From: Wei Huang <wei.huang2@amd.com>
To: linux-kernel@vger.kernel.org
Cc: rjw@rjwysocki.net, rafael@kernel.org, linux-pm@vger.kernel.org,
viresh.kumar@linaro.org, wei.huang2@amd.com
Subject: [PATCH v2 1/1] acpi-cpufreq: Honor _PSD table setting in CPU frequency control
Date: Sun, 18 Oct 2020 22:57:41 -0500 [thread overview]
Message-ID: <20201019035741.2279043-1-wei.huang2@amd.com> (raw)
acpi-cpufreq has a old quirk that overrides the _PSD table supplied by
BIOS on AMD CPUs. However the _PSD table of new AMD CPUs (Family 19h+)
now accurately reports the P-state dependency of CPU cores. Hence this
quirk needs to be fixed in order to support new CPUs' frequency control.
Fixes: acd316248205 ("acpi-cpufreq: Add quirk to disable _PSD usage on all AMD CPUs")
Signed-off-by: Wei Huang <wei.huang2@amd.com>
---
drivers/cpufreq/acpi-cpufreq.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index e4ff681faaaa..1e4fbb002a31 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -691,7 +691,8 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
cpumask_copy(policy->cpus, topology_core_cpumask(cpu));
}
- if (check_amd_hwpstate_cpu(cpu) && !acpi_pstate_strict) {
+ if (check_amd_hwpstate_cpu(cpu) && boot_cpu_data.x86 < 0x19 &&
+ !acpi_pstate_strict) {
cpumask_clear(policy->cpus);
cpumask_set_cpu(cpu, policy->cpus);
cpumask_copy(data->freqdomain_cpus,
--
2.24.1
next reply other threads:[~2020-10-19 3:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 3:57 Wei Huang [this message]
2020-10-19 15:29 ` [PATCH v2 1/1] acpi-cpufreq: Honor _PSD table setting in CPU frequency control Rafael J. Wysocki
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