[PATCH 5.19 0313/1157] drm/bridge: tc358767: Handle dsi_lanes == 0 as invalid

[Greg Kroah-Hartman]

From: Marek Vasut <marex@xxxxxxx>

[ Upstream commit 0d662350928e6787d29ab205e47e5aa6f1f792f9 ]

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

Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Fixes: bbfd3190b6562 ("drm/bridge: tc358767: Add DSI-to-DPI mode support")
Signed-off-by: Marek Vasut <marex@xxxxxxx>
Cc: Jonas Karlman <jonas@xxxxxxxxx>
Cc: Laurent Pinchart <Laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Cc: Marek Vasut <marex@xxxxxxx>
Cc: Maxime Ripard <maxime@xxxxxxxxxx>
Cc: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
Cc: Robert Foss <robert.foss@xxxxxxxxxx>
Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20220519095137.11896-1-marex@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/bridge/tc358767.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 485717c8f0b4..466b8fc9836a 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1871,7 +1871,7 @@ static int tc_mipi_dsi_host_attach(struct tc_data *tc)
 	of_node_put(host_node);
 	of_node_put(endpoint);
 
-	if (dsi_lanes < 0 || dsi_lanes > 4)
+	if (dsi_lanes <= 0 || dsi_lanes > 4)
 		return -EINVAL;
 
 	if (!host)
-- 
2.35.1