linux-kernel - [PATCH 3/6] watchdog/hpwdt: Have core ping watchdog.

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Date:   Fri, 17 May 2019 14:59:40 -0600
From:   Jerry Hoemann <jerry.hoemann@....com>
To:     linux@...ck-us.net, wim@...ux-watchdog.org,
        linux-watchdog@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, mironov.ivan@...il.com,
        rasmus.villemoes@...vas.dk, jerry.hoemann@....com
Subject: [PATCH 3/6] watchdog/hpwdt: Have core ping watchdog.

Instead of stopping the hw timer during probe, have the core update
the timer if the timer is already running.

Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
---
 drivers/watchdog/hpwdt.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 9f7a370..aa4101c 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -59,6 +59,11 @@
 /*
  *	Watchdog operations
  */
+static int hpwdt_hw_is_running(void)
+{
+	return ioread8(hpwdt_timer_con) & 0x01;
+}
+
 static int hpwdt_start(struct watchdog_device *wdd)
 {
 	int control = 0x81 | (pretimeout ? 0x4 : 0);
@@ -302,8 +307,11 @@ static int hpwdt_init_one(struct pci_dev *dev,
 	hpwdt_timer_reg = pci_mem_addr + 0x70;
 	hpwdt_timer_con = pci_mem_addr + 0x72;
 
-	/* Make sure that timer is disabled until /dev/watchdog is opened */
-	hpwdt_stop();
+	/* Have the core update running timer until user space is ready */
+	if (hpwdt_hw_is_running()) {
+		dev_info(&dev->dev, "timer is running\n");
+		set_bit(WDOG_HW_RUNNING, &hpwdt_dev.status);
+	}
 
 	/* Initialize NMI Decoding functionality */
 	retval = hpwdt_init_nmi_decoding(dev);
-- 
1.8.3.1