From: Anson Huang <Anson.Huang@nxp.com>
Date: Wed, 9 Oct 2019 07:37:47 +0000 (+0800)
Subject: watchdog: imx_sc_wdt: Pretimeout should follow SCU firmware format
X-Git-Tag: v5.3.15~70
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=367a4cd185a2c3d119e8780741543ae0c517526c;p=thirdparty%2Fkernel%2Fstable.git

watchdog: imx_sc_wdt: Pretimeout should follow SCU firmware format

[ Upstream commit 2c50a6b825b3463a7600d6e6acadba73211c3d2c ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/watchdog/imx_sc_wdt.c b/drivers/watchdog/imx_sc_wdt.c
index 78eaaf75a263f..9545d1e07421a 100644
--- 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;