Hi Anand,

On Thu, Jun 17, 2021 at 9:42 PM Anand Moon [off-list ref] wrote:

On Odroid C1+ and Odroid C2 USB feature is broken

with "broken" you mean the hotplug and IRQ issues you describe below?
I think that these are not PHY related but rather a problem with the
dwc2 IP/driver

this code changes are just re-structure the code so that
proper callback function execute in proper order.

Code changes losely based on phy-meson-gxl-usb2.c

there's a big difference between the Meson8 and GXL drivers:
GXL requires changing some of the PHY registers at runtime based on
the mode (host/peripheral).
The Meson8 PHY however (as far as I can tell from the 3.10 and 3.14
kernels) don't require any runtime changes based on the mode.

Initially if we connect USB HDD at initial boot it get detected.
but after that usb hotplug of USB HDD is broken.
I did not observe and USB debug events messages to trace the root cause.

Another issue I observed is increase of USB interrupts event
even if there is not much activity on USB ports.
I tried some clk changes but it did not workout for me.

I suggest reporting this to the dwc2 maintainers and asking for advice
on how to debug these issues.


Best regards,
Martin

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