linux-kernel - Re: SM501: core (mfd) driver

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Date:	Wed, 13 Dec 2006 20:04:06 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ben Dooks <ben-fbdev@...ff.org>
Cc:	linux-kernel@...r.kernel.org,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: SM501: core (mfd) driver

On Wed, 2006-12-13 at 17:51 +0000, Ben Dooks wrote:
> > > +
> > > +	writel(mode, sm->regs + SM501_POWER_MODE_CONTROL);
> > > +
> > > +	dev_dbg(sm->dev, "gate %08lx, clock %08lx, mode %08lx\n",
> > > +		gate, clock, mode);
> > > +
> > > +	msleep(16);
> > 
> > you're missing a PCI posting flush here
> > (if you don't know what this is please ask)
> 
> Is this a read from an device register to cause the PCI writes
> to happen?

yup

>  Would reading SM501_POWER_MODE_CONTROL be ok, or does
> it require a different register?

any register is ok, you can read the same one just fine.


greetings,
   Arjan van de Ven
-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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