On 12/22/14 13:53, Mark Brown wrote:

On Fri, Dec 19, 2014 at 04:18:06PM +0000, Andrew Jackson wrote:

quoted

The Designware core can be configured with up to four stereo channels.
Each stereo channel is individually configured so, when the driver's
hw_params call is made, each requested stereo channel has to be
programmed.

This is quite unclear to someone who doesn't know the hardware, is this
a bug fix or a new feature?  It looks like it's a fix...

It is a fix.  In the Designware core, each stereo channel is configured
individually.  So, when hw_params is called to configure N channels, 
N/2 stereo channels need to be configured in the core.  The existing
code doesn't do this and will only configure the highest numbered 
channel.

    Andrew