linux-kernel - [PATCH] cpufreq: intel_pstate: Add Tigerlake support in no-HWP mode

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Message-ID: <003c01d8c22f$4a8e2270$dfaa6750$@telus.net>
Date:   Tue, 6 Sep 2022 13:28:57 -0700
From:   "Doug Smythies" <dsmythies@...us.net>
To:     "'srinivas pandruvada'" <srinivas.pandruvada@...ux.intel.com>,
        <lenb@...nel.org>, "'Rafael J. Wysocki'" <rafael@...nel.org>
Cc:     <linux-pm@...r.kernel.org>,
        "'LKML'" <linux-kernel@...r.kernel.org>,
        "Doug Smythies" <dsmythies@...us.net>,
        "'M. Cagri Ari'" <cagriari@...me>
Subject: [PATCH] cpufreq: intel_pstate: Add Tigerlake support in no-HWP mode

Users may disable HWP in firmware, in which case intel_pstate wouldn't load
unless the CPU model is explicitly supported.

Add TIGERLAKE to the list of CPUs that can register intel_pstate while not
advertising the HWP capability. Without this change, an TIGERLAKE in no-HWP
mode could only use the acpi_cpufreq frequency scaling driver.

See also commits:
d8de7a44e11f: cpufreq: intel_pstate: Add Skylake servers support
fbdc21e9b038: cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode
706c5328851d: cpufreq: intel_pstate: Add Cometlake support in no-HWP mode

Reported by: M. Cargi Ari <cagriari@...me>
Signed-off-by: Doug Smythies <dsmythies@...us.net>
---
 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 57cdb3679885..fc3ebeb0bbe5 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2416,6 +2416,7 @@ static const struct x86_cpu_id intel_pstate_cpu_ids[] = {
 	X86_MATCH(SKYLAKE_X,		core_funcs),
 	X86_MATCH(COMETLAKE,		core_funcs),
 	X86_MATCH(ICELAKE_X,		core_funcs),
+	X86_MATCH(TIGERLAKE,		core_funcs),
 	{}
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids);
--
2.25.1