Merge "dwc3-msm: reset hardware on bootup if cable not connected" (926ce420) · Commits · e / devices / android_kernel_fairphone_FP4

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

+2 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,8 @@ Optional properties :
		- vbus_dwc3-supply: phandle to the 5V VBUS supply regulator used for host mode.
		- USB3_GDSC-supply : phandle to the globally distributed switch controller
		regulator node to the USB controller.
		- dpdm-supply: phandle to dpdm supply which will be used to drive dp/dm lines
		in high-z state.
		- qcom,dwc-usb3-msm-tx-fifo-size: If present, represents RAM size available for
		TX fifo allocation in bytes
		- qcom,lpm-to-suspend-delay-ms: Indicates timeout (in milliseconds) to release wakeup source

drivers/usb/dwc3/dwc3-msm.c

+74 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,7 @@
		#include <linux/usb/gadget.h>
		#include <linux/usb/of.h>
		#include <linux/regulator/consumer.h>
		#include <linux/regulator/driver.h>
		#include <linux/pm_wakeup.h>
		#include <linux/power_supply.h>
		#include <linux/cdev.h>
		@@ -313,6 +314,10 @@ struct dwc3_msm {
		enum usb_device_speed override_usb_speed;
		u32 *gsi_reg;
		int gsi_reg_offset_cnt;

		struct notifier_block dpdm_nb;
		struct regulator *dpdm_reg;

		};

		#define USB_HSPHY_3P3_VOL_MIN 3050000 /* uV */
		@@ -2755,6 +2760,17 @@ static void dwc3_resume_work(struct work_struct *w)
		dwc->gadget.is_selfpowered = 0;
		}

		/*
		* Skip scheduling sm work if no work is pending. When boot-up
		* with USB cable connected, usb state m/c is skipped to avoid
		* any changes to dp/dm lines. As PM supsend and resume can
		* happen while charger is connected, scheduling sm work during
		* pm resume will reset the controller and phy which might impact
		* dp/dm lines (and charging voltage).
		*/
		if (mdwc->drd_state == DRD_STATE_UNDEFINED &&
		!edev && !mdwc->resume_pending)
		return;
		/*
		* exit LPM first to meet resume timeline from device side.
		* resume_pending flag would prevent calling
		@@ -3368,6 +3384,29 @@ static ssize_t bus_vote_store(struct device *dev,
		}
		static DEVICE_ATTR_RW(bus_vote);

		static int dwc_dpdm_cb(struct notifier_block nb, unsigned long evt, void p)
		{
		struct dwc3_msm *mdwc = container_of(nb, struct dwc3_msm, dpdm_nb);

		switch (evt) {
		case REGULATOR_EVENT_ENABLE:
		dev_dbg(mdwc->dev, "%s: enable state:%s\n", __func__,
		dwc3_drd_state_string(mdwc->drd_state));
		break;
		case REGULATOR_EVENT_DISABLE:
		dev_dbg(mdwc->dev, "%s: disable state:%s\n", __func__,
		dwc3_drd_state_string(mdwc->drd_state));
		if (mdwc->drd_state == DRD_STATE_UNDEFINED)
		schedule_delayed_work(&mdwc->sm_work, 0);
		break;
		default:
		dev_dbg(mdwc->dev, "%s: unknown event state:%s\n", __func__,
		dwc3_drd_state_string(mdwc->drd_state));
		break;
		}

		return NOTIFY_OK;
		}
		static int dwc3_msm_probe(struct platform_device *pdev)
		{
		struct device_node node = pdev->dev.of_node, dwc3_node;
		@@ -3675,6 +3714,29 @@ static int dwc3_msm_probe(struct platform_device *pdev)
		ret = dwc3_msm_extcon_register(mdwc);
		if (ret)
		goto put_dwc3;

		/*
		* dpdm regulator will be turned on to perform apsd
		* (automatic power source detection). dpdm regulator is
		* used to float (or high-z) dp/dm lines. Do not reset
		* controller/phy if regulator is turned on.
		* if dpdm is not present controller can be reset
		* as this controller may not be used for charger detection.
		*/
		mdwc->dpdm_reg = devm_regulator_get(&pdev->dev, "dpdm");
		if (IS_ERR(mdwc->dpdm_reg)) {
		dev_dbg(mdwc->dev, "assume cable is not connected\n");
		mdwc->dpdm_reg = NULL;
		}

		if (!mdwc->vbus_active && mdwc->dpdm_reg &&
		regulator_is_enabled(mdwc->dpdm_reg)) {
		mdwc->dpdm_nb.notifier_call = dwc_dpdm_cb;
		regulator_register_notifier(mdwc->dpdm_reg,
		&mdwc->dpdm_nb);
		} else {
		queue_delayed_work(mdwc->sm_usb_wq, &mdwc->sm_work, 0);
		}
		} else {
		if ((dwc3_is_otg_or_drd(dwc) &&
		!of_property_read_bool(node, "qcom,default-mode-host")) \|\|
		@@ -3721,6 +3783,12 @@ static int dwc3_msm_remove(struct platform_device *pdev)
		int ret_pm;

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

		if (mdwc->dpdm_nb.notifier_call) {
		regulator_unregister_notifier(mdwc->dpdm_reg, &mdwc->dpdm_nb);
		mdwc->dpdm_nb.notifier_call = NULL;
		}

		if (mdwc->usb_psy)
		power_supply_put(mdwc->usb_psy);

		@@ -4271,6 +4339,12 @@ static void dwc3_otg_sm_work(struct work_struct *w)
		/* Check OTG state */
		switch (mdwc->drd_state) {
		case DRD_STATE_UNDEFINED:
		if (mdwc->dpdm_nb.notifier_call) {
		regulator_unregister_notifier(mdwc->dpdm_reg,
		&mdwc->dpdm_nb);
		mdwc->dpdm_nb.notifier_call = NULL;
		}

		/* put controller and phy in suspend if no cable connected */
		if (test_bit(ID, &mdwc->inputs) &&
		!test_bit(B_SESS_VLD, &mdwc->inputs)) {