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Commit abe7752f authored by Shimrit Malichi's avatar Shimrit Malichi Committed by Tarun Gupta
Browse files

usb: gadget: Add link power management support 



Link Power Management (a.k.a. L1) is similar to the existing usb bus
suspend/resume/remote-wakeup, but has transitional latencies of tens
of microseconds between power states (instead of three to greater than
20 millisecond latencies of the USB 2.0 suspend/resume).

Change-Id: I8ae493534702e658c24f384a6b705b08e9ea9d05
Signed-off-by: default avatarShimrit Malichi <smalichi@codeaurora.org>
Signed-off-by: default avatarTarun Gupta <tarung@codeaurora.org>
parent f0331928

drivers/usb/chipidea/core.c

+2 −0
Original line number Diff line number Diff line
@@ -599,6 +599,8 @@ static int ci_hdrc_probe(struct platform_device *pdev) 
	ci->imx28_write_fix = !!(ci->platdata->flags &

		CI_HDRC_IMX28_WRITE_FIX);



	ci->gadget.l1_supported = ci->platdata->l1_supported;



	ret = hw_device_init(ci, base);

	if (ret < 0) {

		dev_err(dev, "can't initialize hardware\n");

drivers/usb/gadget/composite.c

+37 −28
Original line number Diff line number Diff line
@@ -643,7 +643,8 @@ static int bos_desc(struct usb_composite_dev *cdev) 


	/*

	 * A SuperSpeed device shall include the USB2.0 extension descriptor

	 * and shall support LPM when operating in USB2.0 HS mode.

	 * and shall support LPM when operating in USB2.0 HS mode, as well as

	 * a HS device when operating in USB2.1 HS mode.

	 */

	usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);

	bos->bNumDeviceCaps++;
@@ -653,9 +654,10 @@ static int bos_desc(struct usb_composite_dev *cdev) 
	usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;

	usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT);



	if (gadget_is_superspeed(cdev->gadget)) {

		/*

	 * The Superspeed USB Capability descriptor shall be implemented by all

	 * SuperSpeed devices.

		 * The Superspeed USB Capability descriptor shall be

		 * implemented by all SuperSpeed devices.

		 */

		ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);

		bos->bNumDeviceCaps++;
@@ -672,14 +674,17 @@ static int bos_desc(struct usb_composite_dev *cdev) 


		/* Get Controller configuration */

		if (cdev->gadget->ops->get_config_params)

		cdev->gadget->ops->get_config_params(&dcd_config_params);

			cdev->gadget->ops->get_config_params

				(&dcd_config_params);

		else {

		dcd_config_params.bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT;

			dcd_config_params.bU1devExitLat =

				USB_DEFAULT_U1_DEV_EXIT_LAT;

			dcd_config_params.bU2DevExitLat =

				cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT);

		}

		ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;

		ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;

	}



	return le16_to_cpu(bos->wTotalLength);

}
@@ -1619,6 +1624,9 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) 
				} else {

					cdev->desc.bcdUSB = cpu_to_le16(0x0210);

				}

			} else if (gadget->l1_supported) {

				cdev->desc.bcdUSB = cpu_to_le16(0x0210);

				DBG(cdev, "Config HS device with LPM(L1)\n");

			}



			value = min(w_length, (u16) sizeof cdev->desc);
@@ -1649,7 +1657,8 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) 
				value = min(w_length, (u16) value);

			break;

		case USB_DT_BOS:

			if (gadget_is_superspeed(gadget)) {

			if (gadget_is_superspeed(gadget) ||

				gadget->l1_supported) {

				value = bos_desc(cdev);

				value = min(w_length, (u16) value);

			}

include/linux/usb/chipidea.h

+1 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ struct ci_hdrc_platform_data { 
	void	(*notify_event) (struct ci_hdrc *ci, unsigned event);

	struct regulator	*reg_vbus;

	bool			tpl_support;

	bool			l1_supported;

};



/* Default offset of capability registers */

include/linux/usb/gadget.h

+1 −0
Original line number Diff line number Diff line
@@ -585,6 +585,7 @@ struct usb_gadget { 
	u32				xfer_isr_count;

	u8				usb_core_id;

	bool				streaming_enabled;

	bool				l1_supported;

};

#define work_to_gadget(w)	(container_of((w), struct usb_gadget, work))