From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:42756 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752600AbdFSP2S (ORCPT ); Mon, 19 Jun 2017 11:28:18 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Moreno Bartalucci , Tony Lindgren , Bin Liu 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 Message-Id: <20170619151645.093817067@linuxfoundation.org> In-Reply-To: <20170619151644.680979056@linuxfoundation.org> References: <20170619151644.680979056@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Bin Liu 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 Acked-by: Tony Lindgren Signed-off-by: Bin Liu Signed-off-by: Greg Kroah-Hartman --- 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 */