linux-kernel - Re: [PATCH 28/30] drm/sti: sti_vdo: Use drm_bridge

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Date:   Wed, 27 Nov 2019 11:02:25 +0000
From:   Mihail Atanassov <Mihail.Atanassov@....com>
To:     Sam Ravnborg <sam@...nborg.org>
CC:     nd <nd@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        David Airlie <airlied@...ux.ie>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>, Vincent Abriou <vincent.abriou@...com>
Subject: Re: [PATCH 28/30] drm/sti: sti_vdo: Use drm_bridge_init()

On Tuesday, 26 November 2019 19:37:40 GMT Sam Ravnborg wrote:
> Hi Mihail.

Hi Sam,

> 
> On Tue, Nov 26, 2019 at 01:16:26PM +0000, Mihail Atanassov wrote:
> > No functional change.
> > 
> > Signed-off-by: Mihail Atanassov <mihail.atanassov@....com>
> > ---
> >  drivers/gpu/drm/sti/sti_dvo.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/sti/sti_dvo.c b/drivers/gpu/drm/sti/sti_dvo.c
> > index 68289b0b063a..20a3956b33bc 100644
> > --- a/drivers/gpu/drm/sti/sti_dvo.c
> > +++ b/drivers/gpu/drm/sti/sti_dvo.c
> > @@ -462,9 +462,7 @@ static int sti_dvo_bind(struct device *dev, struct device *master, void *data)
> >  	if (!bridge)
> >  		return -ENOMEM;
> >  
> > -	bridge->driver_private = dvo;
> > -	bridge->funcs = &sti_dvo_bridge_funcs;
> > -	bridge->of_node = dvo->dev.of_node;
> > +	drm_bridge_init(bridge, &dvo->dev, &sti_dvo_bridge_funcs, NULL, dvo);
> >  	drm_bridge_add(bridge);
> >  
> >  	err = drm_bridge_attach(encoder, bridge, NULL);
> 
> I can see from grepping that bridge.driver_private is used
> in a couple of other files in sti/
> 
> Like sti_hdmi.c:
>         bridge->driver_private = hdmi;
>         bridge->funcs = &sti_hdmi_bridge_funcs;
>         drm_bridge_attach(encoder, bridge, NULL);
> 
> 
> I wonder if a drm_bridge_init() should be added there.
> I did not look closely - but it looked suspisiously.

My goal with drm_bridge_init() was to get devlinks sorted out for
cross-module uses of a drm_bridge (via of_drm_find_bridge()), so I only
considered locations where drm_bridge_add/remove() were used.

Would you be okay with a promise to push a cleanup of this one and the
one in sti_hda.c after patch 1/30 lands in some form? I'd rather not
make this series much longer, it's already pushing it at 30 :).

> 
> 	Sam
> 


-- 
Mihail