| From b3addcf0d1f04f53fcc302577d5a5e964c18531a Mon Sep 17 00:00:00 2001 |
| From: Bin Liu <b-liu@ti.com> |
| Date: Thu, 25 May 2017 13:42:39 -0500 |
| Subject: usb: musb: dsps: keep VBUS on for host-only mode |
| |
| 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 */ |
