[alsa-devel] [PATCH v6 00/10] soundwire: Add multi link support

[Sanyog Kale]

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
 - Fix to avoid bus lock acquired twice

changes in v6:
 - Add patch to fix acquiring bus lock twice during master release
 - In sdw_stream_add_master(), perform multi link check at start of
   function as suggested by Pierre
 - Minor comment fixes

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 (3):
  Documentation: soundwire: Add documentation for multi link
  soundwire: Add support to lock across bus instances
  soundwire: Fix acquiring bus lock twice during master release

Shreyas NC (6):
  soundwire: Initialize completion for defer messages
  soundwire: Fix duplicate stream state assignment
  soundwire: fix incorrect exit after configuring stream
  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                    | 511 +++++++++++++++++++-------
 include/linux/soundwire/sdw.h                 |  12 +-
 6 files changed, 489 insertions(+), 137 deletions(-)

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2.13.0