Re: [PATCH RFC 07/19] drm/msm: Use drm_attach_bridge() to attach a bridge to an encoder

From: Sam Ravnborg <sam@ravnborg.org>
To: Boris Brezillon <boris.brezillon@collabora.com>,
	Sean Paul <sean@poorly.run>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>,
	Jonas Karlman <jonas@kwiboo.se>,
	Neil Armstrong <narmstrong@baylibre.com>,
	Seung-Woo Kim <sw0312.kim@samsung.com>,
	dri-devel@lists.freedesktop.org,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	kernel@collabora.com, Chris Healy <Chris.Healy@zii.aero>
Subject: Re: [PATCH RFC 07/19] drm/msm: Use drm_attach_bridge() to attach a bridge to an encoder
Date: Mon, 19 Aug 2019 19:19:39 +0200	[thread overview]
Message-ID: <20190819171939.GB27109@ravnborg.org> (raw)
In-Reply-To: <20190808151150.16336-8-boris.brezillon@collabora.com>

On Thu, Aug 08, 2019 at 05:11:38PM +0200, Boris Brezillon wrote:
> This is part of our attempt to make the bridge chain a double-linked
> list based on the generic list helpers. In order to do that, we must
> patch all drivers manipulating the encoder->bridge field directly.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

Sean, this patch looks like a nice cleanup we can apply
outside the series.
It would be good that drivers do not poke direct in
the encoder data that this patch fixes.

	Sam

> ---
>  drivers/gpu/drm/msm/edp/edp.c   | 4 +++-
>  drivers/gpu/drm/msm/hdmi/hdmi.c | 4 +++-
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/edp/edp.c b/drivers/gpu/drm/msm/edp/edp.c
> index 0f312ac5b624..ad4e963ccd9b 100644
> --- a/drivers/gpu/drm/msm/edp/edp.c
> +++ b/drivers/gpu/drm/msm/edp/edp.c
> @@ -178,7 +178,9 @@ int msm_edp_modeset_init(struct msm_edp *edp, struct drm_device *dev,
>  		goto fail;
>  	}
>  
> -	encoder->bridge = edp->bridge;
> +	ret = drm_bridge_attach(encoder, edp->bridge, NULL);
> +	if (ret)
> +		goto fail;
>  
>  	priv->bridges[priv->num_bridges++]       = edp->bridge;
>  	priv->connectors[priv->num_connectors++] = edp->connector;
> diff --git a/drivers/gpu/drm/msm/hdmi/hdmi.c b/drivers/gpu/drm/msm/hdmi/hdmi.c
> index 0e4217be3f00..55b9a8c8312b 100644
> --- a/drivers/gpu/drm/msm/hdmi/hdmi.c
> +++ b/drivers/gpu/drm/msm/hdmi/hdmi.c
> @@ -327,7 +327,9 @@ int msm_hdmi_modeset_init(struct hdmi *hdmi,
>  		goto fail;
>  	}
>  
> -	encoder->bridge = hdmi->bridge;
> +	ret = drm_bridge_attach(encoder, hdmi->bridge, NULL);
> +	if (ret)
> +		goto fail;
>  
>  	priv->bridges[priv->num_bridges++]       = hdmi->bridge;
>  	priv->connectors[priv->num_connectors++] = hdmi->connector;
> -- 
> 2.21.0
> 
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