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

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Message-Id: <1257155873.5642.14.camel@utx.utx.cz>
Date:	Mon, 02 Nov 2009 10:57:53 +0100
From:	Stanislav Brabec <utx@...guin.cz>
To:	Haojian Zhuang <haojian.zhuang@...il.com>
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?

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.


________________________________________________________________________
Stanislav Brabec
http://www.penguin.cz/~utx

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