[alsa-devel] [PATCH 00/12] ALSA: firewire: configure interval of hw IRQ via ALSA PCM interface

[Takashi Iwai]

On Thu, 17 Oct 2019 17:54:12 +0200,
Takashi Sakamoto wrote:
> 
> Hi,
> 
> ALSA IEC 61883-1/6 packet streaming engine controls OHCI 1394 controller
> to generate hardware IRQ for fixed number (=16) of isoc packets.
> Additionally, the size of packet buffer is fixed for triple of interval
> of hardware IRQ (=48).
> 
> This commit allows ALSA PCM applications to configure these parameters
> by ALSA PCM interface. As a result, the size of PCM period is available
> in the range between 125 usec and 64 msec (or 32 msec). The hardware
> IRQ is scheduled for isoc packet which includes event across PCM period
> boundary.
> 
> Takashi Sakamoto (12):
>   ALSA: firewire-lib: use variable size of queue for isoc packets
>     instead of fixed size
>   ALSA: bebob: share PCM buffer size for both direction
>   ALSA: fireworks: share PCM buffer size for both direction
>   ALSA: oxfw: share PCM buffer size for both direction
>   ALSA: dice: share PCM buffer size for both direction
>   ALSA: firewire-digi00x: share PCM buffer size for both direction
>   ALSA: firewire-tascam: share PCM buffer size for both direction
>   ALSA: firewire-motu: share PCM buffer size for both direction
>   ALSA: fireface: share PCM buffer size for both direction
>   ALSA: firewire-lib: schedule hardware IRQ according to the size of PCM
>     period
>   ALSA: firewire-lib: tune the maximum available size of PCM period
>   ALSA: firewire-lib: tune the minimum available size of PCM period

Applied all 12 patches now.  Thanks.


Takashi