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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2021-05-22 10:32:58 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-05-22 08:46:41 +0200 |
| commit | 8070d2652e735585d31a50ff4f9bbaf2b5a49b10 (patch) | |
| tree | 7e4a3e293b5da5c381f918d5568f2c2d0e53f288 /sound/firewire/amdtp-stream.h | |
| parent | 344f0f821a7ee77832f04451e616f313b7d93f1a (diff) | |
ALSA: firewire-lib: add flag to unaware of syt in CIP header
Many devices are unaware of syt field in rx CIP for playback timing.
This commit adds a flag to cancel processing syt field. Actually,
syt calculation is required to decide the number of events per rx packet.
The flag put 0xffff to CIP header of rx packet. On the other hand,
The value of syt field in CIP header of tx packet is unavailable. The
sequence of packet descriptor for tx packet includes 0 for the offset
of syt field to avoid computation.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210522013303.49596-2-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/amdtp-stream.h')
| -rw-r--r-- | sound/firewire/amdtp-stream.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sound/firewire/amdtp-stream.h b/sound/firewire/amdtp-stream.h index b362a6499265..6c4d277dc0dd 100644 --- a/sound/firewire/amdtp-stream.h +++ b/sound/firewire/amdtp-stream.h @@ -35,6 +35,8 @@ * @CIP_NO_HEADERS: a lack of headers in packets * @CIP_UNALIGHED_DBC: Only for in-stream. The value of dbc is not alighed to * the value of current SYT_INTERVAL; e.g. initial value is not zero. + * @CIP_UNAWARE_SYT: For outgoing packet, the value in SYT field of CIP is 0xffff. + * For incoming packet, the value in SYT field of CIP is not handled. */ enum cip_flags { CIP_NONBLOCKING = 0x00, @@ -48,6 +50,7 @@ enum cip_flags { CIP_HEADER_WITHOUT_EOH = 0x80, CIP_NO_HEADER = 0x100, CIP_UNALIGHED_DBC = 0x200, + CIP_UNAWARE_SYT = 0x400, }; /** @@ -143,7 +146,6 @@ struct amdtp_stream { // To generate CIP header. unsigned int fdf; - int syt_override; // To generate constant hardware IRQ. unsigned int event_count; |