From: Wei Huang <wei.huang2@amd.com>
To: linux-kernel@vger.kernel.org
Cc: rjw@rjwysocki.net, viresh.kumar@linaro.org,
linux-pm@vger.kernel.org, wei.huang2@amd.com
Subject: [PATCH 1/1] acpi-cpufreq: Honor _PSD table setting in CPU frequency control
Date: Wed, 7 Oct 2020 15:44:12 -0500 [thread overview]
Message-ID: <20201007204412.565881-1-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..1e6e2abde428 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) && (c->x86 < 0x19) &&
+ !acpi_pstate_strict) {
cpumask_clear(policy->cpus);
cpumask_set_cpu(cpu, policy->cpus);
cpumask_copy(data->freqdomain_cpus,
--
2.26.2
next reply other threads:[~2020-10-07 20:44 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 20:44 Wei Huang [this message]
2020-10-16 14:58 ` [PATCH 1/1] acpi-cpufreq: Honor _PSD table setting in CPU frequency control Rafael J. Wysocki
2020-10-16 16:08 ` Wei Huang
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