From: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
When a watchdog timeout is set in the linux kernel, the FORCE_UPDATE bit is set.
Use this to recognize a system reset that was triggered by the watchdog.
Since only the wdt part of the kernel driver sets this bit, this is a safe
distinguishing feature.
Signed-off-by: Steffen Trumtrar <s.trumtrar@xxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
drivers/watchdog/im28wd.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/watchdog/im28wd.c b/drivers/watchdog/im28wd.c
index 3e73ecd62e7c..a9093a7b51c9 100644
--- a/drivers/watchdog/im28wd.c
+++ b/drivers/watchdog/im28wd.c
@@ -176,6 +176,13 @@ static void __maybe_unused imx28_detect_reset_source(const struct imx28_wd *p)
reset_source_set(RESET_RST);
return;
}
+ reg = readl(p->regs + MXS_RTC_PERSISTENT1);
+ if (reg & MXS_RTC_PERSISTENT1_FORCE_UPDATER) {
+ writel(MXS_RTC_PERSISTENT1_FORCE_UPDATER,
+ p->regs + MXS_RTC_PERSISTENT1 + MXS_RTC_CLR_ADDR);
+ reset_source_set(RESET_WDG);
+ return;
+ }
reset_source_set(RESET_RST);
}
--
2.1.4
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