Public bug reported:
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.
** Affects: linux-bluefield (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2086791
Title:
mlxbf-gige: Support workaround for MDIO GPIO degradation bug
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