linux-kernel - Re: [RFT/PATCH] serial: omap: prevent resume if device is not suspended.

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Date:	Tue, 18 Sep 2012 22:57:08 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	Felipe Balbi <balbi@...com>, khilman@...com
cc:	Sourav Poddar <sourav.poddar@...com>, gregkh@...uxfoundation.org,
	alan@...ux.intel.com, tony@...mide.com, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, santosh.shilimkar@...com
Subject: Re: [RFT/PATCH] serial: omap: prevent resume if device is not
 suspended.

On Tue, 18 Sep 2012, Felipe Balbi wrote:

> On Tue, Sep 18, 2012 at 06:10:50PM +0530, Sourav Poddar wrote:
> > Greg's tty-next is not booting on 2420 based N800. The failure is
> > observed at serial init itself. The reason might be that n800 tries to
> > resume even though it is not suspended before.
> > 
> > Reported-by: Paul Walmsley <paul@...an.com>
> > Signed-off-by: Sourav Poddar <sourav.poddar@...com>
> 
> FWIW:
> 
> Reviewed-by: Felipe Balbi <balbi@...com>
> 
> Paul does this fix the issue for you ? Note that it depends on a
> previous patch Sourav sent [1]
> 
> [1] http://marc.info/?l=linux-omap&m=134796819607889&w=2

Yes, thanks - that fixes it,

Tested-by: Paul Walmsley <paul@...an.com>

> There's one thing that gets my attention, though, why only n800 would
> fail here ?
> 
> I wonder if we should be using:
> 
> pm_runtime_set_active(dev);
> pm_runtime_get_enable(dev);
> 
> to prevent our runtime_resume() to be called from probe, but Sourav
> tested and it doesn't work on BeagleBoard, but it works on PandaBoard.
> 
> Does it ring any bell ??

Nothing off the top of my head but haven't looked into it -- maybe this 
rings a bell with Kevin?


- Paul
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