usb: dwc3: gadget: Remove END_TRANSFER delay
We had a 100us delay to synchronize the END_TRANSFER command completion before giving back requests to the function drivers. Now, the controller driver can handle cancelled TRBs with the requests' cancelled_list and it can also wait until the END_TRANSFER completion before starting new transfers. Synchronization can simply base on the controller's command completion interrupt. The 100us delay is no longer needed. Remove this arbitrary delay. Signed-off-by: Thinh Nguyen <thinhn@synopsys.com> Signed-off-by: Felipe Balbi <balbi@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -2693,7 +2693,6 @@ static void dwc3_reset_gadget(struct dwc3 *dwc)
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static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
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bool interrupt)
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{
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struct dwc3 *dwc = dep->dwc;
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struct dwc3_gadget_ep_cmd_params params;
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u32 cmd;
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int ret;
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@ -2709,16 +2708,13 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
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* much trouble synchronizing between us and gadget driver.
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*
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* We have discussed this with the IP Provider and it was
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* suggested to giveback all requests here, but give HW some
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* extra time to synchronize with the interconnect. We're using
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* an arbitrary 100us delay for that.
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* suggested to giveback all requests here.
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*
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* Note also that a similar handling was tested by Synopsys
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* (thanks a lot Paul) and nothing bad has come out of it.
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* In short, what we're doing is:
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*
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* - Issue EndTransfer WITH CMDIOC bit set
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* - Wait 100us
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* In short, what we're doing is issuing EndTransfer with
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* CMDIOC bit set and delay kicking transfer until the
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* EndTransfer command had completed.
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*
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* As of IP version 3.10a of the DWC_usb3 IP, the controller
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* supports a mode to work around the above limitation. The
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@ -2727,8 +2723,7 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
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* by writing GUCTL2[14]. This polling is already done in the
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* dwc3_send_gadget_ep_cmd() function so if the mode is
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* enabled, the EndTransfer command will have completed upon
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* returning from this function and we don't need to delay for
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* 100us.
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* returning from this function.
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*
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* This mode is NOT available on the DWC_usb31 IP.
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*/
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@ -2746,9 +2741,6 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
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dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
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else
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dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
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if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A)
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udelay(100);
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}
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static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
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