On Tue, Sep 13, 2016 at 06:23:36PM +0300, Mika Westerberg wrote:
> 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 an ACPI WDAT
> table.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> drivers/platform/x86/intel_pmc_ipc.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
> index b86e1bcaa055..a511d518206b 100644
> --- a/drivers/platform/x86/intel_pmc_ipc.c
> +++ b/drivers/platform/x86/intel_pmc_ipc.c
> @@ -651,11 +651,15 @@ static int ipc_create_pmc_devices(void)
> {
> int ret;
>
> - ret = ipc_create_tco_device();
> - if (ret) {
> - dev_err(ipcdev.dev, "Failed to add tco platform device\n");
> - return ret;
> + /* If we have ACPI based watchdog use that instead */
> + if (!acpi_has_watchdog()) {
> + ret = ipc_create_tco_device();
> + if (ret) {
> + dev_err(ipcdev.dev, "Failed to add tco platform device\n");
> + return ret;
> + }
> }
> +
> ret = ipc_create_punit_device();
> if (ret) {
> dev_err(ipcdev.dev, "Failed to add punit platform device\n");
> --
> 2.9.3
>
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