diff options
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
-rw-r--r-- | drivers/usb/dwc3/gadget.c | 99 |
1 files changed, 57 insertions, 42 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 2dea4fe69c6e..7f0236fb7196 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -177,6 +177,7 @@ static void dwc3_gadget_del_and_unmap_request(struct dwc3_ep *dep, list_del(&req->list); req->remaining = 0; req->needs_extra_trb = false; + req->num_trbs = 0; if (req->request.status == -EINPROGRESS) req->request.status = status; @@ -997,8 +998,8 @@ static void __dwc3_prepare_one_trb(struct dwc3_ep *dep, struct dwc3_trb *trb, trb->ctrl = DWC3_TRBCTL_ISOCHRONOUS; } - /* always enable Interrupt on Missed ISOC */ - trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI; + if (!no_interrupt && !chain) + trb->ctrl |= DWC3_TRB_CTRL_ISP_IMI; break; case USB_ENDPOINT_XFER_BULK: @@ -2070,14 +2071,42 @@ static void dwc3_gadget_disable_irq(struct dwc3 *dwc); static void __dwc3_gadget_stop(struct dwc3 *dwc); static int __dwc3_gadget_start(struct dwc3 *dwc); +static int dwc3_gadget_soft_disconnect(struct dwc3 *dwc) +{ + unsigned long flags; + + spin_lock_irqsave(&dwc->lock, flags); + dwc->connected = false; + + /* + * In the Synopsys DesignWare Cores USB3 Databook Rev. 3.30a + * Section 4.1.8 Table 4-7, it states that for a device-initiated + * disconnect, the SW needs to ensure that it sends "a DEPENDXFER + * command for any active transfers" before clearing the RunStop + * bit. + */ + dwc3_stop_active_transfers(dwc); + __dwc3_gadget_stop(dwc); + spin_unlock_irqrestore(&dwc->lock, flags); + + /* + * Note: if the GEVNTCOUNT indicates events in the event buffer, the + * driver needs to acknowledge them before the controller can halt. + * Simply let the interrupt handler acknowledges and handle the + * remaining event generated by the controller while polling for + * DSTS.DEVCTLHLT. + */ + return dwc3_gadget_run_stop(dwc, false, false); +} + static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) { struct dwc3 *dwc = gadget_to_dwc(g); - unsigned long flags; int ret; is_on = !!is_on; + dwc->softconnect = is_on; /* * Per databook, when we want to stop the gadget, if a control transfer * is still in process, complete it and get the core into setup phase. @@ -2110,53 +2139,32 @@ static int dwc3_gadget_pullup(struct usb_gadget *g, int is_on) ret = pm_runtime_get_sync(dwc->dev); if (!ret || ret < 0) { pm_runtime_put(dwc->dev); - return 0; + if (ret < 0) + pm_runtime_set_suspended(dwc->dev); + return ret; } - /* - * Synchronize and disable any further event handling while controller - * is being enabled/disabled. - */ - disable_irq(dwc->irq_gadget); - - spin_lock_irqsave(&dwc->lock, flags); + if (dwc->pullups_connected == is_on) { + pm_runtime_put(dwc->dev); + return 0; + } if (!is_on) { - u32 count; - - dwc->connected = false; + ret = dwc3_gadget_soft_disconnect(dwc); + } else { /* - * In the Synopsis DesignWare Cores USB3 Databook Rev. 3.30a - * Section 4.1.8 Table 4-7, it states that for a device-initiated - * disconnect, the SW needs to ensure that it sends "a DEPENDXFER - * command for any active transfers" before clearing the RunStop - * bit. + * 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. */ - dwc3_stop_active_transfers(dwc); - __dwc3_gadget_stop(dwc); + dwc3_core_soft_reset(dwc); - /* - * In the Synopsis DesignWare Cores USB3 Databook Rev. 3.30a - * Section 1.3.4, it mentions that for the DEVCTRLHLT bit, the - * "software needs to acknowledge the events that are generated - * (by writing to GEVNTCOUNTn) while it is waiting for this bit - * to be set to '1'." - */ - count = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0)); - count &= DWC3_GEVNTCOUNT_MASK; - if (count > 0) { - dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), count); - dwc->ev_buf->lpos = (dwc->ev_buf->lpos + count) % - dwc->ev_buf->length; - } - } else { + dwc3_event_buffers_setup(dwc); __dwc3_gadget_start(dwc); + ret = dwc3_gadget_run_stop(dwc, true, false); } - ret = dwc3_gadget_run_stop(dwc, is_on, false); - spin_unlock_irqrestore(&dwc->lock, flags); - enable_irq(dwc->irq_gadget); - pm_runtime_put(dwc->dev); return ret; @@ -3746,9 +3754,14 @@ static irqreturn_t dwc3_check_event_buf(struct dwc3_event_buffer *evt) u32 reg; if (pm_runtime_suspended(dwc->dev)) { + dwc->pending_events = true; + /* + * Trigger runtime resume. The get() function will be balanced + * after processing the pending events in dwc3_process_pending + * events(). + */ pm_runtime_get(dwc->dev); disable_irq_nosync(dwc->irq_gadget); - dwc->pending_events = true; return IRQ_HANDLED; } @@ -4007,7 +4020,7 @@ int dwc3_gadget_resume(struct dwc3 *dwc) int ret; u32 reg; - if (!dwc->gadget_driver) + if (!dwc->gadget_driver || !dwc->softconnect) return 0; ret = __dwc3_gadget_start(dwc); @@ -4040,6 +4053,8 @@ void dwc3_gadget_process_pending_events(struct dwc3 *dwc) { if (dwc->pending_events) { dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf); + dwc3_thread_interrupt(dwc->irq_gadget, dwc->ev_buf); + pm_runtime_put(dwc->dev); dwc->pending_events = false; enable_irq(dwc->irq_gadget); } |