linux-kernel - RE: [PATCH bisect 2/2] ASoC: fsl_sai: Separately enable interrupts for Tx and Rx streams

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Message-ID: <034c8b9a3822441dac07512ae2bbb1e7@BN1PR03MB188.namprd03.prod.outlook.com>
Date:	Tue, 1 Apr 2014 03:48:16 +0000
From:	"Dongsheng.Wang@...escale.com" <Dongsheng.Wang@...escale.com>
To:	"guangyu.chen@...escale.com" <guangyu.chen@...escale.com>
CC:	"broonie@...nel.org" <broonie@...nel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"timur@...i.org" <timur@...i.org>
Subject: RE: [PATCH bisect 2/2] ASoC: fsl_sai: Separately enable interrupts
 for Tx and Rx streams



> -----Original Message-----
> From: Nicolin Chen [mailto:Guangyu.Chen@...escale.com]
> Sent: Tuesday, April 01, 2014 11:14 AM
> To: Wang Dongsheng-B40534
> Cc: broonie@...nel.org; alsa-devel@...a-project.org; Xiubo Li-B47053; linuxppc-
> dev@...ts.ozlabs.org; linux-kernel@...r.kernel.org; timur@...i.org
> Subject: Re: [PATCH bisect 2/2] ASoC: fsl_sai: Separately enable interrupts for
> Tx and Rx streams
> 
> On Tue, Apr 01, 2014 at 11:25:02AM +0800, Wang Dongsheng-B40534 wrote:
> > > Subject: [PATCH bisect 2/2] ASoC: fsl_sai: Separately enable interrupts for
> Tx
> > > and Rx streams
> > >
> > > We only enable one side interrupt for each stream since over/underrun
> > > on the opposite stream would be resulted from what we previously did,
> > > enabling TERE but remaining FRDE disabled, even though the xrun on the
> > > opposite direction will not break the current stream.
> > >
> > > Signed-off-by: Nicolin Chen <Guangyu.Chen@...escale.com>
> > > Acked-by: Xiubo Li <Li.Xiubo@...escale.com>
> > > ---
> > >  sound/soc/fsl/fsl_sai.c | 8 ++++++--
> > >  sound/soc/fsl/fsl_sai.h | 1 +
> > >  2 files changed, 7 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c
> > > index bdfd497..d64c33f 100644
> > > --- a/sound/soc/fsl/fsl_sai.c
> > > +++ b/sound/soc/fsl/fsl_sai.c
> > > @@ -397,4 +397,6 @@ static int fsl_sai_trigger(struct snd_pcm_substream
> > > *substream, int cmd,
> > >
> > >  		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
> > > +				   FSL_SAI_CSR_xIE_MASK, FSL_SAI_FLAGS);
> > > +		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
> > >  				   FSL_SAI_CSR_FRDE, FSL_SAI_CSR_FRDE);
> > >  		break;
> > > @@ -404,4 +406,6 @@ static int fsl_sai_trigger(struct snd_pcm_substream
> > > *substream, int cmd,
> > >  		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
> > >  				   FSL_SAI_CSR_FRDE, 0);
> > > +		regmap_update_bits(sai->regmap, FSL_SAI_xCSR(tx),
> > > +				   FSL_SAI_CSR_xIE_MASK, 0);
> > >
> > >  		if (!(tcsr & FSL_SAI_CSR_FRDE || rcsr & FSL_SAI_CSR_FRDE)) {
> > > @@ -464,6 +468,6 @@ static int fsl_sai_dai_probe(struct snd_soc_dai *cpu_dai)
> > >  	struct fsl_sai *sai = dev_get_drvdata(cpu_dai->dev);
> > >
> > > -	regmap_update_bits(sai->regmap, FSL_SAI_TCSR, 0xffffffff, FSL_SAI_FLAGS);
> > > -	regmap_update_bits(sai->regmap, FSL_SAI_RCSR, 0xffffffff, FSL_SAI_FLAGS);
> > > +	regmap_update_bits(sai->regmap, FSL_SAI_TCSR, 0xffffffff, 0x0);
> > > +	regmap_update_bits(sai->regmap, FSL_SAI_RCSR, 0xffffffff, 0x0);
> >
> > Why are you remove this macro? Don't use magic number.
> 
> It's pretty clear that the so-called magic number is to clear the settings
> in the registers for driver init as what this driver did at the first place
> -- no offense but I don't think you would ask this if you check the git-log
> of the driver.
> 
~FSL_SAI_MASK is better than 0x0. And you also replace 0xffffffff.

Regards,
-Dongsheng

> Thank you,
> Nicolin Chen

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