From: Perry Yuan <perry.yuan@amd.com>
To: <rafael.j.wysocki@intel.com>, <Mario.Limonciello@amd.com>,
<viresh.kumar@linaro.org>, <Ray.Huang@amd.com>,
<gautham.shenoy@amd.com>, <Borislav.Petkov@amd.com>
Cc: <Alexander.Deucher@amd.com>, <Xinmei.Huang@amd.com>,
<Xiaojian.Du@amd.com>, <Li.Meng@amd.com>,
<linux-pm@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH 1/6] ACPI: CPPC: enable AMD CPPC V2 support for family 17h processors
Date: Wed, 31 Jan 2024 16:50:16 +0800 [thread overview]
Message-ID: <3a2a5bb22f9ec853cc8762fa1795a75fa1106f22.1706690577.git.perry.yuan@amd.com> (raw)
In-Reply-To: <cover.1706690577.git.perry.yuan@amd.com>
As there are some AMD processors which only support CPPC V2 firmware and
BIOS implementation, the amd_pstate driver will be failed to load when
system booting with below kernel warning message:
[ 0.477523] amd_pstate: the _CPC object is not present in SBIOS or ACPI disabled
To make the amd_pstate driver can be loaded on those TR40 processors, it
needs to match x86_model from 0x30 to 0x7F for family 17H.
With the change, the system can load amd_pstate driver as expected.
Reported-by: Gino Badouri <badouri.g@gmail.com>
Issue: https://bugzilla.kernel.org/show_bug.cgi?id=218171
Fixes: fbd74d1689 ("ACPI: CPPC: Fix enabling CPPC on AMD systems with shared memory")
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
---
arch/x86/kernel/acpi/cppc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/acpi/cppc.c b/arch/x86/kernel/acpi/cppc.c
index 8d8752b44f11..ff8f25faca3d 100644
--- a/arch/x86/kernel/acpi/cppc.c
+++ b/arch/x86/kernel/acpi/cppc.c
@@ -20,7 +20,7 @@ bool cpc_supported_by_cpu(void)
(boot_cpu_data.x86_model >= 0x20 && boot_cpu_data.x86_model <= 0x2f)))
return true;
else if (boot_cpu_data.x86 == 0x17 &&
- boot_cpu_data.x86_model >= 0x70 && boot_cpu_data.x86_model <= 0x7f)
+ boot_cpu_data.x86_model >= 0x30 && boot_cpu_data.x86_model <= 0x7f)
return true;
return boot_cpu_has(X86_FEATURE_CPPC);
}
--
2.34.1
next prev parent reply other threads:[~2024-01-31 8:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-31 8:50 [PATCH 0/6] AMD Pstate Fixes And Enhancements Perry Yuan
2024-01-31 8:50 ` Perry Yuan [this message]
2024-01-31 21:45 ` [PATCH 1/6] ACPI: CPPC: enable AMD CPPC V2 support for family 17h processors Mario Limonciello
2024-01-31 8:50 ` [PATCH 2/6] cpufreq:amd-pstate: fix the nominal freq value set Perry Yuan
2024-01-31 21:46 ` Mario Limonciello
2024-01-31 8:50 ` [PATCH 3/6] cpufreq:amd-pstate: initialize nominal_freq of each cpudata Perry Yuan
2024-01-31 21:47 ` Mario Limonciello
2024-01-31 8:50 ` [PATCH 4/6] cpufreq:amd-pstate: get pstate transition delay and latency value from ACPI tables Perry Yuan
2024-01-31 21:49 ` Mario Limonciello
2024-01-31 8:50 ` [PATCH 5/6] cppc_acpi: print error message if CPPC is unsupported Perry Yuan
2024-01-31 21:51 ` Mario Limonciello
2024-01-31 8:50 ` [PATCH 6/6] cpufreq:amd-pstate: add quirk for the pstate CPPC capabilities missing Perry Yuan
2024-01-31 21:59 ` Mario Limonciello
2024-02-02 9:05 ` Yuan, Perry
2024-01-31 11:36 ` [PATCH 0/6] AMD Pstate Fixes And Enhancements Tor Vic
2024-02-02 9:12 ` Yuan, Perry
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