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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>
This commit is contained in:
Sai Prakash Ranjan 2019-01-17 20:49:42 +05:30 committed by Wim Van Sebroeck
parent f17b5f06cb
commit 671cdde36e
1 changed files with 23 additions and 0 deletions
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23
drivers/watchdog/qcom-wdt.c
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@ -245,6 +245,28 @@ static int qcom_wdt_remove(struct platform_device *pdev)
return 0; 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[] = { static const struct of_device_id qcom_wdt_of_table[] = {
{ .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr }, { .compatible = "qcom,kpss-timer", .data = reg_offset_data_apcs_tmr },
{ .compatible = "qcom,scss-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 = { .driver = {
.name = KBUILD_MODNAME, .name = KBUILD_MODNAME,
.of_match_table = qcom_wdt_of_table, .of_match_table = qcom_wdt_of_table,
.pm = &qcom_wdt_pm_ops,
}, },
}; };
module_platform_driver(qcom_watchdog_driver); module_platform_driver(qcom_watchdog_driver);