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Commit ed0776a7 authored by Mayank Rana's avatar Mayank Rana
Browse files

usb: dwc3: Add support for setting LPM_NYET_THRESH 



Add support to set the LPM_NYET_THRESH parameter.
If BESL value received from the host in the LPM token is
less than this value we send LPM ACK to the host.
Otherwise the device returns LPM NYET

Change-Id: I360c89c5a7d927ad1fc16a4994cdbdf8a5120d5a
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
parent 1677ceb2

Documentation/devicetree/bindings/usb/dwc3.txt

+3 −0
Original line number Diff line number Diff line
@@ -25,6 +25,9 @@ Optional properties: 
	controls the UTMI sleep mechanism vs. the PHY. Default value is 12.

 - snps,bus-suspend-enable: If present then controller supports low power mode

	during bus suspend.

 - snps,lpm-nyet-thresh: If present, will determine the value of DCTL[LPM_NYET_Thres].

        If BESL value received from the host in the LPM token is less than this value we send LPM ACK to the host.

        Otherwise the device returns LPM NYET.



This is usually a subnode to DWC3 glue to which it is connected.

drivers/usb/dwc3/core.c

+6 −0
Original line number Diff line number Diff line
@@ -570,6 +570,7 @@ static int dwc3_probe(struct platform_device *pdev) 
	void			*mem;



	u32			hird_thresh;

	u32			lpm_nyet_thresh;

	u8			mode;

	bool			host_only_mode;
@@ -635,6 +636,11 @@ static int dwc3_probe(struct platform_device *pdev) 
	else

		dwc->hird_thresh = DWC3_DCTL_HIRD_THRES_DEFAULT;



	ret = of_property_read_u32(node, "snps,lpm-nyet-thresh",

						&lpm_nyet_thresh);

	if (!ret)

		dwc->lpm_nyet_thresh = (u8)lpm_nyet_thresh;



	dwc->enable_bus_suspend = of_property_read_bool(node,

						"snps,bus-suspend-enable");

drivers/usb/dwc3/core.h

+5 −0
Original line number Diff line number Diff line
@@ -262,6 +262,9 @@ 


#define DWC3_DCTL_APPL1RES	(1 << 23)



#define DWC3_DCTL_LPM_NYET_THRES_MASK	(0x0f << 20)

#define DWC3_DCTL_LPM_NYET_THRES(n)	((n) << 20)



/* These apply for core versions 1.87a and earlier */

#define DWC3_DCTL_TRGTULST_MASK		(0x0f << 17)

#define DWC3_DCTL_TRGTULST(n)		((n) << 17)
@@ -784,6 +787,7 @@ struct dwc3_scratchpad_array { 
 *	during disconnect and set it after device is configured.

 * @usb3_u1u2_disable: if true, disable U1U2 low power modes in Superspeed mode.

 * @hird_thresh: value to configure in DCTL[HIRD_Thresh]

 * @lpm_nyet_thresh: value to configure in DCTL[LPM_NYET_Thresh]

 * @in_lpm: if 1, indicates that the controller is in low power mode (no clocks)

 * @irq: irq number

 * @bh: tasklet which handles the interrupt
@@ -902,6 +906,7 @@ struct dwc3 { 
	bool			usb3_u1u2_disable;

	bool			enable_bus_suspend;

	u8			hird_thresh;

	u8			lpm_nyet_thresh;

	atomic_t		in_lpm;

	struct dwc3_gadget_events	dbg_gadget_events;

drivers/usb/dwc3/gadget.c

+10 −0
Original line number Diff line number Diff line
@@ -3039,6 +3039,16 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) 
		reg = dwc3_readl(dwc->regs, DWC3_DCTL);

		reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);

		reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_thresh);



		/*

		 * If USB2.0 LPM ECN Errata is enabled in DWC Core then set

		 * LPM_NYET_THRESH.

		 */

		if (dwc->revision >= DWC3_REVISION_240A &&

					dwc->lpm_nyet_thresh) {

			reg &= ~DWC3_DCTL_LPM_NYET_THRES_MASK;

			reg |= DWC3_DCTL_LPM_NYET_THRES(dwc->lpm_nyet_thresh);

		}

		dwc3_writel(dwc->regs, DWC3_DCTL, reg);

	}