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| author |   Yazen Ghannam <yazen.ghannam@amd.com> | 2017-06-07 10:19:46 -0500 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-06-27 02:00:52 +0200 |
| commit | 5209654a46ee71137ad9b06da99d4ef2794475af (patch) | |
| tree | 15f10af144d762cf767b23a9e78459b0b6ec7964 /drivers/idle | |
| parent | ARM: cpuidle: Support asymmetric idle definition (diff) | |
| download | linux-dev-5209654a46ee71137ad9b06da99d4ef2794475af.tar.xz linux-dev-5209654a46ee71137ad9b06da99d4ef2794475af.zip | |
x86/ACPI/cstate: Allow ACPI C1 FFH MWAIT use on AMD systems
AMD systems support the Monitor/Mwait instructions and these can be used
for ACPI C1 in the same way as on Intel systems.
Three things are needed:
1) This patch.
2) BIOS that declares a C1 state in _CST to use FFH, with correct values.
3) CPUID_Fn00000005_EDX is non-zero on the system.
The BIOS on AMD systems have historically not defined a C1 state in _CST,
so the acpi_idle driver uses HALT for ACPI C1.
Currently released systems have CPUID_Fn00000005_EDX as reserved/RAZ. If a
BIOS is released for these systems that requests a C1 state with FFH, the
FFH implementation in Linux will fail since CPUID_Fn00000005_EDX is 0. The
acpi_idle driver will then fallback to using HALT for ACPI C1.
Future systems are expected to have non-zero CPUID_Fn00000005_EDX and BIOS
support for using FFH for ACPI C1.
Allow ffh_cstate_init() to succeed on AMD systems.
Tested on Fam15h and Fam17h systems.
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/idle')
0 files changed, 0 insertions, 0 deletions