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SubjectRe: [PATCH 2/2] watchdog: dw: save/restore control and timeout across suspend/resume
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On 03/09/2018 06:44 PM, Brian Norris wrote:
> 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>

> ---
> 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;
>

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