Messages in this thread | | | From | "Rafael J. Wysocki" <> | Date | Wed, 9 Jun 2021 19:30:45 +0200 | Subject | Re: [PATCH] x86/cstate: Allow ACPI C1 FFH MWAIT use on Hygon systems |
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On Fri, May 28, 2021 at 10:44 AM Pu Wen <puwen@hygon.cn> wrote: > > 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. > > Tested successfully on Hygon Fam18h systems. > > Signed-off-by: Pu Wen <puwen@hygon.cn> > --- > arch/x86/kernel/acpi/cstate.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > 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); > --
Applied as 5.14 material, thanks!
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