Commit e1681599 authored by Hans de Goede's avatar Hans de Goede Committed by Rafael J. Wysocki
Browse files

ACPI / LPSS: Do not instiate platform_dev for devs without MMIO resources



acpi_lpss_create_device() skips handling LPSS devices which do not have
a mmio resources in their resource list (typically these devices are
disabled by the firmware). But since the LPSS code does not bind to the
device, acpi_bus_attach() ends up still creating a platform device for
it and the regular platform_driver for the ACPI HID still tries to bind
to it.

This happens e.g. on some boards which do not use the pwm-controller
and have an empty or invalid resource-table for it. Currently this causes
these error messages to get logged:

[    3.281966] pwm-lpss 80862288:00: invalid resource
[    3.287098] pwm-lpss: probe of 80862288:00 failed with error -22

This commit stops the undesirable creation of a platform_device for
disabled LPSS devices by setting pnp.type.platform_id to 0. Note that
acpi_scan_attach_handler() also sets pnp.type.platform_id to 0 when there
is a matching handler for the device and that handler has no attach
callback, so we simply behave as a handler without an attach function
in this case.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Acked-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e6ce0ce3
Loading
Loading
Loading
Loading
+2 −0
Original line number Diff line number Diff line
@@ -601,6 +601,8 @@ static int acpi_lpss_create_device(struct acpi_device *adev,
	acpi_dev_free_resource_list(&resource_list);

	if (!pdata->mmio_base) {
		/* Avoid acpi_bus_attach() instantiating a pdev for this dev. */
		adev->pnp.type.platform_id = 0;
		/* Skip the device, but continue the namespace scan. */
		ret = 0;
		goto err_out;