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Subject[PATCH 2/7] watchdog: imx7ulp: Add explict memory barrier for unlock sequence
Date
From: Jacky Bai <ping.bai@nxp.com>

Add explict memory barrier for the wdog unlock sequence.

Suggested-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Signed-off-by: Alice Guo <alice.guo@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
---
drivers/watchdog/imx7ulp_wdt.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/watchdog/imx7ulp_wdt.c b/drivers/watchdog/imx7ulp_wdt.c
index 014f497ea0dc..b8ac0cb04d2f 100644
--- a/drivers/watchdog/imx7ulp_wdt.c
+++ b/drivers/watchdog/imx7ulp_wdt.c
@@ -179,9 +179,13 @@ static int imx7ulp_wdt_init(void __iomem *base, unsigned int timeout)
int ret;

local_irq_disable();
+
+ mb();
/* unlock the wdog for reconfiguration */
writel_relaxed(UNLOCK_SEQ0, base + WDOG_CNT);
writel_relaxed(UNLOCK_SEQ1, base + WDOG_CNT);
+ mb();
+
ret = imx7ulp_wdt_wait(base, WDOG_CS_ULK);
if (ret)
goto init_out;
--
2.17.1
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