From 91ea1d70607e374b014b4b9bea771ce661f9f64b Mon Sep 17 00:00:00 2001
From: Lingling Xu <ling_ling.xu@unisoc.com>
Date: Mon, 28 Oct 2019 18:10:30 +0800
Subject: [PATCH] spi: sprd: adi: Add missing lock protection when rebooting
Git-commit: 91ea1d70607e374b014b4b9bea771ce661f9f64b
Patch-mainline: v5.5-rc1
References: git-fixes
When rebooting the system, we should lock the watchdog after
configuration to make sure the watchdog can reboot the system
successfully.
Signed-off-by: Lingling Xu <ling_ling.xu@unisoc.com>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Link: https://lore.kernel.org/r/7b04711127434555e3a1a86bc6be99860cd86668.1572257085.git.baolin.wang@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/spi/spi-sprd-adi.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/spi/spi-sprd-adi.c b/drivers/spi/spi-sprd-adi.c
index 9a051286f120..9613cfe3c0a2 100644
--- a/drivers/spi/spi-sprd-adi.c
+++ b/drivers/spi/spi-sprd-adi.c
@@ -393,6 +393,9 @@ static int sprd_adi_restart_handler(struct notifier_block *this,
val |= BIT_WDG_RUN | BIT_WDG_RST;
sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val);
+ /* Lock the watchdog */
+ sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, ~WDG_UNLOCK_KEY);
+
mdelay(1000);
dev_emerg(sadi->dev, "Unable to restart system\n");
--
2.16.4