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i2c: i801: Do not create iTCO watchdog when WDAT table exists 

ACPI WDAT table is the preferred way to use hardware watchdog over the
native iTCO_wdt. Windows only uses this table for its hardware watchdog
implementation so we should be relatively safe to trust it has been
validated by OEMs

Prevent iTCO watchdog creation if we detect that there is ACPI WDAT table.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2016-09-20 15:30:53 +03:00 committed by Rafael J. Wysocki
parent 3413f702fa
commit 1f6dbb022b
1 changed files with 3 additions and 1 deletions
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4
drivers/i2c/busses/i2c-i801.c
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@ -1486,7 +1486,9 @@ static int i801_probe(struct pci_dev *dev, const struct pci_device_id *id)
priv->features |= FEATURE_IRQ;
priv->features |= FEATURE_SMBUS_PEC;
priv->features |= FEATURE_BLOCK_BUFFER;
priv->features |= FEATURE_TCO;
/* If we have ACPI based watchdog use that instead */
if (!acpi_has_watchdog())
priv->features |= FEATURE_TCO;
priv->features |= FEATURE_HOST_NOTIFY;
break;