From: Greg Kroah-Hartman gregkh@linuxfoundation.org
This reverts commit f58ab0b02ee7b095e0cae4ba706caa86fff5557b which is commit cb011044e34c293e139570ce5c01aed66a34345c upstream.
It is reported to cause problems with systems and probably should not have been backported in the first place :(
Link: https://lore.kernel.org/r/20210803165108.4154cd52@endymion Reported-by: Jean Delvare jdelvare@suse.de Cc: Jan Kiszka jan.kiszka@siemens.com Cc: Guenter Roeck linux@roeck-us.net Cc: Guenter Roeck linux@roeck-us.net Cc: Wim Van Sebroeck wim@linux-watchdog.org Cc: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/watchdog/iTCO_wdt.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-)
--- a/drivers/watchdog/iTCO_wdt.c +++ b/drivers/watchdog/iTCO_wdt.c @@ -72,8 +72,6 @@ #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*/ @@ -346,12 +344,8 @@ static int iTCO_wdt_set_timeout(struct w
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 && - (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: */ @@ -516,7 +510,7 @@ static int iTCO_wdt_probe(struct platfor * 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)); }