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ACPI / Documentation: update ACPI customize method feature docs

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Reviewed-by: Changzhong Li <changzhong.li@intel.com>
Reviewed-by: Rui Zhang <rui.zhang@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Erik Schmauss
2018-06-01 12:09:43 -07:00
committed by Rafael J. Wysocki
parent f4fe74cc90
commit fb145901e0
1 changed files with 5 additions and 5 deletions
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10
Documentation/acpi/method-customizing.txt
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@@ -16,7 +16,8 @@ control method rather than override the entire DSDT, because kernel
rebuild/reboot is not needed and test result can be got in minutes. rebuild/reboot is not needed and test result can be got in minutes.
Note: Only ACPI METHOD can be overridden, any other object types like Note: Only ACPI METHOD can be overridden, any other object types like
"Device", "OperationRegion", are not recognized. "Device", "OperationRegion", are not recognized. Methods
declared inside scope operators are also not supported.
Note: The same ACPI control method can be overridden for many times, Note: The same ACPI control method can be overridden for many times,
and it's always the latest one that used by Linux/kernel. and it's always the latest one that used by Linux/kernel.
Note: To get the ACPI debug object output (Store (AAAA, Debug)), Note: To get the ACPI debug object output (Store (AAAA, Debug)),
@@ -32,8 +33,6 @@ Note: To get the ACPI debug object output (Store (AAAA, Debug)),
DefinitionBlock ("", "SSDT", 1, "", "", 0x20080715) DefinitionBlock ("", "SSDT", 1, "", "", 0x20080715)
{ {
External (ACON)
Method (\_SB_.AC._PSR, 0, NotSerialized) Method (\_SB_.AC._PSR, 0, NotSerialized)
{ {
Store ("In AC _PSR", Debug) Store ("In AC _PSR", Debug)
@@ -42,9 +41,10 @@ Note: To get the ACPI debug object output (Store (AAAA, Debug)),
} }
Note that the full pathname of the method in ACPI namespace Note that the full pathname of the method in ACPI namespace
should be used. should be used.
And remember to use "External" to declare external objects.
e) assemble the file to generate the AML code of the method. e) assemble the file to generate the AML code of the method.
e.g. "iasl psr.asl" (psr.aml is generated as a result) e.g. "iasl -vw 6084 psr.asl" (psr.aml is generated as a result)
If parameter "-vw 6084" is not supported by your iASL compiler,
please try a newer version.
f) mount debugfs by "mount -t debugfs none /sys/kernel/debug" f) mount debugfs by "mount -t debugfs none /sys/kernel/debug"
g) override the old method via the debugfs by running g) override the old method via the debugfs by running
"cat /tmp/psr.aml > /sys/kernel/debug/acpi/custom_method" "cat /tmp/psr.aml > /sys/kernel/debug/acpi/custom_method"