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>

diff --git a/drivers/i2c/busses/i2c-i801.c b/drivers/i2c/busses/i2c-i801.c
index 5ef9b73..26298af 100644 (file)
--- a/drivers/i2c/busses/i2c-i801.c
+++ b/drivers/i2c/busses/i2c-i801.c
@@ -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;