[alsa-devel] [PATCH v5 0/9] soundwire: Add multi link support

[Shreyas NC]

Currently, in the SoundWire subsystem, the concept of stream is
limited to a Master and one or more Slaves(Codecs). This series
aims to add support for multiple Master(s) sharing the same
reference clock and synchronized in the hardware.

This patch series adds:
 - Fix to avoid duplicate stream state assignment
 - Avoid incorrect stream release after configuring Master
 - Helpers to lock bus instances part of the stream
 - Boiler plate conversion of code to support a list of
   Master runtime
 - Support multi link bank switch to support synchronization
   between multiple masters
 - Add Intel platform ops for pre/post bank switch

changes in v5:
 - Add patch to fix duplicate stream state assignment
 - fix incorrect exit which was releasing the stream after
   configuring master
 - In sdw_release_bus_lock(), release the mutex in reverse order
   as suggested by Takashi

changes in v4:
 - Added changes in sdw_stream_runtime structure to track Masters
   added to stream
 - Add changes to support ml_bankswitch only if both the hardware
   supports and the stream is handled by multiple masters

Sanyog Kale (2):
  Documentation: soundwire: Add documentation for multi link
  soundwire: Add support to lock across bus instances

Shreyas NC (6):
  soundwire: Fix duplicate stream state assignment
  soundwire: fix incorrect exit after configuring stream
  soundwire: Initialize completion for defer messages
  soundwire: keep track of Masters in a stream
  soundwire: Add support for multi link bank switch
  soundwire: intel: Add pre/post bank switch ops

Vinod Koul (1):
  soundwire: Handle multiple master instances in a stream

 Documentation/driver-api/soundwire/stream.rst |  28 ++
 drivers/soundwire/bus.c                       |   6 +
 drivers/soundwire/bus.h                       |   4 +
 drivers/soundwire/intel.c                     |  65 ++++
 drivers/soundwire/stream.c                    | 502 +++++++++++++++++++-------
 include/linux/soundwire/sdw.h                 |  12 +-
 6 files changed, 483 insertions(+), 134 deletions(-)

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2.7.4