[PATCH v2] watchdog: make DesignWare watchdog allow users to set bigger timeout value
From: Wang, Peng 1. (NSB - CN/Hangzhou)
Date: Thu Nov 21 2019 - 05:35:20 EST
From aabaa4b709bd451e566c906e8d1dca48f92f9b12 Mon Sep 17 00:00:00 2001
From: Peng Wang <peng.1.wang@xxxxxxxxxxxxxxx>
Date: Wed, 20 Nov 2019 15:12:59 +0800
Subject: [PATCH] watchdog: make DesignWare watchdog allow users to set bigger
timeout value
watchdog_dev.c provides means to allow users to set bigger timeout value
than HW can support, make DesignWare watchdog align with this.
---
v2 -> v1:
- use top_s to compare with wdd->max_hw_heartbeat_ms
- update wdd->timeout in case it's greater than HW supports
- fix comments error
v1: initial version
Signed-off-by: Peng Wang <peng.1.wang@xxxxxxxxxxxxxxx>
---
drivers/watchdog/dw_wdt.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/watchdog/dw_wdt.c b/drivers/watchdog/dw_wdt.c
index fef7c61..12c116e 100644
--- a/drivers/watchdog/dw_wdt.c
+++ b/drivers/watchdog/dw_wdt.c
@@ -114,7 +114,15 @@ static int dw_wdt_set_timeout(struct watchdog_device *wdd, unsigned int top_s)
writel(top_val | top_val << WDOG_TIMEOUT_RANGE_TOPINIT_SHIFT,
dw_wdt->regs + WDOG_TIMEOUT_RANGE_REG_OFFSET);
- wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
+ /*
+ * In case users set bigger timeout value than HW can support,
+ * kernel(watchdog_dev.c) helps to feed watchdog before
+ * wdd->max_hw_heartbeat_ms
+ */
+ if ( top_s * 1000 <= wdd->max_hw_heartbeat_ms )
+ wdd->timeout = dw_wdt_top_in_seconds(dw_wdt, top_val);
+ else
+ wdd->timeout = top_s;
return 0;
}
--
1.8.3.1