I try to port coreboot on boards with Haswell CPU and Lynxpoint LP chipset (IBASE IB908AF-4650 board, DFI HU968) and I've encountered a strange problem. USB devices stop working shortly after OS boot (or after USB device replug in OS) with flooding system with messages:
hub 1-1:1.0: cannot reset port 5 (err = -110) hub 1-1:1.0: cannot reset port 5 (err = -110) hub 1-1:1.0: Cannot enable port 5. Maybe the USB cable is bad? hub 1-1:1.0: cannot disable port 5 (err = -110) hub 1-1:1.0: connect-debounce failed, port 5 disabled hub 1-1:1.0: unable to enumerate USB device on port 5 hub 1-1:1.0: cannot disable port 5 (err = -110) hub 1-1:1.0: hub_port_status failed (err = -110) hub 1-1:1.0: hub_port_status failed (err = -110)
Through some digging I've found out that this problem persist on kernels <3.5. I've investigated this problem more closely and come down to the fact that the kernel commit that solves this problem is:
3d9545c EHCI: maintain the ehci->command value properly
https://github.com/torvalds/linux/commit/3d9545cc375d117554a9b35dfddadf9189c 62775?diff=split
And now I'm kinda stuck. The effect of this commit doesn't seem to interface with bios for me. So how does original IBASE/DFI bios can overcome code error before this commit?
What can be the source of my problem? What should I investigate more precise based on result that I've got?