This is a note to let you know that I've just added the patch titled
usb: dwc2: Make sure we disconnect the gadget state
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-dwc2-make-sure-we-disconnect-the-gadget-state.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Sun Mar 18 16:55:33 CET 2018
From: John Stultz <john.stultz@xxxxxxxxxx>
Date: Mon, 13 Feb 2017 20:08:08 -0800
Subject: usb: dwc2: Make sure we disconnect the gadget state
From: John Stultz <john.stultz@xxxxxxxxxx>
[ Upstream commit dad3f793f20fbb5c0c342f0f5a0bdf69a4d76089 ]
I had seen some odd behavior with HiKey's usb-gadget interface
that I finally seemed to have chased down. Basically every other
time I plugged in the OTG port, the gadget interface would
properly initialize. The other times, I'd get a big WARN_ON
in dwc2_hsotg_init_fifo() about the fifo_map not being clear.
Ends up if we don't disconnect the gadget state, the fifo-map
doesn't get cleared properly, which causes WARN_ON messages and
also results in the device not properly being setup as a gadget
every other time the OTG port is connected.
So this patch adds a call to dwc2_hsotg_disconnect() in the
reset path so the state is properly cleared.
With it, the gadget interface initializes properly on every
plug in.
Cc: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Cc: Guodong Xu <guodong.xu@xxxxxxxxxx>
Cc: Amit Pundir <amit.pundir@xxxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: John Youn <johnyoun@xxxxxxxxxxxx>
Cc: Douglas Anderson <dianders@xxxxxxxxxxxx>
Cc: Chen Yu <chenyu56@xxxxxxxxxx>
Cc: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
Acked-by: John Youn <johnyoun@xxxxxxxxxxxx>
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc2/hcd.c | 1 +
1 file changed, 1 insertion(+)
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -3220,6 +3220,7 @@ static void dwc2_conn_id_status_change(s
dwc2_core_init(hsotg, false);
dwc2_enable_global_interrupts(hsotg);
spin_lock_irqsave(&hsotg->lock, flags);
+ dwc2_hsotg_disconnect(hsotg);
dwc2_hsotg_core_init_disconnected(hsotg, false);
spin_unlock_irqrestore(&hsotg->lock, flags);
dwc2_hsotg_core_connect(hsotg);
Patches currently in stable-queue which might be from john.stultz@xxxxxxxxxx are
queue-4.9/usb-dwc2-make-sure-we-disconnect-the-gadget-state.patch
queue-4.9/sysrq-reset-the-watchdog-timers-while-displaying-high-resolution-timers.patch
queue-4.9/timers-sched_clock-update-timeout-for-clock-wrap.patch