This is a note to let you know that I've just added the patch titled
usb: gadget: udc: atmel: set vbus irqflags explicitly
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-gadget-udc-atmel-set-vbus-irqflags-explicitly.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 6baeda120d90aa637b08f7604de104ab00ce9126 Mon Sep 17 00:00:00 2001
From: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Date: Thu, 31 Aug 2017 14:51:40 +0200
Subject: usb: gadget: udc: atmel: set vbus irqflags explicitly
From: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
commit 6baeda120d90aa637b08f7604de104ab00ce9126 upstream.
The driver triggers actions on both edges of the vbus signal.
The former PIO controller was triggering IRQs on both falling and rising edges
by default. Newer PIO controller don't, so it's better to set it explicitly to
IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING.
Without this patch we may trigger the connection with host but only on some
bouncing signal conditions and thus lose connecting events.
Acked-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxxxxxx>
Signed-off-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/gadget/udc/atmel_usba_udc.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/usb/gadget/udc/atmel_usba_udc.c
+++ b/drivers/usb/gadget/udc/atmel_usba_udc.c
@@ -28,6 +28,8 @@
#include <asm/gpio.h>
#include "atmel_usba_udc.h"
+#define USBA_VBUS_IRQFLAGS (IRQF_ONESHOT \
+ | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING)
#ifdef CONFIG_USB_GADGET_DEBUG_FS
#include <linux/debugfs.h>
@@ -2185,7 +2187,7 @@ static int usba_udc_probe(struct platfor
IRQ_NOAUTOEN);
ret = devm_request_threaded_irq(&pdev->dev,
gpio_to_irq(udc->vbus_pin), NULL,
- usba_vbus_irq_thread, IRQF_ONESHOT,
+ usba_vbus_irq_thread, USBA_VBUS_IRQFLAGS,
"atmel_usba_udc", udc);
if (ret) {
udc->vbus_pin = -ENODEV;
Patches currently in stable-queue which might be from nicolas.ferre@xxxxxxxxxxxxx are
queue-4.4/usb-gadget-udc-atmel-set-vbus-irqflags-explicitly.patch