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Commit dcc2087a authored by Dov Levenglick's avatar Dov Levenglick
Browse files

usb: dwc3: add support to skip power collapse 



Adds support for skipping the power collapse flow
(dwc3_msm_config_gdsc) when peforming the suspend/disconnect
flows.
This is necessary until the device-specific flow for supporting
power collapse is implemented on each new device. As such,
usage this flag is expected to be done only in the earlier
stages of a product's life cycle.

Change-Id: Idd133664242665fecc5491d42d65e7adbe0ccaa3
Signed-off-by: default avatarDov Levenglick <dovl@codeaurora.org>
parent 072185c6

Documentation/devicetree/bindings/usb/msm-ssusb.txt

+1 −0
Original line number Original line Diff line number Diff line
@@ -51,6 +51,7 @@ Optional properties : 
- qcom,usb-dbm : phandle for the DBM device

- qcom,usb-dbm : phandle for the DBM device

- qcom,usbin-vadc: Corresponding vadc device's phandle to read usbin voltage using VADC.

- qcom,usbin-vadc: Corresponding vadc device's phandle to read usbin voltage using VADC.

	This will be used to get value of usb power supply's VOLTAGE_NOW property,

	This will be used to get value of usb power supply's VOLTAGE_NOW property,

- qcom,no-power-collapse: If present, the USB core will not perform power collapse





Sub nodes:

Sub nodes:

- Sub node for "DWC3- USB3 controller".

- Sub node for "DWC3- USB3 controller".

drivers/usb/dwc3/dwc3-msm.c

+6 −2
Original line number Original line Diff line number Diff line
@@ -192,6 +192,7 @@ struct dwc3_msm { 
	struct completion ext_chg_wait;

	struct completion ext_chg_wait;

	unsigned int scm_dev_id;

	unsigned int scm_dev_id;

	bool suspend_resume_no_support;

	bool suspend_resume_no_support;

	bool disable_power_collapse;

};

};





#define USB_HSPHY_3P3_VOL_MIN		3050000 /* uV */

#define USB_HSPHY_3P3_VOL_MIN		3050000 /* uV */
@@ -1450,7 +1451,7 @@ static int dwc3_msm_suspend(struct dwc3_msm *mdwc) 
	wmb();

	wmb();





	/* remove vote for controller power collapse */

	/* remove vote for controller power collapse */

	if (!host_bus_suspend)

	if (!host_bus_suspend && !mdwc->disable_power_collapse)

		dwc3_msm_config_gdsc(mdwc, 0);

		dwc3_msm_config_gdsc(mdwc, 0);





	clk_disable_unprepare(mdwc->iface_clk);

	clk_disable_unprepare(mdwc->iface_clk);
@@ -1533,7 +1534,7 @@ static int dwc3_msm_resume(struct dwc3_msm *mdwc) 
	}

	}





	/* add vote for controller power collapse */

	/* add vote for controller power collapse */

	if (!host_bus_suspend)

	if (!host_bus_suspend && !mdwc->disable_power_collapse)

		dwc3_msm_config_gdsc(mdwc, 1);

		dwc3_msm_config_gdsc(mdwc, 1);





	clk_prepare_enable(mdwc->utmi_clk);

	clk_prepare_enable(mdwc->utmi_clk);
@@ -2427,6 +2428,9 @@ static int dwc3_msm_probe(struct platform_device *pdev) 




	mdwc->suspend_resume_no_support = of_property_read_bool(node,

	mdwc->suspend_resume_no_support = of_property_read_bool(node,

				"qcom,no-suspend-resume");

				"qcom,no-suspend-resume");



	mdwc->disable_power_collapse = of_property_read_bool(node,

				"qcom,no-power-collapse");

	/*

	/*

	 * DWC3 has separate IRQ line for OTG events (ID/BSV) and for

	 * DWC3 has separate IRQ line for OTG events (ID/BSV) and for

	 * DP and DM linestate transitions during low power mode.

	 * DP and DM linestate transitions during low power mode.