linux-kernel - [PATCH 4/7] watchdog: imx7ulp

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Message-Id: <20220816043643.26569-5-alice.guo@oss.nxp.com>
Date:   Tue, 16 Aug 2022 12:36:40 +0800
From:   "Alice Guo (OSS)" <alice.guo@....nxp.com>
To:     wim@...ux-watchdog.org, linux@...ck-us.net, shawnguo@...nel.org,
        s.hauer@...gutronix.de, festevam@...il.com
Cc:     kernel@...gutronix.de, linux-imx@....com,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/7] watchdog: imx7ulp_wdt: Fix RCS timeout issue

From: Ye Li <ye.li@....com>

According to measure on i.MX7ULP and i.MX8ULP, the RCS done needs
about 3400us and 6700us respectively. So current 20us timeout is
not enough. When reconfiguring is on-going, unlock and configure CS
will lead to unknown result.

Increase the wait timeout value to 10ms and check the return value
of RCS wait to fix the issue

Signed-off-by: Ye Li <ye.li@....com>
Signed-off-by: Alice Guo <alice.guo@....com>
Reviewed-by: Jacky Bai <ping.bai@....com>
Acked-by: Jason Liu <jason.hui.liu@....com>
---
 drivers/watchdog/imx7ulp_wdt.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
index a0f6b8cea78f..12715c248688 100644
--- a/drivers/watchdog/imx7ulp_wdt.c
+++ b/drivers/watchdog/imx7ulp_wdt.c
@@ -39,7 +39,7 @@
 #define DEFAULT_TIMEOUT	60
 #define MAX_TIMEOUT	128
 #define WDOG_CLOCK_RATE	1000
-#define WDOG_WAIT_TIMEOUT	20
+#define WDOG_WAIT_TIMEOUT	10000
 
 static bool nowayout = WATCHDOG_NOWAYOUT;
 module_param(nowayout, bool, 0000);
@@ -80,7 +80,7 @@ static int imx7ulp_wdt_enable(struct watchdog_device *wdog, bool enable)
 		writel(val | WDOG_CS_EN, wdt->base + WDOG_CS);
 	else
 		writel(val & ~WDOG_CS_EN, wdt->base + WDOG_CS);
-	imx7ulp_wdt_wait(wdt->base, WDOG_CS_RCS);
+	ret = imx7ulp_wdt_wait(wdt->base, WDOG_CS_RCS);
 
 enable_out:
 	local_irq_enable();
@@ -127,7 +127,9 @@ static int imx7ulp_wdt_set_timeout(struct watchdog_device *wdog,
 	if (ret)
 		goto timeout_out;
 	writel(val, wdt->base + WDOG_TOVAL);
-	imx7ulp_wdt_wait(wdt->base, WDOG_CS_RCS);
+	ret = imx7ulp_wdt_wait(wdt->base, WDOG_CS_RCS);
+	if (ret)
+		goto timeout_out;
 
 	wdog->timeout = timeout;
 
-- 
2.17.1