diff options
Diffstat (limited to 'drivers/usb/dwc3/gadget.c')
| -rw-r--r-- | drivers/usb/dwc3/gadget.c | 101 |
1 files changed, 75 insertions, 26 deletions
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index af023a81a0b0..3ac170f9d94d 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -385,24 +385,66 @@ static void dwc3_free_trb_pool(struct dwc3_ep *dep) dep->trb_pool_dma = 0; } +static int dwc3_gadget_set_xfer_resource(struct dwc3 *dwc, struct dwc3_ep *dep); + +/** + * dwc3_gadget_start_config - Configure EP resources + * @dwc: pointer to our controller context structure + * @dep: endpoint that is being enabled + * + * The assignment of transfer resources cannot perfectly follow the + * data book due to the fact that the controller driver does not have + * all knowledge of the configuration in advance. It is given this + * information piecemeal by the composite gadget framework after every + * SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook + * programming model in this scenario can cause errors. For two + * reasons: + * + * 1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION + * and SET_INTERFACE (8.1.5). This is incorrect in the scenario of + * multiple interfaces. + * + * 2) The databook does not mention doing more DEPXFERCFG for new + * endpoint on alt setting (8.1.6). + * + * The following simplified method is used instead: + * + * All hardware endpoints can be assigned a transfer resource and this + * setting will stay persistent until either a core reset or + * hibernation. So whenever we do a DEPSTARTCFG(0) we can go ahead and + * do DEPXFERCFG for every hardware endpoint as well. We are + * guaranteed that there are as many transfer resources as endpoints. + * + * This function is called for each endpoint when it is being enabled + * but is triggered only when called for EP0-out, which always happens + * first, and which should only happen in one of the above conditions. + */ static int dwc3_gadget_start_config(struct dwc3 *dwc, struct dwc3_ep *dep) { struct dwc3_gadget_ep_cmd_params params; u32 cmd; + int i; + int ret; + + if (dep->number) + return 0; memset(¶ms, 0x00, sizeof(params)); + cmd = DWC3_DEPCMD_DEPSTARTCFG; - if (dep->number != 1) { - cmd = DWC3_DEPCMD_DEPSTARTCFG; - /* XferRscIdx == 0 for ep0 and 2 for the remaining */ - if (dep->number > 1) { - if (dwc->start_config_issued) - return 0; - dwc->start_config_issued = true; - cmd |= DWC3_DEPCMD_PARAM(2); - } + ret = dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms); + if (ret) + return ret; + + for (i = 0; i < DWC3_ENDPOINTS_NUM; i++) { + struct dwc3_ep *dep = dwc->eps[i]; - return dwc3_send_gadget_ep_cmd(dwc, 0, cmd, ¶ms); + if (!dep) + continue; + + ret = dwc3_gadget_set_xfer_resource(dwc, dep); + if (ret) + return ret; } return 0; @@ -421,7 +463,7 @@ static int dwc3_gadget_set_ep_config(struct dwc3 *dwc, struct dwc3_ep *dep, | DWC3_DEPCFG_MAX_PACKET_SIZE(usb_endpoint_maxp(desc)); /* Burst size is only needed in SuperSpeed mode */ - if (dwc->gadget.speed == USB_SPEED_SUPER) { + if (dwc->gadget.speed >= USB_SPEED_SUPER) { u32 burst = dep->endpoint.maxburst - 1; params.param0 |= DWC3_DEPCFG_BURST_SIZE(burst); @@ -516,10 +558,6 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep, struct dwc3_trb *trb_st_hw; struct dwc3_trb *trb_link; - ret = dwc3_gadget_set_xfer_resource(dwc, dep); - if (ret) - return ret; - dep->endpoint.desc = desc; dep->comp_desc = comp_desc; dep->type = usb_endpoint_type(desc); @@ -1403,7 +1441,8 @@ static int dwc3_gadget_wakeup(struct usb_gadget *g) reg = dwc3_readl(dwc->regs, DWC3_DSTS); speed = reg & DWC3_DSTS_CONNECTSPD; - if (speed == DWC3_DSTS_SUPERSPEED) { + if ((speed == DWC3_DSTS_SUPERSPEED) || + (speed == DWC3_DSTS_SUPERSPEED_PLUS)) { dwc3_trace(trace_dwc3_gadget, "no wakeup on SuperSpeed\n"); ret = -EINVAL; goto out; @@ -1628,16 +1667,20 @@ static int dwc3_gadget_start(struct usb_gadget *g, case USB_SPEED_HIGH: reg |= DWC3_DSTS_HIGHSPEED; break; - case USB_SPEED_SUPER: /* FALLTHROUGH */ - case USB_SPEED_UNKNOWN: /* FALTHROUGH */ + case USB_SPEED_SUPER_PLUS: + reg |= DWC3_DSTS_SUPERSPEED_PLUS; + break; default: - reg |= DWC3_DSTS_SUPERSPEED; + dev_err(dwc->dev, "invalid dwc->maximum_speed (%d)\n", + dwc->maximum_speed); + /* fall through */ + case USB_SPEED_SUPER: + reg |= DWC3_DCFG_SUPERSPEED; + break; } } dwc3_writel(dwc->regs, DWC3_DCFG, reg); - dwc->start_config_issued = false; - /* Start with SuperSpeed Default */ dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); @@ -2237,7 +2280,6 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc) dwc3_writel(dwc->regs, DWC3_DCTL, reg); dwc3_disconnect_gadget(dwc); - dwc->start_config_issued = false; dwc->gadget.speed = USB_SPEED_UNKNOWN; dwc->setup_packet_pending = false; @@ -2288,7 +2330,6 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc) dwc3_stop_active_transfers(dwc); dwc3_clear_stall_all_ep(dwc); - dwc->start_config_issued = false; /* Reset device address to zero */ reg = dwc3_readl(dwc->regs, DWC3_DCFG); @@ -2306,7 +2347,8 @@ static void dwc3_update_ram_clk_sel(struct dwc3 *dwc, u32 speed) * this. Maybe it becomes part of the power saving plan. */ - if (speed != DWC3_DSTS_SUPERSPEED) + if ((speed != DWC3_DSTS_SUPERSPEED) && + (speed != DWC3_DSTS_SUPERSPEED_PLUS)) return; /* @@ -2335,6 +2377,11 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) dwc3_update_ram_clk_sel(dwc, speed); switch (speed) { + case DWC3_DCFG_SUPERSPEED_PLUS: + dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512); + dwc->gadget.ep0->maxpacket = 512; + dwc->gadget.speed = USB_SPEED_SUPER_PLUS; + break; case DWC3_DCFG_SUPERSPEED: /* * WORKAROUND: DWC3 revisions <1.90a have an issue which @@ -2376,8 +2423,9 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) /* Enable USB2 LPM Capability */ - if ((dwc->revision > DWC3_REVISION_194A) - && (speed != DWC3_DCFG_SUPERSPEED)) { + if ((dwc->revision > DWC3_REVISION_194A) && + (speed != DWC3_DCFG_SUPERSPEED) && + (speed != DWC3_DCFG_SUPERSPEED_PLUS)) { reg = dwc3_readl(dwc->regs, DWC3_DCFG); reg |= DWC3_DCFG_LPM_CAP; dwc3_writel(dwc->regs, DWC3_DCFG, reg); @@ -2789,6 +2837,7 @@ int dwc3_gadget_init(struct dwc3 *dwc) dwc->gadget.speed = USB_SPEED_UNKNOWN; dwc->gadget.sg_supported = true; dwc->gadget.name = "dwc3-gadget"; + dwc->gadget.is_otg = dwc->dr_mode == USB_DR_MODE_OTG; /* * FIXME We might be setting max_speed to <SUPER, however versions |