linux-kernel - Re: [PATCH] drm/bridge: parade-ps8640: Add backpointer to drm_device in drm_dp

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Date:   Tue, 7 Dec 2021 08:13:35 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Philip Chen <philipchen@...omium.org>
Cc:     dri-devel@...ts.freedesktop.org, Lyude Paul <lyude@...hat.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/bridge: parade-ps8640: Add backpointer to drm_device
 in drm_dp_aux

Hi,

On Mon, Dec 6, 2021 at 5:44 PM Philip Chen <philipchen@...omium.org> wrote:
>
> Hi
>
> On Mon, Dec 6, 2021 at 4:29 PM Douglas Anderson <dianders@...omium.org> wrote:
> >
> > When we added the support for the AUX channel in commit 13afcdd7277e
> > ("drm/bridge: parade-ps8640: Add support for AUX channel") we forgot
> > to set "drm_dev" to avoid the warning splat at the beginning of
> > drm_dp_aux_register(). Since everything was working I guess I never
> > noticed the splat when testing against mainline. In any case, it's
> > easy to fix. This is basically just like commit 6cba3fe43341 ("drm/dp:
> > Add backpointer to drm_device in drm_dp_aux") but just for the
> > parade-ps8640.
> >
> > Fixes: 13afcdd7277e ("drm/bridge: parade-ps8640: Add support for AUX channel")
> > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > ---
> >
> >  drivers/gpu/drm/bridge/parade-ps8640.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> > index 26898042ba3d..818704bf5e86 100644
> > --- a/drivers/gpu/drm/bridge/parade-ps8640.c
> > +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> > @@ -449,6 +449,7 @@ static int ps8640_bridge_attach(struct drm_bridge *bridge,
> >         if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
> >                 return -EINVAL;
> >
> > +       ps_bridge->aux.drm_dev = bridge->dev;
> >         ret = drm_dp_aux_register(&ps_bridge->aux);
> >         if (ret) {
> >                 dev_err(dev, "failed to register DP AUX channel: %d\n", ret);
> > --
> > 2.34.1.400.ga245620fadb-goog
> >
>
> Signed-off-by: Philip Chen <philipchen@...omium.org>

That's probably not quite the right tag. I'm going to assume you meant
Reviewed-by? Usually Signed-off-by is added if you were one of the
authors of the patch or you were a maintainer that "touched" the patch
on its way to landing upstream...

-Doug