[PATCH 2/7] watchdog: imx7ulp: Add explict memory barrier for unlock sequence
From: Alice Guo (OSS) <hidden>
Date: 2022-08-16 07:28:19
Also in:
linux-watchdog, lkml
Subsystem:
the rest, watchdog device drivers · Maintainers:
Linus Torvalds, Wim Van Sebroeck, Guenter Roeck
From: Jacky Bai <ping.bai@nxp.com> Add explict memory barrier for the wdog unlock sequence. Suggested-by: Ye Li <redacted> Signed-off-by: Jacky Bai <ping.bai@nxp.com> Signed-off-by: Alice Guo <redacted> Reviewed-by: Ye Li <redacted> --- 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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