• Petri Gynther's avatar
    net: bcmgenet: enable MoCA link state change detection · 8d88c6eb
    Petri Gynther authored
    Currently, MoCA fixed PHYs are always in link-up state, regardless of
    whether the link is actually up or not.
    
    Add code to properly detect MoCA link state changes and to reflect the
    new state in MoCA fixed PHY. Only GENET V3 and V4 MACs are capable of
    detecting MoCA link state changes.
    
    The code works as follows:
    1. GENET MAC detects MoCA link state change and issues UMAC_IRQ_LINK_UP
       or UMAC_IRQ_LINK_DOWN interrupt.
    2. Link up/down interrupt is processed in bcmgenet_irq_task(), which
       calls phy_mac_interrupt().
    3. phy_mac_interrupt() updates the fixed PHY phydev->link and kicks
       the PHY state machine.
    4. PHY state machine proceeds to read the fixed PHY link status
       register.
    5. When the fixed PHY link status register is being read, the new
       function bcmgenet_fixed_phy_link_update() gets called. It copies
       the fixed PHY phydev->link value to the fixed PHY status->link.
    6. PHY state machine receives the new link state of the fixed PHY.
    7. MoCA fixed PHY link state now correctly reflects the real MoCA
       hardware link state.
    Signed-off-by: default avatarPetri Gynther <pgynther@google.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    8d88c6eb
bcmgenet.c 87.3 KB