[Bug 2164967] Re: Fix TAS2783 SoundWire amp resume timeout >5s

** Tags added: kernel-daily-bug -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2164967 Title: Fix TAS2783 SoundWire amp resume timeout >5s Status in HWE Next: New Status in linux package in Ubuntu: New Status in linux-oem-6.17 package in Ubuntu: New Status in linux source package in Noble: New Status in linux-oem-6.17 source package in Noble: In Progress Status in linux source package in Resolute: In Progress Status in linux-oem-6.17 source package in Resolute: New Bug description: [Impact] TAS2783 SoundWire smart amplifiers add >5s to resume on systems with AMD ACP (e.g., ASUS ProArt PX13, HP EliteBook X G2i). Each TAS2783 device waits up to 5s (TAS2783_PROBE_TIMEOUT) for slave->initialization_complete during resume. The SoundWire slaves do not re-enumerate after s2idle on AMD ACP, so the timeout fires for each device sequentially, causing ~15s slow resume on systems with 2-3 TAS2783 amps. After resume, speakers stay silent even though firmware re-downloads successfully. The regcache holds stale pre-suspend values, so subsequent read-modify-write updates (DAPM power-up, SDCA PDE transitions) see "no change" and skip the hardware write. Audio runs without errors while the amplifier remains muted. Error log: slave-tas2783 sdw:0:1:0102:0000:01:8: resume: initialization timed out slave-tas2783 sdw:0:1:0102:0000:01:8: PM: dpm_run_callback(): acpi_subsys_resume returns -110 slave-tas2783 sdw:0:1:0102:0000:01:8: PM: failed to resume: error -110 [Fix] Three patches from upstream sound tree: 1. Commit: 0d6b2d6f93a6 ("ASoC: codecs: tas2783-sdw: Propagate regcache_sync() errors") Upstream: v7.3-rc1 2. Commit: ac6d4f298160 ("ASoC: tas2783: Use new SoundWire enumeration helper") Upstream: v7.2-rc1 3. Commit: b627da430357 ("ASoC: tas2783-sdw: drop stale regcache on uninitialized re-attach") Upstream: linux-next / sound-7.3-rc1 (not yet in released tag) Fixes: 4cc9bd8d7b32 ("ASoc: tas2783A: Add soundwire based codec driver") [Test Plan] Suspend 30 times: $ sudo rtcwake -m mem -s 20 Without patches: resume takes >5s per TAS2783 device, speakers produce no audio after resume, dmesg shows "resume: initialization timed out" and "PM: failed to resume: error -110". With patches: resume completes in <1s, speakers work after resume, no timeout errors in dmesg. [Where problems could occur] Could break TAS2783 SoundWire driver resume and device initialization. The sdw_slave_wait_for_init() helper changes how the driver waits for SoundWire enumeration. If the helper has a bug, resume could hang or return an error for all SoundWire slaves, not just TAS2783. The regcache_drop_region() call removes all cached register values. If the device does not actually lose power during suspend (e.g., S3 instead of S0i3), dropping the cache forces a full re-initialization that is unnecessary and could cause a brief audio glitch on resume. To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/2164967/+subscriptions