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

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Date:	Fri, 12 Oct 2012 17:42:02 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kevin Hilman <khilman@...prootsystems.com>
Cc:	Sourav <sourav.poddar@...com>, Paul Walmsley <paul@...an.com>,
	Felipe Balbi <balbi@...com>, gregkh@...uxfoundation.org,
	tony@...mide.com, linux-kernel@...r.kernel.org,
	santosh.shilimkar@...com, linux-serial@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	alan@...ux.intel.com
Subject: Re: [RFT/PATCH] serial: omap: prevent resume if device is not
	suspended.

On Fri, Oct 12, 2012 at 09:35:54AM -0700, Kevin Hilman wrote:
> Sourav <sourav.poddar@...com> writes:
> > diff --git a/drivers/tty/serial/omap-serial.c
> > b/drivers/tty/serial/omap-serial.c
> > index 6ede6fd..3fbc7f7 100644
> > --- a/drivers/tty/serial/omap-serial.c
> > +++ b/drivers/tty/serial/omap-serial.c
> > @@ -1414,6 +1414,7 @@ static int __devinit serial_omap_probe(struct
> > platform_device *pdev)
> >         INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
> >
> >         platform_set_drvdata(pdev, up);
> > +       pm_runtime_set_active(&pdev->dev);
> 
> NAK.
> 
> This will obviously break platforms where the UARTs are not active
> before driver loads.

I thought I had proposed a solution for this issue, which was this
sequence:

        omap_device_enable(dev);                                                
        pm_runtime_set_active(dev);                                             
        pm_runtime_enable(dev);                                                 

Yes, I can understand people not liking the omap_device_enable()
there, but I also notice that the email suggesting that never got a
reply either - not even a "I tried this and it doesn't work" or "it
does work".

As such, it seems this issue isn't making any progress as we had
already established that merely doing a "pm_runtime_set_active()"
before "pm_runtime_enable()" was going to break other platforms.
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