From: Benjamin Herrenschmidt <benh@au1.ibm.com>
To: Stefani Seibold <stefani@seibold.net>
Cc: 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,
Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Subject: Re: Missing USB XHCI and EHCI reset for kexec
Date: Mon, 14 Apr 2014 19:42:01 +1000 [thread overview]
Message-ID: <1397468521.9258.28.camel@pasglop> (raw)
In-Reply-To: <1397416959.1555.30.camel@vger.seibold.net>
On Sun, 2014-04-13 at 21:22 +0200, Stefani Seibold wrote:
> 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.
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.
Cheers,
Ben.
next prev parent reply other threads:[~2014-04-14 10:06 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-13 19:22 Missing USB XHCI and EHCI reset for kexec Stefani Seibold
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 [this message]
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
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