[U-Boot] [PATCH v2 0/4] usb: Reduce USB scanning time

[Hans de Goede]

Hi,

On 11-03-16 18:53, Stephen Warren wrote:
> On 03/11/2016 07:55 AM, Stefan Roese wrote:
>>
>> My current x86 platform (Bay Trail, not in mainline yet) has a quite
>> complex USB infrastructure with many USB hubs. Here the USB scan takes
>> an incredible huge amount of time:
>>
>> starting USB...
>> USB0:   USB EHCI 1.00
>> scanning bus 0 for devices... 9 USB Device(s) found
>>
>> time: 28.415 seconds
>>
>> This is of course not acceptable on platforms, where USB needs to get
>> scanned at every bootup. As this increases the bootup time of this
>> device by nearly 30 seconds!
>>
>> This patch series greatly reduces the USB scanning time. This is done
>> by multiple means:
>>
>> - Remove or reduce delays and timeouts
>> - Remove a 2nd reset of the USB hubs
>> - Change USB port timeout handling and introduce quasi parallel USB
>>    port scanning
>>
>> As a result, the USB scanning time is greatly reduced:
>>
>> starting USB...
>> USB0:   USB EHCI 1.00
>> scanning bus 0 for devices... 9 USB Device(s) found
>>
>> time: 4.606 seconds
>>
>> As you can see, the time is reduced from 28.4 to 4.6 seconds!
>>
>> Please find more details to the changes in the patch description.
>>
>> Testing and comments welcome!
>
> The series,
> Tested-by: Stephen Warren <swarren at nvidia.com>
> (same set of tests as last time)

And the entire series looks good to me (note not tested only reviewed) :

Acked-by: Hans de Goede <hdegoede at redhat.com>

Thank you for working on this.

Regards,

Hans