[PATCH V1] x86/cstate: Add Zhaoxin/Centaur ACPI Cx FFH MWAIT support

[Tony W Wang-oc]

Recent Zhaoxin/Centaur CPUs support X86_FEATURE_MWAIT that implies
the MONITOR/MWAIT instructions can be used for ACPI Cx state.
The BIOS declares Cx state in _CST object to use FFH on Zhaoxin/Centaur
systems. So let function ffh_cstate_init() support These CPUs too.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@xxxxxxxxxxx>
---
 arch/x86/kernel/acpi/cstate.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
index 7945eae..d4185e1 100644
--- a/arch/x86/kernel/acpi/cstate.c
+++ b/arch/x86/kernel/acpi/cstate.c
@@ -213,7 +213,9 @@ static int __init ffh_cstate_init(void)

 	if (c->x86_vendor != X86_VENDOR_INTEL &&
 	    c->x86_vendor != X86_VENDOR_AMD &&
-	    c->x86_vendor != X86_VENDOR_HYGON)
+	    c->x86_vendor != X86_VENDOR_HYGON &&
+	    c->x86_vendor != X86_VENDOR_CENTAUR &&
+	    c->x86_vendor != X86_VENDOR_ZHAOXIN)
 		return -1;

 	cpu_cstate_entry = alloc_percpu(struct cstate_entry);
--
2.7.4