[U-Boot] [PATCH] usb: increase delay after port reset

[Ilya Yanok]

Hi Mike,

On 10.11.2011 05:09, Mike Frysinger wrote:
> On Wednesday 09 November 2011 19:03:58 Ilya Yanok wrote:
>> In our setup (OMAP3 EHCI host, keyboard, mouse mass storage and BT
>> dongle devices connected via several hubs) keyboard fails to initialize
>> during the bus scan (stalled endpoint while get_descriptor/64) and after
>> that keyboard is unusable (even in Linux) until power off/on.
>>
>> Increasing the delay after port reset from 200ms to 260ms solves this
>> problem.
> 
> ugh.  this doesn't sound like the right way to fix things.  looks like Linux 
> has added a dynamic polling state that automatically deals with broken 
> devices.  look at its hub_port_debounce.  seems like we should implement 
> something like that instead of delaying longer and longer and making the 
> situation needlessly worse for most systems.

Thanks for the pointer. Unfortunately I don't have time to look into
this deeper and we will go with a workaround for now.

Maybe we will return to this later.

Regards, Ilya.