linux-kernel - [PATCH 1/2] spi: sprd: adi: Add missing lock protection when rebooting

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Date:   Mon, 28 Oct 2019 18:10:30 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     broonie@...nel.org
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com, baolin.wang@...aro.org,
        baolin.wang7@...il.com, ling_ling.xu@...soc.com,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] spi: sprd: adi: Add missing lock protection when rebooting

From: Lingling Xu <ling_ling.xu@...soc.com>

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@...soc.com>
Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 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 9a05128..9613cfe 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");
-- 
1.7.9.5