Some platforms lose this state in suspend. It should be safe to do this
unconditionally.
Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
---
drivers/watchdog/dw_wdt.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 6925d3e6c6b3..094986047194 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -57,6 +57,9 @@ struct dw_wdt {
unsigned long rate;
struct watchdog_device wdd;
struct reset_control *rst;
+ /* Save/restore */
+ u32 control;
+ u32 timeout;
};
#define to_dw_wdt(wdd) container_of(wdd, struct dw_wdt, wdd)
@@ -204,6 +207,9 @@ static int dw_wdt_suspend(struct device *dev)
{
struct dw_wdt *dw_wdt = dev_get_drvdata(dev);
+ dw_wdt->control = readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);
+ dw_wdt->timeout = readl(dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
+
clk_disable_unprepare(dw_wdt->clk);
return 0;
@@ -217,6 +223,9 @@ static int dw_wdt_resume(struct device *dev)
if (err)
return err;
+ writel(dw_wdt->timeout, dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
+ writel(dw_wdt->control, dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);
+
dw_wdt_ping(&dw_wdt->wdd);
return 0;
--
2.16.2.660.g709887971b-goog
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