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

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Message-ID: <8b748cc6-09c9-081c-c0c5-2e75f017b032@zhaoxin.com>
Date:   Wed, 22 Jun 2022 11:29:08 +0800
From:   Tony W Wang-oc <TonyWWang-oc@...oxin.com>
To:     <rafael@...nel.org>, <viresh.kumar@...aro.org>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <CobeChen@...oxin.com>, <TimGuo@...oxin.com>,
        <LindaChai@...oxin.com>, <LeoLiu@...oxin.com>
Subject: [PATCH] cpufreq: Add Zhaoxin turbo boost control interface support

Recent Zhaoxin 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 Zhaoxin 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