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authorBin Liu <b-liu@ti.com>2017-05-25 21:42:39 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-05-27 12:54:46 +0300
commitb3addcf0d1f04f53fcc302577d5a5e964c18531a (patch)
tree0cc8dc545fb8b7a0224f9ac4f176b5f57ef7e558 /drivers/usb/musb/musb_dsps.c
parent8b77b0cfa99edbc4993139aab7592a2315c7bff4 (diff)
downloadlinux-b3addcf0d1f04f53fcc302577d5a5e964c18531a.tar.xz
usb: musb: dsps: keep VBUS on for host-only mode
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") Cc: stable@vger.kernel.org #v4.11 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>
Diffstat (limited to 'drivers/usb/musb/musb_dsps.c')
-rw-r--r--drivers/usb/musb/musb_dsps.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 9c7ee26ef388..bc6a9be2ccc5 100644
--- 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 *musb, void *unused)
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 */