[coreboot] USB problem with Haswell+LynxPointLP motherboards

[Аладышев Константин]

Hello Zoran!

Yes, I'm working with the same board, but the problem is different. Last time I was solving a problem of OS suspend-resume sequence with modern kernels and now it is about working with old kernels

From: Zoran Stojsavljevic [mailto:zoran.stojsavljevic at gmail.com]
Sent: Tuesday, October 10, 2017 9:48 AM
To: Аладышев Константин
Cc: coreboot
Subject: Re: [coreboot] USB problem with Haswell+LynxPointLP motherboards

Hello Kostja,
We already had this discussion a while ago, didn't we?

https://mail.coreboot.org/pipermail/coreboot/2016-December/082772.html

(BTW, ATOM BYT has exactly the same problem)

Zoran

On Mon, Oct 9, 2017 at 11:58 AM, Аладышев Константин <aladyshev at nicevt.ru> wrote:
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?


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