Commit 87dd9611 authored by Thinh Nguyen's avatar Thinh Nguyen Committed by Felipe Balbi
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usb: dwc3: gadget: Check ENBLSLPM before sending ep command 



When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or
GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an endpoint
command.

Current implementation only save and restore GUSB2PHYCFG.SUSPHY
configuration. We must save and clear both GUSB2PHYCFG.ENBLSLPM and
GUSB2PHYCFG.SUSPHY settings. Restore them after the command is
completed.

DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2

Signed-off-by: default avatarThinh Nguyen <thinhn@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent cd7cd0e6

drivers/usb/dwc3/gadget.c

+19 −10
Original line number Diff line number Diff line
@@ -270,27 +270,36 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd, 
	const struct usb_endpoint_descriptor *desc = dep->endpoint.desc;

	struct dwc3		*dwc = dep->dwc;

	u32			timeout = 1000;

	u32			saved_config = 0;

	u32			reg;



	int			cmd_status = 0;

	int			susphy = false;

	int			ret = -EINVAL;



	/*

	 * 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.

	 * When operating in USB 2.0 speeds (HS/FS), if GUSB2PHYCFG.ENBLSLPM or

	 * GUSB2PHYCFG.SUSPHY is set, it must be cleared before issuing an

	 * endpoint command.

	 *

	 * We will also set SUSPHY bit to what it was before returning as stated

	 * by the same section on Synopsys databook.

	 * Save and clear both GUSB2PHYCFG.ENBLSLPM and GUSB2PHYCFG.SUSPHY

	 * settings. Restore them after the command is completed.

	 *

	 * DWC_usb3 3.30a and DWC_usb31 1.90a programming guide section 3.2.2

	 */

	if (dwc->gadget.speed <= USB_SPEED_HIGH) {

		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));

		if (unlikely(reg & DWC3_GUSB2PHYCFG_SUSPHY)) {

			susphy = true;

			saved_config |= DWC3_GUSB2PHYCFG_SUSPHY;

			reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;

			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);

		}



		if (reg & DWC3_GUSB2PHYCFG_ENBLSLPM) {

			saved_config |= DWC3_GUSB2PHYCFG_ENBLSLPM;

			reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;

		}



		if (saved_config)

			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);

	}



	if (DWC3_DEPCMD_CMD(cmd) == DWC3_DEPCMD_STARTTRANSFER) {
@@ -389,9 +398,9 @@ int dwc3_send_gadget_ep_cmd(struct dwc3_ep *dep, unsigned cmd, 
		}

	}



	if (unlikely(susphy)) {

	if (saved_config) {

		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));

		reg |= DWC3_GUSB2PHYCFG_SUSPHY;

		reg |= saved_config;

		dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);

	}