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spi: sprd: adi: Add missing lock protection when rebooting 

[ Upstream commit 91ea1d7060 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
5.4-rM2-2.2.x-imx-squashed
Lingling Xu 2019-10-28 18:10:30 +08:00 committed by Greg Kroah-Hartman
parent 39303579eb
commit 60e315db41
1 changed files with 3 additions and 0 deletions
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3
drivers/spi/spi-sprd-adi.c
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@ -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");