linux-kernel - Re: [PATCH v2 3/5] drm/bridge: ps8640: Return an error for incorrect attach flags

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Message-ID: <20200826174510.0207854f@a-VirtualBox>
Date:   Wed, 26 Aug 2020 17:45:10 +0500
From:   Bilal Wasim <bwasim.lkml@...il.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org,
        Collabora Kernel ML <kernel@...labora.com>,
        matthias.bgg@...il.com, drinkcat@...omium.org, hsinyi@...omium.org,
        laurent.pinchart@...asonboard.com, sam@...nborg.org,
        Andrzej Hajda <a.hajda@...sung.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>,
        Neil Armstrong <narmstrong@...libre.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 3/5] drm/bridge: ps8640: Return an error for
 incorrect attach flags

On Wed, 26 Aug 2020 10:15:24 +0200
Enric Balletbo i Serra <enric.balletbo@...labora.com> wrote:

> Bridge drivers that implement the new model only shall return an error
> from their attach() handler when the DRM_BRIDGE_ATTACH_NO_CONNECTOR
> flag is not set. So make sure we return an error because only the new
> drm_bridge model is supported.
> 
> Reviewed-by: Sam Ravnborg <sam@...nborg.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> 
> Changes in v2: None
> 
>  drivers/gpu/drm/bridge/parade-ps8640.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c
> b/drivers/gpu/drm/bridge/parade-ps8640.c index
> 13755d278db6..ce3e8b2da8c9 100644 ---
> a/drivers/gpu/drm/bridge/parade-ps8640.c +++
> b/drivers/gpu/drm/bridge/parade-ps8640.c @@ -200,6 +200,10 @@ static
> int ps8640_bridge_attach(struct drm_bridge *bridge, .channel = 0,
>  						   .node = NULL,
>  						 };
> +
> +	if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR))
> +		return -EINVAL;
> +
>  	/* port@0 is ps8640 dsi input port */
>  	in_ep = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
>  	if (!in_ep)

Reviewed-by: Bilal Wasim <bwasim.lkml@...il.com>
Tested-by: Bilal Wasim <bwasim.lkml@...il.com>

-Bilal