watchdog: dw: save/restore control and timeout across suspend/resume (8c088370) · Commits · 戴 / test

Some platforms lose this state in suspend. It should be safe to do this unconditionally. Signed-off-by:

drivers/watchdog/dw_wdt.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -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)
		@@ -205,6 +208,9 @@ 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;
		@@ -218,6 +224,9 @@ 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;