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authorBrian Norris <briannorris@chromium.org>2018-03-10 06:46:07 +0300
committerWim Van Sebroeck <wim@linux-watchdog.org>2018-03-13 21:14:19 +0300
commit8c088370c2a684acad45e0035d9f2dfd85087db0 (patch)
treebc13a303b3006cc0eb4c00e679d9a49cff3355b2 /drivers
parenta81abbb412341e9e3b2d42ed7d310cf71fbb84a8 (diff)
downloadlinux-8c088370c2a684acad45e0035d9f2dfd85087db0.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/watchdog/dw_wdt.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index 918357bccf5e..501aebb5b81f 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)
@@ -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;