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

[Aleš Nesrsta]

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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