[U-Boot] ARM: omap3: Implement dpll5 (HSUSB clk) workaround for OMAP36xx/AM/DM37xx according to errata sprz318e.

[Tom Rini]

On Wed, Aug 14, 2013 at 09:53:16PM -0500, Peter A. Bigot wrote:
> On 07/09/2013 02:43 AM, Naumann Andreas wrote:
> >In chapter 'Advisory 2.1 USB Host Clock Drift Causes USB Spec Non-compliance in Certain Configurations' of the TI Errata it is recommended to use certain div/mult values for the DPLL5 clock setup.
> >So far u-boot used the old 34xx values, so I added the errata recommended values specificly for 36xx init only.
> >Also, the FSEL registers exist no longer, so removed them from init.
> >
> >Tested this on a AM3703 board with 19.2MHz oscillator, which previously couldnt lock the dpll5 (kernel complained). As a consequence the EHCI USB port wasnt usable in U-Boot and kernel. With this patch, kernel panics disappear and USB working fine in u-boot and kernel.
> >
> >Signed-off-by: Andreas Naumann <anaumann at ultratronik.de>
> 
> While this patch works with Linux that has been patched for this
> erratum, it will cause problems with some unpatched versions of
> Linux.

Right.  So Linux also needs to be patched for the erratum.

-- 
Tom
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