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watchdog: sprd: check busy bit before new loading rather than after that

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[ Upstream commit 3e07d24093 ]

As the specification described, users must check busy bit before start
a new loading operation to make sure that the previous loading is done
and the device is ready to accept a new one.

[ chunyan: Massaged changelog ]

Fixes: 4776034670 ("watchdog: Add Spreadtrum watchdog driver")
Signed-off-by: Lingling Xu <ling_ling.xu@unisoc.com>
Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20201029023933.24548-3-zhang.lyra@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lingling Xu 2020-11-09 11:00:54 +08:00 committed by Greg Kroah-Hartman
parent 5e62f759cd
commit e65c61ad99
1 changed files with 13 additions and 12 deletions
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25
drivers/watchdog/sprd_wdt.c
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@ -116,18 +116,6 @@ static int sprd_wdt_load_value(struct sprd_wdt *wdt, u32 timeout,
u32 tmr_step = timeout * SPRD_WDT_CNT_STEP;
u32 prtmr_step = pretimeout * SPRD_WDT_CNT_STEP;
sprd_wdt_unlock(wdt->base);
writel_relaxed((tmr_step >> SPRD_WDT_CNT_HIGH_SHIFT) &
SPRD_WDT_LOW_VALUE_MASK, wdt->base + SPRD_WDT_LOAD_HIGH);
writel_relaxed((tmr_step & SPRD_WDT_LOW_VALUE_MASK),
wdt->base + SPRD_WDT_LOAD_LOW);
writel_relaxed((prtmr_step >> SPRD_WDT_CNT_HIGH_SHIFT) &
SPRD_WDT_LOW_VALUE_MASK,
wdt->base + SPRD_WDT_IRQ_LOAD_HIGH);
writel_relaxed(prtmr_step & SPRD_WDT_LOW_VALUE_MASK,
wdt->base + SPRD_WDT_IRQ_LOAD_LOW);
sprd_wdt_lock(wdt->base);
/*
* Waiting the load value operation done,
* it needs two or three RTC clock cycles.
@ -142,6 +130,19 @@ static int sprd_wdt_load_value(struct sprd_wdt *wdt, u32 timeout,
if (delay_cnt >= SPRD_WDT_LOAD_TIMEOUT)
return -EBUSY;
sprd_wdt_unlock(wdt->base);
writel_relaxed((tmr_step >> SPRD_WDT_CNT_HIGH_SHIFT) &
SPRD_WDT_LOW_VALUE_MASK, wdt->base + SPRD_WDT_LOAD_HIGH);
writel_relaxed((tmr_step & SPRD_WDT_LOW_VALUE_MASK),
wdt->base + SPRD_WDT_LOAD_LOW);
writel_relaxed((prtmr_step >> SPRD_WDT_CNT_HIGH_SHIFT) &
SPRD_WDT_LOW_VALUE_MASK,
wdt->base + SPRD_WDT_IRQ_LOAD_HIGH);
writel_relaxed(prtmr_step & SPRD_WDT_LOW_VALUE_MASK,
wdt->base + SPRD_WDT_IRQ_LOAD_LOW);
sprd_wdt_lock(wdt->base);
return 0;
}