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watchdog: sp805: fix restart handler
commitea104a9e4d
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>
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@ -137,10 +137,14 @@ wdt_restart(struct watchdog_device *wdd, unsigned long mode, void *cmd)
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{
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struct sp805_wdt *wdt = watchdog_get_drvdata(wdd);
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writel_relaxed(UNLOCK, wdt->base + WDTLOCK);
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writel_relaxed(0, wdt->base + WDTCONTROL);
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writel_relaxed(0, wdt->base + WDTLOAD);
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writel_relaxed(INT_ENABLE | RESET_ENABLE, wdt->base + WDTCONTROL);
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/* Flush posted writes. */
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readl_relaxed(wdt->base + WDTLOCK);
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return 0;
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}
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