linux-kernel - Re: [PATCH 3/6] ASoC: fsl_ssi: enable AC'97 asymmetric rates

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Message-ID: <20150731055357.GW30895@pengutronix.de>
Date:	Fri, 31 Jul 2015 07:53:57 +0200
From:	Markus Pargmann <mpa@...gutronix.de>
To:	"Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc:	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Timur Tabi <timur@...i.org>,
	Nicolin Chen <nicoleotsuka@...il.com>,
	Xiubo Li <Xiubo.Lee@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH 3/6] ASoC: fsl_ssi: enable AC'97 asymmetric rates

On Fri, Jul 31, 2015 at 07:27:19AM +0200, Markus Pargmann wrote:
> Hi,
> 
> On Thu, Jul 30, 2015 at 04:34:19PM +0200, Maciej S. Szmigiero wrote:
> > AC'97 bus can support asymmetric playback/capture rates
> > so enable them in this case in fsl_ssi driver.
> > 
> > Signed-off-by: Maciej Szmigiero <mail@...iej.szmigiero.name>
> > ---
> >  sound/soc/fsl/fsl_ssi.c |    4 +++-
> >  1 files changed, 3 insertions(+), 1 deletions(-)
> > 
> > diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c
> > index a83b900..7f4f0b9 100644
> > --- a/sound/soc/fsl/fsl_ssi.c
> > +++ b/sound/soc/fsl/fsl_ssi.c
> > @@ -1377,7 +1377,9 @@ static int fsl_ssi_probe(struct platform_device *pdev)
> >  
> >  	/* Are the RX and the TX clocks locked? */
> >  	if (!of_find_property(np, "fsl,ssi-asynchronous", NULL)) {
> > -		ssi_private->cpu_dai_drv.symmetric_rates = 1;
> > +		if (!fsl_ssi_is_ac97(ssi_private))
> > +			ssi_private->cpu_dai_drv.symmetric_rates = 1;
> > +
> 
> Why don't you use the DT property that is parsed here to enable
> asymmetric rates?

Just found the last version of this series. Please use v2 and describe
changes for a new iteration of a series.

There is also a different setup with AC97 which does not use DMA. See
the long comment at the top of the file about how ac97 is already used.

Regards,

Markus

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