linux-kernel - Re: [PATCH] drm/sun4i: Add missing frontend compatibles for A10, A13, A20 and A31

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Date:   Fri, 20 Apr 2018 09:33:36 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com, Chen-Yu Tsai <wens@...e.org>
Subject: Re: [PATCH] drm/sun4i: Add missing frontend compatibles for A10,
 A13, A20 and A31

Hi,

On Thu, 2018-04-19 at 17:07 +0200, Maxime Ripard wrote:
> On Thu, Apr 19, 2018 at 02:56:38PM +0200, Paul Kocialkowski wrote:
> > Although frontend nodes are defined in the device-trees of the
> > aforementioned platforms, there are no matching compatibles defined
> > in
> > the driver. This makes it impossible to probe the frontend on these
> > platforms.
> > 
> > Adding the appropriate compatibles to the driver fixes the issue.
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > ---
> >  drivers/gpu/drm/sun4i/sun4i_frontend.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > b/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > index 85f75046712c..c5a3de11817d 100644
> > --- a/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > +++ b/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > @@ -658,6 +658,10 @@ static const struct dev_pm_ops
> > sun4i_frontend_pm_ops = {
> >  };
> >  
> >  const struct of_device_id sun4i_frontend_of_table[] = {
> > +	{ .compatible = "allwinner,sun7i-a10-display-frontend" },
> > +	{ .compatible = "allwinner,sun7i-a13-display-frontend" },
> > +	{ .compatible = "allwinner,sun7i-a20-display-frontend" },
> > +	{ .compatible = "allwinner,sun7i-a31-display-frontend" },
> 
> Most of these compatibles are wrong, so it won't really work :)

Sorry for screwing up so bad...

> If you only tested it on the A20, just add it. We didn't add all of
> them because there's some slight variations between the generations
> that are not yet taken into account.

That makes sense. I will thus send v2 with A20 only and send follow-up
patches for other platforms when tested and properly working.

Thanks!

-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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