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Commit 2a2a6471 authored by Zhao Yakui's avatar Zhao Yakui Committed by Andi Kleen
Browse files

ACPI: Disable MWAIT via DMI on broken Compal board 

If a system matches in this DMI table,
Linux will disable MWAIT support for idle.
ie. "idle=nomwait" is automatically invoked
and C1_FFH and C2C3_FFH access mode are disabled.

http://bugzilla.kernel.org/show_bug.cgi?id=10807
http://bugzilla.kernel.org/show_bug.cgi?id=10914



Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarLi Shaohua <shaohua.li@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent da5e09a1

drivers/acpi/processor_core.c

+28 −0
Original line number Diff line number Diff line
@@ -120,6 +120,29 @@ static const struct file_operations acpi_processor_info_fops = { 


DEFINE_PER_CPU(struct acpi_processor *, processors);

struct acpi_processor_errata errata __read_mostly;

static int set_no_mwait(const struct dmi_system_id *id)

{

	printk(KERN_NOTICE PREFIX "%s detected - "

		"disable mwait for CPU C-stetes\n", id->ident);

	idle_nomwait = 1;

	return 0;

}



static struct dmi_system_id __cpuinitdata processor_idle_dmi_table[] = {

	{

	set_no_mwait, "IFL91 board", {

	DMI_MATCH(DMI_BIOS_VENDOR, "COMPAL"),

	DMI_MATCH(DMI_SYS_VENDOR, "ZEPTO"),

	DMI_MATCH(DMI_PRODUCT_VERSION, "3215W"),

	DMI_MATCH(DMI_BOARD_NAME, "IFL91") }, NULL},

	{

	set_no_mwait, "Extensa 5220", {

	DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),

	DMI_MATCH(DMI_SYS_VENDOR, "ACER"),

	DMI_MATCH(DMI_PRODUCT_VERSION, "0100"),

	DMI_MATCH(DMI_BOARD_NAME, "Columbia") }, NULL},

	{},

};



/* --------------------------------------------------------------------------

                                Errata Handling
@@ -1100,6 +1123,11 @@ static int __init acpi_processor_init(void) 
		return -ENOMEM;

	acpi_processor_dir->owner = THIS_MODULE;



	/*

	 * Check whether the system is DMI table. If yes, OSPM

	 * should not use mwait for CPU-states.

	 */

	dmi_check_system(processor_idle_dmi_table);

	result = cpuidle_register_driver(&acpi_idle_driver);

	if (result < 0)

		goto out_proc;