Commit b77f2ffe authored by Nagarjuna Kristam's avatar Nagarjuna Kristam Committed by Thierry Reding
Browse files

usb: gadget: tegra-xudc: Add usb-phy support 



usb-phy is used to get notified on the USB role changes. Get usb-phy from
the UTMI PHY.

Signed-off-by: default avatarNagarjuna Kristam <nkristam@nvidia.com>
Acked-by: default avatarFelipe Balbi <balbi@kernel.org>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 9ce0a14b

drivers/usb/gadget/udc/tegra-xudc.c

+45 −3
Original line number Diff line number Diff line
@@ -26,7 +26,9 @@ 
#include <linux/reset.h>

#include <linux/usb/ch9.h>

#include <linux/usb/gadget.h>

#include <linux/usb/otg.h>

#include <linux/usb/role.h>

#include <linux/usb/phy.h>

#include <linux/workqueue.h>



/* XUSB_DEV registers */
@@ -487,6 +489,9 @@ struct tegra_xudc { 
	bool suspended;

	bool powergated;



	struct usb_phy *usbphy;

	struct notifier_block vbus_nb;



	struct completion disconnect_complete;



	bool selfpowered;
@@ -669,6 +674,31 @@ static void tegra_xudc_usb_role_sw_work(struct work_struct *work) 
		tegra_xudc_device_mode_off(xudc);

}



static int tegra_xudc_vbus_notify(struct notifier_block *nb,

					 unsigned long action, void *data)

{

	struct tegra_xudc *xudc = container_of(nb, struct tegra_xudc,

					       vbus_nb);

	struct usb_phy *usbphy = (struct usb_phy *)data;



	dev_dbg(xudc->dev, "%s(): event is %d\n", __func__, usbphy->last_event);



	if ((xudc->device_mode && usbphy->last_event == USB_EVENT_VBUS) ||

	    (!xudc->device_mode && usbphy->last_event != USB_EVENT_VBUS)) {

		dev_dbg(xudc->dev, "Same role(%d) received. Ignore",

			xudc->device_mode);

		return NOTIFY_OK;

	}



	xudc->device_mode = (usbphy->last_event == USB_EVENT_VBUS) ? true :

								     false;



	if (!xudc->suspended)

		schedule_work(&xudc->usb_role_sw_work);



	return NOTIFY_OK;

}



static void tegra_xudc_plc_reset_work(struct work_struct *work)

{

	struct delayed_work *dwork = to_delayed_work(work);
@@ -1937,6 +1967,9 @@ static int tegra_xudc_gadget_start(struct usb_gadget *gadget, 
		xudc_writel(xudc, val, CTRL);

	}



	if (xudc->usbphy)

		otg_set_peripheral(xudc->usbphy->otg, gadget);



	xudc->driver = driver;

unlock:

	dev_dbg(xudc->dev, "%s: ret value is %d", __func__, ret);
@@ -1957,6 +1990,9 @@ static int tegra_xudc_gadget_stop(struct usb_gadget *gadget) 


	spin_lock_irqsave(&xudc->lock, flags);



	if (xudc->usbphy)

		otg_set_peripheral(xudc->usbphy->otg, NULL);



	val = xudc_readl(xudc, CTRL);

	val &= ~(CTRL_IE | CTRL_ENABLE);

	xudc_writel(xudc, val, CTRL);
@@ -3558,9 +3594,15 @@ static int tegra_xudc_probe(struct platform_device *pdev) 
	INIT_DELAYED_WORK(&xudc->port_reset_war_work,

				tegra_xudc_port_reset_war_work);



	/* Set the mode as device mode and this keeps phy always ON */

	xudc->device_mode = true;

	schedule_work(&xudc->usb_role_sw_work);

	xudc->vbus_nb.notifier_call = tegra_xudc_vbus_notify;

	xudc->usbphy = devm_usb_get_phy_by_node(xudc->dev,

						xudc->utmi_phy->dev.of_node,

						&xudc->vbus_nb);

	if (IS_ERR(xudc->usbphy)) {

		err = PTR_ERR(xudc->usbphy);

		dev_err(xudc->dev, "failed to get USB PHY: %d\n", err);

		goto free_eps;

	}



	pm_runtime_enable(&pdev->dev);