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watchdog: imx7ulp: Watchdog should continue running for wait/stop mode 

When kernel idle, system will enter wait/stop mode, wdog should continue
running in this scenario, and the refresh thread can wake up system from
wait/stop mode.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/1596150213-31638-2-git-send-email-Anson.Huang@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:
Anson Huang 2020-07-31 07:03:33 +08:00 committed by Wim Van Sebroeck
parent d342951bcd
commit 0cfbe17959
1 changed files with 4 additions and 1 deletions
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5
drivers/watchdog/imx7ulp_wdt.c
View File

@ -22,6 +22,8 @@
#define WDOG_CS_CLK (LPO_CLK << LPO_CLK_SHIFT)
#define WDOG_CS_EN BIT(7)
#define WDOG_CS_UPDATE BIT(5)
#define WDOG_CS_WAIT BIT(1)
#define WDOG_CS_STOP BIT(0)
#define WDOG_CNT 0x4
#define WDOG_TOVAL 0x8
@ -187,7 +189,8 @@ static int imx7ulp_wdt_init(void __iomem *base, unsigned int timeout)
/* set an initial timeout value in TOVAL */
writel(timeout, base + WDOG_TOVAL);
/* enable 32bit command sequence and reconfigure */
val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE;
val = WDOG_CS_CMD32EN | WDOG_CS_CLK | WDOG_CS_UPDATE |
WDOG_CS_WAIT | WDOG_CS_STOP;
writel(val, base + WDOG_CS);
imx7ulp_wdt_wait(base, WDOG_CS_RCS);