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Commit 8220a980 authored by Hemant Kumar's avatar Hemant Kumar Committed by Mayank Rana
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usb: dwc3: Reset and initiate lpm while booting up with no usb cable 



Reset and initiate controller and phy low power mode to bring them to
known good state during boot up. This will avoid any leakage and makes
sure that DP/DM lines are in high-z state.

Change-Id: I55dbe8d42ce9e56046bd7c99e17c2ec6f368c9a6
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
parent 1965ae98

drivers/usb/dwc3/dwc3-msm.c

+32 −7
Original line number Diff line number Diff line
@@ -2839,6 +2839,7 @@ static int dwc3_msm_probe(struct platform_device *pdev) 
{

	struct device_node *node = pdev->dev.of_node, *dwc3_node;

	struct device	*dev = &pdev->dev;

	union power_supply_propval pval = {0};

	struct dwc3_msm *mdwc;

	struct dwc3	*dwc;

	struct resource *res;
@@ -3135,10 +3136,8 @@ static int dwc3_msm_probe(struct platform_device *pdev) 
	 */

	mdwc->lpm_flags = MDWC3_POWER_COLLAPSE | MDWC3_SS_PHY_SUSPEND;

	atomic_set(&dwc->in_lpm, 1);

	pm_runtime_set_suspended(mdwc->dev);

	pm_runtime_set_autosuspend_delay(mdwc->dev, 1000);

	pm_runtime_use_autosuspend(mdwc->dev);

	pm_runtime_enable(mdwc->dev);

	device_init_wakeup(mdwc->dev, 1);



	if (of_property_read_bool(node, "qcom,disable-dev-mode-pm"))
@@ -3155,19 +3154,33 @@ static int dwc3_msm_probe(struct platform_device *pdev) 
		mdwc->pm_qos_latency = 0;

	}



	mdwc->usb_psy = power_supply_get_by_name("usb");

	if (!mdwc->usb_psy) {

		dev_warn(mdwc->dev, "Could not get usb power_supply\n");

		pval.intval = -EINVAL;

	} else {

		power_supply_get_property(mdwc->usb_psy,

			POWER_SUPPLY_PROP_PRESENT, &pval);

	}



	/* Update initial VBUS/ID state from extcon */

	if (mdwc->extcon_vbus && extcon_get_cable_state_(mdwc->extcon_vbus,

							EXTCON_USB))

		dwc3_msm_vbus_notifier(&mdwc->vbus_nb, true, mdwc->extcon_vbus);

	if (mdwc->extcon_id && extcon_get_cable_state_(mdwc->extcon_id,

	else if (mdwc->extcon_id && extcon_get_cable_state_(mdwc->extcon_id,

							EXTCON_USB_HOST))

		dwc3_msm_id_notifier(&mdwc->id_nb, true, mdwc->extcon_id);

	else if (!pval.intval) {

		/* USB cable is not connected */

		schedule_delayed_work(&mdwc->sm_work, 0);

	} else {

		if (pval.intval > 0)

			dev_info(mdwc->dev, "charger detection in progress\n");

	}



	device_create_file(&pdev->dev, &dev_attr_mode);

	device_create_file(&pdev->dev, &dev_attr_speed);



	schedule_delayed_work(&mdwc->sm_work, 0);



	host_mode = usb_get_dr_mode(&mdwc->dwc3->dev) == USB_DR_MODE_HOST;

	if (!dwc->is_drd && host_mode) {

		dev_dbg(&pdev->dev, "DWC3 in host only mode\n");
@@ -3680,13 +3693,25 @@ static void dwc3_otg_sm_work(struct work_struct *w) 
	/* Check OTG state */

	switch (mdwc->otg_state) {

	case OTG_STATE_UNDEFINED:

		/* Do nothing if no cable connected */

		/* put controller and phy in suspend if no cable connected */

		if (test_bit(ID, &mdwc->inputs) &&

				!test_bit(B_SESS_VLD, &mdwc->inputs))

				!test_bit(B_SESS_VLD, &mdwc->inputs)) {

			dbg_event(0xFF, "undef_id_!bsv", 0);

			pm_runtime_set_active(mdwc->dev);

			pm_runtime_enable(mdwc->dev);

			pm_runtime_get_noresume(mdwc->dev);

			dwc3_msm_resume(mdwc);

			pm_runtime_put_sync(mdwc->dev);

			dbg_event(0xFF, "Undef NoUSB",

				atomic_read(&mdwc->dev->power.usage_count));

			mdwc->otg_state = OTG_STATE_B_IDLE;

			break;

		}



		dbg_event(0xFF, "Exit UNDEF", 0);

		mdwc->otg_state = OTG_STATE_B_IDLE;

		pm_runtime_set_suspended(mdwc->dev);

		pm_runtime_enable(mdwc->dev);

		/* fall-through */

	case OTG_STATE_B_IDLE:

		if (!test_bit(ID, &mdwc->inputs)) {