The SoundWire master representation needs to evolve to take into account: a) a May 2019 recommendation from Greg KH to remove platform devices b) the need on Intel platforms to support hardware startup only once the power rail dependencies are settled. The SoundWire master is not an independent IP at all. c) the need to deal with external wakes handled by the PCI subsystem in specific low-power modes In case it wasn't clear, the SoundWire subsystem is currently unusable with v5.5 on devices hitting the shelves very soon (race conditions, power management, suspend/resume, etc). v5.6 will only provide interface changes and no functional improvement. We've circled on the same concepts since September 2019, and I hope this direction is now aligned with the suggestions from Vinod Koul and that we can target v5.7 as the 'SoundWire just works(tm)' version. This series is provided as an RFC since it depends on patches already for review. Pierre-Louis Bossart (2): soundwire: bus_type: add master_device/driver support soundwire: intel: transition to sdw_master_device/driver support drivers/soundwire/Makefile | 2 +- drivers/soundwire/bus_type.c | 141 +++++++++++++- drivers/soundwire/intel.c | 96 ++++++---- drivers/soundwire/intel.h | 8 +- drivers/soundwire/intel_init.c | 283 ++++++++++++++++++++++------- drivers/soundwire/master.c | 119 ++++++++++++ drivers/soundwire/slave.c | 7 +- include/linux/soundwire/sdw.h | 83 +++++++++ include/linux/soundwire/sdw_type.h | 36 +++- 9 files changed, 662 insertions(+), 113 deletions(-) create mode 100644 drivers/soundwire/master.c -- 2.20.1 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
