kern/113785: [firewire] dropouts when playing DV on firewire

[Dieter]

The following reply was made to PR kern/113785; it has been noted by GNATS.

From: Dieter <freebsd at sopwith.solgatos.com>
To: "Hidetoshi Shimokawa" <simokawa at freebsd.org>
Cc: bug-followup at freebsd.org
Subject: Re: kern/113785: [firewire] dropouts when playing DV on firewire 
Date: Tue, 20 Nov 2007 23:40:44 +0000

 > There is no initialization packet to send streams;
 
 By initialization, I meant whatever conversation FreeBSD and the
 camcorder have once they are both up.
 
 > however,
 > it might be a problem who is the cycle/bus/IR manager.
 > Can you see some difference of the output of the fwcontrol(8) and demsg(8)
 > in node-id, cycle master and etc. between success and failed cases?
 
 Yes, we have a couple of new clues:
 
 	When FreeBSD says "CYCLEMASTER mode" it does not work.
 	When FreeBSD says "non CYCLEMASTER mode" it works.
 
 Also:
 
   The controller that works (if booted in correct order):
 
 	just bsd:
 	# fwcontrol -u 1 -t
 	crc_len: 3 generation:2 node_count:1 sid_count:1
 	id link gap_cnt speed delay cIRM power port0 port1 port2 ini more
 	00    1       5  S400     0    1   -9W     -     -         1    0
 
 	now power up camcorder (does not work):
 
 	# fwcontrol -u 1 -t
 	crc_len: 4 generation:3 node_count:2 sid_count:2
 	id link gap_cnt speed delay cIRM power port0 port1 port2 ini more
 	00    1      63  S100     0    1    0W     -     P         1    0
 	01    1       5  S400     0    1   -9W     -     C         0    0
 
 	Looks like the S400 & non-zero power device (BSD box) changed id from 00 to 01?
 
 	after booting camcorder and FreeBSD in correct order (works):
 
 	# fwcontrol -u 1 -t
 	crc_len: 4 generation:1 node_count:2 sid_count:2
 	id link gap_cnt speed delay cIRM power port0 port1 port2 ini more
 	00    1      63  S400     0    1   -9W     -     P         1    0
 	01    1      63  S100     0    1    0W     -     C         0    0
 
 	Note that the BSD box is id 00.
 
   The controller that never works:
 
 	# fwcontrol -u 0 -t
 	crc_len: 4 generation:2 node_count:2 sid_count:2
 	id link gap_cnt speed delay cIRM power port0 port1 port2 ini more
 	00    1       5  S100     0    1    0W     -     P         0    0
 	01    1       5  S400     0    1   15W     C     -         1    0
 
 	The BSD box is id 01.
 	Perhaps the "C" showing up under port0 instead of port1 is significant?
 
   So: if the BSD box is id 00, camcorder is id 01 -> works
       if the BSD box is id 01, camcorder is id 00 -> does not work
 
 > Thanks for a fix for the compiler warning.
 
 You're welcome.