| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 11/60] usb: musb: dsps: keep VBUS on for host-only mode | Date | Mon, 19 Jun 2017 23:17:05 +0800 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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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>
--- drivers/usb/musb/musb_dsps.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/usb/musb/musb_dsps.c +++ b/drivers/usb/musb/musb_dsps.c @@ -213,6 +213,12 @@ static int dsps_check_status(struct musb msecs_to_jiffies(wrp->poll_timeout)); break; case OTG_STATE_A_WAIT_BCON: + /* keep VBUS on for host-only mode */ + if (musb->port_mode == MUSB_PORT_MODE_HOST) { + mod_timer(&glue->timer, jiffies + + msecs_to_jiffies(wrp->poll_timeout)); + break; + } musb_writeb(musb->mregs, MUSB_DEVCTL, 0); skip_session = 1; /* fall */
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