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linux/drivers/acpi
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Henry Tseng 16fb8d8a0e cpufreq: acpi-cpufreq: use DMI max speed when CPPC is unavailable 
On AMD Ryzen Embedded V1780B (Family 17h, Zen 1), the BIOS does not
provide ACPI _CPC objects and the CPU does not support MSR-based CPPC
(X86_FEATURE_CPPC).  The _PSS table only lists nominal P-states
(P0 = 3350 MHz), so when get_max_boost_ratio() fails at
cppc_get_perf_caps(), cpuinfo_max_freq reports only the base frequency
instead of the rated boost frequency (3600 MHz).

  dmesg:
    ACPI CPPC: No CPC descriptor for CPU:0
    acpi_cpufreq: CPU0: Unable to get performance capabilities (-19)

cppc-cpufreq already has a DMI fallback (cppc_get_dmi_max_khz()) that
reads the processor max speed from SMBIOS Type 4.  Export it and reuse
it in acpi-cpufreq as a last-resort source for the boost frequency.

A sanity check ensures the DMI value is above the _PSS P0 frequency
and within 2x of it; values outside that range are ignored and the
existing arch_set_max_freq_ratio() path is taken instead.  The 2x
upper bound is based on a survey of the AMD Ryzen Embedded V1000
series, where the highest boost-to-base ratio is 1.8x (V1404I:
2.0 GHz base / 3.6 GHz boost).

The DMI lookup and sanity check are wrapped in a helper,
acpi_cpufreq_resolve_max_freq(), which falls through to
arch_set_max_freq_ratio() if the DMI value is absent or
out of range.

Tested on AMD Ryzen Embedded V1780B with v7.0-rc4:

  Before: cpuinfo_max_freq = 3350000 (base only)
  After:  cpuinfo_max_freq = 3600000 (includes boost)

Link: https://www.amd.com/en/products/embedded/ryzen/ryzen-v1000-series.html#specifications
Signed-off-by: Henry Tseng <henrytseng@qnap.com>
Link: https://patch.msgid.link/20260324090948.1667340-1-henrytseng@qnap.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 		2026-03-25 14:29:05 +01:00
..
acpica ACPICA: ACPI 6.6: Add _VDM (Voltage Domain) object 2026-01-15 18:17:49 +01:00
apei Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
arm64 Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
dptf Thermal control updates for 6.19-rc1 2025-12-02 17:49:12 -08:00
nfit Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
numa Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pmic
…
riscv Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
x86 Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
Kconfig ACPI: extlog: Trace CPER CXL Protocol Error Section 2026-01-14 17:09:34 +01:00
Makefile
…
ac.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_adxl.c
…
acpi_apd.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_configfs.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_dbg.c ACPI: debug: fix signedness issues in read/write helpers 2025-09-23 15:45:28 +02:00
acpi_extlog.c ACPI: extlog: Trace CPER CXL Protocol Error Section 2026-01-14 17:09:34 +01:00
acpi_ffh.c
…
acpi_fpdt.c
…
acpi_ipmi.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_lpat.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_lpit.c
…
acpi_memhotplug.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_mrrm.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_pad.c ACPI: PAD: Update arguments of mwait_idle_with_hints() 2025-06-10 20:47:56 +02:00
acpi_pcc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_platform.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_pnp.c ACPI: PNP: Drop acpi_nonpnp_device_ids[] 2025-12-16 21:51:04 +01:00
acpi_processor.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
acpi_tad.c ACPI: TAD: Use PM_RUNTIME_ACQUIRE()/PM_RUNTIME_ACQUIRE_ERR() 2025-11-14 21:25:15 +01:00
acpi_video.c Convert remaining multi-line kmalloc_obj/flex GFP_KERNEL uses 2026-02-22 08:26:33 -08:00
acpi_watchdog.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
battery.c ACPI: battery: Drop redundant checks from acpi_battery_remove() 2026-02-13 14:22:19 +01:00
bgrt.c sysfs: treewide: switch back to attribute_group::bin_attrs 2025-06-17 10:44:15 +02:00
bus.c Merge branch 'acpi-driver' 2026-02-05 14:47:50 +01:00
button.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
container.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cppc_acpi.c cpufreq: acpi-cpufreq: use DMI max speed when CPPC is unavailable 2026-03-25 14:29:05 +01:00
debugfs.c
…
device_pm.c Merge branch 'acpi-driver' 2026-02-05 14:47:50 +01:00
device_sysfs.c ACPI: sysfs: Replace sprintf() with sysfs_emit() 2026-01-27 21:58:58 +01:00
dock.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ec.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
ec_sys.c
…
event.c
…
evged.c
…
fan.h Thermal control updates for 6.19-rc1 2025-12-02 17:49:12 -08:00
fan_attr.c ACPI: fan: Use ACPI handle when retrieving _FST 2025-10-24 10:29:08 +02:00
fan_core.c ACPI: fan: Add support for Microsoft fan extensions 2025-10-27 20:56:01 +01:00
fan_hwmon.c ACPI: fan: Add hwmon notification support 2025-10-27 20:56:01 +01:00
glue.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hed.c ACPI: HED: Convert the driver to a platform one 2025-12-29 21:04:10 +01:00
internal.h ACPI: DPTF: Remove int340x thermal scan handler 2025-11-07 20:45:37 +01:00
ioapic.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
irq.c ACPI: irq: Add interrupt affinity reporting interface 2025-10-27 17:16:32 +01:00
mipi-disco-img.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
nhlt.c
…
nvs.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
osi.c ACPI: OSI: Add DMI quirk for Acer Aspire One D255 2026-02-24 15:43:51 +01:00
osl.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pci_irq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pci_link.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pci_mcfg.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pci_root.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pci_slot.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pfr_telemetry.c
…
pfr_update.c ACPI: pfr_update: Fix the driver update version check 2025-08-20 15:30:36 +02:00
platform_profile.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
power.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
pptt.c ACPI / PPTT: Add a helper to fill a cpumask from a cache_id 2025-11-19 18:34:14 +00:00
prmt.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
proc.c ACPI: proc: Prefer to use octal permission 2025-06-26 21:08:13 +02:00
processor_core.c ACPI: processor_core: fix map_x2apic_id for amd-pstate on am4 2025-11-26 18:06:25 +01:00
processor_driver.c ACPI: processor: Do not expose global variable acpi_idle_driver 2026-01-09 22:38:22 +01:00
processor_idle.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
processor_pdc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
processor_perflib.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
processor_thermal.c ACPI: processor: thermal: Release policy references using __free() 2025-09-08 19:53:32 +02:00
processor_throttling.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
property.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
reboot.c
…
resource.c ACPI: resource: Add JWIPC JVC9100 to irq1_level_low_skip_override[] 2026-01-14 17:25:19 +01:00
sbs.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sbshc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sbshc.h
…
scan.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
sleep.c ACPI: PM: Save NVS memory on Lenovo G70-35 2026-02-19 11:54:52 +01:00
sleep.h ACPI: PM: s2idle: Staticise LPS0 callback functions 2025-10-20 20:39:33 +02:00
spcr.c ACPI: SPCR: Check for table version when using precise baudrate 2025-10-27 20:43:41 +01:00
sysfs.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
tables.c ACPI / MPAM: Parse the MPAM table 2025-11-19 18:34:20 +00:00
thermal.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
thermal_lib.c
…
tiny-power-button.c ACPI: tiny-power-button: Convert the driver to a platform one 2025-12-26 15:08:57 +01:00
utils.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
video_detect.c ACPI: video: force native for Lenovo 82K8 2025-08-25 20:00:17 +02:00
viot.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
wakeup.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00