watchdog: sp805: fix restart handler
commit5.4-rM2-2.2.x-imx-squashedea104a9e4d
upstream. 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:6c5c0d48b6
("watchdog: sp805: add restart handler") Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20200327162450.28506-1-michael@walle.cc Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent
41d097c833
commit
9a9eae7852
|
@ -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;
|
||||
}
|
||||
|
||||
|
|
Loading…
Reference in New Issue