[U-Boot] [PATCH v3 4/4] usb: Change power-on / scanning timeout handling

[Stephen Warren]

On 03/15/2016 07:16 AM, Stefan Roese wrote:
> Hi Stephen,
>
> On 14.03.2016 18:51, Stephen Warren wrote:
>> On 03/14/2016 04:18 AM, Stefan Roese wrote:
>>> This patch changes the USB port scanning procedure and timeout
>>> handling in the following ways:
>>  >..
>>
>> Tested-by: Stephen Warren <swarren at nvidia.com>
>>
>> (including some tests with a 7-port (i.e. 2 nested 4-port) USB hub maxed
>> out with devices).
>
> Thanks for doing those tests on your platform. I'm interested, how
> big the time difference between stock U-Boot and the patched
> version is though. Could you please post those numbers once for
> reference, if its not too much trouble?

It looks like ~17s for v2016.01, and ~6s for u-boot/master from 
yesterday plus these patches, with the following configuration:

Tegra124 (Jetson TK1) # usb tree
USB device tree:
   1  Hub (480 Mb/s, 0mA)
      u-boot EHCI Host Controller

   1  Hub (480 Mb/s, 0mA)
   |  u-boot EHCI Host Controller
   |
   +-2  Hub (480 Mb/s, 100mA)
     |   USB2.0 Hub
     |
     +-3  Hub (480 Mb/s, 100mA)
     | |   USB2.0 Hub
     | |
     | +-6  Mass Storage (480 Mb/s, 2mA)
     | |    Sunplus Innovation Technology. USB to Serial-ATA bridge 
FF980813AF0000000000005FF16BFF
     | |
     | +-7  Mass Storage (480 Mb/s, 100mA)
     | |    Generic    Mass Storage Device 00000000000006
     | |
     | +-8  Human Interface (1.5 Mb/s, 70mA)
     | |    LITEON Technology USB Multimedia Keyboard
     | |
     | +-9  Human Interface (1.5 Mb/s, 100mA)
     |      Microsoft Microsoft IntelliMouse� Explore
     |
     +-4  Vendor specific (480 Mb/s, 250mA)
     |    ASIX Elec. Corp. AX88x72A 000001
     |
     +-5  Mass Storage (480 Mb/s, 200mA)
          SanDisk Extreme AA010114140242512567