[PATCH 1/8][SRU][Noble] mei: vsc: Don't stop/restart mei device during system suspend/resume

[You-Sheng Yang]

From: Wentong Wu <wentong.wu at intel.com>

BugLink: https://bugs.launchpad.net/bugs/2067364

The dynamically created mei client device (mei csi) is used as one V4L2
sub device of the whole video pipeline, and the V4L2 connection graph is
built by software node. The mei_stop() and mei_restart() will delete the
old mei csi client device and create a new mei client device, which will
cause the software node information saved in old mei csi device lost and
the whole video pipeline will be broken.

Removing mei_stop()/mei_restart() during system suspend/resume can fix
the issue above and won't impact hardware actual power saving logic.

Fixes: f6085a96c973 ("mei: vsc: Unregister interrupt handler for system suspend")
Cc: stable at vger.kernel.org # for 6.8+
Reported-by: Hao Yao <hao.yao at intel.com>
Signed-off-by: Wentong Wu <wentong.wu at intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus at linux.intel.com>
Tested-by: Jason Chen <jason.z.chen at intel.com>
Tested-by: Sakari Ailus <sakari.ailus at linux.intel.com>
Acked-by: Tomas Winkler <tomas.winkler at intel.com>
Link: https://lore.kernel.org/r/20240527123835.522384-1-wentong.wu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
(cherry picked from commit 9b5e045029d8bded4c6979874ed3abc347c1415c)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/misc/mei/platform-vsc.c | 39 +++++++++++++--------------------
 1 file changed, 15 insertions(+), 24 deletions(-)

diff --git a/drivers/misc/mei/platform-vsc.c b/drivers/misc/mei/platform-vsc.c
index 8db0fcf24e70..5a445f3b96a9 100644
--- a/drivers/misc/mei/platform-vsc.c
+++ b/drivers/misc/mei/platform-vsc.c
@@ -401,41 +401,32 @@ static int mei_vsc_remove(struct platform_device *pdev)
 
 static int mei_vsc_suspend(struct device *dev)
 {
-	struct mei_device *mei_dev = dev_get_drvdata(dev);
-	struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
+	struct mei_device *mei_dev;
+	int ret = 0;
 
-	mei_stop(mei_dev);
+	mei_dev = dev_get_drvdata(dev);
+	if (!mei_dev)
+		return -ENODEV;
 
-	mei_disable_interrupts(mei_dev);
+	mutex_lock(&mei_dev->device_lock);
 
-	vsc_tp_free_irq(hw->tp);
+	if (!mei_write_is_idle(mei_dev))
+		ret = -EAGAIN;
 
-	return 0;
+	mutex_unlock(&mei_dev->device_lock);
+
+	return ret;
 }
 
 static int mei_vsc_resume(struct device *dev)
 {
-	struct mei_device *mei_dev = dev_get_drvdata(dev);
-	struct mei_vsc_hw *hw = mei_dev_to_vsc_hw(mei_dev);
-	int ret;
-
-	ret = vsc_tp_request_irq(hw->tp);
-	if (ret)
-		return ret;
-
-	ret = mei_restart(mei_dev);
-	if (ret)
-		goto err_free;
+	struct mei_device *mei_dev;
 
-	/* start timer if stopped in suspend */
-	schedule_delayed_work(&mei_dev->timer_work, HZ);
+	mei_dev = dev_get_drvdata(dev);
+	if (!mei_dev)
+		return -ENODEV;
 
 	return 0;
-
-err_free:
-	vsc_tp_free_irq(hw->tp);
-
-	return ret;
 }
 
 static DEFINE_SIMPLE_DEV_PM_OPS(mei_vsc_pm_ops, mei_vsc_suspend, mei_vsc_resume);
-- 
2.43.0