blob: a152ccd108a55a43c2273b81dd2bbb05fd50c59e [file] [log] [blame]
From 91607cfaf10816e2646ff94873c94a0c382db42f Mon Sep 17 00:00:00 2001
From: Bin Liu <>
Date: Sun, 24 May 2020 21:50:45 -0500
Subject: [PATCH] usb: musb: start session in resume for host port
commit 7f88a5ac393f39319f69b8b20cc8d5759878d1a1 upstream.
Commit 17539f2f4f0b ("usb: musb: fix enumeration after resume") replaced
musb_start() in musb_resume() to not override softconnect bit, but it
doesn't restart the session for host port which was done in musb_start().
The session could be disabled in musb_suspend(), which leads the host
port doesn't stay in host mode.
So let's start the session specifically for host port in musb_resume().
Fixes: 17539f2f4f0b ("usb: musb: fix enumeration after resume")
Signed-off-by: Bin Liu <>
Signed-off-by: Greg Kroah-Hartman <>
Signed-off-by: Paul Gortmaker <>
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 46c39ba50550..2e97abe51556 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2738,6 +2738,13 @@ static int musb_resume(struct device *dev)
+ /* session might be disabled in suspend */
+ if (musb->port_mode == MUSB_HOST &&
+ !(musb->ops->quirks & MUSB_PRESERVE_SESSION)) {
+ musb_writeb(musb->mregs, MUSB_DEVCTL, devctl);
+ }
spin_lock_irqsave(&musb->lock, flags);
error = musb_run_resume_work(musb);
if (error)