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watchdog: sp5100_tco: Immediately trigger upon starting.

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The watchdog countdown is supposed to begin when the device file is
opened. Instead, it would begin countdown upon the first write to or
close of the device file. Now, the ping operation is called within the
start operation which ensures the countdown begins. From experimenation,
it does not appear possible to do this with a single write including
both the start bit and the trigger bit. So, it is done as two distinct
writes.

Signed-off-by: Gregory Oakes <gregory.oakes@amd.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20230316201312.17538-1-gregory.oakes@amd.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:
Gregory Oakes 2023-03-16 15:13:12 -05:00 committed by Wim Van Sebroeck
parent fe5631bb3a
commit 4eda19cc8a
1 changed files with 4 additions and 0 deletions
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4
drivers/watchdog/sp5100_tco.c
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@ -115,6 +115,10 @@ static int tco_timer_start(struct watchdog_device *wdd)
val |= SP5100_WDT_START_STOP_BIT;
writel(val, SP5100_WDT_CONTROL(tco->tcobase));
/* This must be a distinct write. */
val |= SP5100_WDT_TRIGGER_BIT;
writel(val, SP5100_WDT_CONTROL(tco->tcobase));
return 0;
}