Re: [PATCH v3] e1000e: Increase iteration on polling MDIC ready bit

[Andrew Lunn]

On Fri, Sep 25, 2020 at 12:45:42AM +0800, Kai-Heng Feng wrote:
> We are seeing the following error after S3 resume:
> [  704.746874] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
> [  704.844232] e1000e 0000:00:1f.6 eno1: MDI Write did not complete
> [  704.902817] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
> [  704.903075] e1000e 0000:00:1f.6 eno1: reading PHY page 769 (or 0x6020 shifted) reg 0x17
> [  704.903281] e1000e 0000:00:1f.6 eno1: Setting page 0x6020
> [  704.903486] e1000e 0000:00:1f.6 eno1: writing PHY page 769 (or 0x6020 shifted) reg 0x17
> [  704.943155] e1000e 0000:00:1f.6 eno1: MDI Error
> ...
> [  705.108161] e1000e 0000:00:1f.6 eno1: Hardware Error
> 
> As Andrew Lunn pointed out, MDIO has nothing to do with phy, and indeed
> increase polling iteration can resolve the issue.
> 
> The root cause is quite likely Intel ME, since it's a blackbox to the
> kernel so the only approach we can take is to be patient and wait
> longer.

Please could you explain how you see Intel ME being responsible for
this. I'm not convinced.

      Andrew