e1000e: Workaround for sporadic MDI error on Meteor Lake systems

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[ Upstream commit 6dbdd4de03 ]

On some Meteor Lake systems accessing the PHY via the MDIO interface may
result in an MDI error. This issue happens sporadically and in most cases
a second access to the PHY via the MDIO interface results in success.

As a workaround, introduce a retry counter which is set to 3 on Meteor
Lake systems. The driver will only return an error if 3 consecutive PHY
access attempts fail. The retry mechanism is disabled in specific flows,
where MDI errors are expected.

Fixes: cc23f4f0b6 ("e1000e: Add support for Meteor Lake")
Suggested-by: Nikolay Mushayev <nikolay.mushayev@intel.com>
Co-developed-by: Nir Efrati <nir.efrati@intel.com>
Signed-off-by: Nir Efrati <nir.efrati@intel.com>
Signed-off-by: Vitaly Lifshits <vitaly.lifshits@intel.com>
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Vitaly Lifshits 2024-01-04 16:16:52 +02:00 • committed by Greg Kroah-Hartman

parent d5752c7bb1

commit 1d16cd91cd

4 changed files with 150 additions and 69 deletions

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2

drivers/net/ethernet/intel/e1000e/hw.h

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33

drivers/net/ethernet/intel/e1000e/ich8lan.c

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184

drivers/net/ethernet/intel/e1000e/phy.c

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2

drivers/net/ethernet/intel/e1000e/phy.h

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