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Commit 9cd474b2 authored by Ajay Agarwal's avatar Ajay Agarwal
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usb: dwc3-msm: Add support for snps SSPHY suspend in system suspend 



Currently the platforms using SNPS SSPHY do not suspend it so as
to receive SS wakeup events via pwr_event_irq. But certain
telematics platforms do not need SS wakeup in system suspend
scenario. Add devicetree flag 'qcom,no-wakeup-from-pm-suspend'
support and based on this flag, allow SSPHY suspend to happen as
a part of system suspend, even if SS/no device is connected.

Change-Id: I691585e15539490e63a345fe2b3aacf182352399
Signed-off-by: default avatarAjay Agarwal <ajaya@codeaurora.org>
parent caa465c2

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

+3 −0
Original line number Diff line number Diff line
@@ -93,6 +93,9 @@ Optional properties : 
	capable DWC3 which does not have extcon handle.

- qcom,default-mode-host: If present, start host mode on probe for an OTG

	capable DWC3 which does not have extcon handle.

- qcom,no-wakeup-from-pm-suspend: If present, there is no need of SS wakeup events via

	pwr_event_irq in system suspend scenario. So in system suspend and hibernation,

	we can suspend the SSPHY.



Sub nodes:

- Sub node for "DWC3- USB3 controller".

drivers/usb/dwc3/dwc3-msm.c

+14 −6
Original line number Diff line number Diff line
@@ -333,6 +333,9 @@ struct dwc3_msm { 


	struct device_node *dwc3_node;

	struct property *num_gsi_eps;



	/* Enable remote wakeup during system suspend */

	bool			enable_wakeup;

};



#define USB_HSPHY_3P3_VOL_MIN		3050000 /* uV */
@@ -2470,7 +2473,8 @@ static int dwc3_msm_update_bus_bw(struct dwc3_msm *mdwc, enum bus_vote bv) 
	return ret;

}



static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse)

static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse,

					bool enable_wakeup)

{

	int ret;

	struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);
@@ -2566,7 +2570,8 @@ static int dwc3_msm_suspend(struct dwc3_msm *mdwc, bool force_power_collapse) 
		((mdwc->hs_phy->flags & (PHY_HSFS_MODE | PHY_LS_MODE)) &&

			!dwc3_msm_is_superspeed(mdwc)));

	can_suspend_ssphy = dwc->maximum_speed >= USB_SPEED_SUPER &&

			(!mdwc->use_pwr_event_for_wakeup || no_active_ss);

			(!mdwc->use_pwr_event_for_wakeup || no_active_ss ||

			 !enable_wakeup);

	/* Suspend SS PHY */

	if (can_suspend_ssphy) {

		if (mdwc->in_host_mode) {
@@ -3931,10 +3936,13 @@ static int dwc3_msm_probe(struct platform_device *pdev) 
	/*

	 * On platforms with SS PHY that do not support ss_phy_irq for wakeup

	 * events, use pwr_event_irq for wakeup events in superspeed mode.

	 * But some of these platforms do not need SS wakeup events in system

	 * suspend scenario. Accommodate that case as well.

	 */

	mdwc->use_pwr_event_for_wakeup = dwc->maximum_speed >= USB_SPEED_SUPER

					&& !mdwc->wakeup_irq[SS_PHY_IRQ].irq;



	mdwc->enable_wakeup = !of_property_read_bool(node,

				"qcom,no-wakeup-from-pm-suspend");



	/* IOMMU will be reattached upon each resume/connect */

	if (mdwc->iommu_map)
@@ -4850,7 +4858,7 @@ static int dwc3_msm_pm_suspend(struct device *dev) 
		return 0;

	}



	ret = dwc3_msm_suspend(mdwc, false);

	ret = dwc3_msm_suspend(mdwc, false, mdwc->enable_wakeup);

	if (!ret)

		atomic_set(&mdwc->pm_suspended, 1);
@@ -4927,7 +4935,7 @@ static int dwc3_msm_pm_freeze(struct device *dev) 
	 * Power collapse the core. Hence call dwc3_msm_suspend with

	 * 'force_power_collapse' set to 'true'.

	 */

	ret = dwc3_msm_suspend(mdwc, true);

	ret = dwc3_msm_suspend(mdwc, true, mdwc->enable_wakeup);

	if (!ret)

		atomic_set(&mdwc->pm_suspended, 1);
@@ -4995,7 +5003,7 @@ static int dwc3_msm_runtime_suspend(struct device *dev) 
	dev_dbg(dev, "DWC3-msm runtime suspend\n");

	dbg_event(0xFF, "RT Sus", 0);



	return dwc3_msm_suspend(mdwc, false);

	return dwc3_msm_suspend(mdwc, false, false);

}



static int dwc3_msm_runtime_resume(struct device *dev)