FUSB200 xhci issue

[Oleksij Rempel]

Am 28.07.2013 22:41, schrieb Christian Lamparter:
> On Sunday, July 28, 2013 04:28:25 PM Oleksij Rempel wrote:
>> Am 28.07.2013 14:12, schrieb Oleksij Rempel:
>>> Am 28.07.2013 13:38, schrieb Christian Lamparter:
>>>
>>>>>>
>>>>>> Anyway, I tried the -next branch.
>>>>>>
>>>>>> commit dbbb809d592dde0b3c9ecb97b3b387ff8e40e799
>>>>>> Author: Oleksij Rempel <linux at rempel-privat.de>
>>>>>> Date:   Wed Jul 24 10:26:18 2013 +0200
>>>>>>
>>>>>>        k2_fw_usb_api: workaround for EP4 bug.
>>>>>>
>>>>>> but still, the device won't show up after autosuspend.
>>>>>
>>>>> Hm... firmware probably didn't rebooted before suspend. Did interface
>>>>> was up, before autosuspend? If no, you need latest wireles-testing -
>>>>> there are patches to handle this issue. Or just make "ifconfig wlan1 up"
>>>>>     before  rmmod.
>>>> Oh, I it was on the latest wireless-testing. (And the "ath9k_htc" module
>>>> had the patch "ath9k_htc: reboot firmwware if it was loaded").
>>>>
>>>> Furthermore, I did the same test with one of the ehci-only ports
>>>> and it worked. Both, devices (one had a AR7015, the other a AR9271)
>>>> came back after autosuspend there.
>>>
>>> Grrr... so it brings us back to xhci issue. Even EP4 workaround wont
>>> work here :( Suddenly i have no more ideas.
>>>
>>> Sarah, it's your turn now.
>>
>> Christian,
>> can you please provide some more info about your xhci controller. I'll
>> try to get me same.
>
> Well, it's a laptop (HP DV6-6003EG). I recon that getting 100% the
> same setup will be difficult. However, since the uPD720200 was/is
> very popular, it should be very easy to find one. [It's probably
> on all of these "10 euro usb-3.0 pcie-adapters". So as long as you
> got a free 1x-pcie port you should be good.]
>
> Here's the lspci summary:
>
> 19:00.0 USB controller [0c03]: NEC Corporation uPD720200 USB 3.0 Host Controller [1033:0194] (rev 04) (prog-if 30 [XHCI])
>          Subsystem: Hewlett-Packard Company Device [103c:1657]
>          Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
>          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
>          Latency: 0, Cache Line Size: 64 bytes
>          Interrupt: pin A routed to IRQ 19
>          Region 0: Memory at d3400000 (64-bit, non-prefetchable) [size=8K]
>          Capabilities: <access denied>
>          Kernel driver in use: xhci_hcd
>

Thx... i purchased on random on ebay, will see what i get.

I know now why carl9170 don't triggering this bug. Carl uses EP4 as 
Interrupt with packet size 64. ath9k-htc initially have EP4=Intr, 
Interval=1, but will reconfigure it to Bulk, Interval=0.
It mean, before usb suspend EP4=Bulk, Interval=0 and after resume 
EP4=Intr, Inter=?. May be xhci can't handle some thing like this? Or may 
be interval stay 0, and xhci will overfill usb buffer on adapter - at 
least it looks so.


-- 
Regards,
Oleksij