In our custom imx6ull board, we use USB_OTG2 as usb host connect to 4G modem, and USB_OTG1 as usb host connect to a USB typeA interface.
In most case USB_OTG1 can success recognize a inserted Udisk, and there is a 3% probability that cannot recognize. when in that abnormal situation, we try a lot unplug and insert, but the Udisk was not successfully recognized even once， we also try other usb device,eg. USB mouse, other brand Udisk is the same. And in that abnormal situation，USB_OTG2 can success to recognize unplug and insert 4G modem.
root@Router:/etc# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
So in the beginning we think this mybe a hardware issue, because there is only 5% probability custom imx6ull board exist this issue，but in that abnormal situation if we try "rmmod ci_hdrc_imx" and then "modprobe ci_hdrc_imx" (sometime need try twice)，USB_OTG1 can success to recognize the Udisk. So now i think there may be also a "ci_hdrc_imx" driver bug.
root@Router:~# lsmod
Module Size Used by
ci_hdrc_imx 16384 0
ci_hdrc 57344 1 ci_hdrc_imx
ehci_hcd 53248 1 ci_hdrc
usbmisc_imx 20480 1 ci_hdrc_imx
evbug 16384 0
root@Router:~# rmmod ci_hdrc_imx
[ 122.118951] ci_hdrc ci_hdrc.1: remove, state 4
[ 122.123437] usb usb2: USB disconnect, device number 1
[ 122.140736] ci_hdrc ci_hdrc.1: USB bus 2 deregistered
[ 122.161250] ci_hdrc ci_hdrc.0: remove, state 1
[ 122.236537] hub 1-0:1.0: activate --> -108
[ 122.240753] usb usb1: USB disconnect, device number 1
[ 122.274650] ci_hdrc ci_hdrc.0: USB bus 1 deregistered
root@Router:~#
root@Router:~#
root@Router:~#
root@Router:~#
root@Router:~# modprobe ci_hdrc_imx
[ 133.404398] imx_usb 2184000.usb: No over current polarity defined
[ 133.416681] imx_usb 2184000.usb: 2184000.usb supply vbus not found, using dummy regulator
[ 133.466688] ci_hdrc ci_hdrc.0: EHCI Host Controller
[ 133.471663] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[ 133.506583] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[ 133.513254] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[ 133.532438] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 133.543649] usb usb1: Product: EHCI Host Controller
[ 133.550679] usb usb1: Manufacturer: Linux 5.4.24 ehci_hcd
[ 133.558568] usb usb1: SerialNumber: ci_hdrc.0
[ 133.581312] hub 1-0:1.0: USB hub found
[ 133.585190] hub 1-0:1.0: 1 port detected
[ 133.615430] imx_usb 2184200.usb: 2184200.usb supply vbus not found, using dummy regulator
[ 133.652481] ci_hdrc ci_hdrc.1: EHCI Host Controller
[ 133.666850] ci_hdrc ci_hdrc.1: new USB bus registered, assigned bus number 2
[ 133.716535] ci_hdrc ci_hdrc.1: USB 2.0 started, EHCI 1.00
[ 133.729739] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[ 133.746536] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 133.753787] usb usb2: Product: EHCI Host Controller
[ 133.776502] usb usb2: Manufacturer: Linux 5.4.24 ehci_hcd
[ 133.781954] usb usb2: SerialNumber: ci_hdrc.1
[ 133.818004] hub 2-0:1.0: USB hub found
[ 133.821877] hub 2-0:1.0: 1 port detected
root@Router:~# [ 133.966498] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[ 134.018888] usb 1-1: New USB device found, idVendor=14cd, idProduct=2536, bcdDevice= 3.00
[ 134.036431] usb 1-1: New USB device strings: Mfr=1, Product=3, SerialNumber=2
[ 134.043593] usb 1-1: Product: Mass Storage Device
[ 134.066523] usb 1-1: Manufacturer: Generic USB Device
[ 134.072036] usb 1-1: SerialNumber: 2536201609180000
[ 134.089037] usb-storage 1-1:1.0: USB Mass Storage device detected
[ 134.117513] scsi host0: usb-storage 1-1:1.0
[ 135.207983] scsi 0:0:0:0: Direct-Access Mass Storage Device 1.00 PQ: 0 ANSI: 0 CCS
[ 135.240656] sd 0:0:0:0: [sda] 31105024 512-byte logical blocks: (15.9 GB/14.8 GiB)
[ 135.267407] sd 0:0:0:0: [sda] Write Protect is off
[ 135.284889] sd 0:0:0:0: [sda] No Caching mode page found
[ 135.306656] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 135.346777] sda: sda1
[ 135.359644] sd 0:0:0:0: [sda] Attached SCSI removable disk
[ 138.063436] FAT-fs (sda1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
Here is
our Dts
pinctrl_usb_otg1: usbotg1grp {
fsl,pins = <
MX6UL_PAD_GPIO1_IO00__ANATOP_OTG1_ID 0x17059
MX6UL_PAD_GPIO1_IO01__USB_OTG1_OC 0x17059
>;
};
&usbotg1 {
dr_mode = "otg";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usb_otg1>;
status = "okay";
};
our hareware sch:
Our kernel:
https://source.codeaurora.org/external/imx/linux-imx
banch remotes/origin/imx_5.4.24_2.1.0
Any suggestions are appreciated，thanks
Thank you for your reply, @weidong_sun
Sorry for our incomplete information.
1、indeed USB OTG1 ID PIN was allready low at that time（SW1.6 is off ），
and we also sew the USB OTG1 root hub at that time.
root@Router:/etc# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
2、"+5V" on board is directly conencted to USB_OTG1_VBUS pin， and indirectly conencted to USB TYPE-AF connector's VBUS pin through a current limiting IC. we checked no voltage drop with “+5V” at that time.
So @weidong_sun we don't really think this problem is a fully hardware issue, beacuse if we try uninstall and then install driver ci_hdrc_imx("rmmod ci_hdrc_imx" and then "modprobe ci_hdrc_imx")， USB OTG1 became work well.
Any one have suggestions ？
