linux-kernel - Re: [PATCH v3 5/8] ARM: mediatek: add smp bringup code for MT6580

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Message-ID: <1438912785.1900.33.camel@mtkswgap22>
Date:	Fri, 7 Aug 2015 09:59:45 +0800
From:	Scott Shu <scott.shu@...iatek.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-mediatek@...ts.infradead.org>, <wsd_upstream@...iatek.com>,
	<loda.chou@...iatek.com>, <jades.shih@...iatek.com>,
	<Mars.Cheng@...iatek.com>, <scott.shu@...il.com>
Subject: Re: [PATCH v3 5/8] ARM: mediatek: add smp bringup code for MT6580

On Thu, 2015-08-06 at 08:19 +0200, Sascha Hauer wrote:
> On Wed, Aug 05, 2015 at 06:47:03PM +0200, Matthias Brugger wrote:
> > On Tuesday, August 04, 2015 09:54:21 PM Scott Shu wrote:
> > > Add support for cpu enable-method "mediatek,mt6580-smp" for booting
> > > secondary CPUs on MT6580.
> > > 
> > > Signed-off-by: Scott Shu <scott.shu@...iatek.com>
> > > ---
> > >  arch/arm/mach-mediatek/platsmp.c |  137
> > > ++++++++++++++++++++++++++++++++++++++ 1 file changed, 137 insertions(+)
> > > +
> > > +static void __init mt6580_smp_prepare_cpus(unsigned int max_cpus)
> > > +{
> > > +	static void __iomem *infracfg_ao_base;
> > > +
> > > +	infracfg_ao_base = ioremap(MT6580_INFRACFG_AO, 0x1000);
> > > +	if (!infracfg_ao_base) {
> > > +		pr_err("%s: Unable to map I/O memory\n", __func__);
> > > +		return;
> > > +	}
> > > +
> > > +	/* Enable bootrom power down mode */
> > > +	writel_relaxed(readl(infracfg_ao_base + 0x804) | SW_ROM_PD,
> > > +		       infracfg_ao_base + 0x804);
> > 
> > Please use a define for the offset.
> > I prefer to not cascade reads and writes but to use a temporary variable. But 
> > if this is fine with the kernel coding style (I doubt, but I'm not sure) then 
> > this is fine.
> 
> For what it's worth I also prefer
> 
> 	val = readl(infracfg_ao_base + 0x804);
> 	val |= SW_ROM_PD:
> 	writel_relaxed(val, infracfg_ao_base + 0x804);
> 
> I find this better readable. I don't think though that there's common
> agreement that this style is better.
> 
> Sascha
> 
Fixed in next version. Thanks.

Scott

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