This is a note to let you know that I've just added the patch titled
usb: chipidea: udc: don't touch DP when controller is in host mode
to the 4.4-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-chipidea-udc-don-t-touch-dp-when-controller-is-in-host-mode.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c4e94174983a86c935be1537a73e496b778b0287 Mon Sep 17 00:00:00 2001
From: Li Jun <jun.li@xxxxxxx>
Date: Tue, 16 Aug 2016 19:19:11 +0800
Subject: usb: chipidea: udc: don't touch DP when controller is in host mode
From: Li Jun <jun.li@xxxxxxx>
commit c4e94174983a86c935be1537a73e496b778b0287 upstream.
When the controller is configured to be dual role and it's in host mode,
if bind udc and gadgt driver, those gadget operations will do gadget
disconnect and finally pull down DP line, which will break host function.
Signed-off-by: Li Jun <jun.li@xxxxxxx>
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/chipidea/udc.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1585,8 +1585,11 @@ static int ci_udc_pullup(struct usb_gadg
{
struct ci_hdrc *ci = container_of(_gadget, struct ci_hdrc, gadget);
- /* Data+ pullup controlled by OTG state machine in OTG fsm mode */
- if (ci_otg_is_fsm_mode(ci))
+ /*
+ * Data+ pullup controlled by OTG state machine in OTG fsm mode;
+ * and don't touch Data+ in host mode for dual role config.
+ */
+ if (ci_otg_is_fsm_mode(ci) || ci->role == CI_ROLE_HOST)
return 0;
pm_runtime_get_sync(&ci->gadget.dev);
Patches currently in stable-queue which might be from jun.li@xxxxxxx are
queue-4.4/usb-chipidea-udc-don-t-touch-dp-when-controller-is-in-host-mode.patch
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