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17 May 2024, 09:02:56 UTC
Revision 18d78b64fddc11eb336f01e46ad3303a3f55d039 authored by Rafael J. Wysocki on 02 July 2015, 23:06:00 UTC, committed by Rafael J. Wysocki on 02 July 2015, 23:06:00 UTC 
ACPI / init: Make it possible to override _REV
 
The platform firmware on some systems expects Linux to return "5" as
the supported ACPI revision which makes it expose system configuration
information in a special way.

For example, based on what ACPI exports as the supported revision,
Dell XPS 13 (2015) configures its audio device to either work in HDA
mode or in I2S mode, where the former is supposed to be used on Linux
until the latter is fully supported (in the kernel as well as in user
space).

Since ACPI 6 mandates that _REV should return "2" if ACPI 2 or later
is supported by the OS, a subsequent change will make that happen, so
make it possible to override that on systems where "5" is expected to
be returned for Linux to work correctly one them (such as the Dell
machine mentioned above).

Original-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1 parent ce55d01
History
Tip revision: 18d78b64fddc11eb336f01e46ad3303a3f55d039 authored by Rafael J. Wysocki on 02 July 2015, 23:06:00 UTC
ACPI / init: Make it possible to override _REV
Tip revision: 18d78b6
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arch
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crypto
drivers
firmware
fs
include
init
ipc
kernel
lib
mm
net
samples
scripts
security
sound
tools
usr
virt
.gitignore -rw-r--r-- 1.2 KB
.mailmap -rw-r--r-- 4.9 KB
COPYING -rw-r--r-- 18.3 KB
CREDITS -rw-r--r-- 94.7 KB
Kbuild -rw-r--r-- 2.1 KB
Kconfig -rw-r--r-- 252 bytes
MAINTAINERS -rw-r--r-- 302.4 KB
Makefile -rw-r--r-- 53.1 KB
README -rw-r--r-- 18.2 KB
REPORTING-BUGS -rw-r--r-- 7.3 KB

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