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watchdog: aspeed: fix hardware timeout calculation 

[ Upstream commit e7dc481c92060f9ce872878b0b7a08c24713a7e5 ]

Fix hardware timeout calculation in aspeed_wdt_set_timeout function to
ensure the reload value does not exceed the hardware limit.

Fixes: efa859f7d7 ("watchdog: Add Aspeed watchdog driver")
Reported-by: Amithash Prasad <amithash@fb.com>
Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20210417034249.5978-1-rentao.bupt@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tao Ren 2021-04-16 20:42:49 -07:00 committed by Greg Kroah-Hartman
parent 0366238f6a
commit e7de89b8b2
1 changed files with 1 additions and 1 deletions
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2
drivers/watchdog/aspeed_wdt.c
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@ -147,7 +147,7 @@ static int aspeed_wdt_set_timeout(struct watchdog_device *wdd,
wdd->timeout = timeout;
actual = min(timeout, wdd->max_hw_heartbeat_ms * 1000);
actual = min(timeout, wdd->max_hw_heartbeat_ms / 1000);
writel(actual * WDT_RATE_1MHZ, wdt->base + WDT_RELOAD_VALUE);
writel(WDT_RESTART_MAGIC, wdt->base + WDT_RESTART);