Suspend the MAC in a PHY

  1. Set the PowerSavingControlBits bit 26 and calculate bit 25

  2. Unset bit 0 in MMIO offset 0x120

  3. Do a dummy read on MMIO offset 0x128

  4. Spinwait until the "Ready" bit is set in the General Interrupt (MMIO offset 0x128) is set (up to 35 mSec, check every 10 uSec)

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