linux-kernel - Re: [PATCHv2] pinctrl: baytrail: Clear DIRECT

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Message-ID: <20140918095505.GI10854@lahna.fi.intel.com>
Date:	Thu, 18 Sep 2014 12:55:05 +0300
From:	Mika Westerberg <mika.westerberg@...el.com>
To:	Samuel Ortiz <samuel.ortiz@...el.com>
Cc:	Loic Poulain <loic.poulain@...el.com>, linus.walleij@...aro.org,
	heikki.krogerus@...ux.intel.com, mathias.nyman@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	Eric Ernst <eric.ernst@...ux.intel.com>
Subject: Re: [PATCHv2] pinctrl: baytrail: Clear DIRECT_IRQ bit

On Thu, Sep 18, 2014 at 11:41:13AM +0200, Samuel Ortiz wrote:
> Hi Mika,
> 
> On Thu, Sep 18, 2014 at 10:49:43AM +0300, Mika Westerberg wrote:
> > On Wed, Sep 17, 2014 at 03:47:01PM +0200, Loic Poulain wrote:
> > > Direct Irq En bit can be initialized to a bad value.
> > > This bit has to be cleared for io access mode.
> > 
> > +Eric
> > 
> > I would like to have a bit better explanation *why* this bit needs to be
> > cleared.
> > 
> > Also want to ask Eric (who added the WARN()), is there something
> > preventing us to do this? I remember last time you said that we are not
> > supposed to change this bit runtime.
> > 
> > My preference is that we get rid of the WARN() and just unconditionally
> > clear the bit.
> I'd keep the warn though, as it most likely shows a buggy firmware
> implementation.

Fair enough :)

Maybe it could be more informative.
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