From 5752b718657a99936d714d2caab0236b08e5f4ca Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Thu, 19 May 2022 01:38:44 +0200
Subject: drm/bridge: ti-sn65dsi83: Handle dsi_lanes == 0 as invalid
Git-commit: edbc7960bef7fd71ef1e44d0df15b864784b14c8
Patch-mainline: v5.19-rc2
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
Alt-commit: 2ba5b683260e13d8f2c43bc594d5ae15ec7f7a04

Handle empty data-lanes = < >; property, which translates to
dsi_lanes = 0 as invalid.

Fixes: ceb515ba29ba6 ("drm/bridge: ti-sn65dsi83: Add TI SN65DSI83 and SN65DSI84 driver")
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Marek Vasut <marex@denx.de>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20220518233844.248504-1-marex@denx.de
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi83.c b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
index 2831f0813c3a..ac66f408b40c 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi83.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi83.c
@@ -577,7 +577,7 @@ static int sn65dsi83_parse_dt(struct sn65dsi83 *ctx, enum sn65dsi83_model model)
 	ctx->host_node = of_graph_get_remote_port_parent(endpoint);
 	of_node_put(endpoint);
 
-	if (ctx->dsi_lanes < 0 || ctx->dsi_lanes > 4) {
+	if (ctx->dsi_lanes <= 0 || ctx->dsi_lanes > 4) {
 		ret = -EINVAL;
 		goto err_put_node;
 	}
-- 
2.38.1