[U-Boot] [PATCH v3 4/4] usb: Change power-on / scanning timeout handling
Stefan Roese
sr at denx.de
Tue Mar 15 17:00:07 CET 2016
Hi Stephen,
On 15.03.2016 16:52, Stephen Warren wrote:
> 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
Thanks.
I'm wondering why your configuration takes that much longer to
scan than mine (x86 platform). My USB configuration is not
that different:
=> time usb start
starting USB...
USB0: USB EHCI 1.00
scanning bus 0 for devices... 9 USB Device(s) found
time: 1.815 seconds
=> usb tree
USB device tree:
1 Hub (480 Mb/s, 0mA)
| u-boot EHCI Host Controller
|
+-2 Hub (480 Mb/s, 0mA)
|
+-3 Hub (480 Mb/s, 100mA)
| |
| +-7 Hub (12 Mb/s, 100mA)
|
+-4 Hub (480 Mb/s, 0mA)
| |
| +-8 Mass Storage (480 Mb/s, 200mA)
| | Kingston DataTraveler 2.0 50E549C688C4BE7189942766
| |
| +-9 Mass Storage (480 Mb/s, 98mA)
| USBest Technology USB Mass Storage Device 09092207fbf0c4
|
+-5 Mass Storage (480 Mb/s, 200mA)
| 6989 Intenso Alu Line EE706F5E
|
+-6 Mass Storage (480 Mb/s, 200mA)
JetFlash Mass Storage Device 3281440601
And I'm down to less than 2 seconds scanning time. Perhaps
worth digging into at some point. But lets get this version
upstreamed first.
Thanks,
Stefan
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