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imx8mp:dual-espresso: Fix instabilities with 100Mbps/Full connections

Tim Jaacks requested to merge fix_ethernet_instabilities_imx8mp into linux-5.10.9-guf

If energy efficiency mode is enabled and the device is operating in 100M full duplex mode, this causes instability for certain remote hardware. Sporadic symptoms are:

  • packet loss
  • bad ping times
  • CPU stalls Disabled the energy efficiency mode for 100M.

BCS 746-000624

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