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

[Pierre-Louis Bossart]

On 07/05/2018 06:46 AM, Shreyas NC wrote:
> 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
It's almost good, I just had a couple of comments on the error cases and 
the lock handling on release.
Can we respin a quick v6?
>
> 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(-)
>