• Sergei Shtylyov's avatar
    EHCI: only power off port if over-current is active · 81463c1d
    Sergei Shtylyov authored
    MAX4967 USB power supply chip we use on our boards signals over-current when
    power is not enabled; once it's enabled, over-current signal returns to normal.
    That unfortunately caused the endless stream of "over-current change on port"
    messages. The EHCI root hub code reacts on every over-current signal change
    with powering off the port -- such change event is generated the moment the
    port power is enabled, so once enabled the power is immediately cut off.
    I think we should only cut off power when we're seeing the active over-current
    signal, so I'm adding such check to that code. I also think that the fact that
    we've cut off the port power should be reflected in the result of GetPortStatus
    request immediately, hence I'm adding a PORTSCn register readback after write...
    Signed-off-by: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
    Cc: stable@kernel.org
    Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
    81463c1d
ehci-hub.c 29.2 KB