Zynq Ultrascale MPSOC Linux USB device driver


Introduction

USB 3.0 is the second major revision of the Universal Serial Bus (USB) standard for computer connectivity. USB 3.0 implements a 5.0 Gbit/s raw transfer rate using 8b/10b encoding. USB 2.0 implements the Hi-Speed mode (HS – 480 Mbit/s), while USB 1.1 implements Low Speed (LS) – 1.5 Mbit/s and Full Speed (FS) – 12 Mbit/s). The USB 3.0 Controller used shall provide one 5.0Gbit/s USB channel using the PS internal GT as PHY.

Table of Contents

HW/IP Features

The ZynqMP USB 3.0 Controller shall provide one 5.0Gbit/s USB channel using the PS internal GT as PHY.
  • Two USB 2.0/3.0 controllers
  • Compliant with USB 3.0 specs
  • Compliant with xHCI standard
  • Supports 5.0 Gbps data rate
  • Support host, device and OTG modes
  • Support On The Go (OTG) 2.0 host/device selection
  • Provide simultaneous operation of the USB2.0 and USB3.0 interfaces where applicable
    • In host mode, as required by the standard for speed negotiation and switching
    • In device mode, statically configured as USB2.0 or USB3.0
    • In OTG mode, dynamically switch between host role and device role
      • HNP, SRP supported at USB 2.0 speeds in OTG
      • DRD supported in USB 3.0 speeds
  • 64-bit AXI master port with built-in DMA
  • Register programming via AXI and/or APB slave ports
  • Power management features: hibernation mode
  • Support 44-bit address space
  • Supports Link Power Management (LPM) transfers to save power when bus is idle

Features supported in driver

  • All the HW/IP features are supported by driver

Missing Features, Known Issues and Limitations

  • ZynqMP USB 3.0 controller doesn't support USB 3.0 OTG (On The Go) host/device selection


  • USB core reset in Linux can cause issues with USB device connected if it was previously powered in U-boot - AR-72376

  • USB3.0 device mode does not work when booting through USB boot mode - AR-72409
  • USB 3.0 standalone device driver does not send STALL response for every unsupported command - AR-71925

  • USB 3.0 port hangs after plug-in and plug-out cable in gadget mode - AR-76696
  • USB DWC3-core getting the clock error message "Failed to get clk 'ref': -2“ - AR-72764
  • USB Remote wake-up feature support (2020 release) - AR-76750
  • USB Remote wake-up feature support (2021.1 and later release) - AR-76949


Host Mode

ZCU102 board jumper settings for Host mode
J7 - ON
J113 - 1-2
J110 - 2-3

Please refer the below image for jumper settings on ZCU102 board


USB 3.0 Host mode setup snapshot



Kernel Configuration

Device Drivers------>
    USB support
        <*> xHCI HCD (USB 3.0) support
        <*> USB Mass Storage support
        <*> DesignWare USB3 DRD Core Support
        DWC3 Mode Selection (Dual Role mode)  --->
            (X) Dual Role mode

By enabling the above we need to see the below mentioned Kconfig parameter enabled
CONFIG_USB_DWC3 = y
CONFIG_USB_DWC3_DUAL_ROLE = y
CONFIG_USB_SUPPORT=y
CONFIG_USB_COMMON=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_XHCI_PLATFORM=y

Devicetree

usb0: usb0@ff9d0000 {
	#address-cells = <2>;
	#size-cells = <2>;
	status = "disabled";
	compatible = "xlnx,zynqmp-dwc3";
	reg = <0x0 0xff9d0000 0x0 0x100>;
	clock-names = "bus_clk", "ref_clk";
	power-domains = <&zynqmp_firmware PD_USB_0>;
	ranges;
	nvmem-cells = <&soc_revision>;
	nvmem-cell-names = "soc_revision";

	dwc3_0: dwc3@fe200000 {
		compatible = "snps,dwc3";
		status = "disabled";
		reg = <0x0 0xfe200000 0x0 0x40000>;
		interrupt-parent = <&gic>;
		interrupt-names = "dwc_usb3", "otg", "hiber";
		interrupts = <0 65 4>, <0 69 4>, <0 75 4>;
		#stream-id-cells = <1>;
		iommus = <&smmu 0x860>;
		snps,quirk-frame-length-adjustment = <0x20>;
		snps,refclk_fladj;
		snps,enable_guctl1_resume_quirk;
		snps,enable_guctl1_ipd_quirk;
		snps,xhci-stream-quirk;
		/* dma-coherent; */
		/* snps,enable-hibernation; */
	};
};
 
&usb0 {
    status = "okay";
};
 
&dwc3_0 {
    status = "okay";
    dr_mode = "host";
};

Test Procedure

Connect the USB 3.0/2.0 pendrive to USB 3.0 capable board and see it getting detected in /dev/sd<x>.

Expected Output

Once Linux boots the below highlighted prints should be visible when we connected the mass storage device
84943.023896] usb 2-1: new SuperSpeed USB device number 4 using xhci-hcd
 
[84943.044949] usb 2-1: New USB device found, idVendor=0781, idProduct=5581
 
[84943.051579] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
 
[84943.058695] usb 2-1: Product: SanDisk Ultra
 
[84943.062858] usb 2-1: Manufacturer: SanDisk
 
[84943.066939] usb 2-1: SerialNumber: A20037A3AD063355
 
[84943.072653] usb-storage 2-1:1.0: USB Mass Storage device detected
 
[84943.078836] scsi host1: usb-storage 2-1:1.0
 
[84944.080804] scsi 1:0:0:0: Direct-Access SanDisk SanDisk Ultra PMAP PQ: 0 ANSI: 6
 
[84944.089531] sd 1:0:0:0: [sda] 30283008 512-byte logical blocks: (15.5 GB/14.4 GiB)
 
[84944.097708] sd 1:0:0:0: [sda] Write Protect is off
 
[84944.103904] sd 1:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
 
[84944.309725] sda:
 
[84944.312888] sd 1:0:0:0: [sda] Attached SCSI removable disk
 

Performance

When Mass Storage device is connected
Device used :
USB 3.0 : HP USB 3.0 16 GB pendrive (idVendor=03f0, idProduct=4840)
USB 3.0 - UASP capable drive - Transcend Storjet 128GB
USB 2.0 : Sandisk Cruzer Blade USB 2.0 8 GB Pendrive (idVendor=0781, idProduct=5567)

Using HDPARM tool
ModeSpeed
USB 3.0 (Super Speed)128 MB/sec
USB 3.0 (UASP capable)327.10 MB/sec
USB 2.0 (High Speed)25.48 MB/sec

Note : Above results may vary from device to device

When Ethernet device is connected
Device used :
USB 3.0/2.0 : Xilinx ZynqMP RNDIS/Ethernet Gadget

Using Iperf tool (TCP)
ModeSpeed
USB 3.0 (Super Speed)761.6 Mbits/sec
USB 2.0 (High Speed)467.2 Mbits/sec

Using Iperf tool (UDP)
ModeSpeed
USB 3.0 (Super Speed)761.6 Mbits/sec
USB 2.0 (High Speed)467.2 Mbits/sec

Note : The above results are taken with LPM mode disabled

Peripheral Mode

ZCU102 jumper settings for Peripheral mode
J7 - OFF
J113 - 1-2
J110 - 1-2

J109- No jumper


Please refer the below image for jumper settings required for peripheral mode on ZCU102 board


USB 3.0 peripheral mode setup snapshot

This document only explains the USB 3.0 peripheral mode configurations for MASS STORAGE gadget or ETHERNET Gadget profiles.

Mass Storage

Kernel Configuration

Device Drivers-------->
    USB support
        <*> USB Gadget Support
            <M>   USB Gadget Drivers
            <M>   Gadget Filesystem
            <M>   Mass Storage Gadget
File systems  --->
    Pseudo filesystems  --->
        {M} Userspace-driven configuration filesystem

By enabling the above we need to see the below mentioned Kconfig parameter enabled
CONFIG_USB_DWC3 = y
CONFIG_USB_DWC3_DUAL_ROLE = y
CONFIG_USB_SUPPORT=y
CONFIG_USB_COMMON=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_XHCI_PLATFORM=y

CONFIG_CONFIGFS_FS=m
CONFIG_USB_GADGET=y
CONFIG_USB_LIBCOMPOSITE=m
CONFIG_USB_F_MASS_STORAGE=m
CONFIG_USB_CONFIGFS=m
CONFIG_USB_CONFIGFS_MASS_STORAGE=y

Please find the required .ko files in the below mentioned paths:

linux-xlnx/fs/configfs/configfs.ko
linux-xlnx/drivers/usb/gadget/libcomposite.ko
linux-xlnx/drivers/usb/gadget/legacy/gadgetfs.ko
linux-xlnx/drivers/usb/gadget/function/usb_f_mass_storage.ko
linux-xlnx/drivers/usb/gadget/legacy/g_mass_storage.ko

Devicetree

usb0: usb0@ff9d0000 {
	#address-cells = <2>;
	#size-cells = <2>;
	status = "disabled";
	compatible = "xlnx,zynqmp-dwc3";
	reg = <0x0 0xff9d0000 0x0 0x100>;
	clock-names = "bus_clk", "ref_clk";
	power-domains = <&zynqmp_firmware PD_USB_0>;
	ranges;
	nvmem-cells = <&soc_revision>;
	nvmem-cell-names = "soc_revision";

	dwc3_0: dwc3@fe200000 {
		compatible = "snps,dwc3";
		status = "disabled";
		reg = <0x0 0xfe200000 0x0 0x40000>;
		interrupt-parent = <&gic>;
		interrupt-names = "dwc_usb3", "otg", "hiber";
		interrupts = <0 65 4>, <0 69 4>, <0 75 4>;
		#stream-id-cells = <1>;
		iommus = <&smmu 0x860>;
		snps,quirk-frame-length-adjustment = <0x20>;
		snps,refclk_fladj;
		snps,enable_guctl1_resume_quirk;
		snps,enable_guctl1_ipd_quirk;
		snps,xhci-stream-quirk;
		/* dma-coherent; */
		/* snps,enable-hibernation; */
	};
};
 
&usb0 {
    status = "okay";
};
 
&dwc3_0 {
    status = "okay";
    dr_mode = "peripheral";
};

Performance

Using HDPARM tool (Linux Host)
Link Power Management (LPM) mode Enable
ModeSpeed
USB 3.0 (Super Speed)127.18 MB/sec
USB 2.0 (High Speed)38.82 MB/sec

Link Power Management (LPM) mode Disable
ModeSpeed
USB 3.0 (Super Speed)237 MB/sec
USB 2.0 (High Speed)38.47 MB/sec

Testing Procedure

Please use the below settings for configuring USB as MASS STORAGE profile in device mode:
insmod configfs.ko
 
insmod libcomposite.ko
 
insmod usb_f_mass_storage.ko
 
insmod gadgetfs.ko
 
dd if=/dev/zero of=/tmp/mydev count=256 bs=1M
 
insmod g_mass_storage.ko file=/tmp/mydev removable=1 stall=1 iSerialNumber=7ABC7ABC7ABC7ABC7ABC7ABC
 

Testing the mass storage functionality by connecting the board to host using the below steps:
  1. Connect the cable from board to windows host machine
  2. Format the mass storage device that got detected in windows
  3. The windows screen shot when we the device gets detected should be as below
  4. The board will be detected as mass storage drive with size 256 MB.
  5. Copy some files into the mass storage drive , remove the cable and connect it again. We should be able to see the files that we copied into the drive.

Ethernet Gadget

Kernel Configuration

For the xilinx-v2016.2 and prior tags, apply the following patch.


USB support----->
    <*> USB Gadget Support
        <M>   USB Gadget Drivers
        <M>   Gadget Filesystem
        <M>   Ethernet Gadget (with CDC Ethernet support)
            [*]       RNDIS support
File systems  --->
    Pseudo filesystems  --->
        {M} Userspace-driven configuration filesystem
By enabling the above we need to see the below mentioned Kconfig paramter enabled
CONFIG_USB_DWC3 = y
CONFIG_USB_DWC3_DUAL_ROLE = y
CONFIG_USB_SUPPORT=y
CONFIG_USB_COMMON=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_XHCI_PLATFORM=y

CONFIG_CONFIGFS_FS=m
CONFIG_USB_GADGET=y
CONFIG_USB_LIBCOMPOSITE=m
CONFIG_USB_ETH=m
CONFIG_USB_ETH_RNDIS=y

Please find the required .ko files in the below mentioned paths:
linux-xlnx/fs/configfs/configfs.ko
linux-xlnx/drivers/usb/gadget/libcomposite.ko
linux-xlnx/drivers/usb/gadget/legacy/gadgetfs.ko
linux-xlnx/drivers/usb/gadget/function/u_ether.ko
linux-xlnx/drivers/usb/gadget/function/usb_f_rndis.ko

Devicetree

usb0: usb0@ff9d0000 {
	#address-cells = <2>;
	#size-cells = <2>;
	status = "disabled";
	compatible = "xlnx,zynqmp-dwc3";
	reg = <0x0 0xff9d0000 0x0 0x100>;
	clock-names = "bus_clk", "ref_clk";
	power-domains = <&zynqmp_firmware PD_USB_0>;
	ranges;
	nvmem-cells = <&soc_revision>;
	nvmem-cell-names = "soc_revision";

	dwc3_0: dwc3@fe200000 {
		compatible = "snps,dwc3";
		status = "disabled";
		reg = <0x0 0xfe200000 0x0 0x40000>;
		interrupt-parent = <&gic>;
		interrupt-names = "dwc_usb3", "otg", "hiber";
		interrupts = <0 65 4>, <0 69 4>, <0 75 4>;
		#stream-id-cells = <1>;
		iommus = <&smmu 0x860>;
		snps,quirk-frame-length-adjustment = <0x20>;
		snps,refclk_fladj;
		snps,enable_guctl1_resume_quirk;
		snps,enable_guctl1_ipd_quirk;
		snps,xhci-stream-quirk;
		/* dma-coherent; */
		/* snps,enable-hibernation; */
	};
};
 
&usb0 {
    status = "okay";
};
 
&dwc3_0 {
    status = "okay";
    dr_mode = "peripheral";
};

Performance

Iperf tool (TCP)
ModeSpeed
USB 3.0 (Super Speed)761.6 Mbits/sec
USB 2.0 (High Speed)467.2 Mbits/sec

Iperf tool (UDP)
ModeSpeed
USB 3.0 (Super Speed)761.6 Mbits/sec
USB 2.0 (High Speed)467.2 Mbits/sec

Testing Procedure

Please use the below settings for configuring USB as ETHERNET gadget profile in device mode:
insmod configfs.ko
 
insmod libcomposite.ko
 
insmod u_ether.ko
 
insmod usb_f_rndis.ko
 
mount -t configfs none /sys/kernel/config
 
cd /sys/kernel/config/usb_gadget
 
mkdir g1
 
cd g1
 
echo "64" > bMaxPacketSize0
 
echo "0x200" > bcdUSB
 
echo "0x100" > bcdDevice
 
echo "0x03FD" > idVendor
 
echo "0x0502" > idProduct
 
mkdir configs/c1.1
 
mkdir functions/rndis.rn0
 
ln -s functions/rndis.rn0/ configs/c1.1/
 
echo "fe200000.dwc3" > UDC
 
ifconfig usb0 10.10.70.1
 
ifconfig usb0 up
 

Testing the ethernet gadget by connecting to linux/windows machine:
  1. Connect the cable from board to windows/linux host machine
  2. Set the ipaddress on device side
    systest# ifconfig usb0 192.168.1.200
  3. Set the ipaddress on host side
  4. ping host address from device side and the result should be ass below mentioned
    ping <host address>

Expected Output:



USB Attached SCSI Protocol(UASP)

Limitation
TCM MODULE USED FOR UASP does not support ATA_12 commands. so user needs to change VID and PID in file drivers/usb/gadget/legacy/tcm_usb_gadget.c as below
#define UAS_VENDOR_ID 0x0bc2
#define UAS_PRODUCT_ID 0xa013

Kernel Configuration

Device Drivers  --->
    <*> Generic Target Core Mod (TCM) and ConfigFS Infrastructure  --->
        --- Generic Target Core Mod (TCM) and ConfigFS Infrastructure
        <*>   TCM/IBLOCK Subsystem Plugin for Linux/BLOCK
        <*>   TCM/FILEIO Subsystem Plugin for Linux/VFS
        <*>   TCM/pSCSI Subsystem Plugin for Linux/SCSI
        <*>   TCM/USER Subsystem Plugin for Linux
        <*>   TCM Virtual SAS target and Linux/SCSI LDD fabric loopback module
        <*>   Linux-iSCSI.org iSCSI Target Mode Stack
    [*] USB support  --->
         <*> USB Gadget Support
            <*>   USB functions configurable through configfs
            [*]     USB Gadget Target Fabric
            <M>     USB Gadget Target Fabric Module

KCONFIG options for UASP profile
CONFIG_USB_DWC3 = y
CONFIG_USB_DWC3_DUAL_ROLE = y
CONFIG_USB_SUPPORT=y
CONFIG_USB_COMMON=y
CONFIG_USB_ARCH_HAS_HCD=y
CONFIG_USB=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_XHCI_PLATFORM=y

CONFIG_CONFIGFS_FS=m
CONFIG_USB_GADGET=y
CONFIG_USB_LIBCOMPOSITE=m
CONFIG_USB_CONFIGFS=m
CONFIG_BLK_DEV_INTEGRITY=y
CONFIG_TARGET_CORE=y
CONFIG_TCM_IBLOCK=y
CONFIG_TCM_FILEIO=y
CONFIG_TCM_PSCSI=y
CONFIG_TCM_USER2=y
CONFIG_LOOPBACK_TARGET=y
CONFIG_ISCSI_TARGET=y
CONFIG_USB_F_TCM=y
CONFIG_USB_CONFIGFS_F_TCM=y
CONFIG_USB_GADGET_TARGET=m
CONFIG_CRC_T10DIF=y

Devicetree

Example Device tree node:
&dwc3_0 {
  status = "okay";
  dr_mode = "peripheral";
}
Please find the required .ko files in the below mentioned paths:
linux-xlnx/fs/configfs/configfs.ko
linux-xlnx/drivers/usb/gadget/libcomposite.ko
linux-xlnx/drivers/usb/gadget/legacy/gadgetfs.ko
linux-xlnx/drivers/usb/gadget/legacy/tcm_usb_gadget.ko

Performance

HDPARM Tool (UBUNTU Host)
Link Power Management (LPM) modeResult
Enabled367.77 MB/sec
Disabled381.42 MB/sec

Test procedure

Connect the USB 3.0 cable to linux PC and perform the steps given below on the device side

Install module
modprobe tcm_usb_gadget

Mount the configfs
mount a -t configfs /sys/kernel/config

Create a memory that will be assigned to gadget (here creating memory of 750MB)
mkdir /root
dd if=/dev/zero of=/root/file.bin bs=10M count=75
 

Format the memory that just has been created
mkdosfs -v /root/file.bin -n ramfs

Assign memory to gadget module
mkdir -p /sys/kernel/config/target/core/fileio_0/fileio
echo "fd_dev_name=/root/file.bin,fd_dev_size=734003200" > /sys/kernel/config/target/core/fileio_0/fileio/control
echo 1 > /sys/kernel/config/target/core/fileio_0/fileio/enable
mkdir -p /sys/kernel/config/target/usb_gadget/naa.6001405c3214b06a/tpgt_1
mkdir /sys/kernel/config/target/usb_gadget/naa.6001405c3214b06a/tpgt_1/lun/lun_0
echo naa.6001405c3214b06a > /sys/kernel/config/target/usb_gadget/naa.6001405c3214b06a/tpgt_1/nexus
ln -s /sys/kernel/config/target/core/fileio_0/fileio /sys/kernel/config/target/usb_gadget/naa.6001405c3214b06a/tpgt_1/lun/lun_0/virtual_scsi_port
 

Change max busrt to get maximum performance
echo 15 > /sys/kernel/config/target/usb_gadget/naa.6001405c3214b06a/tpgt_1/maxburst

Connect device to Host
echo 1 > /sys/kernel/config/target/usb_gadget/naa.6001405c3214b06a/tpgt_1/enable

Ubuntu
On performing the steps given above, below prints should be shown on host side on typing "dmesg"



Do data transfer on HOST(UBUNTU) side



Windows
Note: UASP is supported from windows 8

On windows need to follow below steps in order to mount device

1. open manage by right click on Desktop (screen shot as below)



2. open disk management and format the device (screen shot as below)




3. It will mount the device as drive
4. Do data transfer


OTG Mode

Using the correct cables is the key to OTG operation. Testing was done using two cables joined together to create an OTG cable. An OTG cable has a micro A connector on one end and a micro B connector on the other end. The micro A connector is the host side of the cable and the micro B connector is the device side by default.

Hardware Setup
Boards: ZynqMP ZCU102 (2 boards back to back connected)
Host Machine: Linux Machine with USB 3.0 ports

Kernel Configuration

Linux Kernel image with xHCI Host enabled (static) and Mass Storage Gadget created as dynamic module
  • Boot image for initial FSBL sequence
  • Device tree with DWC USB OTG mode enabled
Steps to enable OTG in Linux Kernel (add below configurations via menuconfig)
  • CONFIG_PM=y
  • CONFIG_USB_OTG=y
  • CONFIG_USB_OTG_FSM=y
  • CONFIG_USB_DWC3_OTG=y
After this compile the kernel, install modules in it and create kernel Image.

Test Procedure

  • When the Linux kernel boots up, give the below commands:
$ dd if=/dev/zero of=/tmp/mydev count=256 bs=1M
$ modprobe g_mass_storage file=/tmp/mydev removable=1 stall=1 iSerialNumber=7ABC7ABC7ABC7ABC7ABC7ABC

Peripheral Mode
  • Connect board to any Host PC via USB Std-A-Male to Micro-B-Male cable.
  • It should be detected as a Mass Storage Device
  • Do some data transfers

Host Mode
  • Connect any pen-drive with the board via USB Micro-A-Male to Std-A-Female type connector
  • Check that the pen-drive is detected properly
  • Do some data transfers.

HNP & SRP
  • When two boards (OTG enabled) are connected back to back, OTG 2.0 supports HNP and SRP
  • To start HNP from the Device, issue below command
    • $ echo 1 > /sys/devices/platform/amba/ff9d0000.usb0/fe200000.dwc3/hnp
  • Please check the role reversal on both the boards
  • To start SRP from the Device, issue below command
    • $ echo 1 > /sys/devices/platform/amba/ff9d0000.usb0/fe200000.dwc3/srp

Note : Both Host and Peripheral mode should work without resetting/rebooting the board.

Mainline Status

The current driver available in the Xilinx Linux git is in sync with the open-source 6.1 kernel driver except for the following:
- USB Hibernation feature,
- USB Remote wakeup feature,
- USB OTG feature,
- Suspend-Resume feature.

Phy Settings

This USB controller on Zynq UltraScale+ MPSoC is connected to High Speed GTR through PIPE3 interface. This phy requires a reference clock to operate with USB 3.0, which can be
configured to anyone among 26MHz, 52 MHz, and 100MHz. On the ZCU102 board, this is factory programmed to 26MHz.

Change log

2023.2

  • None

2023.1

  • kernel upgrade to 6.1
  • Added reset-controller support for versal platform
  • Added power-domains property support

2022.2

  • None

2022.1

  • kernel upgrade to 5.15

2021.2

  • None

2021.1

2020.2

  • None

2020.1

  • kernel upgrade to 5.4

2019.2

  • Add support for disabling U1 and U2 entries
  • Add support for masking phy reset signal
  • Add wakeup capability support for versal usb controller
  • Add D0/D3 entry/exit  support for versal
2019.1
  • Start timer per request instead of per endpoint
  • Correct the logic for checking TRB full in __dwc3_prepare_one_trb()
  • Check for IOC/LST bit in both event->status and TRB->ctrl fields
  • Check MISSED ISOC bit only for ISOC endpoints
  • Don't kick transfer if LST or SHORT bits are set
  • make otg driver work along with drd driver
  • mask host/device soft reset from affecting the phy
  • Add user event for ending hnp session
  • Add DRD support for versal
  • route lpd usb traffic through CCI path for making SMMU work
  • Fixed BUS Expiries for Iscoronous transfers when using usb video class



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