On Tue, 11 Jun 2019 15:21:06 +0200, Takashi Sakamoto wrote: > > Hi, > > This patchset is a part of series of patches for all of drivers in > ALSA firewire stack to reserve/release isochronous resources in > pcm.hw_params/hw_free callbacks. > > 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 (12): > ALSA: firewire-digi00x: refactoring to move timing of registration for > isochronous channel > ALSA: firewire-digi00x: code refactoring to finish streaming session > ALSA: firewire-digi00x: simplify error path to begin streaming session > ALSA: firewire-digi00x: code refactoring to keep isochronous resources > ALSA: firewire-digi00x: reserve/release isochronous resources in > pcm.hw_params/hw_free callbacks > ALSA: firewire-digi00x: update isochronous resources when starting > packet streaming after bus-reset > ALSA: firewire-digi00x: code refactoring for pcm.hw_params/hw_free > callbacks > ALSA: dice: code refactoring to stop packet streaming > ALSA: dice: code refactoring to keep isochronous resources > ALSA: dice: reserve/release isochronous resources in > pcm.hw_params/hw_free callbacks > ALSA: dice: update isochronous resources when starting packet > streaming after bus-reset > ALSA: dice: code refactoring for pcm.hw_params/hw_free callbacks Applied all twelve patches. Thanks. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
