• Matt Carlson's avatar
    tg3: Use constant 500KHz MI clock on adapters with a CPMU · 8ef21428
    Matt Carlson authored
    The MI clock is not configured correctly on adapters with the CPMU
    present.  The tg3 driver has code which statically sets the MI clock to
    be a fraction of the speed at which the core clock is running.
    However, the CPMU can change the adapter's core clock frequency based
    on operating conditions.  Consequently, the MI will run slow when the
    core's clock has been slowed down.
    There is a new 500KHz constant frequency clock available on adapters
    with a CPMU.  This patch removes the static core clock scaling and
    configures the MI clock to use this new 500KHz clock instead.
    Running the MI clock at slower speeds will not directly result in data
    corruption, but it does challenge the PHY read and write routine timeouts.
    Signed-off-by: default avatarMatt Carlson <mcarlson@broadcom.com>
    Signed-off-by: default avatarMichael Chan <mchan@broadcom.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>