linux-kernel - Re: [PATCH v2 26/28] drm/i2c: tda998x: code optimization

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Message-ID: <20140112094533.GP15937@n2100.arm.linux.org.uk>
Date:	Sun, 12 Jan 2014 09:45:33 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	dri-devel@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
	Dave Airlie <airlied@...il.com>, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 26/28] drm/i2c: tda998x: code optimization

On Sun, Jan 12, 2014 at 09:22:01AM +0100, Jean-Francois Moine wrote:
> On Sat, 11 Jan 2014 18:55:09 +0000
> Russell King - ARM Linux <linux@....linux.org.uk> wrote:
> 
> > On Thu, Jan 09, 2014 at 12:07:25PM +0100, Jean-Francois Moine wrote:
> > > This patch reduces the number of I2C exchanges by setting many bits in
> > > one write and removing a useless write.
> > > 
> > > Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
> > > ---
> > >  drivers/gpu/drm/i2c/tda998x_drv.c   | 10 ++++------
> > >  1 file changed, 4 insertions(+), 6 deletions(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
> > > index 6b4f6d2..d3b3f3a 100644
> > > --- a/drivers/gpu/drm/i2c/tda998x_drv.c
> > > +++ b/drivers/gpu/drm/i2c/tda998x_drv.c
> > > @@ -751,10 +751,10 @@ tda998x_configure_audio(struct tda998x_priv *priv,
> > >  	}
> > >  
> > >  	reg_write(priv, REG_AIP_CLKSEL, clksel_aip);
> > > -	reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_LAYOUT);
> > > +	reg_clear(priv, REG_AIP_CNTRL_0, AIP_CNTRL_0_LAYOUT |
> > 
> > This patch clearly hasn't even been build tested, so I doubt there's
> > much point reviewing this or the following patches.  From a quick scan
> > of the following patches, this never got fixed so the following patches
> > can't have been build tested either.
> 
> I don't see what can be the problem with this patch. It does not change
> anything in the logic. About testing, it is applied to my Cubox kernel
> for more than 4 months and everything works correctly.
> 
> I will move the following comment a bit upwards. Maybe the code will be
> clearer.

You're replacing ");" with "|" here, which is not legal C.  Parenthesis
must be balanced and statements must be terminated.

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