ACK: [SRU][J:linux-bluefield][PATCH v2 0/1] UBUNTU: SAUCE: mlxbf-gige: Support workaround for MDIO GPIO degradation bug

[Agathe Porte]

2024-11-18 20:37 CET, Asmaa Mnebhi:
> From: asmaa <asmaa at nvidia.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/2086791
> 
> SRU Justification:
> 
> [Impact]
> 
> Once the BF3 MDIO clock is enabled by software it is expected and intended
> for it to keep toggling. BF3 has a hardware GPIO bug where constant
> toggling at "high frequencies" will lead to GPIO degradation.
> 
> [Fix]
> 
> * A workaround is to lower down the clock frequency.
> * That will increase the "life expectation" of the GPIO.
> * The lowest possible frequency we can achieve is 1.09Mhz by setting mdio_period = 0xFF.
> 
> [Test Case]
> 
> * Check if the gige driver is loaded
> * Check that the oob_net0 interface is up and operational
> * Check that the OOB gets an ip
> * Do SW reset and powercycle and check the oon_net0 interface again
> 
> [Regression Potential]
> 
> * Lowering the frequency shouldn't have any impact but it controls
> * the access to the PHY registers.
> * So do the usual OOB tests to verify that there is indeed no impact.

Acked-by: Agathe Porte <agathe.porte at canonical.com>