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authorSai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>2019-01-17 18:19:42 +0300
committerWim Van Sebroeck <wim@linux-watchdog.org>2019-02-02 16:06:36 +0300
commit671cdde36e26feb509e5cc25c0ca273907eaf914 (patch)
treec435e522d68fd1e57bc4b886213c4b245085f7d9 /drivers/watchdog
parentf17b5f06cb92ef2250513a1e154c47b78df07d40 (diff)
downloadlinux-671cdde36e26feb509e5cc25c0ca273907eaf914.tar.xz
watchdog: qcom: Add suspend/resume support
This adds the support for qcom watchdog suspend and resume when entering and exiting deep sleep states. Otherwise having watchdog active after suspend would result in unwanted crashes/resets if resume happens after a long time. Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog')
-rw-r--r--drivers/watchdog/qcom-wdt.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/watchdog/qcom-wdt.c b/drivers/watchdog/qcom-wdt.c
index 780971318810..5dfd604477a4 100644
--- a/drivers/watchdog/qcom-wdt.c
+++ b/drivers/watchdog/qcom-wdt.c
@@ -245,6 +245,28 @@ static int qcom_wdt_remove(struct platform_device *pdev)
return 0;
}
+static int __maybe_unused qcom_wdt_suspend(struct device *dev)
+{
+ struct qcom_wdt *wdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&wdt->wdd))
+ qcom_wdt_stop(&wdt->wdd);
+
+ return 0;
+}
+
+static int __maybe_unused qcom_wdt_resume(struct device *dev)
+{
+ struct qcom_wdt *wdt = dev_get_drvdata(dev);
+
+ if (watchdog_active(&wdt->wdd))
+ qcom_wdt_start(&wdt->wdd);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(qcom_wdt_pm_ops, qcom_wdt_suspend, qcom_wdt_resume);
+
static const struct of_device_id qcom_wdt_of_table[] = {
{ .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr },
{ .compatible = "qcom,scss-timer", .data = reg_offset_data_apcs_tmr },
@@ -259,6 +281,7 @@ static struct platform_driver qcom_watchdog_driver = {
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = qcom_wdt_of_table,
+ .pm = &qcom_wdt_pm_ops,
},
};
module_platform_driver(qcom_watchdog_driver);