On Mon, 17 Jun 2019 10:15:00 +0200, Takashi Sakamoto wrote: > > Hi, > > This patchset is the last part of patches for all of drivers in ALSA > firewire stack to reserve/release isochronous resources in > pcm.hw_params/hw_free callbacks, like the other patchsets: > > https://mailman.alsa-project.org/pipermail/alsa-devel/2019-June/150118.html > https://mailman.alsa-project.org/pipermail/alsa-devel/2019-June/150863.html > > In current implementation, the resources are reserved at the same time > to start packet streaming, and released at the same time to stop packet > streaming. However, once allocated, the resources are available > independent of lifetime of each of packet streaming. > > The isochronous resources are the resources of IEEE 1394 bus. On the > other side of view, it's a kind of resources of hardware to maintain > the bus (isochronous resource manager). For this kind of reservation and > release, hw_params and hw_free operations are suitable in ALSA PCM > interface. > > Ideally, the operation to reserve/release isochronous resource should > be separated from the operation to start/stop packet streaming. However, > IEEE 1394 bus has reset event. Once reset occurs, isochronous resource > manager releases allocated resources. The resources should be > reallocated by requesters themselves. For this reason, in this patchset, > bus generation is checked before starting packet streaming. If > generation is updated, reallocation is requested to isochronous > resource manager, then packet streaming starts. > > Takashi Sakamoto (10): > ALSA: firewire-motu: unify the count of subscriber for packet > streaming > ALSA: firewire-motu: unify midi callback function > ALSA: firewire-motu: add helper function to keep isochronous resources > ALSA: firewire-motu: code refactoring for condition to stop streaming > ALSA: firewire-motu: rename helper functions to begin/finish streaming > session > ALSA: firewire-motu: minor code refactoring to stop isochronous > context > ALSA: firewire-motu: code refactoring to finish streaming session > ALSA: firewire-motu: reserve/release isochronous resources in > pcm.hw_params/hw_free callbacks > ALSA: firewire-motu: update isochronous resources when starting packet > streaming after bus-reset > ALSA: firewire-motu: code refactoring for pcm.hw_params/hw_free > callbacks Applied all ten patches now. Thanks. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
