[PATCH 4/7] watchdog: imx7ulp_wdt: Fix RCS timeout issue

From: Alice Guo (OSS)
Date: Tue Aug 16 2022 - 03:27:50 EST


From: Ye Li <ye.li@xxxxxxx>

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@xxxxxxx>
Signed-off-by: Alice Guo <alice.guo@xxxxxxx>
Reviewed-by: Jacky Bai <ping.bai@xxxxxxx>
Acked-by: Jason Liu <jason.hui.liu@xxxxxxx>
---
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