linux-kernel - [PATCH 0/2] soundwire: improve pm

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Message-Id: <20230803065220.3823269-1-yung-chuan.liao@linux.intel.com>
Date:   Thu,  3 Aug 2023 14:52:18 +0800
From:   Bard Liao <yung-chuan.liao@...ux.intel.com>
To:     alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, linux-kernel@...r.kernel.org,
        pierre-louis.bossart@...ux.intel.com, bard.liao@...el.com
Subject: [PATCH 0/2] soundwire: improve pm_runtime handling

This patchset improves the pm_runtime behavior in rare corner cases
identified by the Intel CI in the last 6 months.

a) in stress-tests, it's not uncommon to see the following type of
warnings when the codec reports as ATTACHED

    "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 warning was not correlated with any functional issue, but it
exposed a design issue on when to enable pm_runtime. The recommended
practice in the pm_runtime documentation is to keep the devices in
'suspended' mode and mark them as 'active' when they are really
functional.

Pierre-Louis Bossart (2):
  soundwire: intel_auxdevice: enable pm_runtime earlier on startup
  soundWire: intel_auxdevice: resume 'sdw-master' on startup and system
    resume

 drivers/soundwire/intel_auxdevice.c | 27 +++++++++++++++++++--------
 1 file changed, 19 insertions(+), 8 deletions(-)

-- 
2.25.1