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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>
This commit is contained in:
Brian Norris 2018-03-09 19:46:07 -08:00 committed by Wim Van Sebroeck
parent a81abbb412
commit 8c088370c2
1 changed files with 9 additions and 0 deletions
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9
drivers/watchdog/dw_wdt.c
View File

@ -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;