linux-kernel - Re: About the reboot hang issue with EHCI driver on the Baytrail platform

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Message-ID: <CA+eFSM1qokxsArUSOwSY8wd-VG_0JYT-pwRhu9-YgZkOccXkDg@mail.gmail.com>
Date:	Thu, 28 Aug 2014 01:07:16 +0800
From:	Gavin Guo <gavin.guo@...onical.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	linux-usb@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Anthony Wong <anthony.wong@...onical.com>,
	YK <yk@...onical.com>
Subject: Re: About the reboot hang issue with EHCI driver on the Baytrail platform

Hi Alan,

On Wed, Aug 27, 2014 at 10:38 PM, Alan Stern <stern@...land.harvard.edu> wrote:
> On Wed, 27 Aug 2014, Gavin Guo wrote:
>
>> > Still, why not use the BIOS setting to disable EHCI?
>>
>> It's hardware enablement policy. By default, we can't change the BIOS
>> setting to make the bug disappear until we find out the bug is due to
>> BIOS's bug. Add kernel parameters is the temporary solution for the
>> platform can ship. And if the bug is from kernel, we need to send
>> patches to upstream and pull back to Ubuntu kernel or send to Ubuntu
>> Kernel directly if it's a trivial solution like adding device id.
>> However, as you said, in this case about the bug the root may be from
>> BIOS code. So, we can coordinate with the OEM BIOS team to modify the
>> default BIOS setting.
>
> There is no doubt that the BIOS is buggy.  Your log contains this line:
>
> [    2.804205] pci 0000:00:1d.0: EHCI: BIOS handoff failed (BIOS bug?) 01010001
>
> The only way that can happen is if the BIOS isn't working right.
> However, this may be a different bug from the crashes you've been
> seeing.

Thanks for your comments. I really appreciate your support.

Gavin Guo

>
> Alan Stern
>
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