Merge tag 'thermal-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull thermal control updates from Rafael Wysocki:
"These add support for a new feature, Platform Temper

Merge tag 'thermal-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull thermal control updates from Rafael Wysocki:
"These add support for a new feature, Platform Temperature Control
(PTC), to the Intel int340x thermal driver, add support for the Airoha
EN7581 thermal sensor and the IPQ5018 platform, fix up the ACPI
thermal zones handling, fix other assorted issues and clean up code

Specifics:

- Add Platform Temperature Control (PTC) support to the Intel int340x
thermal driver (Srinivas Pandruvada)

- Make the Hisilicon thermal driver compile by default when ARCH_HISI
is set (Krzysztof Kozlowski)

- Clean up printk() format by using %pC instead of %pCn in the
bcm2835 thermal driver (Luca Ceresoli)

- Fix variable name coding style in the AmLogic thermal driver
(Enrique Isidoro Vazquez Ramos)

- Fix missing debugfs entry removal on failure by using the devm_
variant in the LVTS thermal driver (AngeloGioacchino Del Regno)

- Remove the unused lvts_debugfs_exit() function as the devm_ variant
introduced before takes care of removing the debugfs entry in the
LVTS driver (Arnd Bergmann)

- Add the Airoha EN7581 thermal sensor support along with its DT
bindings (Christian Marangi)

- Add ipq5018 compatible string DT binding, cleanup and add its
suppot to the QCom Tsens thermal driver (Sricharan Ramabadhran,
George Moussalem)

- Fix comments typos in the Airoha driver (Christian Marangi, Colin
Ian King)

- Address a sparse warning by making a local variable static in the
QCom thermal driver (George Moussalem)

- Fix the usage of the _SCP control method in the driver for ACPI
thermal zones (Armin Wolf)"

* tag 'thermal-6.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
thermal: qcom: ipq5018: make ops_ipq5018 struct static
thermal/drivers/airoha: Fix spelling mistake "calibrarion" -> "calibration"
ACPI: thermal: Execute _SCP before reading trip points
ACPI: OSI: Stop advertising support for "3.0 _SCP Extensions"
thermal/drivers/airoha: Fix spelling mistake
thermal/drivers/qcom/tsens: Add support for IPQ5018 tsens
thermal/drivers/qcom/tsens: Add support for tsens v1 without RPM
thermal/drivers/qcom/tsens: Update conditions to strictly evaluate for IP v2+
dt-bindings: thermal: qcom-tsens: Add ipq5018 compatible
thermal/drivers: Add support for Airoha EN7581 thermal sensor
dt-bindings: thermal: Add support for Airoha EN7581 thermal sensor
thermal/drivers/mediatek/lvts: Remove unused lvts_debugfs_exit
thermal/drivers/mediatek/lvts: Fix debugfs unregister on failure
thermal/drivers/amlogic: Rename Uptat to uptat to follow kernel coding style
vsprintf: remove redundant and unused %pCn format specifier
thermal/drivers/bcm2835: Use %pC instead of %pCn
thermal/drivers/hisi: Do not enable by default during compile testing
thermal: int340x: processor_thermal: Platform temperature control documentation
thermal: intel: int340x: Enable platform temperature control
thermal: intel: int340x: Add platform temperature control interface

show more ...

Merge branch 'thermal-intel'

Merge an update of the Intel int340x thermal driver adding Platform
Temperature Control (PTC) support to it (Srinivas Pandruvada).

* thermal-intel:
thermal: int340x:

Merge branch 'thermal-intel'

Merge an update of the Intel int340x thermal driver adding Platform
Temperature Control (PTC) support to it (Srinivas Pandruvada).

* thermal-intel:
thermal: int340x: processor_thermal: Platform temperature control documentation
thermal: intel: int340x: Enable platform temperature control
thermal: intel: int340x: Add platform temperature control interface

show more ...

thermal: intel: int340x: Add platform temperature control interface

Platform Temperature Control is a dynamic control loop implemented in
hardware to manage the skin or any board temperature of a de

thermal: intel: int340x: Add platform temperature control interface

Platform Temperature Control is a dynamic control loop implemented in
hardware to manage the skin or any board temperature of a device. The
reported skin or board temperature is controlled by comparing to a
configured target temperature and adjusting the SoC (System on Chip)
performance accordingly. The feature supports up to three platform
sensors.

OEMs (Original Equipment Manufacturers) can configure this feature
through the BIOS and provide temperature input directly to the hardware
via the Platform Environment Control Interface (PECI). As a result,
this feature can operate independently of any OS-level control.

The OS interface can be used to further fine-tune the default OEM
configuration. Here are some scenarios where the OS interface is
beneficial:

Verification of Firmware Control: Check if firmware-based control is
enabled. If it is, thermal controls from the OS/user space can be
backed out.

Adjusting Target Limits: While OEMs can set an aggressive target limit,
the OS can adjust this to a less aggressive limit based on operating
modes or conditions.

Given that this is platform temperature control, it is expected that a
single user-level manager owns and manages the controls. If multiple
user-level software applications attempt to write different targets, it
can lead to unexpected behavior. For instance, on a Linux desktop, the
Linux thermal daemon can manage these temperature controls, as it has
access to all other temperature control settings.

The hardware control interface is via MMIO offsets in the processor
thermal device MMIO space. There are three instances of MMIO registers.
Refer to the platform_temperature_control.c for MMIO details.

Expose "enable" and "temperature_target" via sysfs.

There are three instances of this controls. So up to three different
sensors can be controlled independently.

Sysfs interface:

tree /sys/bus/pci/devices/0000\:00\:04.0/ptc_?_control/
/sys/bus/pci/devices/0000:00:04.0/ptc_0_control/
├── enable
└── temperature_target
/sys/bus/pci/devices/0000:00:04.0/ptc_1_control/
├── enable
└── temperature_target
/sys/bus/pci/devices/0000:00:04.0/ptc_2_control/
├── enable
└── temperature_target

Description of attributes:

Enable: 1 for enable, 0 for disable. This attribute can be used to
read the current status. User space can write 0 or 1 to disable or
enable this feature respectively.

temperature_target: Target temperature limit to which hardware
will try to limit in milli degree C.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20250429000110.236243-2-srinivas.pandruvada@linux.intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

show more ...