From: Stefani Seibold <stefani@seibold.net>
To: linux-usb <linux-usb@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Greg KH <greg@kroah.com>, Alan Stern <stern@rowland.harvard.edu>,
sarah.a.sharp@linux.intel.com
Subject: Missing USB XHCI and EHCI reset for kexec
Date: Sun, 13 Apr 2014 21:22:39 +0200 [thread overview]
Message-ID: <1397416959.1555.30.camel@vger.seibold.net> (raw)
When executing a kexec kernel on a PowerPC board the new started kernel
will not find already enumerated USB devices due a missing reset on the
USB bus.
As a work around a
echo 1 >/sys/bus/pci/drivers/[ex]hci-pci/BUS-ADDRESS-OF-THE-HCD/reset
will solve this. But this is far from beauty.
My latest kernel without this issue was for EHCI kernel 2.6.39 and for
XHCI kernel 3.4, but i have no idea when exactly this behavior was
introduced.
For X86 all is fine.
next reply other threads:[~2014-04-13 19:23 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-13 19:22 Stefani Seibold [this message]
2014-04-14 2:14 ` Alan Stern
2014-04-14 13:54 ` stefani
2014-04-14 14:49 ` Alan Stern
2014-04-14 15:25 ` stefani
2014-04-14 16:27 ` Alan Stern
2014-04-14 16:35 ` Stefani Seibold
2014-04-14 17:58 ` Alan Stern
2014-04-15 18:32 ` Stefani Seibold
2014-04-15 19:05 ` Alan Stern
2014-04-15 19:08 ` Stefani Seibold
2014-04-15 18:30 ` Stefani Seibold
2014-04-15 19:02 ` Alan Stern
2014-04-15 19:06 ` Stefani Seibold
2014-04-15 19:14 ` Alan Stern
2014-04-15 19:17 ` Stefani Seibold
2014-04-15 19:14 ` Stefani Seibold
2014-04-15 19:34 ` Alan Stern
2014-04-14 9:42 ` Benjamin Herrenschmidt
2014-04-14 15:44 ` stefani
2014-04-14 21:48 ` Thadeu Lima de Souza Cascardo
2014-04-15 10:04 ` stefani
2014-04-15 12:20 ` Thadeu Lima de Souza Cascardo
2014-04-15 15:00 ` stefani
2014-04-15 18:33 ` Thadeu Lima de Souza Cascardo
2014-04-15 18:42 ` Stefani Seibold
2014-04-15 18:49 ` Thadeu Lima de Souza Cascardo
2014-04-15 18:54 ` Stefani Seibold
2014-06-07 8:15 ` Benjamin Herrenschmidt
2014-06-07 15:40 ` Alan Stern
2014-06-07 21:11 ` Benjamin Herrenschmidt
2014-06-07 22:35 ` Benjamin Herrenschmidt
2014-06-08 1:09 ` Alan Stern
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1397416959.1555.30.camel@vger.seibold.net \
--to=stefani@seibold.net \
--cc=greg@kroah.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=sarah.a.sharp@linux.intel.com \
--cc=stern@rowland.harvard.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
Powered by JetHome