linux-kernel - [PATCH] usb-musb: keep VBUS on when device is disconnected

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Message-Id: <20170315140801.97230-1-moreno.bartalucci@tecnorama.it>
Date:   Wed, 15 Mar 2017 15:08:01 +0100
From:   Moreno Bartalucci <moreno.bartalucci@...norama.it>
To:     Bin Liu <b-liu@...com>
Cc:     linux-omap@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Alessio Igor Bogani <abogani@...nel.org>,
        Moreno Bartalucci <moreno.bartalucci@...norama.it>
Subject: [PATCH] usb-musb: keep VBUS on when device is disconnected

With usb-musb port in host mode, when the device
is disconnected, either logically (because of a mode switch) or
physically (by pulling the cable), the USB port should keep
suppling VBUS, with no interruption, to prevent power loss on
USB powered devices.

Signed-off-by: Moreno Bartalucci <moreno.bartalucci@...norama.it>
---
 drivers/usb/musb/musb_dsps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_dsps.c b/drivers/usb/musb/musb_dsps.c
index 7c047c4..5d9986b 100644
--- a/drivers/usb/musb/musb_dsps.c
+++ b/drivers/usb/musb/musb_dsps.c
@@ -245,7 +245,7 @@ static int dsps_check_status(struct musb *musb, void *unused)
 		dsps_mod_timer_optional(glue);
 		break;
 	case OTG_STATE_A_WAIT_BCON:
-		musb_writeb(musb->mregs, MUSB_DEVCTL, 0);
+		musb_writeb(musb->mregs, MUSB_DEVCTL, MUSB_DEVCTL_SESSION);
 		skip_session = 1;
 		/* fall */
 
-- 
2.10.1 (Apple Git-78)