linux-kernel - [PATCH 5.2 059/124] drm/omap: Fix port lookup for SDI output

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Date:   Fri, 20 Sep 2019 00:02:27 +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,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Aaro Koskinen <aaro.koskinen@....fi>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.2 059/124] drm/omap: Fix port lookup for SDI output

From: Laurent Pinchart <laurent.pinchart@...asonboard.com>

[ Upstream commit 8090f7eb318d4241625449252db2741e7703e027 ]

When refactoring port lookup for DSS outputs, commit d17eb4537a7e
("drm/omap: Factor out common init/cleanup code for output devices")
incorrectly hardcoded usage of DT port 0. This breaks operation for SDI
(which uses the DT port 1) and DPI outputs other than DPI0 (which are
not used in mainline DT sources).

Fix this by using the port number from the output omap_dss_device
of_ports field.

Fixes: d17eb4537a7e ("drm/omap: Factor out common init/cleanup code for output devices")
Signed-off-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190821183226.13784-1-laurent.pinchart@ideasonboard.com
Tested-by: Aaro Koskinen <aaro.koskinen@....fi>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/omapdrm/dss/output.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/output.c b/drivers/gpu/drm/omapdrm/dss/output.c
index de0f882f0f7b0..14b41de44ebcd 100644
--- a/drivers/gpu/drm/omapdrm/dss/output.c
+++ b/drivers/gpu/drm/omapdrm/dss/output.c
@@ -4,6 +4,7 @@
  * Author: Archit Taneja <archit@...com>
  */
 
+#include <linux/bitops.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
@@ -20,7 +21,8 @@ int omapdss_device_init_output(struct omap_dss_device *out)
 {
 	struct device_node *remote_node;
 
-	remote_node = of_graph_get_remote_node(out->dev->of_node, 0, 0);
+	remote_node = of_graph_get_remote_node(out->dev->of_node,
+					       ffs(out->of_ports) - 1, 0);
 	if (!remote_node) {
 		dev_dbg(out->dev, "failed to find video sink\n");
 		return 0;
-- 
2.20.1