From: Felipe Balbi Date: Mon, 4 Apr 2016 06:19:17 +0000 (+0300) Subject: usb: dwc3: gadget: clear SUSPHY bit before ep cmds X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2b0f11df84bb66c9ac71395382c018f33c3ff9a4;p=linux-beck.git usb: dwc3: gadget: clear SUSPHY bit before ep cmds Synopsys Databook 2.60a has a note that if we're sending an endpoint command we _must_ make sure that DWC3_GUSB2PHY(n).SUSPHY bit is cleared. This patch implements that particular detail. Signed-off-by: Felipe Balbi --- diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index eb760b275004..79aad1061cdc 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -227,10 +227,27 @@ int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep, struct dwc3_ep *dep = dwc->eps[ep]; u32 timeout = 500; u32 reg; + + int susphy = false; int ret = -EINVAL; trace_dwc3_gadget_ep_cmd(dep, cmd, params); + /* + * Synopsys Databook 2.60a states, on section 6.3.2.5.[1-8], that if + * we're issuing an endpoint command, we must check if + * GUSB2PHYCFG.SUSPHY bit is set. If it is, then we need to clear it. + * + * We will also set SUSPHY bit to what it was before returning as stated + * by the same section on Synopsys databook. + */ + reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); + if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) { + susphy = true; + reg &= ~DWC3_GUSB2PHYCFG_SUSPHY; + dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); + } + dwc3_writel(dwc->regs, DWC3_DEPCMDPAR0(ep), params->param0); dwc3_writel(dwc->regs, DWC3_DEPCMDPAR1(ep), params->param1); dwc3_writel(dwc->regs, DWC3_DEPCMDPAR2(ep), params->param2); @@ -263,6 +280,12 @@ int dwc3_send_gadget_ep_cmd(struct dwc3 *dwc, unsigned ep, udelay(1); } while (1); + if (unlikely(susphy)) { + reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0)); + reg |= DWC3_GUSB2PHYCFG_SUSPHY; + dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg); + } + return ret; }