On 2/26/20 5:21 AM, Mika Westerberg wrote:
> The iTCO_wdt driver only needs ICH_RES_IO_SMI I/O resource when either
> turn_SMI_watchdog_clear_off module parameter is set to match ->iTCO_version
> (or higher), and when legacy iTCO_vendorsupport is set. Modify the driver
> so that ICH_RES_IO_SMI is optional if the two conditions are not met.
>
> Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
> drivers/watchdog/iTCO_wdt.c | 28 ++++++++++++++++------------
> 1 file changed, 16 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
> index 156360e37714..e707c4797f76 100644
> --- a/drivers/watchdog/iTCO_wdt.c
> +++ b/drivers/watchdog/iTCO_wdt.c
> @@ -459,13 +459,25 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
> if (!p->tco_res)
> return -ENODEV;
>
> - p->smi_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_SMI);
> - if (!p->smi_res)
> - return -ENODEV;
> -
> p->iTCO_version = pdata->version;
> p->pci_dev = to_pci_dev(dev->parent);
>
> + p->smi_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_SMI);
> + if (p->smi_res) {
> + /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
> + if (!devm_request_region(dev, p->smi_res->start,
> + resource_size(p->smi_res),
> + pdev->name)) {
> + pr_err("I/O address 0x%04llx already in use, device disabled\n",
> + (u64)SMI_EN(p));
> + return -EBUSY;
> + }
> + } else if (iTCO_vendorsupport ||
> + turn_SMI_watchdog_clear_off >= p->iTCO_version) {
> + pr_err("SMI I/O resource is missing\n");
> + return -ENODEV;
> + }
> +
> iTCO_wdt_no_reboot_bit_setup(p, pdata);
>
> /*
> @@ -492,14 +504,6 @@ static int iTCO_wdt_probe(struct platform_device *pdev)
> /* Set the NO_REBOOT bit to prevent later reboots, just for sure */
> p->update_no_reboot_bit(p->no_reboot_priv, true);
>
> - /* The TCO logic uses the TCO_EN bit in the SMI_EN register */
> - if (!devm_request_region(dev, p->smi_res->start,
> - resource_size(p->smi_res),
> - pdev->name)) {
> - pr_err("I/O address 0x%04llx already in use, device disabled\n",
> - (u64)SMI_EN(p));
> - return -EBUSY;
> - }
> if (turn_SMI_watchdog_clear_off >= p->iTCO_version) {
> /*
> * Bit 13: TCO_EN -> 0
>
