linux-kernel - [PATCH 5.15 125/179] cpufreq: intel_pstate: Add Ice Lake server to out-of-band IDs

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Date:   Mon, 29 Nov 2021 19:18:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adamos Ttofari <attofari@...zon.de>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 125/179] cpufreq: intel_pstate: Add Ice Lake server to out-of-band IDs

From: Adamos Ttofari <attofari@...zon.de>

[ Upstream commit cd23f02f166892603eb9f2d488152b975872b682 ]

Commit fbdc21e9b038 ("cpufreq: intel_pstate: Add Icelake servers
support in no-HWP mode") enabled the use of Intel P-State driver
for Ice Lake servers.

But it doesn't cover the case when OS can't control P-States.

Therefore, for Ice Lake server, if MSR_MISC_PWR_MGMT bits 8 or 18
are enabled, then the Intel P-State driver should exit as OS can't
control P-States.

Fixes: fbdc21e9b038 ("cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode")
Signed-off-by: Adamos Ttofari <attofari@...zon.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/cpufreq/intel_pstate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 3e56a4a1d1d3a..e15c3bc17a55c 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2255,6 +2255,7 @@ static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
 	X86_MATCH(BROADWELL_D,		core_funcs),
 	X86_MATCH(BROADWELL_X,		core_funcs),
 	X86_MATCH(SKYLAKE_X,		core_funcs),
+	X86_MATCH(ICELAKE_X,		core_funcs),
 	{}
 };
 
-- 
2.33.0