watchdog: imx_sc_wdt: Pretimeout should follow SCU firmware format

SCU firmware calculates pretimeout based on current time stamp
instead of watchdog timeout stamp, need to convert the pretimeout
to SCU firmware's timeout value.

Fixes: 15f7d7fc5542 ("watchdog: imx_sc: Add pretimeout support")
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
index 7ea5cf5..8ed89f0 100644 (file)
--- a/drivers/watchdog/imx_sc_wdt.c
+++ b/drivers/watchdog/imx_sc_wdt.c
@@ -99,8 +99,14 @@ static int imx_sc_wdt_set_pretimeout(struct watchdog_device *wdog,
 {
        struct arm_smccc_res res;
 
+       /*
+        * SCU firmware calculates pretimeout based on current time
+        * stamp instead of watchdog timeout stamp, need to convert
+        * the pretimeout to SCU firmware's timeout value.
+        */
        arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_PRETIME_WDOG,
-                     pretimeout * 1000, 0, 0, 0, 0, 0, &res);
+                     (wdog->timeout - pretimeout) * 1000, 0, 0, 0,
+                     0, 0, &res);
        if (res.a0)
                return -EACCES;