Commit eb7f43c4 authored Aug 10, 2017 by Rafael J. Wysocki

ACPI / scan: Enable GPEs before scanning the namespace



On some systems the platform firmware expects GPEs to be enabled
before the enumeration of devices and if that expectation is not
met, the systems in question may not boot in some situations.

For this reason, change the initialization ordering of the ACPI
subsystem to make it enable GPEs before scanning the namespace
for the first time in order to enumerate devices.

Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Lv Zheng <lv.zheng@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@linux.intel.com>

parent 1312b7e0

drivers/acpi/scan.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -2058,6 +2058,9 @@ int __init acpi_scan_init(void)
		acpi_get_spcr_uart_addr();
		}

		acpi_gpe_apply_masked_gpes();
		acpi_update_all_gpes();

		mutex_lock(&acpi_scan_lock);
		/*
		* Enumerate devices in the ACPI namespace.
		@@ -2082,9 +2085,6 @@ int __init acpi_scan_init(void)
		}
		}

		acpi_gpe_apply_masked_gpes();
		acpi_update_all_gpes();

		acpi_scan_initialized = true;

		out:

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