linux-kernel - Re: [alsa-devel] [PATCH] ASoC: wm8962: Correct the bit offset to enable mono speaker output

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Message-ID: <20140812215742.GE17528@sirena.org.uk>
Date:	Tue, 12 Aug 2014 22:57:42 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	Peter Chan <peter.chan@...escale.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"tiwai@...e.de" <tiwai@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...nsource.wolfsonmicro.com" 
	<patches@...nsource.wolfsonmicro.com>,
	"shengjiu.wang@...escale.com" <shengjiu.wang@...escale.com>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	Nicolin Chen <nicoleotsuka@...il.com>,
	"guangyu.chen@...escale.com" <guangyu.chen@...escale.com>,
	"rf@...nsource.wolfsonmicro.com" <rf@...nsource.wolfsonmicro.com>
Subject: Re: [alsa-devel] [PATCH] ASoC: wm8962: Correct the bit offset to
 enable mono speaker output

On Tue, Aug 12, 2014 at 09:24:16AM +0100, Charles Keepax wrote:
> On Mon, Aug 11, 2014 at 02:19:49PM +0100, Charles Keepax wrote:

> > From the wording of "tie both outputs together" in the datasheet
> > I would assume that means both should be fed the same audio? Was
> > this done? I will try to give the hardware guys here a shout and
> > see if I can get some clarification on mono mode on this device.

> I have had a word with the hardware team here and both channels
> do need to be enabled but audio should only be fed to the left
> channel. So the driver definitely needs updated for the mono
> case, but I am unclear as to what is causing your poor audio
> quality issue.

Overdriving the speaker perhaps?

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