[alsa-devel] [PATCH 0/3] ASoC: DPCM can care FE/BE merged format

[Mark Brown]

On Tue, Apr 21, 2015 at 10:51:26AM +0200, Takashi Iwai wrote:

> There are indeed cases where a BE takes incompatible hw configuration,
> which needs be_hw_params_fixup.  But, in general, the FE's hw_params
> is just copied to BE.  That is, we assume here blindly that FE's
> configuration is compatible with BE's.  And, now this assumption isn't
> true in rcar's case, so we face the issue.

Well, it's as much that we're assuming there's rewriting going on which
handles things - in many of these systems everything will be going
through a DSP which rewrites everything on the way.
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