[meta-xilinx] zedboard usb issues

[Mike Looijmans]

On 10/31/2014 10:35 AM, Nathan Rossi wrote:
>> 

Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


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-----Original Message-----
>> From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-
>> bounces at yoctoproject.org] On Behalf Of Simon Vincent
>> Sent: Friday, October 31, 2014 12:48 AM
>> To: meta-xilinx at yoctoproject.org
>> Subject: [meta-xilinx] zedboard usb issues
>>
>> I have build a zedboard image using the latest xilinx-yocto but I am
>> having problems with the usb.
>>
>> I find that 50% of the time I get an error initialising the usb phy:
>> root at zedboard-zynq7:~# dmesg|grep -i usb
>> [    0.562406] usbcore: registered new interface driver usbfs
>> [    0.568243] usbcore: registered new interface driver hub
>> [    0.573986] usbcore: registered new device driver usb
>> [    1.314762] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>> [    1.329453] zynq-dr e0002000.ps7-usb: Unable to init USB phy, missing?
>> [    1.336866] usbcore: registered new interface driver usb-storage
>> [    1.461775] usbcore: registered new interface driver usbhid
>> [    1.469402] usbhid: USB HID core driver
>>
>> The rest of the time I get the following but no usb devices are
>> recognised:
>>
>> root at zedboard-zynq7:~# dmesg|grep -i usb
>> [    0.562418] usbcore: registered new interface driver usbfs
>> [    0.568255] usbcore: registered new interface driver hub
>> [    0.573981] usbcore: registered new device driver usb
>> [    1.314193] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
>> [    1.331922] Found TI TUSB1210 ULPI transceiver.
>> [    1.341299] zynq-ehci zynq-ehci.0: Xilinx Zynq USB EHCI Host Controller
>> [    1.348773] zynq-ehci zynq-ehci.0: new USB bus registered, assigned
>> bus number 1
>> [    1.405684] zynq-ehci zynq-ehci.0: USB 2.0 started, EHCI 1.00
>> [    1.418015] hub 1-0:1.0: USB hub found
>> [    1.429784] usbcore: registered new interface driver usb-storage
>> [    1.560122] usbcore: registered new interface driver usbhid
>> [    1.567687] usbhid: USB HID core driver
>>
>> If I boot using the sdcard image that came with the zedboard the USB
>> works every time and recognises usb devices.
>>
>> Has anyone else had problems with this?
>
> I have seen this before with other boards. It is caused when the USB PHY is not reset properly. I don't see the issue in my testing most likely due to FSBL and or U-Boot resetting the phy.

I have been using a patch for that for a while (the PHY reset in FSBL only 
worked for half the MIO pins). I was waiting for the VBUS patch to make it to 
Xilinx master-next before submitting that to Xilinx. There's also one in the 
ADI tree, but it uses much too loose timings for the reset pulse.

You can see my code here, this solved the PHY reset on all boards:
https://github.com/topic-embedded-products/linux/commit/7fb825c883e744c069a049ca4629c4664d2081af 



> Linux is able to reset the PHY, and I have a patch on my nrossi/next branch which should fix this issue you are seeing. Would you be able to give it a try and let me know the outcome?, the branch is at:
> https://github.com/nathanrossi/meta-xilinx/compare/nrossi/next