From: Pierre-Louis Bossart <[email protected]> Previous patches took care of the case where the master device is pm_runtime 'suspended' when a system suspend occurs.
In the case where the master device was not suspended, e.g. if suspend occurred while streaming audio, Intel validation noticed a race condition: the pm_runtime suspend may conflict with the enumeration started by the system resume. This can be simply fixed by updating the status before exiting system resume. GitHub issue: https://github.com/thesofproject/linux/issues/1482 Signed-off-by: Pierre-Louis Bossart <[email protected]> Signed-off-by: Bard Liao <[email protected]> --- drivers/soundwire/intel.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 284e5c9d240a..b7d8ea6b331e 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1531,6 +1531,18 @@ static int intel_resume(struct device *dev) return ret; } + /* + * after system resume, the pm_runtime suspend() may kick in + * during the enumeration, before any children device force the + * master device to remain active. Using pm_runtime_get() + * routines is not really possible, since it'd prevent the + * master from suspending. + * A reasonable compromise is to update the pm_runtime + * counters and delay the pm_runtime suspend by several + * seconds, by when all enumeration should be complete. + */ + pm_runtime_mark_last_busy(dev); + return ret; } -- 2.17.1
