>
>
> 1st problem - RNDIS
> We try to use RNDIS on one of the USB ports the Colibri iMX6ULL has. For this
> purpose I'm using the usb_f_rndis.ko kernel module and setting dr_mode of
> &usbotg1 to "peripheral"
> This works fine on iMX7 but does not on iMX6ULL. On the ULL board I can see a
> "ci_hdrc.0" in /sys/class/udc after boot. If I add now an USB GPIO extcon to usbotg
> this changes to "ci_hdrc.1" and everything works fine after boot, but not after
> unplugging USB and replugging.
> To setup RNDIS I use the commands [1] I put at the end of this email for reference.
>
If the board designs for USB part are the same between iMX7 version and iMX6ULL version,
keep dts content are the same except for the USB PHY port (including the phandle for it),
these two SoCs uses the different USB PHY.
If the RNDIS could work at the first time, it seems your configfs script should be OK.
> 2nd problem - constant resetting
> When I compile a plain mainline kernel with "imx_v6_v7_defconfig" and boot the
> iMX6ULL with it I see that the USB is constantly resetting the hub that is present on
> the Colibri Evaluation carrier board.
>
> [ 49.654621] usb 1-1: reset high-speed USB device number 2 using
> ci_hdrc
> [ 52.180781] usb 1-1: reset high-speed USB device number 2 using
> ci_hdrc
> [ 54.699678] usb 1-1: reset high-speed USB device number 2 using
> ci_hdrc
>
Try to add external power to the USB HUB avoid the board can't supply enough power.
If not, try to disable runtime pm, and see if it works.
59 static const struct ci_hdrc_imx_platform_flag imx6ul_usb_data = {
60 .flags = CI_HDRC_SUPPORTS_RUNTIME_PM |
61 CI_HDRC_TURN_VBUS_EARLY_ON,
62 };
63
>
> This looks to me like something is still not quite right for the use- case of ULL. I
> doubt that our hardware is the problem as we never have seen those problems
> downstream.
You mean your hardware should be NO problem as the downstream code runs OK?
Peter
