From ea53b8828c50b7a5138a8931c41b2671682c86b5 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Fri, 17 Feb 2012 12:10:04 +0200 Subject: [PATCH] usb: dwc3: gadget: don't wait for ep cmd IRQ That IRQ is causing way too much trouble. We have a different handling which was agreed with IP provider and has been tested with FPGA and OMAP5. Tested-by: Pratyush Anand Signed-off-by: Felipe Balbi --- drivers/usb/dwc3/gadget.c | 66 +++++++++++++++++++---------------------------- 1 file changed, 27 insertions(+), 39 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 056ace8..0f19978 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -555,9 +555,34 @@ static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_request *req; - if (!list_empty(&dep->req_queued)) + if (!list_empty(&dep->req_queued)) { dwc3_stop_active_transfer(dwc, dep->number); + /* + * NOTICE: We are violating what the Databook says about the + * EndTransfer command. Ideally we would _always_ wait for the + * EndTransfer Command Completion IRQ, but that's causing too + * much trouble synchronizing between us and gadget driver. + * + * We have discussed this with the IP Provider and it was + * suggested to giveback all requests here, but give HW some + * extra time to synchronize with the interconnect. We're using + * an arbitraty 100us delay for that. + * + * Note also that a similar handling was tested by Synopsys + * (thanks a lot Paul) and nothing bad has come out of it. + * In short, what we're doing is: + * + * - Issue EndTransfer WITH CMDIOC bit set + * - Wait 100us + * - giveback all requests to gadget driver + */ + udelay(100); + + req = next_request(&dep->req_queued); + dwc3_gadget_giveback(dep, req, -ESHUTDOWN); + } + while (!list_empty(&dep->request_list)) { req = next_request(&dep->request_list); @@ -1735,43 +1760,6 @@ static void dwc3_endpoint_transfer_complete(struct dwc3 *dwc, } } -static void dwc3_process_ep_cmd_complete(struct dwc3_ep *dep, - const struct dwc3_event_depevt *event) -{ - struct dwc3 *dwc = dep->dwc; - struct dwc3_event_depevt mod_ev = *event; - - /* - * We were asked to remove one request. It is possible that this - * request and a few others were started together and have the same - * transfer index. Since we stopped the complete endpoint we don't - * know how many requests were already completed (and not yet) - * reported and how could be done (later). We purge them all until - * the end of the list. - */ - mod_ev.status = DEPEVT_STATUS_LST; - dwc3_cleanup_done_reqs(dwc, dep, &mod_ev, -ESHUTDOWN); - dep->flags &= ~DWC3_EP_BUSY; - /* pending requests are ignored and are queued on XferNotReady */ -} - -static void dwc3_ep_cmd_compl(struct dwc3_ep *dep, - const struct dwc3_event_depevt *event) -{ - u32 param = event->parameters; - u32 cmd_type = (param >> 8) & ((1 << 5) - 1); - - switch (cmd_type) { - case DWC3_DEPCMD_ENDTRANSFER: - dwc3_process_ep_cmd_complete(dep, event); - break; - default: - printk(KERN_ERR "%s() unknown /unexpected type: %d\n", - __func__, cmd_type); - break; - }; -} - static void dwc3_endpoint_interrupt(struct dwc3 *dwc, const struct dwc3_event_depevt *event) { @@ -1853,7 +1841,7 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc, dev_dbg(dwc->dev, "%s FIFO Overrun\n", dep->name); break; case DWC3_DEPEVT_EPCMDCMPLT: - dwc3_ep_cmd_compl(dep, event); + dev_vdbg(dwc->dev, "Endpoint Command Complete\n"); break; } } -- 2.7.4