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Revert "watchdog: iTCO_wdt: Account for rebooting on second timeout"

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This reverts commit cb011044e3 ("watchdog: iTCO_wdt: Account for
rebooting on second timeout") and commit aec42642d9 ("watchdog: iTCO_wdt:
Fix detection of SMI-off case") since those patches cause a regression
on certain boards (https://bugzilla.kernel.org/show_bug.cgi?id=213809).

While this revert may result in some boards to only reset after twice
the configured timeout value, that is still better than a watchdog reset
after half the configured value.

Fixes: cb011044e3 ("watchdog: iTCO_wdt: Account for rebooting on second timeout")
Fixes: aec42642d9 ("watchdog: iTCO_wdt: Fix detection of SMI-off case")
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Mantas Mikulėnas <grawity@gmail.com>
Reported-by: Javier S. Pedro <debbugs@javispedro.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20211008003302.1461733-1-linux@roeck-us.net
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Guenter Roeck 2021-10-07 17:33:02 -07:00 committed by Wim Van Sebroeck
parent 519d81956e
commit 6e7733ef0b
1 changed files with 3 additions and 9 deletions
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12
drivers/watchdog/iTCO_wdt.c
View file

@ -71,8 +71,6 @@
#define TCOBASE(p) ((p)->tco_res->start)
/* SMI Control and Enable Register */
#define SMI_EN(p) ((p)->smi_res->start)
#define TCO_EN (1 << 13)
#define GBL_SMI_EN (1 << 0)
#define TCO_RLD(p) (TCOBASE(p) + 0x00) /* TCO Timer Reload/Curr. Value */
#define TCOv1_TMR(p) (TCOBASE(p) + 0x01) /* TCOv1 Timer Initial Value*/
@ -357,12 +355,8 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
tmrval = seconds_to_ticks(p, t);
/*
* If TCO SMIs are off, the timer counts down twice before rebooting.
* Otherwise, the BIOS generally reboots when the SMI triggers.
*/
if (p->smi_res &&
(inl(SMI_EN(p)) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN))
/* For TCO v1 the timer counts down twice before rebooting */
if (p->iTCO_version == 1)
tmrval /= 2;
/* from the specs: */
@ -527,7 +521,7 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
* Disables TCO logic generating an SMI#
*/
val32 = inl(SMI_EN(p));
val32 &= ~TCO_EN; /* Turn off SMI clearing watchdog */
val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */
outl(val32, SMI_EN(p));
}