linux-kernel - [PATCH 5.14 198/334] drm/bridge: ti-sn65dsi86: Avoid creating multiple connectors

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Date:   Mon, 13 Sep 2021 15:14:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        Rob Clark <robdclark@...omium.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Douglas Anderson <dianders@...omium.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 198/334] drm/bridge: ti-sn65dsi86: Avoid creating multiple connectors

From: Rob Clark <robdclark@...omium.org>

[ Upstream commit c7782443a88926a4f938f0193041616328cf2db2 ]

If we created our own connector because the driver does not support the
NO_CONNECTOR flag, we don't want the downstream bridge to *also* create
a connector.  And if this driver did pass the NO_CONNECTOR flag (and we
supported that mode) this would change nothing.

Fixes: 4e5763f03e10 ("drm/bridge: ti-sn65dsi86: Wrap panel with panel-bridge")
Reported-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Rob Clark <robdclark@...omium.org>
Tested-by: Stephen Boyd <swboyd@...omium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Reviewed-by: Douglas Anderson <dianders@...omium.org>
Tested-by: Douglas Anderson <dianders@...omium.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210811235253.924867-2-robdclark@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index c9cddf317c72..3aeed2731945 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -531,6 +531,9 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 	}
 	pdata->dsi = dsi;
 
+	/* We never want the next bridge to *also* create a connector: */
+	flags |= DRM_BRIDGE_ATTACH_NO_CONNECTOR;
+
 	/* Attach the next bridge */
 	ret = drm_bridge_attach(bridge->encoder, pdata->next_bridge,
 				&pdata->bridge, flags);
-- 
2.30.2