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    Subject[PATCH 4.11 077/150] usb: musb: dsps: keep VBUS on for host-only mode
    Date
    4.11-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Bin Liu <b-liu@ti.com>

    commit b3addcf0d1f04f53fcc302577d5a5e964c18531a upstream.

    Currently VBUS is turned off while a usb device is detached, and turned
    on again by the polling routine. This short period VBUS loss prevents
    usb modem to switch mode.

    VBUS should be constantly on for host-only mode, so this changes the
    driver to not turn off VBUS for host-only mode.

    Fixes: 2f3fd2c5bde1 ("usb: musb: Prepare dsps glue layer for PM runtime support")
    Reported-by: Moreno Bartalucci <moreno.bartalucci@tecnorama.it>
    Acked-by: Tony Lindgren <tony@atomide.com>
    Signed-off-by: Bin Liu <b-liu@ti.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/musb/musb_dsps.c | 5 +++++
    1 file changed, 5 insertions(+)

    --- a/drivers/usb/musb/musb_dsps.c
    +++ b/drivers/usb/musb/musb_dsps.c
    @@ -245,6 +245,11 @@ static int dsps_check_status(struct musb
    dsps_mod_timer_optional(glue);
    break;
    case OTG_STATE_A_WAIT_BCON:
    + /* keep VBUS on for host-only mode */
    + if (musb->port_mode == MUSB_PORT_MODE_HOST) {
    + dsps_mod_timer_optional(glue);
    + break;
    + }
    musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
    skip_session = 1;
    /* fall */

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