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

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Message-ID: <20100113114651.GJ8970@buzzloop.caiaq.de>
Date:	Wed, 13 Jan 2010 12:46:51 +0100
From:	Daniel Mack <daniel@...aq.de>
To:	Haojian Zhuang <haojian.zhuang@...il.com>
Cc:	Stanislav Brabec <utx@...guin.cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Eric <eric.y.miao@...il.com>,
	Pavel Machek <pavel@....cz>, dbaryshkov@...il.com,
	Cyril Hrubis <metan@....cz>, arminlitzel@....de,
	gregkh@...e.de, Haojian Zhuang <haojian.zhuang@...vell.com>,
	kernel list <linux-kernel@...r.kernel.org>, dsaxena@...top.org,
	lenz@...wisc.edu, rpurdie@...ys.net, omegamoon@...il.com,
	thommycheck@...il.com, Dirk@...er-online.de,
	linux-arm-kernel@...ts.infradead.org, alan@...ux.intel.com
Subject: Re: Possible suspend/resume regression in .32-rc?

On Thu, Nov 05, 2009 at 12:06:13AM -0500, Haojian Zhuang wrote:
> 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.

It seems Stanislav's patch is still unmerged in the current git HEAD.
Any idea why it is held back? I have it applied locally since quite a
while here, and it works well. So if it helps, take my Tested-by: for
it.

Daniel

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