mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-10-28 07:13:34 +00:00
Code Issues Releases Wiki Activity

mei: vsc: Don't stop/restart mei device during system suspend/resume

Browse source 
commit 9b5e045029 upstream.

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: f6085a96c9 ("mei: vsc: Unregister interrupt handler for system suspend")
Cc: stable@vger.kernel.org # for 6.8+
Reported-by: Hao Yao <hao.yao@intel.com>
Signed-off-by: Wentong Wu <wentong.wu@intel.com>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Jason Chen <jason.z.chen@intel.com>
Tested-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20240527123835.522384-1-wentong.wu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wentong Wu 2024-05-27 20:38:35 +08:00 committed by Greg Kroah-Hartman
parent a56d03b927
commit e759a7d79a
1 changed files with 15 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

39
drivers/misc/mei/platform-vsc.c
View file

@ -399,41 +399,32 @@ static void 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;
struct mei_device *mei_dev;
ret = vsc_tp_request_irq(hw->tp);
if (ret)
return ret;
ret = mei_restart(mei_dev);
if (ret)
goto err_free;
/* 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);