linux-kernel - Re: [PATCH] ARM: OMAP4: clock: Initialize USB DPLL

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Message-ID: <alpine.DEB.2.02.1310090704180.30199@utopia.booyaka.com>
Date:	Wed, 9 Oct 2013 07:05:16 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Roger Quadros <rogerq@...com>
cc:	tony@...mide.com, balbi@...com, rnayak@...com, t-kristo@...com,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: OMAP4: clock: Initialize USB DPLL

Hi Roger,

On Thu, 21 Mar 2013, Roger Quadros wrote:

> +Paul
> 
> On 03/21/2013 03:48 PM, Roger Quadros wrote:
> > If the bootloader doesn't configure USB DPLL (e.g. in u-boot,
> > disable CONFIG_USB_EHCI_OMAP), then we get all sorts of problems
> > like
> > - division by zero errors at boot [1]
> > - USB DPLL fails to enter locked state
> > - USB EHCI Host is non functional
> > - Device can't enter OFF mode
> > 
> > Initializing the USB DPLL fixes all these issues.

Looks like I may have lost track of this - do we still need this one?

Also:

> > diff --git a/arch/arm/mach-omap2/cclock44xx_data.c b/arch/arm/mach-omap2/cclock44xx_data.c
> > index bfc46c1..6127bb9 100644
> > --- a/arch/arm/mach-omap2/cclock44xx_data.c
> > +++ b/arch/arm/mach-omap2/cclock44xx_data.c
> > @@ -53,6 +53,12 @@
> >   */
> >  #define OMAP4_DPLL_ABE_DEFFREQ				98304000
> >  
> > +/*
> > + * OMAP4450 TRM Rev X, section "3.6.3.9.5 DPLL_USB Preferred Settings"

4450?


- Paul
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