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LF-3211 watchdog: imx7ulp: Add explict memory barrier for unlock sequence 

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>
Reviewed-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 59ec9bb1baaad40175aac6da16e1b000e5d5ee70)
Signed-off-by: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
This commit is contained in:
Jacky Bai 2021-01-18 15:25:03 +08:00 committed by Andrey Zhizhikin
parent 817fc45854
commit b90cef338f
1 changed files with 4 additions and 0 deletions
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4
drivers/watchdog/imx7ulp_wdt.c
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@ -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;