diff options
| author |   Wesley Cheng <quic_wcheng@quicinc.com> | 2022-03-15 18:13:58 -0700 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-18 12:58:46 +0100 |
| commit | 0066472de157439d58454f4a55786f1045ea5681 (patch) | |
| tree | e5adba36d25b6f4c7726a1a3a65422aa97a15381 /drivers/usb/dwc3/gadget.c | |
| parent | usb: gadget: Makefile: remove ccflags-y (diff) | |
| download | linux-dev-0066472de157439d58454f4a55786f1045ea5681.tar.xz linux-dev-0066472de157439d58454f4a55786f1045ea5681.zip | |
usb: dwc3: Issue core soft reset before enabling run/stop
It is recommended by the Synopsis databook to issue a DCTL.CSftReset
when reconnecting from a device-initiated disconnect routine. This
resolves issues with enumeration during fast composition switching
cases, which result in an unknown device on the host.
Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20220316011358.3057-1-quic_wcheng@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 2a96826b7efd..ab725d2262d6 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2578,6 +2578,17 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) dwc->ev_buf->length; } } else { + /* + * In the Synopsys DWC_usb31 1.90a programming guide section + * 4.1.9, it specifies that for a reconnect after a + * device-initiated disconnect requires a core soft reset + * (DCTL.CSftRst) before enabling the run/stop bit. + */ + spin_unlock_irqrestore(&dwc->lock, flags); + dwc3_core_soft_reset(dwc); + spin_lock_irqsave(&dwc->lock, flags); + + dwc3_event_buffers_setup(dwc); __dwc3_gadget_start(dwc); } |