[alsa-devel] [FFADO-devel] [PATCH 18/39] firewire-lib: Add a fallback at RCODE_CANCELLED

Stefan Richter stefanr at s5r6.in-berlin.de
Tue Mar 4 09:33:23 CET 2014

On Mar 04 Jonathan Woithe wrote:
> On Sat, Mar 01, 2014 at 03:20:50PM +0100, Stefan Richter wrote:
> > >> Since FFADO applies 200 ms or more as FCP
> > >> transaction timeout, shouldn't firewire-lib's fcp.c increase
> > >> FCP_TIMEOUT_MS from 125 to 200 or more as well?
> I've personally had nothing to do with devices utilising FCP transactions so
> unfortunately I don't really know.  My feeling is that the authors of the
> respective FFADO drivers would not have applied an FCP timeout of 200 ms if
> there was no demonstrated need for it.  Therefore in the absence of other
> evidence I would be assuming that there are devices which require the higher
> timeout allowed for in FFADO's streaming code.  However, I don't know which
> specific devices these might be.


was added in this FFADO revision:
    10/23/08 09:00:47 (5 years ago)
    * implement our own code to do FCP transactions. the code from libavc
      had too much side-effects.
    * remove libavc1394 as a dependency
    * set the SPLIT_TIMEOUT value for the host controller such that late
      responses by the DM1x00 based devices are not discarded. Should fix
      the issues with FA-101 discovery. (re: #155, #162)

I will look through the libavc1394 source history.
Stefan Richter
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