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gehariprasath merged 2 commits into from
Dec 16, 2025
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feat(linux): Add documentation for dynamic DDR refresh rate change #572

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8d55e70
chore(linux): Make U-Boot DDR documentation generic
Dec 8, 2025
29ec80b
feat(linux): Add documentation for dynamic DDR refresh rate change
Dec 9, 2025
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1 change: 1 addition & 0 deletions configs/AM62AX/AM62AX_linux_toc.txt
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Expand Up @@ -55,6 +55,7 @@ linux/Foundational_Components_Kernel_Drivers
linux/Foundational_Components/Kernel/Kernel_Drivers/Audio
linux/Foundational_Components/Kernel/Kernel_Drivers/Camera/CSI2RX
linux/Foundational_Components/Kernel/Kernel_Drivers/Crypto/SA2UL_OMAP
linux/Foundational_Components/Kernel/Kernel_Drivers/DDR
linux/Foundational_Components/Kernel/Kernel_Drivers/Display/DSS7
linux/Foundational_Components/Kernel/Kernel_Drivers/DM-Timer
linux/Foundational_Components/Kernel/Kernel_Drivers/EQEP
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1 change: 1 addition & 0 deletions configs/AM62PX/AM62PX_linux_toc.txt
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Expand Up @@ -56,6 +56,7 @@ linux/Foundational_Components_Kernel_Drivers
linux/Foundational_Components/Kernel/Kernel_Drivers/Audio
linux/Foundational_Components/Kernel/Kernel_Drivers/Camera/CSI2RX
linux/Foundational_Components/Kernel/Kernel_Drivers/Crypto/SA2UL_OMAP
linux/Foundational_Components/Kernel/Kernel_Drivers/DDR
linux/Foundational_Components/Kernel/Kernel_Drivers/Display/DSS7
linux/Foundational_Components/Kernel/Kernel_Drivers/DM-Timer
linux/Foundational_Components/Kernel/Kernel_Drivers/EQEP
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1 change: 1 addition & 0 deletions configs/AM62X/AM62X_linux_toc.txt
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Expand Up @@ -55,6 +55,7 @@ linux/Foundational_Components_Kernel_Drivers
linux/Foundational_Components/Kernel/Kernel_Drivers/Audio
linux/Foundational_Components/Kernel/Kernel_Drivers/Camera/CSI2RX
linux/Foundational_Components/Kernel/Kernel_Drivers/Crypto/SA2UL_OMAP
linux/Foundational_Components/Kernel/Kernel_Drivers/DDR
linux/Foundational_Components/Kernel/Kernel_Drivers/Display/DSS7
linux/Foundational_Components/Kernel/Kernel_Drivers/DM-Timer
linux/Foundational_Components/Kernel/Kernel_Drivers/EQEP
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1 change: 1 addition & 0 deletions configs/AM64X/AM64X_linux_toc.txt
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Expand Up @@ -48,6 +48,7 @@ linux/Foundational_Components_Kernel
linux/Foundational_Components_Kernel_Drivers
linux/Foundational_Components/Kernel/Kernel_Drivers/ADC
linux/Foundational_Components/Kernel/Kernel_Drivers/Crypto/SA2UL_OMAP
linux/Foundational_Components/Kernel/Kernel_Drivers/DDR
linux/Foundational_Components/Kernel/Kernel_Drivers/DM-Timer
linux/Foundational_Components/Kernel/Kernel_Drivers/EQEP
linux/Foundational_Components/Kernel/Kernel_Drivers/GPIO
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2 changes: 2 additions & 0 deletions configs/J7200/J7200_linux_toc.txt
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Expand Up @@ -37,6 +37,7 @@ linux/Foundational_Components/U-Boot/UG-NOR
linux/Foundational_Components/U-Boot/UG-UART
linux/Foundational_Components/U-Boot/UG-SATA
linux/Foundational_Components/U-Boot/UG-UFS
linux/Foundational_Components/U-Boot/UG-DDRSS-J7
linux/Foundational_Components/U-Boot/UG-HyperBus
linux/Foundational_Components/U-Boot/UG-RemoteProc
linux/Foundational_Components/U-Boot/UG-AVS
Expand All @@ -49,6 +50,7 @@ linux/Foundational_Components_Kernel
linux/Foundational_Components_Kernel_Drivers
linux/Foundational_Components/Kernel/Kernel_Drivers/ADC
linux/Foundational_Components/Kernel/Kernel_Drivers/Crypto/SA2UL_OMAP
linux/Foundational_Components/Kernel/Kernel_Drivers/DDR
linux/Foundational_Components/Kernel/Kernel_Drivers/DM-Timer
linux/Foundational_Components/Kernel/Kernel_Drivers/MCAN
linux/Foundational_Components/Kernel/Kernel_Drivers/GPIO
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2 changes: 2 additions & 0 deletions configs/J721E/J721E_linux_toc.txt
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Expand Up @@ -37,6 +37,7 @@ linux/Foundational_Components/U-Boot/UG-NOR
linux/Foundational_Components/U-Boot/UG-UART
linux/Foundational_Components/U-Boot/UG-SATA
linux/Foundational_Components/U-Boot/UG-UFS
linux/Foundational_Components/U-Boot/UG-DDRSS-J7
linux/Foundational_Components/U-Boot/UG-HyperBus
linux/Foundational_Components/U-Boot/UG-RemoteProc
linux/Foundational_Components/U-Boot/UG-AVS
Expand All @@ -51,6 +52,7 @@ linux/Foundational_Components/Kernel/Kernel_Drivers/ADC
linux/Foundational_Components/Kernel/Kernel_Drivers/Audio
linux/Foundational_Components/Kernel/Kernel_Drivers/Camera/CSI2RX
linux/Foundational_Components/Kernel/Kernel_Drivers/Crypto/SA2UL_OMAP
linux/Foundational_Components/Kernel/Kernel_Drivers/DDR
linux/Foundational_Components/Kernel/Kernel_Drivers/Display/DSS7
linux/Foundational_Components/Kernel/Kernel_Drivers/DM-Timer
linux/Foundational_Components/Kernel/Kernel_Drivers/GPIO
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95 changes: 95 additions & 0 deletions source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst
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.. _K3-DDR-Driver:

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[RedHat.ReadabilityGrade] Simplify your language. The calculated Flesch–Kincaid grade level of 11.91 is above the recommended reading grade level of 9.

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{"message": "[RedHat.ReadabilityGrade] Simplify your language. The calculated Flesch–Kincaid grade level of 11.91 is above the recommended reading grade level of 9.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 1, "column": 1}}}, "severity": "INFO"}
.. _ddr-driver:

######
K3 DDR

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'DDR') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 5, "column": 4}}}, "severity": "INFO"}

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[RedHat.Headings] Use sentence-style capitalization in 'K3 DDR'.

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{"message": "[RedHat.Headings] Use sentence-style capitalization in 'K3 DDR'.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 5, "column": 1}}}, "severity": "INFO"}
######

************
Introduction
************

The K3 DDR driver provides management and monitoring capabilities for DDR memory

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

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'DDR') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 12, "column": 8}}}, "severity": "INFO"}
subsystems on Texas Instruments K3 SoCs.

The following is a list of supported K3 DDR driver features by device family:

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'DDR') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 15, "column": 41}}}, "severity": "INFO"}

.. list-table:: K3 DDR Driver Feature Support

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'DDR') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 17, "column": 20}}}, "severity": "INFO"}
:header-rows: 1

* - Device Family
- Temperature Monitoring

* - J7200
- Yes

* - AM62x LP SK/ AM62Ax / AM62Px
- Yes

********************************
Building and Enabling the Driver

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{"message": "[RedHat.Headings] Use sentence-style capitalization in 'Building and Enabling the Driver'.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 30, "column": 1}}}, "severity": "INFO"}
********************************

.. rubric:: Kernel Configuration

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{"message": "[RedHat.CaseSensitiveTerms] Use 'kernel' rather than 'Kernel'.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 33, "column": 13}}}, "severity": "WARNING"}

The following kernel configuration enables the K3 DDR driver:

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

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{"message": "[RedHat.Definitions] Define acronyms and abbreviations (such as 'DDR') on first occurrence if they're likely to be unfamiliar.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 35, "column": 51}}}, "severity": "INFO"}

.. code-block:: kconfig

CONFIG_K3_DDR_TEMP=y
CONFIG_HWMON=y

.. _ddr-temperature-monitoring-linux:

************************************
Using the DDR Temperature Monitoring

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[RedHat.Headings] Use sentence-style capitalization in 'Using the DDR Temperature Monitoring'.

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{"message": "[RedHat.Headings] Use sentence-style capitalization in 'Using the DDR Temperature Monitoring'.", "location": {"path": "source/linux/Foundational_Components/Kernel/Kernel_Drivers/DDR.rst", "range": {"start": {"line": 45, "column": 1}}}, "severity": "INFO"}
************************************

By default, the DDR subsystem keeps temperature polling turned off. For allowing
the kernel driver to monitor temperature, the user must enable polling during
DDR configuration and initialization at boot time.

See :ref:`ddr-temperature-monitoring-uboot` in U-Boot documentation.

The K3 DDR driver creates a hwmon device that provides temperature status
information through sysfs. The driver registers as ``k3_ddr`` in the hwmon
subsystem for temperature monitoring functionality.

The driver reports temperature status according to LPDDR4 specification:

.. list-table::
:header-rows: 1
:stub-columns: 1

* - Value
- Temperature Status
* - 0
- Low temperature
* - 1
- 4x refresh interval
* - 2
- 2x refresh interval
* - 3
- 1x refresh interval (nominal)
* - 4
- 0.5x refresh interval
* - 5
- 0.25x refresh interval
* - 6
- 0.25x refresh interval with derating
* - 7
- High temperature

The hwmon device should now show up in the filesystem.

.. code-block:: console

root@evm:~# ls -l /sys/class/hwmon/
hwmon0

Check the current DDR temperature status:

.. code-block:: console

root@evm:~# cat /sys/class/hwmon/hwmon0/device/k3_ddr_temp_status
1x refresh interval
89 changes: 66 additions & 23 deletions source/linux/Foundational_Components/U-Boot/UG-DDRSS-J7.rst
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@@ -1,18 +1,61 @@
#########
DDRSS ECC
#########
###
DDR
###

********
Overview
********

The DDR subsystem (DDRSS) comprises DDR controller, DDR PHY and wrapper logic
to integrate these blocks in the device. For SDRAM data integrity, the DDRSS
The DDR subsystem (DDRSS) comprises DDR controller, DDR PHY and wrapper logic to
integrate these blocks in the device. The K3 DDRSS driver
(:file:`drivers/ram/k3-ddrss/k3-ddrss.c`) runs during the R5 SPL stage and is
responsible for initializing and configuring the DDR subsystem.

.. _ddr-init:

******************
DDR Initialization
******************

The driver utilizes an auto-generated configuration file containing the
necessary settings for the DDR. It configures the frequency, timing parameters,
training algorithms etc. for DDR initialization. The configuration DTSI can be
generated using the `Sysconfig tool <https://dev.ti.com/sysconfig>`_ and
selecting the software product as "DDR Configuration for \*" as well as the
required device.

.. _ddr-temperature-monitoring-uboot:

**************************
DDR Temperature Monitoring
**************************

For enabling temperature polling in the DDR subsystem, the configuration DTSI
(see :ref:`ddr-init`) must be regenerated after selecting 'Yes'
for LPDDR > DDRSS x > Enable DRAM Temperature Polling and also changing the DRAM
Timing Parameters as prompted by the tool.

.. ifconfig:: CONFIG_part_variant in ('J7200', 'J721E')

The kernel DDR driver utilizes this polling feature to provide base support for
dynamic DDR refresh rate changes (see :ref:`ddr-temperature-monitoring-linux`)

**********
Inline ECC
**********

.. ifconfig:: CONFIG_part_variant in ('J7200', 'J721E')

.. note::

Inline ECC is currently not tested and supported for J721E and J7200

For SDRAM data integrity, the DDRSS
bridge supports inline ECC on the data written to or read from the SDRAM. ECC
is stored together with the data so that a dedicated SDRAM device for ECC is
not required. The 8-bit single error correction double error detection (SECDED)
ECC data is calculated over 64-bit data quanta. For every 256-byte data block
32 bytes of ECC is stored inline. Thus 1/9th of the total SDRAM space is used
32 bytes of ECC is stored inline. Thus, 1/9th of the total SDRAM space is used
for ECC storage and the remaining 8/9th of the SDRAM data space are seen as
consecutive byte addresses. Even if there are non-ECC protected regions the
previously described 1/9th-8/9th rule still applies and consecutive byte
Expand All @@ -25,8 +68,8 @@ protected by it. 1-bit error is correctable by ECC, but multi-bit and
multiple 1-bit errors are not correctable and will be treated as an
uncorrectable error. Any uncorrectable error will cause a bus abort.

DDRSS inline ECC handling
=========================
ECC Handling
============

.. note::

Expand All @@ -35,22 +78,22 @@ DDRSS inline ECC handling
Enabling inline ECC
-------------------

The inline ECC feature of DDRSS can be enabled by adding the
``CONFIG_K3_INLINE_ECC`` config to the R5 defconfig:
The inline ECC feature of DDRSS can be enabled by adding the
``CONFIG_K3_INLINE_ECC`` config to the R5 defconfig:

.. code-block:: kconfig
.. code-block:: kconfig

# u-boot/configs/*_r5_defconfig
# u-boot/configs/*_r5_defconfig

CONFIG_PINCTRL_SINGLE=y
CONFIG_POWER_DOMAIN=y
CONFIG_TI_POWER_DOMAIN=y
CONFIG_K3_INLINE_ECC=y
CONFIG_K3_SYSTEM_CONTROLLER=y
CONFIG_REMOTEPROC_TI_K3_ARM64=y
CONFIG_RESET_TI_SCI=y
CONFIG_PINCTRL_SINGLE=y
CONFIG_POWER_DOMAIN=y
CONFIG_TI_POWER_DOMAIN=y
CONFIG_K3_INLINE_ECC=y
CONFIG_K3_SYSTEM_CONTROLLER=y
CONFIG_REMOTEPROC_TI_K3_ARM64=y
CONFIG_RESET_TI_SCI=y

This enables inline ECC for the entire region of the DDR.
This enables inline ECC for the entire region of the DDR.

Priming with BIST Engine
------------------------
Expand All @@ -73,8 +116,8 @@ the absence of which it resorts to enabling for the entire DDR region:
.. code-block:: dts

inline_ecc: protected@9e780000 {
device_type = "ecc";
reg = <0x9e780000 0x0080000>;
bootph-all;
device_type = "ecc";
reg = <0x9e780000 0x0080000>;
bootph-all;
};

72 changes: 54 additions & 18 deletions source/linux/Foundational_Components/U-Boot/UG-DDRSS.rst
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#########
DDRSS ECC
#########
###
DDR
###

********
Overview
********

The DDR subsystem (DDRSS) comprises DDR controller, DDR PHY and wrapper logic
to integrate these blocks in the device. For SDRAM data integrity, the DDRSS
bridge supports inline ECC on the data written to or read from the SDRAM. ECC
is stored together with the data so that a dedicated SDRAM device for ECC is
not required. The 8-bit single error correction double error detection (SECDED)
ECC data is calculated over 64-bit data quanta. For every 256-byte data block
32 bytes of ECC is stored inline. Thus 1/9th of the total SDRAM space is used
for ECC storage and the remaining 8/9th of the SDRAM data space are seen as
consecutive byte addresses. Even if there are non-ECC protected regions the
previously described 1/9th-8/9th rule still applies and consecutive byte
addresses are seen from system point of view. |__PART_FAMILY_DEVICE_NAMES__|
supports up to 3 ECC protected non-overlapping memory ranges. The current
U-Boot release supports a single region covering the entire SDRAM space.
The DDR subsystem (DDRSS) comprises DDR controller, DDR PHY and wrapper logic to
integrate these blocks in the device. The K3 DDRSS driver
(:file:`drivers/ram/k3-ddrss/k3-ddrss.c`) runs during the R5 SPL stage and is
responsible for initializing and configuring the DDR subsystem.

.. _ddr-init:

******************
DDR Initialization
******************

The driver utilizes an auto-generated configuration file containing the
necessary settings for the DDR. It configures the frequency, timing parameters,
training algorithms etc. for DDR initialization. The configuration DTSI can be
generated using the `Sysconfig tool <https://dev.ti.com/sysconfig>`_ and
selecting the software product as "DDR Configuration for \*" as well as the
required device.

.. _ddr-temperature-monitoring-uboot:

**************************
DDR Temperature Monitoring
**************************

For enabling temperature polling in the DDR subsystem the configuration DTSI
(see :ref:`ddr-init`) must be regenerated after selecting 'Yes'
for LPDDR > DDRSS x > Enable DRAM Temperature Polling and also changing the DRAM
Timing Parameters as prompted by the tool.

The kernel DDR driver utilizes this polling feature to provide base support for
dynamic DDR refresh rate changes (see :ref:`ddr-temperature-monitoring-linux`)

***************************
Error Correction Code (ECC)
***************************

For SDRAM data integrity, the DDRSS bridge supports inline ECC on the data
written to or read from the SDRAM. ECC is stored together with the data so that
a dedicated SDRAM device for ECC is not required. The 8-bit single error
correction double error detection (SECDED) ECC data is calculated over 64-bit
data quanta. For every 256-byte data block 32 bytes of ECC is stored inline.
Thus 1/9th of the total SDRAM space is used for ECC storage and the remaining
8/9th of the SDRAM data space are seen as consecutive byte addresses. Even if
there are non-ECC protected regions the previously described 1/9th-8/9th rule
still applies and consecutive byte addresses are seen from system point of view.

|__PART_FAMILY_DEVICE_NAMES__| supports up to 3 ECC protected non-overlapping
memory ranges. The current U-Boot release supports a single region covering the
entire SDRAM space.

ECC is calculated for all accesses that are within the address ranges
protected by it. 1-bit error is correctable by ECC, but multi-bit and
Expand All @@ -38,8 +74,8 @@ three ways to handle it:
Options 1 and 2 doesn't report the reason. So, if there is a need to report
the reason behind uncorrectable error handle it the third way.

DDRSS ECC handling
==================
ECC Handling
============

.. note::

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1 change: 1 addition & 0 deletions source/linux/Foundational_Components_Kernel_Drivers.rst
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Expand Up @@ -15,6 +15,7 @@ Kernel Drivers
Foundational_Components/Kernel/Kernel_Drivers/MCAN
Foundational_Components/Kernel/Kernel_Drivers/MCRC64
Foundational_Components/Kernel/Kernel_Drivers/DCAN
Foundational_Components/Kernel/Kernel_Drivers/DDR
Foundational_Components/Kernel/Kernel_Drivers/Display/DSS
Foundational_Components/Kernel/Kernel_Drivers/Display/DSS7
Foundational_Components/Kernel/Kernel_Drivers/Display/LCDC
Expand Down
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