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watchdog: imx7ulp_wdt: Check CMD32EN in wdog init

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When bootloader has enabled the CMD32EN bit, switch to use 32bits
unlock command to unlock the CS register. Using 32bits command will
help on avoiding 16 bus cycle window violation for two 16 bits
commands.

Signed-off-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Alice Guo <alice.guo@nxp.com>
Reviewed-by: Jacky Bai <ping.bai@nxp.com>
Acked-by: Jason Liu <jason.hui.liu@nxp.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220825083256.14565-4-alice.guo@oss.nxp.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Ye Li 2022-08-25 16:32:52 +08:00 • committed by Wim Van Sebroeck
parent 6371593fba
commit e809daec17
1 changed files with 10 additions and 5 deletions
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15
drivers/watchdog/imx7ulp_wdt.c
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@ -180,11 +180,16 @@ static int imx7ulp_wdt_init(void __iomem *base, unsigned int timeout)
local_irq_disable();
mb();
/* unlock the wdog for reconfiguration */
writel_relaxed(UNLOCK_SEQ0, base + WDOG_CNT);
writel_relaxed(UNLOCK_SEQ1, base + WDOG_CNT);
mb();
val = readl(base + WDOG_CS);
if (val & WDOG_CS_CMD32EN) {
writel(UNLOCK, base + WDOG_CNT);
} else {
mb();
/* unlock the wdog for reconfiguration */
writel_relaxed(UNLOCK_SEQ0, base + WDOG_CNT);
writel_relaxed(UNLOCK_SEQ1, base + WDOG_CNT);
mb();
}
ret = imx7ulp_wdt_wait(base, WDOG_CS_ULK);
if (ret)