diff options
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 0288ea99c85a..161a6bfcb84e 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2228,6 +2228,18 @@ static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force) * * - Issue EndTransfer WITH CMDIOC bit set * - Wait 100us + * + * As of IP version 3.10a of the DWC_usb3 IP, the controller + * supports a mode to work around the above limitation. The + * software can poll the CMDACT bit in the DEPCMD register + * after issuing a EndTransfer command. This mode is enabled + * by writing GUCTL2[14]. This polling is already done in the + * dwc3_send_gadget_ep_cmd() function so if the mode is + * enabled, the EndTransfer command will have completed upon + * returning from this function and we don't need to delay for + * 100us. + * + * This mode is NOT available on the DWC_usb31 IP. */ cmd = DWC3_DEPCMD_ENDTRANSFER; @@ -2239,7 +2251,9 @@ static void dwc3_stop_active_transfer(struct dwc3 *dwc, u32 epnum, bool force) WARN_ON_ONCE(ret); dep->resource_index = 0; dep->flags &= ~DWC3_EP_BUSY; - udelay(100); + + if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A) + udelay(100); } static void dwc3_stop_active_transfers(struct dwc3 *dwc) |