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Commit 628fd947 authored by Azhar Shaikh's avatar Azhar Shaikh
Browse files

usb: gadget: Disable L1 LPM capability 



Disable USB L1 LPM functionality on MSM platforms by setting the
USB version as 0x200 for all High Speed Devices.
Add a module param, which when enabled will set the USB version as
0x210. Module param can be enabled as

echo Y > /sys/module/libcomposite/parameters/enable_l1_for_hs

Change-Id: I781a237b44e542c6089af36b7ce0a0665d3cd440
Signed-off-by: default avatarAzhar Shaikh <azhars@codeaurora.org>
parent 55bc7ff0

drivers/usb/dwc3/gadget.c

+2 −0
Original line number Diff line number Diff line
@@ -2902,6 +2902,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) 
	reg = dwc3_readl(dwc->regs, DWC3_DSTS);

	speed = reg & DWC3_DSTS_CONNECTSPD;

	dwc->speed = speed;

	dwc->gadget.l1_supported = true;



	dwc3_update_ram_clk_sel(dwc, speed);
@@ -2930,6 +2931,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) 
	case DWC3_DCFG_HIGHSPEED:

		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);

		dwc->gadget.ep0->maxpacket = 64;

		dwc->gadget.l1_supported = false;

		dwc->gadget.speed = USB_SPEED_HIGH;

		break;

	case DWC3_DCFG_FULLSPEED2:

drivers/usb/gadget/composite.c

+11 −3
Original line number Diff line number Diff line
@@ -23,6 +23,10 @@ 


#include "u_os_desc.h"



static bool enable_l1_for_hs;

module_param(enable_l1_for_hs, bool, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(enable_l1_for_hs, "Enable support for L1 LPM for HS devices");



/**

 * struct usb_os_string - represents OS String to be reported by a gadget

 * @bLength: total length of the entire descritor, always 0x12
@@ -1621,8 +1625,11 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) 
				if (gadget->speed >= USB_SPEED_SUPER) {

					cdev->desc.bcdUSB = cpu_to_le16(0x0300);

					cdev->desc.bMaxPacketSize0 = 9;

				} else {

				} else if (gadget->l1_supported ||

						enable_l1_for_hs) {

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

					DBG(cdev,

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

				}

			} else if (gadget->l1_supported) {

				cdev->desc.bcdUSB = cpu_to_le16(0x0210);
@@ -1657,8 +1664,9 @@ 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) ||

				gadget->l1_supported) {

			if ((gadget_is_superspeed(gadget) &&

				(gadget->speed >= USB_SPEED_SUPER))

				 || gadget->l1_supported) {

				value = bos_desc(cdev);

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

			}