linux-kernel - Re: [PATCH v3 2/5] ASoC: dwc: Iterate over all channels

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Date:	Mon, 22 Dec 2014 14:08:44 +0000
From:	Andrew Jackson <Andrew.Jackson@....com>
To:	Mark Brown <broonie@...nel.org>
CC:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Liam Girdwood <lgirdwood@...il.com>,
	Rajeev Kumar <rajeevkumar.linux@...il.com>,
	Liviu Dudau <Liviu.Dudau@....com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/5] ASoC: dwc: Iterate over all channels

On 12/22/14 13:53, Mark Brown wrote:
> On Fri, Dec 19, 2014 at 04:18:06PM +0000, Andrew Jackson wrote:
> 
>> 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

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