path: root/drivers/acpi
diff options
authorZhao Yakui <yakui.zhao@intel.com>2008-10-06 10:31:36 +0800
committerLen Brown <len.brown@intel.com>2008-10-11 02:00:02 -0400
commit455c8793d2c49eaecad038c8de83dade9fc3759f (patch)
tree013a0d81561fff4198e15743ad65c26ac34d56ac /drivers/acpi
parent8463200a00fe2aea938b40173198a0983f2929ef (diff)
ACPI: Enable EC device immediately after ACPI full initialization
when there is no ECDT table and no _INI object for EC device, it will be enabled before scanning ACPI device. But it is too late after the following the commit is merged. >commit 7752d5cfe3d11ca0bb9c673ec38bd78ba6578f8e > Author: Robert Hancock <hancockr@shaw.ca> > Date: Fri Feb 15 01:27:20 2008 -0800 >x86: validate against acpi motherboard resources After the above commit is merged, OS will check whether MCFG area is reserved in ACPI motherboard resources by calling the function of acpi_get_devices when there exists MCFG table. In the acpi_get_devices the _STA object will be evaluated to check the status of the ACPI device. On some broken BIOS the MYEC object of EC device is initialized as one, which indicates that EC operation region is already accessible before enabling EC device.So on these broken BIOS the EC operation region will be accessed in course of evaluating the _STA object before enabling EC device, which causes that OS will print the following warning messages: >ACPI Error (evregion-0315): No handler for Region [EC__] (ffff88007f8145e8) [EmbeddedControl] [20080609] >ACPI Error (exfldio-0290): Region EmbeddedControl(3) has no handler [20080321] >ACPI Error (psparse-0530): Method parse/execution failed [\_SB_.PCI0.SBRG. EC__.BAT1._STA] (Node ffff81013fc17a00), AE_NOT_EXIST >ACPI Error (uteval-0233): Method execution failed [\_SB_.PCI0.SBRG.EC__.BAT1. _STA] (Node ffff81013fc17a00), AE_NOT_EXIST Although the above warning message is harmless, it looks confusing. So it is necessary to enable EC device as early as possible.Maybe it is appropriate to enable it immediately after ACPI full initialization. http://bugzilla.kernel.org/show_bug.cgi?id=11255 http://bugzilla.kernel.org/show_bug.cgi?id=11374 http://bugzilla.kernel.org/show_bug.cgi?id=11660 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Alexey Starikovskiy <astarikovskiy@suse.de> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
2 files changed, 6 insertions, 4 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index ccae305ee55..0e0bbc6209e 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -749,6 +749,12 @@ static int __init acpi_bus_init(void)
goto error1;
+ /*
+ * Maybe EC region is required at bus_scan/acpi_get_devices. So it
+ * is necessary to enable it as early as possible.
+ */
+ acpi_boot_ec_enable();
printk(KERN_INFO PREFIX "Interpreter enabled\n");
/* Initialize sleep structures */
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index f6f52c1a2ab..2ae218f5ea5 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1545,7 +1545,6 @@ static int acpi_bus_scan_fixed(struct acpi_device *root)
return result;
-int __init acpi_boot_ec_enable(void);
static int __init acpi_scan_init(void)
@@ -1579,9 +1578,6 @@ static int __init acpi_scan_init(void)
result = acpi_bus_scan_fixed(acpi_root);
- /* EC region might be needed at bus_scan, so enable it now */
- acpi_boot_ec_enable();
if (!result)
result = acpi_bus_scan(acpi_root, &ops);