linux-kernel - [PATCH 6/7] soundwire: intel: Don't disable pm

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Date:   Wed, 7 Sep 2022 11:14:01 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <vkoul@...nel.org>, <yung-chuan.liao@...ux.intel.com>,
        <pierre-louis.bossart@...ux.intel.com>, <lgirdwood@...il.com>,
        <peter.ujfalusi@...ux.intel.com>,
        <ranjani.sridharan@...ux.intel.com>,
        <kai.vehmanen@...ux.intel.com>, <daniel.baluta@....com>,
        <sanyog.r.kale@...el.com>, <broonie@...nel.org>
CC:     <alsa-devel@...a-project.org>,
        <sound-open-firmware@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH 6/7] soundwire: intel: Don't disable pm_runtime until children are removed

When the bus driver is removed the child drivers will be removed first.
These may need to perform bus transactions to shut down, and the device
driver core will runtime-resume the driver before calling its remove().

For this to work the pm_runtime of the bus driver must still be enabled.
So do not disable pm_runtime until the bus driver has been unregistered.

Though this could be done by powering-up the bus driver and then
disabling its pm_runtime with the bus still powered-up, there's no
need to bypass the standard device framework behaviour.

Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 drivers/soundwire/intel.c      | 4 +++-
 drivers/soundwire/intel_init.c | 1 -
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index d5e723a9c80b..3345310e979c 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1504,7 +1504,7 @@ static void intel_link_remove(struct auxiliary_device *auxdev)
 	struct sdw_bus *bus = &cdns->bus;
 
 	/*
-	 * Since pm_runtime is already disabled, we don't decrease
+	 * Since pm_runtime will be disabled, we don't decrease
 	 * the refcount when the clock_stop_quirk is
 	 * SDW_INTEL_CLK_STOP_NOT_ALLOWED
 	 */
@@ -1513,6 +1513,8 @@ static void intel_link_remove(struct auxiliary_device *auxdev)
 		snd_soc_unregister_component(dev);
 	}
 	sdw_bus_master_delete(bus);
+
+	pm_runtime_disable(&auxdev->dev);
 }
 
 int intel_link_process_wakeen_event(struct auxiliary_device *auxdev)
diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c
index 078e01f67830..ce26d2df088a 100644
--- a/drivers/soundwire/intel_init.c
+++ b/drivers/soundwire/intel_init.c
@@ -115,7 +115,6 @@ static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx)
 
 		ldev = ctx->ldev[i];
 
-		pm_runtime_disable(&ldev->auxdev.dev);
 		if (!ldev->link_res.clock_stop_quirks)
 			pm_runtime_put_noidle(ldev->link_res.dev);
 
-- 
2.30.2