linux-sg2042/sound/firewire/fireworks
Takashi Sakamoto eb4a378fc9 ALSA: fireworks: drop reuse of incoming packet parameter for ougoing packet parameter
On Fireworks board module of Echo Audio, TSB43Cx43A (IceLynx Micro, iCEM)
is used to process payload of isochronous packets. There's an public
document of this chip[1]. This document is for firmware programmers to
transfer/receive AMDTP with IEC60958 data format, however in clause 2.5,
2.6 and 2.7, we can see system design to utilize the sequence of value in
SYT field of CIP header. In clause 2.3, we can see the specification of
Audio Master Clock (MCLK) from iCEM.

Well, this clock is actually not used for sampling clock. This can be
confirmed when corresponding driver transfer random value as the sequence
of SYT field. Even if in this case, the unit generates proper sound.

Additionally, in unique command set for this board module, the format
of CIP is changed; for IEC 61883-6 mode which we use, and for Windows
Operating System. In the latter mode, the whole 32 bit field in second CIP
header from Windows driver is used to represent counter of packets (NO-DATA
code is still used for packets without data blocks). If the master clock
was physically used by DSP on the board module, the Windows driver must
have transferred correct sequence of SYT field.

Furthermore, as long as seeing capacities of AudioFire2, AudioFire4,
AudioFire8, AudioFirePre8 and AudioFire12, these models don't support
SYT-Match clock source.

Summary, we have no need to relate incoming/outgoing packets. This commit
drops reusing SYT sequence of incoming packets for outgoing packets.

[1] Using TSB43Cx43A: S/PDIF over 1394 (2003, Texus Instruments
Incorporated)
http://www.ti.com/analog/docs/litabsmultiplefilelist.tsp?literatureNumber=slla148&docCategoryId=1&familyId=361

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2016-05-10 17:03:58 +02:00
..
Makefile ALSA: fireworks/bebob/oxfw/dice: enable to make as built-in 2015-10-18 09:08:11 +02:00
fireworks.c ALSA: fireworks: delayed registration of sound card 2016-03-31 15:36:19 +02:00
fireworks.h ALSA: fireworks: drop reuse of incoming packet parameter for ougoing packet parameter 2016-05-10 17:03:58 +02:00
fireworks_command.c ALSA: fireworks: use u32 type for be32_to_cpup() macro 2015-10-19 11:57:02 +02:00
fireworks_hwdep.c ALSA: fireworks: Use safer way to arrange ring buffer pointer 2014-06-04 14:35:40 +02:00
fireworks_midi.c ALSA: fireworks: change type of substream counter from atomic_t to unsigned int 2015-11-14 17:53:46 +01:00
fireworks_pcm.c ALSA: fireworks: change type of substream counter from atomic_t to unsigned int 2015-11-14 17:53:46 +01:00
fireworks_proc.c ALSA: fireworks: fix specifiers in format strings for propper output 2014-08-05 09:15:20 +02:00
fireworks_stream.c ALSA: fireworks: drop reuse of incoming packet parameter for ougoing packet parameter 2016-05-10 17:03:58 +02:00
fireworks_transaction.c ALSA: firewire: Fix trivial typos in comments 2015-03-10 12:40:30 +01:00