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Commit b3addcf0 authored by Bin Liu's avatar Bin Liu Committed by Greg Kroah-Hartman
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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: 2f3fd2c5 ("usb: musb: Prepare dsps glue layer for PM runtime support")
Cc: stable@vger.kernel.org #v4.11
Reported-by: default avatarMoreno Bartalucci <moreno.bartalucci@tecnorama.it>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarBin Liu <b-liu@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8b77b0cf

drivers/usb/musb/musb_dsps.c

+5 −0
Original line number Diff line number Diff line
@@ -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 */