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.
[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
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https://bugs.launchpad.net/bugs/2086815
Title:
i2c-mlxbf: SMBus Repeated Start Support
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