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[v2,2/2] watchdog: apple: Increase reset delay to 150ms

Message ID 20241001170018.20139-3-towinchenmi@gmail.com
State New
Headers show
Series watchdog: apple: Increase reset delay to 150ms | expand

Commit Message

Nick Chan Oct. 1, 2024, 4:59 p.m. UTC 
The Apple A8X SoC seems to be slowest at resetting, taking up to around
125ms to reset. Wait 150ms to be safe here.

Reviewed-by: Sven Peter <sven@svenpeter.dev>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Nick Chan <towinchenmi@gmail.com>
---
 drivers/watchdog/apple_wdt.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
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Patch

diff --git a/drivers/watchdog/apple_wdt.c b/drivers/watchdog/apple_wdt.c
index 62dabf223d90..95d9e37df41c 100644
--- a/drivers/watchdog/apple_wdt.c
+++ b/drivers/watchdog/apple_wdt.c
@@ -127,11 +127,11 @@  static int apple_wdt_restart(struct watchdog_device *wdd, unsigned long mode,
 	/*
 	 * Flush writes and then wait for the SoC to reset. Even though the
 	 * reset is queued almost immediately experiments have shown that it
-	 * can take up to ~20-25ms until the SoC is actually reset. Just wait
-	 * 50ms here to be safe.
+	 * can take up to ~120-125ms until the SoC is actually reset. Just
+	 * wait 150ms here to be safe.
 	 */
 	(void)readl(wdt->regs + APPLE_WDT_WD1_CUR_TIME);
-	mdelay(50);
+	mdelay(150);
 
 	return 0;
 }