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watchdog: sbsa: Test WDOG_HW_RUNNING bit in suspend and resume

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If the sbsa_gwdt is enabled by BIOS, the kernel set WDOG_HW_RUNNING bit
and keep it alive before anyone else would open it. When system suspend,
the sbsa_gwdt would not be disabled because WDOG_ACTIVE is not set. Then
the sbsa_gwdt would reach timeout since no one touch it during system
suspend.

To solve this, just test WDOG_HW_RUNNING bit in suspend and disable the
sbsa_gwdt if the bit is set, then reopen it accordingly in resume
process.

Signed-off-by: Wang Wensheng <wangwensheng4@huawei.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230301113702.76437-1-wangwensheng4@huawei.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Wang Wensheng 2023-03-01 11:37:02 +00:00 committed by Wim Van Sebroeck
parent 96c6e56d3e
commit 74d6c68c74
1 changed files with 2 additions and 2 deletions
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4
drivers/watchdog/sbsa_gwdt.c
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@ -361,7 +361,7 @@ static int __maybe_unused sbsa_gwdt_suspend(struct device *dev)
{
struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
if (watchdog_active(&gwdt->wdd))
if (watchdog_hw_running(&gwdt->wdd))
sbsa_gwdt_stop(&gwdt->wdd);
return 0;
@ -372,7 +372,7 @@ static int __maybe_unused sbsa_gwdt_resume(struct device *dev)
{
struct sbsa_gwdt *gwdt = dev_get_drvdata(dev);
if (watchdog_active(&gwdt->wdd))
if (watchdog_hw_running(&gwdt->wdd))
sbsa_gwdt_start(&gwdt->wdd);
return 0;