Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 184d6fd3 authored by Shimrit Malichi's avatar Shimrit Malichi Committed by Mayank Rana
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 avatarMayank Rana <mrana@codeaurora.org>
parent b6cadaa8

drivers/usb/gadget/composite.c

+37 −30
Original line number Diff line number Diff line
@@ -711,7 +711,8 @@ 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++;
@@ -721,9 +722,10 @@ 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++;
@@ -740,14 +742,17 @@ 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;

	}



	/* The SuperSpeedPlus USB Device Capability descriptor */

	if (gadget_is_superspeed_plus(cdev->gadget)) {
@@ -1709,8 +1714,9 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) 
				} else {

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

				}

			} else {

				cdev->desc.bcdUSB = cpu_to_le16(0x0200);

			} 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);
@@ -1741,7 +1747,8 @@ 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);

			}