Re: [RTF PATCH v3] xhci: process isoc TD properly when there was an error mid TD.

["Michał Pecio" <michal.pecio@gmail.com>]

> I'm afraid we end up tuning that original patch forever
Point taken. This patch is more important, as it fixes total failure
to deal with trivial bit errors on uPD720200.


> Isoc endpoints should use COMP_ISOCH_BUFFER_OVERRUN to indicate
> endpoint hasn't halted like it does in the COMP_BABBLE_DETECTED_ERROR
> case.
> 
> See xhci 6.4.5 "TRB completion codes" Footnote 115
This applies to "TD Babble", which is:
submitted TD size < data from the device <= ESIT payload

Other babble conditions exist related to blatant device bugs (4.10.2.4)
and it looks like some may result in a halt or device disconnection even
on isoch endpoints(?)

Other babbles aren't included in "isoch buffer overrun" per 6.4.5.

I feel like one would need to systematically go through the whole spec
to avoid missing important details or special cases.


Thanks,
Michal