From: "Dongsheng.Wang@freescale.com" <Dongsheng.Wang@freescale.com>
To: "guangyu.chen@freescale.com" <guangyu.chen@freescale.com>
CC: "broonie@kernel.org" <broonie@kernel.org>,
        "alsa-devel@alsa-project.org" <alsa-devel@alsa-project.org>,
        "Li.Xiubo@freescale.com" <Li.Xiubo@freescale.com>,
        "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "timur@tabi.org" <timur@tabi.org>
Subject: RE: [PATCH bisect 2/2] ASoC: fsl_sai: Separately enable interrupts
 for Tx and Rx streams
Thread-Topic: [PATCH bisect 2/2] ASoC: fsl_sai: Separately enable interrupts
 for Tx and Rx streams
Thread-Index: AQHPTVjbRLXYSOiWaEaYn6jUdqX/4pr8GHGA///9wwCAAAgzIP///nSAgAAKafA=
Date: Tue, 1 Apr 2014 04:19:17 +0000
Message-ID: <f16e469a534e4d10ad3c6873758ae4a8@BN1PR03MB188.namprd03.prod.outlook.com>
References: <1396322227-482-1-git-send-email-Guangyu.Chen@freescale.com>
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> -----Original Message-----
> From: Nicolin Chen [mailto:Guangyu.Chen@freescale.com]
> Sent: Tuesday, April 01, 2014 11:38 AM
> To: Wang Dongsheng-B40534
> Cc: broonie@kernel.org; alsa-devel@alsa-project.org; Xiubo Li-B47053; linuxppc-
> dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; timur@tabi.org
> Subject: Re: [PATCH bisect 2/2] ASoC: fsl_sai: Separately enable interrupts for
> Tx and Rx streams
> 
> On Tue, Apr 01, 2014 at 11:48:16AM +0800, Wang Dongsheng-B40534 wrote:
> >
> >
> > > -----Original Message-----
> > > From: Nicolin Chen [mailto:Guangyu.Chen@freescale.com]
> > > Sent: Tuesday, April 01, 2014 11:14 AM
> > > To: Wang Dongsheng-B40534
> > > Cc: broonie@kernel.org; alsa-devel@alsa-project.org; Xiubo Li-B47053;
> linuxppc-
> > > dev@lists.ozlabs.org; linux-kernel@vger.kernel.org; timur@tabi.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@freescale.com>
> > > > > Acked-by: Xiubo Li <Li.Xiubo@freescale.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.
> 
> I would later send a patch to reset SAI for a true init instead of these lines
> but not within this patch as it's focusing on the interrupts enabling.
> 
> So please don't grasp the mask here. Just let me continue.
> 

:), fine.

Regards,
-Dongsheng

> Thank you,
> Nicolin Chen

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