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watchdog: renesas_wdt: don't keep timer value during suspend/resume 

After discussing this mail thread [1] again, we concluded that giving
userspace enough time to prepare is our favourite option. So, do not
keep the time value when suspended but reset it when resuming.

[1] https://patchwork.kernel.org/patch/10252209/

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Wolfram Sang 2018-12-04 13:01:46 +01:00 committed by Wim Van Sebroeck
parent 248e655b45
commit 9077123c68
1 changed files with 4 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/watchdog/renesas_wdt.c
View File

@ -48,7 +48,6 @@ struct rwdt_priv {
void __iomem *base;
struct watchdog_device wdev;
unsigned long clk_rate;
u16 time_left;
u8 cks;
};
@ -268,10 +267,9 @@ static int __maybe_unused rwdt_suspend(struct device *dev)
{
struct rwdt_priv *priv = dev_get_drvdata(dev);
if (watchdog_active(&priv->wdev)) {
priv->time_left = readw(priv->base + RWTCNT);
if (watchdog_active(&priv->wdev))
rwdt_stop(&priv->wdev);
}
return 0;
}
@ -279,10 +277,9 @@ static int __maybe_unused rwdt_resume(struct device *dev)
{
struct rwdt_priv *priv = dev_get_drvdata(dev);
if (watchdog_active(&priv->wdev)) {
if (watchdog_active(&priv->wdev))
rwdt_start(&priv->wdev);
rwdt_write(priv, priv->time_left, RWTCNT);
}
return 0;
}