RE: Stall due to babble when reading card ATR from CCID device using UHCI

[Aleš Nesrsta]

Hi Johan,

support of companion controllers should work, it is included in driver.

But You need to load both modules - for EHCI and OHCI/UHCI.
Also order of drivers loading can be critical, I suggest first to load
EHCI and then OHCI/UHCI. In fact, also reverse order should work - but
EHCI probably resets USB devices configured by OHCI/UHCI driver
It works on my computer - I have EHCI with UHCI companion controllers.

But because my knowledges (and HW for testing, and time etc. ...) are
very limited, there could be some reasons why companion drivers will not
work. So, if it will not work for You even if You load right
EHCI/companion driver combination, it will be interesting to find the
reason. In this case, for the first look try to send to me outputs of
"lspci -vvv" and "lsusb -vvv" (from Linux command line, not from
GRUB :-) ).

If You will play with EHCI driver, don't forget known problems of EHCI
drivers which are still not fixed (details see in little bit older post
in thread "[PATCH] EHCI driver - USB 2.0 support") - I am unfortunately
too busy for long time to maintain it, sorry.

Best regards
Ales


Lenthamre Johan píše v Po 07. 11. 2011 v 13:09 +0000:
> Hi Ales,
> 
> I'm fairly new to USB at this lower level, and I realized that I used the 
> wrong read API call. Since the ATR is of variable size I should've use the 
> grub_usb_bulk_read_extended() call. Reading less resulted in babble and 
> reading too much in a timeout. Using read_extended() worked fine.
> 
> Ales, I also downloaded your EHCI branch; any idea when/if it will support 
> companion controllers?
> 
> Anyhow, thanks for your input!
> 
> Regards,
> 
> /Johan
> 
> -----Original Message-----
> From: address@hidden [mailto:address@hidden On Behalf Of Aleš Nesrsta
> Sent: den 4 november 2011 22:21
> To: The development of GNU GRUB
> Subject: Re: Stall due to babble when reading card ATR from CCID device using 
> UHCI
> 
> Hi,
> 
> AFAIK, the babble is fatal bus error which should not normally occur, so if 
> You get it regularly, there is probably something wrong in protocol data / 
> parameters / request sent into device.
> I expect that only reset of the device or some class-specific reset can help 
> in recovery. Try see into related CCID class specification or USB
> 1.1 specification for bubble recovery.
> Unfortunately I don't know USB CCID class device protocol (and I have no time 
> to study it yet...), so I cannot help You more.
> 
> BR,
> Ales
> 
> Lenthamre Johan píše v Čt 03. 11. 2011 v 10:04 +0000:
> > Hi,
> > 
> > When reading card ATR from a CCID device (RDR_to_PC_DataBlock), the bulk-in 
> > endpoint is stalled due to babble. I still get the complete ATR though. 
> > I've successfully issued other commands, such as PC_to_RDR_GetSlotStatus 
> > and read back the result ok. The reader is a 2.0 device plugged into a 1.1 
> > controller using GRUB's UHCI driver. The TD status is 0x18500009; stall + 
> > babble. I am not really sure where to go from here or where to start 
> > looking. Any hints are appreciated.
> > 
> > Clear halt doesn't solve the issue.
> > 
> > BR
> > 
> > /Johan
> > 
> > ---------------------------------------
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> > Software Engineer
> > Command and Control Systems Division
> > Security and Defence Solutions
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