From: John Stultz <john.stultz@linaro.org>
To: lkml <linux-kernel@vger.kernel.org>
Cc: Chen Yu <chenyu56@huawei.com>, Wei Xu <xuwei5@hisilicon.com>,
Guodong Xu <guodong.xu@linaro.org>,
Amit Pundir <amit.pundir@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
John Youn <johnyoun@synopsys.com>,
Douglas Anderson <dianders@chromium.org>,
Felipe Balbi <felipe.balbi@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, John Stultz <john.stultz@linaro.org>
Subject: [RFC][PATCH 3/3 v2] usb: dwc2: Force port resume on switching to device mode
Date: Tue, 6 Dec 2016 00:06:22 -0800 [thread overview]
Message-ID: <1481011582-7162-4-git-send-email-john.stultz@linaro.org> (raw)
In-Reply-To: <1481011582-7162-1-git-send-email-john.stultz@linaro.org>
From: Chen Yu <chenyu56@huawei.com>
We've seen failures when switching between host and gadget mode,
which was diagnosed as being caused due to the bus being
auto-suspended when we switched.
So this patch forces a port resume when switching to device
mode if the bus is suspended.
Cc: Wei Xu <xuwei5@hisilicon.com>
Cc: Guodong Xu <guodong.xu@linaro.org>
Cc: Amit Pundir <amit.pundir@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: John Youn <johnyoun@synopsys.com>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Chen Yu <chenyu56@huawei.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Chen Yu <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
drivers/usb/dwc2/hcd.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 75ddfa3..0221534 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -55,6 +55,9 @@
#include "core.h"
#include "hcd.h"
+
+static void dwc2_port_resume(struct dwc2_hsotg *hsotg);
+
/*
* =========================================================================
* Host Core Layer Functions
@@ -3205,6 +3208,11 @@ static void dwc2_conn_id_status_change(struct work_struct *work)
if (gotgctl & GOTGCTL_CONID_B) {
/* Wait for switch to device mode */
dev_dbg(hsotg->dev, "connId B\n");
+ if (hsotg->bus_suspended) {
+ dev_info(hsotg->dev,
+ "Do port resume before switching to device mode\n");
+ dwc2_port_resume(hsotg);
+ }
while (!dwc2_is_device_mode(hsotg)) {
dev_info(hsotg->dev,
"Waiting for Peripheral Mode, Mode=%s\n",
--
2.7.4
prev parent reply other threads:[~2016-12-06 8:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-06 8:06 [RFC][PATCH 0/3 v2] Try to connect HiKey's usb extcon to dwc2 driver John Stultz
2016-12-06 8:06 ` [RFC][PATCH 1/3 v2] usb: dwc2: Add extcon support " John Stultz
2016-12-06 23:17 ` John Youn
2016-12-07 0:04 ` John Stultz
2016-12-07 0:26 ` John Youn
2016-12-07 0:35 ` John Stultz
2016-12-07 1:44 ` John Stultz
2016-12-07 3:54 ` Chanwoo Choi
2016-12-07 4:13 ` John Stultz
2016-12-06 8:06 ` [RFC][PATCH 2/3 v2] usb: dwc2: Avoid suspending if we're in gadget mode John Stultz
2016-12-06 8:06 ` John Stultz [this message]
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