watchdog: dw: save/restore control and timeout across suspend/resume
Some platforms lose this state in suspend. It should be safe to do this unconditionally. Signed-off-by: Brian Norris <briannorris@chromium.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@iguana.be>
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@ -57,6 +57,9 @@ struct dw_wdt {
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unsigned long rate;
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struct watchdog_device wdd;
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struct reset_control *rst;
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/* Save/restore */
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u32 control;
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u32 timeout;
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};
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#define to_dw_wdt(wdd) container_of(wdd, struct dw_wdt, wdd)
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@ -205,6 +208,9 @@ static int dw_wdt_suspend(struct device *dev)
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{
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struct dw_wdt *dw_wdt = dev_get_drvdata(dev);
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dw_wdt->control = readl(dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);
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dw_wdt->timeout = readl(dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
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clk_disable_unprepare(dw_wdt->clk);
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return 0;
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@ -218,6 +224,9 @@ static int dw_wdt_resume(struct device *dev)
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if (err)
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return err;
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writel(dw_wdt->timeout, dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
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writel(dw_wdt->control, dw_wdt->regs + WDOG_CONTROL_REG_OFFSET);
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dw_wdt_ping(&dw_wdt->wdd);
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return 0;
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