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

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Date:   Tue, 7 Dec 2021 23:43:58 -0500
From:   Stephen Boyd <swboyd@...omium.org>
To:     Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, Maxime Ripard <maxime@...no.tech>,
        Douglas Anderson <dianders@...omium.org>,
        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

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);