linux-kernel - Re: [PATCH v3] drm/bridge: sn65dsi86: defer if there is no dsi host

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Message-ID: <CAD=FV=Xg+C4U0NHC6D4HMDZ1uVVstHWdV7onHwxtTvB6yh=Ciw@mail.gmail.com>
Date:   Wed, 8 Dec 2021 08:53:36 -0800
From:   Doug Anderson <dianders@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, Maxime Ripard <maxime@...no.tech>,
        Jernej Škrabec <jernej.skrabec@...il.com>,
        Rob Clark <robdclark@...omium.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] drm/bridge: sn65dsi86: defer if there is no dsi host

Hi,

On Tue, Dec 7, 2021 at 8:44 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> Quoting Rob Clark (2021-12-07 13:57:52)
> > From: Rob Clark <robdclark@...omium.org>
> >
> > Otherwise we don't get another shot at it if the bridge probes before
> > the dsi host is registered.  It seems like this is what *most* (but not
> > all) of the other bridges do.
> >
> > It looks like this was missed in the conversion to attach dsi host at
> > probe time.
> >
> > Fixes: c3b75d4734cb ("drm/bridge: sn65dsi86: Register and attach our DSI device at probe")
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > Reviewed-by: Doug Anderson <dianders@...omium.org>
> > ---
>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
>
> One more nit below
>
> > v2: Drop DRM_ERROR() in favor of drm_err_probe() and shift around the
> >     spot where we report the error
> > v3: Add \n and cull error msgs a bit further
> >
> >  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 18 +++++++-----------
> >  1 file changed, 7 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > index 02b490671f8f..c2928a6409b1 100644
> > --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
> > @@ -740,10 +736,8 @@ static int ti_sn_attach_host(struct ti_sn65dsi86 *pdata)
> >         pdata->dsi = dsi;
> >
> >         ret = devm_mipi_dsi_attach(dev, dsi);
> > -       if (ret < 0) {
> > -               DRM_ERROR("failed to attach dsi to host\n");
> > +       if (ret < 0)
> >                 return ret;
> > -       }
> >
> >         return 0;
>
> This can be simplified further to
>
>         return devm_mipi_dsi_attach(dev, dsi);

Squahsed in Stephen's fix and pushed. Had to also remove "ret" which
was no longer used in this function after Stephen's change.

03848335b5b1 drm/bridge: sn65dsi86: defer if there is no dsi host

-Doug