[meta-xilinx] zedboard usb issues

[Nathan Rossi]

> -----Original Message-----
> From: meta-xilinx-bounces at yoctoproject.org [mailto:meta-xilinx-
> bounces at yoctoproject.org] On Behalf Of Mike Looijmans
> Sent: Monday, November 03, 2014 4:48 PM
> To: meta-xilinx at yoctoproject.org
> Subject: Re: [meta-xilinx] zedboard usb issues
> 
> 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

This is what I was referring to regarding the kernel being able to reset the PHY. But as it turns out the linux-xlnx kernel only had this in the xlnx_3.8 tree (https://github.com/Xilinx/linux-xlnx/commit/53e868300ad63c52137f47fd762a660071f1fd4e), and the patch was never merged with the newer branches.

That patch looks good Mike, I have ported that change as a patch for the linux-xlnx_3.14 recipe. I have that on the nrossi/next branch, which I intend to merge by the end of the week.

@Simon: I have also resolved that toolchain error you were getting with the newer meta-xilinx with dizzy.

Regards,
Nathan

> 
> 
> 
> > 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
> 
> 
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