this patchset applies on top of "[PATCH v3 00/15] soundwire: intel: implement new ASoC interfaces".
It implements a series of improvements for: a) interrupt handling on Intel platforms in MSI mode b) race conditions on codec probe and enumeration c) suspend-resume issues (clock-stop mode not supported for now) d) underflow handling e) updates to the stream state machine which did not support valid ALSA transitions.
These patches were tested extensively on 4 different platforms and are viewed as required for any sort of SoundWire-based product. While tested extensively on Intel platforms only, they should also benefit Qualcomm platforms who haven't yet enabled power management.
Changes since v2: (no feedback received since November 6) Added idle scheduling to deal with pm_runtime issues when devices are exposed in the DSDT, but are not populated on the board. A quirk is introduced to deal with potential cases where the devices might be powered at a later time, in which case it's legit to leave the bus active. Fixed .prepare callback to handle both underflow and resume cases. The previous version was incorrect in the first case and did not follow recommended programming sequence Fixed an additional race condition leading to a timeout when the codec device was suspended while the master remained active. Fixed a couple of warnings reported by static analysis Removed non-essential pr_err() traces in stream.c, left others when useful Changed subject of patches dealing with race conditions to make sure reviewers can link with the interface changes.
Changes since v1: (no feedback received since October 23) added support for initialization_complete, integration with Realtek codecs exposed an additional race condition between the resume operation and restoration of settings in separate thread triggered by Slave status change. No other functional change
Bard Liao (3): soundwire: intel/cadence: fix timeouts in MSI mode soundwire: stream: only prepare stream when it is configured. soundwire: intel: reinitialize IP+DSP in .prepare(), but only when resuming
Pierre-Louis Bossart (19): soundwire: bus: fix race condition with probe_complete signaling soundwire: bus: add PM/no-PM versions of read/write functions soundwire: bus: write Slave Device Number without runtime_pm soundwire: intel: add helpers for link power down and shim wake soundwire: intel: Add basic power management support soundwire: intel: add pm_runtime support soundwire: intel: reset pm_runtime status during system resume soundwire: bus: add helper to reset Slave status to UNATTACHED soundwire: intel: call helper to reset Slave states on resume soundwire: bus: check first if Slaves become UNATTACHED soundwire: bus: fix race condition with enumeration_complete signaling soundwire: bus: fix race condition with initialization_complete signaling soundwire: bus: fix race condition by tracking UNATTACHED transition soundwire: intel: disable pm_runtime when removing a master soundwire: bus: disable pm_runtime in sdw_slave_delete soundwire: stream: remove redundant pr_err traces soundwire: stream: update state machine and add state checks soundwire: stream: do not update parameters during DISABLED-PREPARED transition soundwire: intel: pm_runtime idle scheduling
Documentation/driver-api/soundwire/stream.rst | 63 ++- drivers/soundwire/bus.c | 169 +++++++- drivers/soundwire/bus.h | 9 + drivers/soundwire/bus_type.c | 5 + drivers/soundwire/cadence_master.c | 17 +- drivers/soundwire/cadence_master.h | 8 + drivers/soundwire/intel.c | 400 ++++++++++++++++-- drivers/soundwire/intel.h | 2 + drivers/soundwire/intel_init.c | 45 +- drivers/soundwire/slave.c | 4 + drivers/soundwire/stream.c | 71 +++- include/linux/soundwire/sdw.h | 1 + include/linux/soundwire/sdw_intel.h | 4 + 13 files changed, 714 insertions(+), 84 deletions(-)