soundWire: intel_auxdevice: resume 'sdw-master' on startup and system resume
authorPierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Thu, 3 Aug 2023 06:52:20 +0000 (14:52 +0800)
committerVinod Koul <vkoul@kernel.org>
Fri, 11 Aug 2023 06:54:56 +0000 (07:54 +0100)
commitf9031288110589c8f565683a182f194110338d65
tree02ec22fcdd4a3d01c62e342b1d3f74801f3c34a1
parent3d71f43f8a59a62c6ab832d4e73a69bae22e13b7
soundWire: intel_auxdevice: resume 'sdw-master' on startup and system resume

The SoundWire bus is handled with a dedicated device, which is placed
between the Intel auxiliary device and peripheral devices, e.g.

soundwire_intel.link.0/sdw-master-0/sdw:0:025d:0711:01

The functionality of this 'sdw-master' device is limited, specifically
for pm_runtime the ASoC framework will not rely on
pm_runtime_get_sync() since it does not register any components. It
will only change status thanks to the parent-child relationship which
guarantees that the 'sdw-master' device will be pm_runtime resumed
before any peripheral device.

However on startup and system resume it's possible that only the
auxiliary device is pm_runtime active, and the peripheral will only
become active during its io_init routine, leading to another
occurrence of the error reported by the pm_runtime framework:

rt711 sdw:0:025d:0711:00: runtime PM trying to activate child device
sdw:0:025d:0711:00 but parent (sdw-master-0) is not active

This patch suggests aligning the sdw-master device status to that of
the auxiliary device. The difference between the two is completely
notional and their pm_status shouldn't be different during the startup
and system resume steps.

This problem was exposed by recent changes in the timing of the bus
reset, but was present in this driver since we introduced pm_runtime
support.

Closes: https://github.com/thesofproject/linux/issues/4328
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Tested-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20230803065220.3823269-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
drivers/soundwire/intel_auxdevice.c