AM335x USB1 host problem

Steve Jacot-Guillarmod

Hello everybody,

We are developing a custom board based on the AM335x processor. We use linux kernel 3.14.33 with a custom device tree !

Every thing works as excepted, except the USB1 host port. This port is connected permanently to a 3 ports USB hub.

If I connect an usb drive (memory stick) before the startup (on the port1 of the hub), the drive is detected and everything works !

[    6.946938] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[    6.965023] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 2
[    6.991807] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[    6.999005] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    7.006622] usb usb2: Product: MUSB HDRC host driver
[    7.011833] usb usb2: Manufacturer: Linux 3.14.33 musb-hcd
[    7.017605] usb usb2: SerialNumber: musb-hdrc.1.auto
[    7.031379] hub 2-0:1.0: USB hub found
[    7.035361] hub 2-0:1.0: 1 port detected
[    7.507409] usb 2-1: new high-speed USB device number 2 using musb-hdrc
[    7.647479] usb 2-1: New USB device found, idVendor=0424, idProduct=2513
[    7.654513] usb 2-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    7.665286] hub 2-1:1.0: USB hub found
[    7.677425] hub 2-1:1.0: 3 ports detected
[    7.908006] net eth0: phy found : id is : 0x7c0f1
[    7.967349] usb 2-1.1: new high-speed USB device number 3 using musb-hdrc
[    8.077619] usb 2-1.1: New USB device found, idVendor=abcd, idProduct=1234
[    8.084859] usb 2-1.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[    8.092559] usb 2-1.1: Product: UDisk
[    8.097424] usb 2-1.1: Manufacturer: General
[    8.101994] usb 2-1.1: SerialNumber: 1406161132241318556211
[    8.116206] usb-storage 2-1.1:1.0: USB Mass Storage device detected
[    8.135041] scsi0 : usb-storage 2-1.1:1.0
[    9.138330] scsi 0:0:0:0: Direct-Access     General  UDisk            5.00 PQ: 0 ANSI: 2
[    9.156324] sd 0:0:0:0: [sda] 15728640 512-byte logical blocks: (8.05 GB/7.50 GiB)
[    9.166038] sd 0:0:0:0: Attached scsi generic sg0 type 0
[    9.177917] sd 0:0:0:0: [sda] Write Protect is off
[    9.197359] sd 0:0:0:0: [sda] No Caching mode page found
[    9.202976] sd 0:0:0:0: [sda] Assuming drive cache: write through
[    9.233464] sd 0:0:0:0: [sda] No Caching mode page found
[    9.239181] sd 0:0:0:0: [sda] Assuming drive cache: write through
[    9.252182]  sda: sda1
[    9.270256] sd 0:0:0:0: [sda] No Caching mode page found
[    9.275872] sd 0:0:0:0: [sda] Assuming drive cache: write through
[    9.282359] sd 0:0:0:0: [sda] Attached SCSI removable disk

But if I remove the usb key (I got a usb 2-1.1: USB disconnect, device number 3) and plug it again, nothing appends...

This is very strange... USB1_VBUS is always powered with a VCC 5V

I noticed another thing... if I do a echo on > /sys/bus/usb/devices/usb2/power/control and plug the key again, the device is detected (only one time)

Has some body an idea ?

Thank you in advance for your help !

Best regards

Steve

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Steve,

Please check this wiki for proper connections: http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist#USB

0 Steve Jacot-Guillarmod over 10 years ago in reply to Biser Gatchev-XID

Intellectual 300 points

Hello,

Thank you for your help. Our design was based on theses informations.

Best regards

Steve

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Steve Jacot-Guillarmod said:
This is very strange... USB1_VBUS is always powered with a VCC 5V

I posted this link because you said that you have a permanent +5V source attached to USB1_VBUS. Is this correct? Also, have you tried the TI distributed SDK 8.0?

0 Steve Jacot-Guillarmod over 10 years ago in reply to Biser Gatchev-XID

Intellectual 300 points

Hello,

No I only tested on meta-ti master. If I understand well, the USB1_DRVVBUS should command the VBUS 5V input ?
You think my problem is in correlation with that ?

Is there some where a schematic example of a AM335x with a USB host hub ?

0 Biser Gatchev-XID over 10 years ago in reply to Steve Jacot-Guillarmod

TI__Guru**** 393215 points

Steve Jacot-Guillarmod said:
If I understand well, the USB1_DRVVBUS should command the VBUS 5V input ?
You think my problem is in correlation with that ?

Yes, this is correct.

Steve Jacot-Guillarmod said:
Is there some where a schematic example of a AM335x with a USB host hub ?

There isn't a reference design with an on-board hub attached to USB Host port. You can try a transistor switch like this one to control voltage on USB1_VBUS:

0 Bin Liu over 10 years ago

TI__Guru**** 169101 points

Steve,

Does this 3.14.33 kernel come from kernel.org? You might need my patch "usb: musb: fix device hotplug behind hub" to fix this issue, please get the patch from .

Since you directly tied VBUS pin to 5V, you also need the following patch for host-only mode. This patch is for USB0 port, so please change "if (id == 0)" to "if (id == 1)" for USB1 port.

0 Steve Jacot-Guillarmod over 10 years ago in reply to Bin Liu

Intellectual 300 points

Hello,

Thank you for the information. Is use the kernel from : http://git.yoctoproject.org/cgit/cgit.cgi/meta-ti/?h=master

I've changed the hardware on the recommendation of Biser. But the detection still not work.

I'll look in the sources of my kernel if the bug is present.

Thank you for your help.

I keep you informed !

0 Steve Jacot-Guillarmod over 10 years ago in reply to Bin Liu

Intellectual 300 points

Hello,
I applied the patch "usb: musb: fix device hotplug behind hub" and everything works as excepted.
Now I've changed on our prototype the VBUS, based on the suggestion from Biser.

A big thank you both for your very efficient help !

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AM335x USB1 host problem