linux-kernel - Re: [PATCH v1] ppc44x:PHY fixup for USB on canyonlands board

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Date:	Wed, 24 Nov 2010 08:10:21 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Stefan Roese <sr@...x.de>
Cc:	linuxppc-dev@...ts.ozlabs.org, linuxppc-dev@...abs.org,
	Rupjyoti Sarmah <rsarmah@...c.com>, rsarmah@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] ppc44x:PHY fixup for USB on canyonlands board


> > +	setbits8(&bcsr[7], BCSR_USB_EN);
> > +	udelay(100000);
> > +
> > +	clrbits8(&bcsr[7], BCSR_USB_EN);
> > +	udelay(100000);
> 
> Thats a total bootup delay of 200ms. Is this really needed?

In addition, so large delays should use msleep() if possible (depends
how early we are here).

Cheers,
Ben,

> And I suggest to add a few comments to the code explaining why exactly you are 
> setting/clearing the bits in the BCSR and the GPIO registers.

Seconded,

Cheers,
Ben.


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