diff options
| author | Pu Wen <puwen@hygon.cn> | 2021-05-28 11:14:17 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-05-31 11:47:04 +0300 |
| commit | 280b68a3b3b96b027fcdeb5a3916a8e2aaf84d03 (patch) | |
| tree | f0551ee66c2e8d36b807f1547dc0ee40295f39bc /arch/x86/kernel/acpi/cstate.c | |
| parent | 2ade8fc65076095460e3ea1ca65a8f619d7d9a3a (diff) | |
| download | linux-280b68a3b3b96b027fcdeb5a3916a8e2aaf84d03.tar.xz | |
x86/cstate: Allow ACPI C1 FFH MWAIT use on Hygon systems
Hygon systems support the MONITOR/MWAIT instructions and these can be
used for ACPI C1 in the same way as on AMD and Intel systems.
The BIOS declares a C1 state in _CST to use FFH and CPUID_Fn00000005_EDX
is non-zero on Hygon systems.
Allow ffh_cstate_init() to succeed on Hygon systems to default using FFH
MWAIT instead of HALT for ACPI C1.
Signed-off-by: Pu Wen <puwen@hygon.cn>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210528081417.31474-1-puwen@hygon.cn
Diffstat (limited to 'arch/x86/kernel/acpi/cstate.c')
| -rw-r--r-- | arch/x86/kernel/acpi/cstate.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c index 49ae4e1ac9cd..7de599eba7f0 100644 --- a/arch/x86/kernel/acpi/cstate.c +++ b/arch/x86/kernel/acpi/cstate.c @@ -197,7 +197,8 @@ static int __init ffh_cstate_init(void) struct cpuinfo_x86 *c = &boot_cpu_data; if (c->x86_vendor != X86_VENDOR_INTEL && - c->x86_vendor != X86_VENDOR_AMD) + c->x86_vendor != X86_VENDOR_AMD && + c->x86_vendor != X86_VENDOR_HYGON) return -1; cpu_cstate_entry = alloc_percpu(struct cstate_entry); |