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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f16e469a534e4d10ad3c6873758ae4a8@BN1PR03MB188.namprd03.prod.outlook.com>
Date:	Tue, 1 Apr 2014 04:19:17 +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 11:38 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 11:48:16AM +0800, Wang Dongsheng-B40534 wrote:
> >
> >
> > > -----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.
> 
> 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/