From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Brown <broonie@kernel.org>
Subject: Re: [alsa-devel] [PATCH] ASoC: dpcm: don't do hw_param when BE has
 done	hw_param
Date: Sat, 11 Jan 2014 12:08:26 +0000
Message-ID: <20140111120826.GS29039@sirena.org.uk>
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To: Takashi Iwai <tiwai@suse.de>
Cc: Liam Girdwood <liam.r.girdwood@linux.intel.com>, "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, Nenghua Cao <nhcao@marvell.com>
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On Sat, Jan 11, 2014 at 10:35:33AM +0100, Takashi Iwai wrote:

> But, the point is that basically we already know that something is
> wrong at the point BE2 setting up an incompatible hw_params; then it
> should be notified properly to FE1, or the incompatible change must be
> handled as an error.  This is the missing piece in the current
> implementation.  The skip of redundant BE hw_params call can be
> implemented as an optimization in this compatibility check, too.

Only in the case where they actually are incompatible though - if
there's DSP in place which can do suitable mixing it's not an issue.
At the minute the core is relying on the drivers handling any limits
just like with the CODECs.

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