USB 2.0 on USB host port on i.mx8m

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USB 2.0 on USB host port on i.mx8m

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Contributor V

Hello, NXP team:

We have a custom board based on i.mx8m.

We use the USB 2.0 connect so we only route USB 2.0 signal to USB connector on USB host port.

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I test 5 different USB 3.0 flash drives:

1.Sandisk Ultra USB 3.0- 16GB :  OK
2.Kingston DataTraveler 3.0 -16GB : can't be formatted or written.
3.Verbatim STORE N GO - 64GB : can't be formatted or written.
4.TS-RDF5  SD  Transcend (Transcend USB 3.0 card reader) : OK
5.JetFlash Transcend 16GB : OK

2 of them can't be formatted.

When there is problem, there is error message shows:

"[   56.559920] usb 1-1: reset high-speed USB device number 2 using xhci-hcd"

I suspect the problem is caused by that the driver of XHCI controller can't switch to USB 2.0 mode when hand-shaking.

Do you know what is the problem?

How can i force XHCI controller to operate on USB 2.0 instead of USB 3.0?

The error log is as below:

[ 1411.879438] usb 1-1: new high-speed USB device number 5 using xhci-hcd
[ 1412.040330] usb-storage 1-1:1.0: USB Mass Storage device detected
[ 1412.053005] scsi host0: usb-storage 1-1:1.0
[ 1413.073907] scsi 0:0:0:0: Direct-Access Kingston DataTraveler 3.0 PQ: 0 ANSI: 6
[ 1413.083752] sd 0:0:0:0: [sda] 30218842 512-byte logical blocks: (15.5 GB/14.4 GiB)
[ 1413.092549] sd 0:0:0:0: [sda] Write Protect is off
[ 1413.098137] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 1413.112856] sda: sda1
[ 1413.118122] sd 0:0:0:0: [sda] Attached SCSI removable disk

# mkfs.ext4 /dev/sda1
mke2fs 1.43.4 (31-Jan-2017)
Creating filesystem with 3777099 4k blocks and 944704 inodes
Filesystem UUID: 3240b005-8829-416c-b3f6-c84fd75d3101
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Allocating group tables: done
Writing inode tables: done
Creating journal (16384 blocks): done
Writing superblocks and filesystem accounting information: [ 1449.199376] usb 1-1: reset high-speed USB device number 5 using xhci-hcd
[ 1481.967362] usb 1-1: reset high-speed USB device number 5 using xhci-hcd

[ 1481.967362] usb 1-1: reset high-speed USB device number 5 using xhci-hcd
[ 1514.735369] usb 1-1: reset high-speed USB device number 5 using xhci-hcd

[ 1481.967362] usb 1-1: reset high-speed USB device number 5 using xhci-hcd
[ 1514.735369] usb 1-1: reset high-speed USB device number 5 using xhci-hcd
[ 1545.455371] usb 1-1: reset high-speed USB device number 5 using xhci-hcd

Thank you~!!!

BR,

Richard

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Contributor V

This issue can be reproduced on i.mx8mq EVK board easily.

I connect USB flash driver to USB 3.0 host port on EVK board via USB 2.0 extension cord.

Then this issue also happens.

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P80712-133138.jpg

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Software version:  linux 4.9.51-mx8-ga, linux 4.9.88

The log is as below:

NXP i.MX Release Distro 4.9.51-mx8-ga imx8mqevk ttymxc0

imx8mqevk login: root
Last login: Fri Mar 30 15:54:09 UTC 2018 on tty7
root@imx8mqevk:~# [   12.743789] usb 1-1: new high-speed USB device number 2 using xhci-hcd
[   12.905254] usb-storage 1-1:1.0: USB Mass Storage device detected
[   12.914205] scsi host0: usb-storage 1-1:1.0
[   13.945590] scsi 0:0:0:0: Direct-Access     Kingston DataTraveler 3.0      PQ: 0 ANSI: 6
[   13.957102] sd 0:0:0:0: [sda] 30218842 512-byte logical blocks: (15.5 GB/14.4 GiB)
[   13.965506] sd 0:0:0:0: [sda] Write Protect is off
[   13.971054] sd 0:0:0:0: [sda] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[   13.984333]  sda: sda1
[   13.990179] sd 0:0:0:0: [sda] Attached SCSI removable disk

root@imx8mqevk:~# lsblk
NAME         MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
mmcblk0rpmb  179:96   0  128K  0 disk
mtdblock0     31:0    0   32M  0 disk
mmcblk0boot0 179:32   0    4M  1 disk
sda            8:0    1 14.4G  0 disk
`-sda1         8:1    1 14.4G  0 part
mmcblk0boot1 179:64   0    4M  1 disk
mmcblk0      179:0    0 13.8G  0 disk
|-mmcblk0p2  179:2    0  1.6G  0 part /
`-mmcblk0p1  179:1    0   32M  0 part /run/media/mmcblk0p1
root@imx8mqevk:~# mkfs.ext4 /dev/sda1
mke2fs 1.43 (17-May-2016)
Creating filesystem with 3777099 4k blocks and 944704 inodes
Filesystem UUID: 12978eb3-539b-4f15-bb35-cdf93b21f065
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208

Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information:

[   66.779880] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
[   99.547888] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
[  130.267831] usb 1-1: reset high-speed USB device number 2 using xhci-hcd

[  163.035891] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
[  195.803889] usb 1-1: reset high-speed USB device number 2 using xhci-hcd

[  228.571886] usb 1-1: reset high-speed USB device number 2 using xhci-hcd
[  242.776341] INFO: task kworker/u8:4:344 blocked for more than 120 seconds.
[  242.783295]       Tainted: G           O    4.9.51-imx_4.9.51_imx8m_ga+g6df7474 #1
[  242.791009] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[  242.798964] kworker/u8:4    D    0   344      2 0x00000000
[  242.804603] Workqueue: writeback wb_workfn (flush-8:0)
[  242.809888] Call trace:
[  242.812465] [<ffff000008085604>] __switch_to+0x8c/0xa0
[  242.817725] [<ffff000008c0af78>] __schedule+0x178/0x580
[  242.823069] [<ffff000008c0b3bc>] schedule+0x3c/0xa8
[  242.828070] [<ffff000008c0e1b4>] schedule_timeout+0x1bc/0x280
[  242.833936] [<ffff000008c0ad90>] io_schedule_timeout+0xa0/0x110
[  242.840179] [<ffff0000083b60a0>] get_request+0x3b0/0x688
[  242.845611] [<ffff0000083b8cd0>] blk_queue_bio+0xe8/0x2c8
[  242.851128] [<ffff0000083b6db0>] generic_make_request+0xd8/0x230
[  242.857247] [<ffff0000083b6fb4>] submit_bio+0xac/0x190

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