[PATCH 1/3] drm/bridge: ps8640: Return an error for incorrect attach flags

From: Enric Balletbo i Serra <enric.balletbo@collabora.com>
To: linux-kernel@vger.kernel.org
Cc: Collabora Kernel ML <kernel@collabora.com>,
	matthias.bgg@gmail.com, drinkcat@chromium.org,
	hsinyi@chromium.org, laurent.pinchart@ideasonboard.com,
	sam@ravnborg.org, Andrzej Hajda <a.hajda@samsung.com>,
	Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
	Jernej Skrabec <jernej.skrabec@siol.net>,
	Jonas Karlman <jonas@kwiboo.se>,
	Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
	Neil Armstrong <narmstrong@baylibre.com>,
	dri-devel@lists.freedesktop.org
Subject: [PATCH 1/3] drm/bridge: ps8640: Return an error for incorrect attach flags
Date: Mon, 15 Jun 2020 22:53:18 +0200	[thread overview]
Message-ID: <20200615205320.790334-2-enric.balletbo@collabora.com> (raw)
In-Reply-To: <20200615205320.790334-1-enric.balletbo@collabora.com>

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.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---

 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 13755d278db6d..ce3e8b2da8c9b 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)
-- 
2.27.0

