Commit 9a5b2f31 authored by Huang Rui's avatar Huang Rui Committed by Felipe Balbi
Browse files

usb: dwc3: add u2exit lfps quirk 



This patch adds u2exit lfps quirk, and some special platforms can configure
that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: default avatarHuang Rui <ray.huang@amd.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 80caf7d2

Documentation/devicetree/bindings/usb/dwc3.txt

+1 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ Optional properties: 
	Only really useful for FPGA builds.

 - snps,has-lpm-erratum: true when DWC3 was configured with LPM Erratum enabled

 - snps,lpm-nyet-threshold: LPM NYET threshold

 - snps,u2exit_lfps_quirk: set if we want to enable u2exit lfps quirk



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
@@ -473,6 +473,9 @@ static int dwc3_core_init(struct dwc3 *dwc) 
	else

		reg &= ~DWC3_GCTL_DISSCRAMBLE;



	if (dwc->u2exit_lfps_quirk)

		reg |= DWC3_GCTL_U2EXIT_LFPS;



	/*

	 * WORKAROUND: DWC3 revisions <1.90a have a bug

	 * where the device can fail to connect at SuperSpeed
@@ -729,6 +732,8 @@ static int dwc3_probe(struct platform_device *pdev) 


		dwc->disable_scramble_quirk = of_property_read_bool(node,

				"snps,disable_scramble_quirk");

		dwc->u2exit_lfps_quirk = of_property_read_bool(node,

				"snps,u2exit_lfps_quirk");

	} else if (pdata) {

		dwc->maximum_speed = pdata->maximum_speed;

		dwc->has_lpm_erratum = pdata->has_lpm_erratum;
@@ -739,6 +744,7 @@ static int dwc3_probe(struct platform_device *pdev) 
		dwc->dr_mode = pdata->dr_mode;



		dwc->disable_scramble_quirk = pdata->disable_scramble_quirk;

		dwc->u2exit_lfps_quirk = pdata->u2exit_lfps_quirk;

	}



	/* default to superspeed if no maximum_speed passed */

drivers/usb/dwc3/core.h

+3 −0
Original line number Diff line number Diff line
@@ -166,6 +166,7 @@ 
#define DWC3_GCTL_SCALEDOWN(n)		((n) << 4)

#define DWC3_GCTL_SCALEDOWN_MASK	DWC3_GCTL_SCALEDOWN(3)

#define DWC3_GCTL_DISSCRAMBLE		(1 << 3)

#define DWC3_GCTL_U2EXIT_LFPS		(1 << 2)

#define DWC3_GCTL_GBLHIBERNATIONEN	(1 << 1)

#define DWC3_GCTL_DSBLCLKGTNG		(1 << 0)
@@ -679,6 +680,7 @@ struct dwc3_scratchpad_array { 
 * @start_config_issued: true when StartConfig command has been issued

 * @three_stage_setup: set if we perform a three phase setup

 * @disable_scramble_quirk: set if we enable the disable scramble quirk

 * @u2exit_lfps_quirk: set if we enable u2exit lfps quirk

 */

struct dwc3 {

	struct usb_ctrlrequest	*ctrl_req;
@@ -787,6 +789,7 @@ struct dwc3 { 
	unsigned		three_stage_setup:1;



	unsigned		disable_scramble_quirk:1;

	unsigned		u2exit_lfps_quirk:1;

};



/* -------------------------------------------------------------------------- */

drivers/usb/dwc3/platform_data.h

+1 −0
Original line number Diff line number Diff line
@@ -29,4 +29,5 @@ struct dwc3_platform_data { 


	unsigned disable_scramble_quirk:1;

	unsigned has_lpm_erratum:1;

	unsigned u2exit_lfps_quirk:1;

};

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