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Wysocki" , Viresh Kumar , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Giovanni Gherdovich Subject: [PATCH] cpufreq/amd-pstate: Supply nominal/lowest freq for TRX40-based motherboards Date: Wed, 7 Oct 2026 16:41:50 +0200 Message-ID: <20261007144150.15113-1-ggherdovich@suse.cz> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Score: -2.80 X-Spam-Level: X-Spam-Flag: NO X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_SEVEN(0.00)[9]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.cz:email,imap1.dmz-prg2.suse.org:helo]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[] Some motherboard based on the TRX40 chipset has been reported to ship firmware lacking lowest and nominal frequency values in the _CPC ACPI package. That is, it supports CPPC V2 but not CPPC V3. Firmware updates aren't available. amd-pstate requires explicit knowledge of nominal frequency, so it can't load on this hardware. The driver already has a mechanism (the so-called "quirks") to accommodate for missing nominal freq in ACPI tables, so here we use it to match against CPU family, model, core count, and BIOS version. Signed-off-by: Giovanni Gherdovich --- drivers/cpufreq/amd-pstate.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 8bfd46d60843..532ff16dd076 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -145,6 +145,11 @@ static struct quirk_entry quirk_amd_7k62 = { .lowest_freq = 550, }; +static struct quirk_entry quirk_amd_ryzen_threadripper_3000_24c = { + .nominal_freq = 3800, + .lowest_freq = 550, +}; + static inline u8 freq_to_perf(union perf_cached perf, u32 nominal_freq, unsigned int freq_val) { u32 perf_val = DIV_ROUND_UP_ULL((u64)freq_val * perf.nominal_perf, nominal_freq); @@ -174,6 +179,22 @@ static int __init dmi_matched_7k62_bios_bug(const struct dmi_system_id *dmi) return 0; } +static int __init dmi_matched_trx40_bios_bug(const struct dmi_system_id *dmi) +{ + /** + * Match the Ryzen Threadripper 3000 series, 24-core SKU, sTRX4 socket / TRX40 chipset. + */ + if (boot_cpu_data.x86 == 0x17 && + boot_cpu_data.x86_model >= 0x30 && boot_cpu_data.x86_model <= 0x3F && + topology_num_cores_per_package() == 24) { + quirks = dmi->driver_data; + pr_info("Overriding nominal and lowest frequencies for %s\n", dmi->ident); + return 1; + } + + return 0; +} + static const struct dmi_system_id amd_pstate_quirks_table[] __initconst = { { .callback = dmi_matched_7k62_bios_bug, @@ -184,6 +205,16 @@ static const struct dmi_system_id amd_pstate_quirks_table[] __initconst = { }, .driver_data = &quirk_amd_7k62, }, + { + .callback = dmi_matched_trx40_bios_bug, + .ident = "AMD Ryzen Threadripper 3000", + .matches = { + DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends International"), + DMI_MATCH(DMI_BIOS_VERSION, "2.80"), + DMI_MATCH(DMI_BIOS_DATE, "05/17/2022"), + }, + .driver_data = &quirk_amd_ryzen_threadripper_3000_24c, + }, {} }; MODULE_DEVICE_TABLE(dmi, amd_pstate_quirks_table); -- 2.43.0