soundwire: cadence_master: wait and cancel cdns->work before clock stop - #5863
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soundwire: cadence_master: wait and cancel cdns->work before clock stop#5863bardliao wants to merge 1 commit into
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Pull request overview
This PR aims to prevent peripheral-event handling from racing with the SoundWire Cadence master clock-stop sequence, which can otherwise lead to IO transfer timeouts during suspend/clock stop.
Changes:
- Adds a workqueue cancellation/wait step before stopping the bus clock in
sdw_cdns_clock_stop().
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| /* | ||
| * wait for any in-flight peripheral event handling to complete before | ||
| * stopping the clock | ||
| */ | ||
| cancel_work_sync(&cdns->work); |
A peripheral event could happen druing the clock stup process. We need to wait for the event be handled before stoping the bus clock. Otherwise, we will get the IO transfer timed out issue. Fixes: af4cc91 ("soundwire: cadence: mask Slave interrupt before stopping clock") Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
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A peripheral event could happen druing the clock stup process. We need to wait for the event be handled before stoping the bus clock. Otherwise, we will get the IO transfer timed out issue.
Fixes: af4cc91 ("soundwire: cadence: mask Slave interrupt before stopping clock")