Commit ea104a9e authored by Michael Walle's avatar Michael Walle Committed by Wim Van Sebroeck

watchdog: sp805: fix restart handler

The restart handler is missing two things, first, the registers
has to be unlocked and second there is no synchronization for the
write_relaxed() calls.

This was tested on a custom board with the NXP LS1028A SoC.

Fixes: 6c5c0d48 ("watchdog: sp805: add restart handler")
Signed-off-by: default avatarMichael Walle <michael@walle.cc>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20200327162450.28506-1-michael@walle.ccSigned-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent 2d63908b
......@@ -137,10 +137,14 @@ wdt_restart(struct watchdog_device *wdd, unsigned long mode, void *cmd)
{
struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
writel_relaxed(UNLOCK, wdt->base + WDTLOCK);
writel_relaxed(0, wdt->base + WDTCONTROL);
writel_relaxed(0, wdt->base + WDTLOAD);
writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL);
/* Flush posted writes. */
readl_relaxed(wdt->base + WDTLOCK);
return 0;
}
......
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