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Various small LPM fixes #691

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Merged
praneethbajjuri merged 7 commits into from
Apr 24, 2026
Merged

Various small LPM fixes #691

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c77fc0b
fix(pm_runtime_pm): remove DSS from AM62D runtime PM devices
kwillis01 Apr 23, 2026
e238c79
refactor(pm_runtime_pm): change runtime PM example to use ospi device
kwillis01 Apr 23, 2026
4c25498
fix(pm_low_power_modes): remove platform specific shell prompt
kwillis01 Apr 23, 2026
129ed0c
fix(pm_low_power_modes): remove reference to previous SDK
kwillis01 Apr 23, 2026
5956476
feat(pm_sw_arch): add TRM for each platform
kwillis01 Apr 23, 2026
a059db2
chore(pm_wakeup_sources): update MCU + SDK links for SDK 12.0
kwillis01 Apr 23, 2026
33c3e11
feat(linux): update 12.00.00 release notes for power improvements
kwillis01 Apr 23, 2026
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1 change: 1 addition & 0 deletions source/devices/AM62PX/linux/Release_Specific_Release_Notes.rst
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Expand Up @@ -53,6 +53,7 @@
- Review Issue Tracker Section for the new fixes.
- Security: ATF and OPTEE memory firewall for isolation from Linux
- Security: Yocto reference for LUKS2 root filesystem encryption with fTPM key management
- Power: Reduced power consumption using MCU Only low power mode by 35%

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'MCU') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'MCU') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/devices/AM62PX/linux/Release_Specific_Release_Notes.rst", "range": {"start": {"line": 56, "column": 44}}}, "severity": "INFO"}

**Key Release References:**

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1 change: 1 addition & 0 deletions source/devices/AM62X/linux/Release_Specific_Release_Notes.rst
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Expand Up @@ -50,6 +50,7 @@ What's new
- Review Issue Tracker Section for the new fixes.
- Security: ATF and OPTEE memory firewall for isolation from Linux
- Security: Yocto reference for LUKS2 root filesystem encryption with fTPM key management
- Power: Reduced power consumption using MCU Only low power mode by 13%

**Key Release References:**

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26 changes: 12 additions & 14 deletions source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst
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Expand Up @@ -21,10 +21,8 @@
#. Deep Sleep
#. MCU Only

TI SDK 10.0 (ti-linux-6.6.y kernel and 10.0 DM firmware) adds support for
an updated LPM Software Architecture that seamlessly manages the various
Suspend-to-RAM modes supported by AM62 family of devices. More details about
this architecture can be found in :ref:`LPM constraints framework<pm_constraints_fwk>` section.
More details about the low power mode architecture can be found in

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[RedHat.PassiveVoice] 'be found' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.

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{"message": "[RedHat.PassiveVoice] 'be found' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_low_power_modes.rst", "range": {"start": {"line": 24, "column": 56}}}, "severity": "INFO"}
:ref:`LPM constraints framework<pm_constraints_fwk>` section.

***********
Partial I/O
Expand Down Expand Up @@ -158,35 +156,35 @@

.. code-block:: console

root@am62axx-evm:~# echo disabled > /sys/class/rtc/rtc0/device/power/wakeup
root@am62axx-evm:~# echo disabled > /sys/bus/platform/devices/2800000.serial/power/wakeup
root@am62axx-evm:~# echo disabled > /sys/devices/platform/bus@f0000/f900000.dwc3-usb/power/wakeup
root@am62axx-evm:~# echo disabled > /sys/devices/platform/bus@f0000/f910000.dwc3-usb/power/wakeup
root@<machine>:~# echo disabled > /sys/class/rtc/rtc0/device/power/wakeup
root@<machine>:~# echo disabled > /sys/bus/platform/devices/2800000.serial/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f900000.dwc3-usb/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f910000.dwc3-usb/power/wakeup

.. ifconfig:: CONFIG_part_variant in ('AM62PX')

.. code-block:: console

root@am62pxx-evm:~# echo disabled > /sys/class/rtc/rtc0/device/power/wakeup
root@am62pxx-evm:~# echo disabled > /sys/bus/platform/devices/2800000.serial/power/wakeup
root@am62pxx-evm:~# echo disabled > /sys/devices/platform/bus@f0000/f900000.usb/power/wakeup
root@am62pxx-evm:~# echo disabled > /sys/devices/platform/bus@f0000/f910000.usb/power/wakeup
root@<machine>:~# echo disabled > /sys/class/rtc/rtc0/device/power/wakeup
root@<machine>:~# echo disabled > /sys/bus/platform/devices/2800000.serial/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f900000.usb/power/wakeup
root@<machine>:~# echo disabled > /sys/devices/platform/bus@f0000/f910000.usb/power/wakeup

.. rubric:: Then, configure PMIC register bit to turn off only selected rails for this mode.

.. ifconfig:: CONFIG_part_variant in ('AM62AX', 'AM62DX')

.. code-block:: console

root@am62axx-evm:~# i2cset -f -y -m 0xFF -r -a 0 0x48 0x86 0x1
root@<machine>:~# i2cset -f -y -m 0xFF -r -a 0 0x48 0x86 0x1

The register write has been done to enable PMIC to enter `PMIC S2R <https://www.ti.com/lit/ug/slvucm3/slvucm3.pdf>`_ .

.. ifconfig:: CONFIG_part_variant in ('AM62PX')

.. code-block:: console

root@am62pxx-evm:~# i2cset -f -y -m 0xFF -r -a 0 0x48 0x86 0x2
root@<machine>:~# i2cset -f -y -m 0xFF -r -a 0 0x48 0x86 0x2

.. rubric:: Now, the SoC can be suspended using the following command:

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51 changes: 30 additions & 21 deletions source/linux/Foundational_Components/Power_Management/pm_runtime_pm.rst
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Expand Up @@ -32,7 +32,7 @@

.. ifconfig:: CONFIG_part_variant in ('AM62DX')

DSS, McASP, OSPI, MCAN.
McASP, OSPI, MCAN.

.. rubric:: Driver Usage

Expand All @@ -45,35 +45,44 @@
#. *runtime_status:* current status of the device. It can be suspended, active, or unsupported.
#. *runtime_suspended_time:* period that device has been suspended.

For example, here are the default values for DSS device:
For example, here are the default values for OSPI device:

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[RedHat.Definitions] Define acronyms and abbreviations (such as 'OSPI') on first occurrence if they're likely to be unfamiliar.

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'OSPI') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_runtime_pm.rst", "range": {"start": {"line": 48, "column": 46}}}, "severity": "INFO"}

.. code-block:: console

root@am62xx-evm:~# tail -n +1 /sys/devices/platform/bus@f0000/30200000.dss/power/*
==> /sys/devices/platform/bus@f0000/30200000.dss/power/autosuspend_delay_ms <==
1000
root@<machine>:~# tail -n +1 /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/*
==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/autosuspend_delay_ms <==
2000

==> /sys/devices/platform/bus@f0000/30200000.dss/power/control <==
auto
==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/control <==
auto

==> /sys/devices/platform/bus@f0000/30200000.dss/power/runtime_active_time <==
24129
==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/runtime_active_time <==
8612

==> /sys/devices/platform/bus@f0000/30200000.dss/power/runtime_status <==
active
==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/runtime_status <==
suspended

==> /sys/devices/platform/bus@f0000/30200000.dss/power/runtime_suspended_time <==
0
==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/runtime_suspended_time <==
734540

To disable Runtime PM for the DSS device, the "control" parameter can be
To disable Runtime PM for the OSPI device, the "control" parameter can be

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[RedHat.PassiveVoice] 'be changed' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.

Raw Output:
{"message": "[RedHat.PassiveVoice] 'be changed' is passive voice. In general, use active voice. Consult the style guide for acceptable use of passive voice.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_runtime_pm.rst", "range": {"start": {"line": 68, "column": 72}}}, "severity": "INFO"}

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[vale] reported by reviewdog 🐶
[RedHat.Definitions] Define acronyms and abbreviations (such as 'OSPI') on first occurrence if they're likely to be unfamiliar.

Raw Output:
{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'OSPI') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Power_Management/pm_runtime_pm.rst", "range": {"start": {"line": 68, "column": 31}}}, "severity": "INFO"}
changed to "on":

.. code-block:: console

root@<machine>:~# echo on > /sys/devices/platform/bus@f0000/30200000.dss/power/control
root@<machine>:~# cat /sys/devices/platform/bus@f0000/30200000.dss/power/*
1000
on
4629
active
199277671
root@<machine>:~# echo on > /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/control
root@<machine>:~# tail -n +1 /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/*
==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/autosuspend_delay_ms <==
2000

==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/control <==
on

==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/runtime_active_time <==
11797

==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/runtime_status <==
active

==> /sys/devices/platform/bus@f0000/fc00000.bus/fc40000.spi/power/runtime_suspended_time <==
770604
25 changes: 22 additions & 3 deletions source/linux/Foundational_Components/Power_Management/pm_sw_arch.rst
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Expand Up @@ -251,7 +251,26 @@ The mode selection is done using resume latencies as mentioned in TI SCI LPM Doc
Learning Resources
******************

#. `AM62x Technical Reference Manual <https://www.ti.com/lit/pdf/spruiv7>`__
#. `Technical White Paper on Enabling Low Power on AM62x <https://www.ti.com/lit/wp/sprad41/sprad41.pdf>`__
#. :ref:`Low Power Modes Documentation<lpm_modes>`
.. ifconfig:: CONFIG_part_variant in ('AM62X')

#. `AM62x Technical Reference Manual <https://www.ti.com/lit/pdf/spruiv7>`__
#. `Technical White Paper on Enabling Low Power on AM62x <https://www.ti.com/lit/wp/sprad41/sprad41.pdf>`__
#. :ref:`Low Power Modes Documentation<lpm_modes>`

.. ifconfig:: CONFIG_part_variant in ('AM62AX')

#. `AM62Ax Technical Reference Manual <https://www.ti.com/lit/ug/spruj16c/spruj16c.pdf>`__
#. `Technical White Paper on Enabling Low Power on AM62x <https://www.ti.com/lit/wp/sprad41/sprad41.pdf>`__
#. :ref:`Low Power Modes Documentation<lpm_modes>`

.. ifconfig:: CONFIG_part_variant in ('AM62PX')

#. `AM62Px Technical Reference Manual <https://www.ti.com/lit/ug/spruj83d/spruj83d.pdf>`__
#. `Technical White Paper on Enabling Low Power on AM62x <https://www.ti.com/lit/wp/sprad41/sprad41.pdf>`__
#. :ref:`Low Power Modes Documentation<lpm_modes>`

.. ifconfig:: CONFIG_part_variant in ('AM62DX')

#. `AM62Dx Technical Reference Manual <https://www.ti.com/lit/ug/sprujd4a/sprujd4a.pdf>`__
#. `Technical White Paper on Enabling Low Power on AM62x <https://www.ti.com/lit/wp/sprad41/sprad41.pdf>`__
#. :ref:`Low Power Modes Documentation<lpm_modes>`
10 changes: 7 additions & 3 deletions source/linux/Foundational_Components/Power_Management/pm_wakeup_sources.rst
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Expand Up @@ -967,15 +967,19 @@ MCU IPC based Wakeup

.. ifconfig:: CONFIG_part_variant in ('AM62X')

`MCU+ SDK for AM62x <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62X/11_01_00_16/exports/docs/api_guide_am62x/index.html>`__
`MCU+ SDK for AM62x <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62X/12_00_00_27/exports/docs/api_guide_am62x/index.html>`__

.. ifconfig:: CONFIG_part_variant in ('AM62AX', 'AM62DX')
.. ifconfig:: CONFIG_part_variant in ('AM62AX')

`MCU+ SDK for AM62Ax <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62AX/11_01_00_16/exports/docs/api_guide_am62ax/index.html>`__

.. ifconfig:: CONFIG_part_variant in ('AM62PX')

`MCU+ SDK for AM62Px <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62PX/11_01_01_08/exports/docs/api_guide_am62px/index.html>`__
`MCU+ SDK for AM62Px <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62PX/12_00_00_27/exports/docs/api_guide_am62px/index.html>`__

.. ifconfig:: CONFIG_part_variant in ('AM62DX')

`MCU+ SDK for AM62Dx <https://software-dl.ti.com/mcu-plus-sdk/esd/AM62DX/12_00_00_22/exports/docs/api_guide_am62dx/index.html>`__

To use MCU IPC based wakeup, system should be placed into MCU Only mode
as shown in the :ref:`LPM section<pm_mcu_only>`.
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