diff options
| author | Chen Yu <chenyu56@huawei.com> | 2017-01-23 23:59:57 +0100 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2017-01-24 15:19:09 +0100 |
| commit | 9156a7ef1c3ba482f85f2733edcde2b10189de8c (patch) | |
| tree | 219460a6883bb17bfe567f892014df04954ff534 /drivers/usb/dwc2 | |
| parent | usb: dwc2: Workaround case where GOTGCTL state is wrong (diff) | |
| download | linux-9156a7ef1c3ba482f85f2733edcde2b10189de8c.tar.xz linux-9156a7ef1c3ba482f85f2733edcde2b10189de8c.zip | |
usb: dwc2: Force port resume on switching to device mode
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: Vardan Mikayelyan <mvardan@synopsys.com>
Cc: Kishon Vijay Abraham I <kishon@ti.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>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc2')
| -rw-r--r-- | drivers/usb/dwc2/hcd.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index e0d152f2c81b..1f670c3429a6 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -54,6 +54,8 @@ #include "core.h" #include "hcd.h" +static void dwc2_port_resume(struct dwc2_hsotg *hsotg); + /* * ========================================================================= * Host Core Layer Functions @@ -3231,6 +3233,11 @@ 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", |