linux-kernel - [PATCH V2] cpufreq: Add Zhaoxin/Centaur turbo boost control interface support

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Message-ID: <c4f669a8-0da6-862a-0450-ddf178272bdd@zhaoxin.com>
Date:   Thu, 23 Jun 2022 09:21:26 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
        <CobeChen@...oxin.com>, <TimGuo@...oxin.com>,
        <LindaChai@...oxin.com>, <LeoLiu@...oxin.com>,
        "ACPI Devel Maling List" <linux-acpi@...r.kernel.org>
Subject: [PATCH V2] cpufreq: Add Zhaoxin/Centaur turbo boost control interface
 support

Recent Zhaoxin/Centaur CPUs support X86_FEATURE_IDA and the turbo boost
can be dynamically enabled or disabled through MSR 0x1a0[38] in the same
way as Intel. So add turbo boost control support for these CPUs too.

Signed-off-by: Tony W Wang-oc <TonyWWang-oc@...oxin.com>
---
  drivers/cpufreq/acpi-cpufreq.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 3d514b8..1bb2b90 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -78,6 +78,8 @@ static bool boost_state(unsigned int cpu)

  	switch (boot_cpu_data.x86_vendor) {
  	case X86_VENDOR_INTEL:
+	case X86_VENDOR_CENTAUR:
+	case X86_VENDOR_ZHAOXIN:
  		rdmsr_on_cpu(cpu, MSR_IA32_MISC_ENABLE, &lo, &hi);
  		msr = lo | ((u64)hi << 32);
  		return !(msr & MSR_IA32_MISC_ENABLE_TURBO_DISABLE);
@@ -97,6 +99,8 @@ static int boost_set_msr(bool enable)

  	switch (boot_cpu_data.x86_vendor) {
  	case X86_VENDOR_INTEL:
+	case X86_VENDOR_CENTAUR:
+	case X86_VENDOR_ZHAOXIN:
  		msr_addr = MSR_IA32_MISC_ENABLE;
  		msr_mask = MSR_IA32_MISC_ENABLE_TURBO_DISABLE;
  		break;
-- 
2.7.4