* H. Nikolaus Schaller hns@goldelico.com [160920 23:53]:
Am 20.09.2016 um 22:57 schrieb Tony Lindgren tony@atomide.com: Just before hang I might get this on omap5-uevm:
hub 1-2:1.0: over-current condition
Interesting!
..
AFAIK, Ethernet is connected through HSIC3 to the LAN9730. And the USB ports are on HSIC2 for an USB3503.
Since the Ethernet chip should not be able to report any over-current condition, I think the USB3503 is reporting this.
Yes seems to come from the hub kernel code.
Both are powered by 3V3 from U3 (another TPS54426PWPR). So this SMPS is independent of the Palmas SMPS. AFAIR, these chips are specified to work for 4.5V and above. So a DC_IN dropping below 4.5V might send hickups to the 3V3 supply which mangle up EHCI.
The USB3503 has an OCS_N input connected to the 5V rail. I don't know where the threshold is where it thinks there is an over current... Maybe if this line drops below 4.5V?
Yeah maybe then it starts sucking more power or something.
PS: Pyra has no Ethernet and HSIC3 is unused. It has the USB3503 on HSIC2, but this is powered from VSYS and uses the internal 3V3 LDO.
Might be still checking on Pyra if it behaves better with ehci-omap and ohci-omap3 unloaded.
Regards,
Tony