linux-kernel - Re: Possible suspend/resume regression in .32-rc?

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Message-ID: <771cded00911042106u39fd3655mae50a89bd419411b@mail.gmail.com>
Date:	Thu, 5 Nov 2009 00:06:13 -0500
From:	Haojian Zhuang <haojian.zhuang@...il.com>
To:	Stanislav Brabec <utx@...guin.cz>
Cc:	Pavel Machek <pavel@....cz>, dsaxena@...top.org,
	alan@...ux.intel.com, gregkh@...e.de,
	Daniel Mack <daniel@...aq.de>,
	linux-arm-kernel@...ts.infradead.org, Eric <eric.y.miao@...il.com>,
	Haojian Zhuang <haojian.zhuang@...vell.com>, rpurdie@...ys.net,
	lenz@...wisc.edu, kernel list <linux-kernel@...r.kernel.org>,
	Dirk@...er-online.de, arminlitzel@....de,
	Cyril Hrubis <metan@....cz>, thommycheck@...il.com,
	dbaryshkov@...il.com, omegamoon@...il.com,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Possible suspend/resume regression in .32-rc?

On Tue, Nov 3, 2009 at 4:50 AM, Stanislav Brabec <utx@...guin.cz> wrote:
> Haojian Zhuang wrote:
>> On Mon, Nov 2, 2009 at 5:57 AM, Stanislav Brabec <utx@...guin.cz> wrote:
>> > Haojian Zhuang wrote:
>> >
>> >> Commit b5b82df6, from May 2007, breaks no_console_suspend on the OLPC
>> >> XO laptop. Basically what happens is that upon returning from resume,
>> >> serial8250_resume_port() will reconfigure the port for high speed
>> >> mode and all console output will be garbled, making debug of the
>> >> resume path painful. This patch modifies uart_resume_port() to
>> >> reset the port to the state it was in before we suspended.
>> >
>> > See my patch waiting for approval in LKML thread
>> > "serial-core: resume serial hardware with no_console_suspend".
>> >
>> > It attempts to fix it, but I was not yet able to test it due to spitz
>> > resume breakage.
>> >
>>
>> Hi Stanislav,
>>
>> At first, your patch can't be applied into my latest codebase. I have
>> to update the patch. But the console resume is still blocked after
>> applied your patch. It works only after I merge some old code back. My
>> modified patch is in below.
>
> Yes, code changed there a bit. I sent rebased patch later in the thread.
> Did you try this one? (Well I did not test it yet - in time of sending
> resume did not work at all on my Zaurus.)
>
> Your patch is a bit different. I'll test both as soon as possible.
>
>

Your latest patch works well in my platform. Thanks a lot.
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