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watchdog: mei_wdt: re-register device on event 

For Intel SKL platform the ME device can inform the host via
asynchronous notification that the watchdog feature was activated
on the device. The activation doesn't require reboot.
In that case the driver registers the watchdog device with the kernel.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Tomas Winkler 2016-02-07 22:46:50 +02:00 committed by Greg Kroah-Hartman
parent ad1cd720b1
commit 3a20a5c339
1 changed files with 26 additions and 2 deletions
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28
drivers/watchdog/mei_wdt.c
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@ -481,6 +481,21 @@ out:
complete(&wdt->response);
}
/*
* mei_wdt_notify_event - callback for event notification
*
* @cldev: bus device
*/
static void mei_wdt_notify_event(struct mei_cl_device *cldev)
{
struct mei_wdt *wdt = mei_cldev_get_drvdata(cldev);
if (wdt->state != MEI_WDT_NOT_REQUIRED)
return;
mei_wdt_register(wdt);
}
/**
* mei_wdt_event - callback for event receive
*
@ -493,6 +508,9 @@ static void mei_wdt_event(struct mei_cl_device *cldev,
{
if (events & BIT(MEI_CL_EVENT_RX))
mei_wdt_event_rx(cldev);
if (events & BIT(MEI_CL_EVENT_NOTIF))
mei_wdt_notify_event(cldev);
}
#if IS_ENABLED(CONFIG_DEBUG_FS)
@ -605,9 +623,15 @@ static int mei_wdt_probe(struct mei_cl_device *cldev,
goto err_out;
}
ret = mei_cldev_register_event_cb(wdt->cldev, BIT(MEI_CL_EVENT_RX),
ret = mei_cldev_register_event_cb(wdt->cldev,
BIT(MEI_CL_EVENT_RX) |
BIT(MEI_CL_EVENT_NOTIF),
mei_wdt_event, NULL);
if (ret) {
/* on legacy devices notification is not supported
* this doesn't fail the registration for RX event
*/
if (ret && ret != -EOPNOTSUPP) {
dev_err(&cldev->dev, "Could not register event ret=%d\n", ret);
goto err_disable;
}