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DP83825I: Active sleep & low power mode does not turn on when the cable is disconnected

Ruslan Gnezdilov
Prodigy 10 points
Part Number: DP83825I

Tool/software:

Hello. Why is Low Power Mode and Sleep not enabled by default on this PHY? I understand that they are also not turned on by the driver. But it works if you force the 0x11 register to be written to bits.
How can I enable support for this mode in Linux drivers so that it is active by default?

  • +1
    TI__Mastermind 24988 points

    Hi Ruslan,

    This is not enabled by default to avoid any issues with SoC dependency on PHY peripherals (e.g. output clocks) for SW state machines to pass on start-up. This is application dependent and not always required - enabling by default may be acceptable.

    You can enable this by default by adding appropriate phy_write to dp83822_config_init function in driver:

    phy_write_mmd(phydev, DP83822_DEVADDR, MII_DP83822_PHYSCR, value); // may need to be masked with default bits to avoid overwriting other fields in reg

    Thank you,
    Evan