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authorLingling Xu <ling_ling.xu@unisoc.com>2019-10-28 18:10:31 +0800
committerMark Brown <broonie@kernel.org>2019-10-28 13:17:10 +0000
commit1d00a67c2da2d8d82e6dcc5b398d9f6db656d9be (patch)
treeae600d5ba315c1bd4c793dd783f697e6849cb49d /drivers/spi
parent91ea1d70607e374b014b4b9bea771ce661f9f64b (diff)
downloadlinux-1d00a67c2da2d8d82e6dcc5b398d9f6db656d9be.tar.bz2
spi: sprd: adi: Set BIT_WDG_NEW bit when rebooting
When rebooting system, the PMIC watchdog time loading may not be loaded correctly when another system is feeding the PMIC watchdog, since we did not check the watchdog busy status before loading time values. Thus we should set the BIT_WDG_NEW bit before loading time values, that can support multiple loads without checking busy status to make sure the time values can be loaded successfully to avoid this potential issue. 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/5655318a7252c9ea518c2f7950a61228ab8f42bf.1572257085.git.baolin.wang@linaro.org Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-sprd-adi.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/spi/spi-sprd-adi.c b/drivers/spi/spi-sprd-adi.c
index 9613cfe3c0a2..87dadb6b8ebf 100644
--- a/drivers/spi/spi-sprd-adi.c
+++ b/drivers/spi/spi-sprd-adi.c
@@ -77,6 +77,7 @@
/* Bits definitions for register REG_WDG_CTRL */
#define BIT_WDG_RUN BIT(1)
+#define BIT_WDG_NEW BIT(2)
#define BIT_WDG_RST BIT(3)
/* Registers definitions for PMIC */
@@ -383,6 +384,10 @@ static int sprd_adi_restart_handler(struct notifier_block *this,
/* Unlock the watchdog */
sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOCK, WDG_UNLOCK_KEY);
+ sprd_adi_read(sadi, sadi->slave_pbase + REG_WDG_CTRL, &val);
+ val |= BIT_WDG_NEW;
+ sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_CTRL, val);
+
/* Load the watchdog timeout value, 50ms is always enough. */
sprd_adi_write(sadi, sadi->slave_pbase + REG_WDG_LOAD_LOW,
WDG_LOAD_VAL & WDG_LOAD_MASK);