Messages in this thread Patch in this message | | | From | Punit Agrawal <> | Subject | [RFC PATCH 2/4] cpufreq: acpi-cpufreq: Add processor to the ignore PSD override list | Date | Wed, 25 Nov 2020 23:48:45 +0900 |
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Booting Linux on a Zen2 based processor (family: 0x17, model: 0x60, stepping: 0x1) shows the following message in the logs -
acpi_cpufreq: overriding BIOS provided _PSD data
Although commit 5368512abe08 ("acpi-cpufreq: Honor _PSD table setting on new AMD CPUs") indicates that the override is not required for Zen3 onwards, it seems that domain information can be trusted even on certain earlier systems. Update the check, to skip the override for Zen2 processors known to work without the override.
Signed-off-by: Punit Agrawal <punitagrawal@gmail.com> Cc: Wei Huang <wei.huang2@amd.com> --- drivers/cpufreq/acpi-cpufreq.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index b1e7df96d428..29f1cd93541e 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -198,8 +198,13 @@ static int override_acpi_psd(unsigned int cpu_id) if (c->x86_vendor == X86_VENDOR_AMD) { if (!check_amd_hwpstate_cpu(cpu_id)) return false; - - return c->x86 < 0x19; + /* + * CPU's before Zen3 (except some Zen2) need the + * override. + */ + return (c->x86 < 0x19) && + !(c->x86 == 0x17 && c->x86_model == 0x60 && + c->x86_stepping == 0x1); } return false; -- 2.29.2
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