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    Subject[PATCH 2/2] watchdog: dw: save/restore control and timeout across suspend/resume
    Date
    Some platforms lose this state in suspend. It should be safe to do this
    unconditionally.

    Signed-off-by: Brian Norris <briannorris@chromium.org>
    ---
    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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