Public bug reported:
SRU Justification:
[Impact]
Reading SMBus or I2C block data on Bluefield will fail if the target device
requires repeated start conditions to be used. This support has been added on
Ubuntu Jammy for 22.04, but is missing on Ubuntu Noble 24.04 release. Port the
patches that were accepted into upstream linux-next kernel branch for Ubuntu
24.04.
[Fix]
* Add support for repeated start conditions to the Mellanox I2C driver.
* Enable repeated start condition for I2C_FUNC_SMBUS_WRITE_I2C_BLOCK read
implementation.
* Update I2C bus timing settings based on latest HW testing results. Required
for repeated start transactions with Bluefield 3 target devices.
[Test Case]
* Verified MLXBF I2C driver builds and loads without errors on Bluefield 2 and
Bluefield 3.
* Verified I2C block read of a device that requires repeated start conditions
succeeds using the following command: "i2cget -y <bus> <target> <reg> i
<bytes>".
* Verified IPMB communication with BMC to regression test general I2C behavior.
Used to following command which will result in several I2C transactions:
"ipmitool mc info".
[Regression Potential]
* I2C bus timing settings have been updated and will affect all I2C and SMBus
transactions on Bluefield.
* SMBus I2C block reads now include a repeated start condition which could
cause a regression if this type of read is expected to be used with a target
device that does not support repeated start conditions.
* IPMB transactions that use I2C could fail due to a bug with this
implementation.
** Affects: linux-bluefield (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
SRU Justification:
[Impact]
- Reading SMBus or I2C block data on Bluefield will fail if the target
- device requires repeated start conditions to be used. This support has
- been added on Ubuntu Jammy for 22.04, but is missing on Ubuntu noble
- 24.04 release.
+ Reading SMBus or I2C block data on Bluefield will fail if the target device
requires repeated start conditions to be used. This support has been added on
Ubuntu Jammy for 22.04, but is missing on Ubuntu Noble 24.04 release. Port the
+ patches that were accepted into upstream linux-next kernel branch for Ubuntu
24.04.
[Fix]
* Add support for repeated start conditions to the Mellanox I2C driver.
* Enable repeated start condition for I2C_FUNC_SMBUS_WRITE_I2C_BLOCK read
implementation.
* Update I2C bus timing settings based on latest HW testing results. Required
for repeated start transactions with Bluefield 3 target devices.
[Test Case]
* Verified MLXBF I2C driver builds and loads without errors on Bluefield 2
and Bluefield 3.
* Verified I2C block read of a device that requires repeated start conditions
succeeds using the following command: "i2cget -y <bus> <target> <reg> i
<bytes>".
* Verified IPMB communication with BMC to regression test general I2C
behavior. Used to following command which will result in several I2C
transactions: "ipmitool mc info".
[Regression Potential]
* I2C bus timing settings have been updated and will affect all I2C and SMBus
transactions on Bluefield.
* SMBus I2C block reads now include a repeated start condition which could
cause a regression if this type of read is expected to be used with a target
device that does not support repeated start conditions.
* IPMB transactions that use I2C could fail due to a bug with this
implementation.
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https://bugs.launchpad.net/bugs/2115650
Title:
i2c-mlxbf: SMBus Repeated Start Support Missing on Ubuntu 24.04
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