Zitat von Thadeu Lima de Souza Cascardo <casca...@linux.vnet.ibm.com>:
On Mon, Apr 14, 2014 at 05:44:58PM +0200, stef...@seibold.net wrote:
Zitat von Benjamin Herrenschmidt <b...@au1.ibm.com>:
>I don't know about EHCI specifically but this is a known issue with
>XHCI, I observe similar issues on other powerpc platforms (servers)
>and this isn't architecture specific (looks more like actualy xhc
>implementation specific).
>
>Thadeu Cascardo (on CC) has been the one investigating that on our side,
>he might have more to add including patches.
>
I have now a kernel 3.14 dmesg log of the problem. After a kexec the
kexeced 3.14 kernel shows:
[ 1.170029] xhci_hcd 0001:03:00.0: xHCI Host Controller
[ 1.175306] xhci_hcd 0001:03:00.0: new USB bus registered,
assigned bus number 1
[ 1.212561] xhci_hcd 0001:03:00.0: Host not halted after 16000
microseconds.
[ 1.219621] xhci_hcd 0001:03:00.0: can't setup: -110
[ 1.224597] xhci_hcd 0001:03:00.0: USB bus 1 deregistered
[ 1.230021] xhci_hcd 0001:03:00.0: init 0001:03:00.0 fail, -110
[ 1.235955] xhci_hcd: probe of 0001:03:00.0 failed with error -110
What is your controller vendor and device IDs? Is that a TI chip?
Yes it is a TI chip, vendor ID 104c and product ID 8241.
Can you check if the patch I sent a month ago fixes it? [1] There's the
whole story there. In fact, you will also need something like the patch
below. Can you apply only the first one, verify, and, then, the other
one as well, and report what worked for you?
[1] http://marc.info/?l=linux-usb&m=139483181809062&w=2
I tried the attach patch and it did not help. This is what i expected
because this is a fix in the shutdown path, which will never called
when doing a forced kexec.
I have a running a 3.10.23 kernel. This kernel do a kexec for a kernel
3.14. Since the kernel 3.10.23 did not performe a clean shutdown, the
state of the XHCI Controller is undefined. So when kernel 3.14 will
probe XHCI it will find a XHCI controller which was not performed a
reset.
So i think it is necessary to reset the XHCI controller and all
devices on this bus. This is what i do with a "echo 1
>/sys/bus/pci/drivers/xhci_hcd/0001:03:00.0/reset" before the kexec.
- Stefani
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