lkml.org 
[lkml]   [2016]   [Feb]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[char-misc-next 3/4 V5] watchdog: mei_wdt: re-register device on event
Date
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>
---
V2: rework un/registration in runtime
V3: rebase, runtime unregistration was moved to BDW patch.
V4: Rebase the code over patchset : "watchdog: Replace driver based refcounting"
V5: Rebase

drivers/watchdog/mei_wdt.c | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/mei_wdt.c b/drivers/watchdog/mei_wdt.c
index b93474ec34a1..630bd189f167 100644
--- a/drivers/watchdog/mei_wdt.c
+++ b/drivers/watchdog/mei_wdt.c
@@ -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;
}
--
2.4.3
\
 
 \ /
  Last update: 2016-02-07 22:01    [W:0.040 / U:0.492 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site