From: Wesley Cheng <wcheng@codeaurora.org>
To: balbi@kernel.org, gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
Wesley Cheng <wcheng@codeaurora.org>
Subject: [PATCH] usb: dwc3: gadget: Restart DWC3 gadget when enabling pullup
Date: Tue, 29 Dec 2020 15:00:37 -0800 [thread overview]
Message-ID: <1609282837-21666-1-git-send-email-wcheng@codeaurora.org> (raw)
usb_gadget_deactivate/usb_gadget_activate does not execute the UDC start
operation, which may leave EP0 disabled and event IRQs disabled when
re-activating the function. Move the enabling/disabling of USB EP0 and
device event IRQs to be performed in the pullup routine.
Fixes: ae7e86108b12 ("usb: dwc3: Stop active transfers before halting the
controller")
Tested-by: Michael Tretter <m.tretter@pengutronix.de>
Reported-by: Michael Tretter <m.tretter@pengutronix.de>
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>
---
drivers/usb/dwc3/gadget.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 5d879b7606d5..922c8b76e534 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1988,6 +1988,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
static void dwc3_gadget_disable_irq(struct dwc3 *dwc);
static void __dwc3_gadget_stop(struct dwc3 *dwc);
+static int __dwc3_gadget_start(struct dwc3 *dwc);
static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
{
@@ -2050,6 +2051,8 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on)
dwc->ev_buf->lpos = (dwc->ev_buf->lpos + count) %
dwc->ev_buf->length;
}
+ } else {
+ __dwc3_gadget_start(dwc);
}
ret = dwc3_gadget_run_stop(dwc, is_on, false);
@@ -2224,10 +2227,6 @@ static int dwc3_gadget_start(struct usb_gadget *g,
}
dwc->gadget_driver = driver;
-
- if (pm_runtime_active(dwc->dev))
- __dwc3_gadget_start(dwc);
-
spin_unlock_irqrestore(&dwc->lock, flags);
return 0;
@@ -2253,13 +2252,6 @@ static int dwc3_gadget_stop(struct usb_gadget *g)
unsigned long flags;
spin_lock_irqsave(&dwc->lock, flags);
-
- if (pm_runtime_suspended(dwc->dev))
- goto out;
-
- __dwc3_gadget_stop(dwc);
-
-out:
dwc->gadget_driver = NULL;
spin_unlock_irqrestore(&dwc->lock, flags);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next reply other threads:[~2020-12-29 23:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-29 23:00 Wesley Cheng [this message]
-- strict thread matches above, loose matches on Subject: below --
2020-11-20 0:13 [PATCH] usb: dwc3: gadget: Restart DWC3 gadget when enabling pullup Wesley Cheng
2020-11-20 15:08 ` Michael Tretter
2020-11-30 11:46 ` Michael Tretter
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