linux-kernel - Re: [PATCH v4 00/21] OMAP UART Patches

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Date:	Sun, 16 Sep 2012 01:22:01 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Felipe Balbi <balbi@...com>,
	Shubhrajyoti Datta <shubhrajyoti@...com>
cc:	Greg KH <gregkh@...uxfoundation.org>, alan@...ux.intel.com,
	Tony Lindgren <tony@...mide.com>,
	Kevin Hilman <khilman@...com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Sourav Poddar <sourav.poddar@...com>
Subject: Re: [PATCH v4 00/21] OMAP UART Patches

On Wed, 12 Sep 2012, Felipe Balbi wrote:

> On Tue, Sep 11, 2012 at 10:02:48PM +0000, Paul Walmsley wrote:
> 
> > The bad news is that N800 no longer boots -- or the UART dies during 
> > serial init:
> > 
> > http://www.pwsan.com/omap/testlogs/test_tty_next_e36851d0/20120910020323/boot/2420n800/2420n800_log.txt
> > 
> > The problem doesn't seem to affect the 2430SDP.
> > 
> > Could you put together a patch to fix N800?

Bisected this down.  It's this one that causes the problem on N800:

commit 93220dcc3052182e7156c09655ad1316055564b9
Author: Felipe Balbi <balbi@...com>
Date:   Thu Sep 6 15:45:27 2012 +0300

    serial: omap: set dev->drvdata before enabling pm_runtime
    
    by the time we call our first pm_runtme_get_sync()
    after enable pm_runtime, our resume method might
    be called. To avoid problems, we must make sure
    that our dev->drvdata is set correctly before
    our resume method gets called.
    
    Tested-by: Shubhrajyoti D <shubhrajyoti@...com>
    Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
    Signed-off-by: Felipe Balbi <balbi@...com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

- Paul
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