04 ` Mark Brown
2011-09-13 17:59 ` [PATCH 3/3] ASoC: improve asynchronous mode support in the fsl_ssi driver Timur Tabi
2011-09-14 12:37 ` Liam Girdwood [this message]
2011-09-15 23:06 ` Mark Brown
2011-09-15 23:49 ` Mark Brown
2011-09-14 12:35 ` [PATCH 1/3] ASoC: support sample sizes properly in the WM8776 codec driver Liam Girdwood
2011-09-14 21:51 ` Timur Tabi
2011-09-15 10:26 ` Mark Brown
2011-09-15 11:28 ` Tabi Timur-B04825
2011-09-15 13:21 ` Mark Brown
2011-09-15 15:16 ` Timur Tabi
2011-09-15 23:38 ` Mark Brown
2011-09-16 9:07 ` Mark Brown
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