• Takashi Sakamoto's avatar
    ALSA: fireworks: drop reuse of incoming packet parameter for ougoing packet parameter · eb4a378f
    Takashi Sakamoto authored
    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=361Signed-off-by: 's avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
    Signed-off-by: 's avatarTakashi Iwai <tiwai@suse.de>
    eb4a378f
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