Guennadi Liakhovetski wrote:
On Thu, 25 Jun 2009, Valentin Longchamp wrote:
Hello,
I am using the fsl_usb2_udc driver on my mx31 system (mx31moboard, support in
the kernel). I mostly use it as g_ehter gadget because we do not have a real
ethernet device on our board. We use ISP1504 Phy transceivers.
Now I have a systematic problem at kernel boot: as soon as I register the
platform_device and until the fsl_usb2_udc module is loaded, the USB bus is
blocked (this for example means that I cannot use the USB mouse and keyboard
on the computer my board is plugged into). This only happens when I do a "warm
reboot" and I was thinking maybe we do something wrong in the fsl_usb2_udc
driver, especially at fsl_udc_remove. We could maybe add a call that disables
the physical transceiver, the equivalent to the dr_controller call in
fsl_udc_probe.
Looks like the pull-up stays connected over reset.
Mmmmmhhh, I do not enable any pull-up on this device. Maybe I could
change this. I will try to change something here.
Of course, I already have a workaround having fsl_usb2_udc built in the kernel
and not as a module: the driver is registered very quickly after the usb_udc
platforme_device and I don't notice the USB bus being blocked (maybe is it
very short but still happens). But I think this problem should not happend,
even with fsl_usb2_udc built as module.
I also wanted to ask the people who use this driver on mx31 (or maybe another
platform, because it is available for other Freescale SoCs) if they already
have noticed this kind of behavior ?
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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Thanks
Val
--
Valentin Longchamp, PhD Student, EPFL-STI-LSRO1
valentin.longchamp@xxxxxxx, Phone: +41216937827
http://people.epfl.ch/valentin.longchamp
MEA3485, Station 9, CH-1015 Lausanne
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