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mfd: lpc_ich: 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: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mika Westerberg 2016-09-20 15:30:52 +03:00 committed by Rafael J. Wysocki
parent 058dfc7670
commit 3413f702fa
1 changed files with 4 additions and 0 deletions
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4
drivers/mfd/lpc_ich.c
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@ -984,6 +984,10 @@ static int lpc_ich_init_wdt(struct pci_dev *dev)
int ret; int ret;
struct resource *res; struct resource *res;
/* If we have ACPI based watchdog use that instead */
if (acpi_has_watchdog())
return -ENODEV;
/* Setup power management base register */ /* Setup power management base register */
pci_read_config_dword(dev, priv->abase, &base_addr_cfg); pci_read_config_dword(dev, priv->abase, &base_addr_cfg);
base_addr = base_addr_cfg & 0x0000ff80; base_addr = base_addr_cfg & 0x0000ff80;