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

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Message-ID: <20140401031409.GA26925@MrMyself>
Date:	Tue, 1 Apr 2014 11:14:10 +0800
From:	Nicolin Chen <Guangyu.Chen@...escale.com>
To:	Wang Dongsheng-B40534 <Dongsheng.Wang@...escale.com>
CC:	"broonie@...nel.org" <broonie@...nel.org>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Xiubo Li-B47053 <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

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.

Thank you,
Nicolin Chen

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