[alsa-devel] [PATCH 1/5] ASoC: Blackfin: fix bug - kernel willcrash when record and play in bf527-ezkit
Cliff.Cai at analog.com
Mon Mar 9 11:58:19 CET 2009
This patch should be named : change the configuring way for sport,
Because I found that the previous way is not reliable sometimes.
Application like "tone" ,will call starup() twice before entering
hw_params() to configure SPORT.
in this case SPORT won't be configured at all.
>From: Mark Brown [mailto:broonie at sirena.org.uk]
>Sent: Friday, March 06, 2009 8:02 PM
>To: Bryan Wu
>Cc: Cliff Cai; alsa-devel at alsa-project.org;
>linux-kernel at vger.kernel.org
>Subject: Re: [alsa-devel] [PATCH 1/5] ASoC: Blackfin: fix bug
>- kernel willcrash when record and play in bf527-ezkit
>On Fri, Mar 06, 2009 at 03:53:26PM +0800, Bryan Wu wrote:
>> From: Cliff Cai <cliff.cai at analog.com>
>> set constraint only if the value is not 0, change the
>> for sport
>Hrm. As far as I can tell the actual effect of this patch is
>to not do any of the per-format configuration for the sport if
>the sport has been configured once already - as far as I can
>tell nothing ever resets your 'configured' variable and this
>is the only place that the data format is taken into account.
>Won't this mean that if a second data format is played the
>audio will be mishandled since the hardware will not have been
>configured for the new audio format?
>If it's really not possible to reconfigure the hardware (I'm
>assuming that this is what the actual crash is?) I would
>expect to see code added which remembers the format that has
>been configured and then adds a constraint in the startup()
>function enforcing that.
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