APPLIED: [SRU][N:linux-bluefield][PATCH v1 0/2] UBUNTU: SAUCE: i2c-mlxbf: Repeated start support

[Kuba Pawlak]

On 1.07.2025 15:13, Chris Babroski wrote:
> BugLink: https://bugs.launchpad.net/bugs/2115650
>
> [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.
>
> Chris Babroski (2):
>    [SRU][N:linux-bluefield][PATCH v1 1/2] UBUNTU: SAUCE: i2c-mlxbf:
>      Repeated start support
>    [SRU][N:linux-bluefield][PATCH v1 2/2] UBUNTU: SAUCE: i2c-mlxbf:
>      Improve I2C bus timing configuration
>
>   drivers/i2c/busses/i2c-mlxbf.c | 68 +++++++++++++++++++++-------------
>   1 file changed, 42 insertions(+), 26 deletions(-)
>
Applied-by: Kuba Pawlak <kuba.pawlak at canonical.com>
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