[U-Boot] [PATCH] usb: ehci-omap: Don't softreset USB High-speed Host (UHH) Module

[Dan Murphy]

On 07/22/2013 03:52 AM, Marek Vasut wrote:
> Dear Roger Quadros,
>
>> Fixes NFS root problems with Beagle (3530 ES1.0) when used with
>> external USB-ethernet adapter and "USB start" command used within
>> u-boot.
>>
>> Soft resetting the UHH module causes instability issues on
>> all OMAPs so we just avoid it.
>>
>> See OMAP36xx Errata
>>   i571: USB host EHCI may stall when entering smart-standby mode
>>   i660: USBHOST Configured In Smart-Idle Can Lead To a Deadlock
>>
>> On OMAP4/5, soft-resetting the UHH module can put it into
>> Smart-Idle mode and lead to a deadlock.
>>
>> On OMAP3 this doesn't seem to be the case but still instabilities
>> are observed on beagle (3530 ES1.0) if soft-reset is used.
>>  e.g. NFS root failures with Linux kernel.
>>
>> Signed-off-by: Roger Quadros <rogerq at ti.com>
> Acked-by: Marek Vasut <marex at denx.de>
>
> Now it all depends on Tom, but this would be a last-second save ;-)
>
> Best regards,
> Marek Vasut
Tested-by: Dan Murphy <dmurphy at ti.com>

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Dan Murphy