From e2d8455e5c53f4d97284693650b87b2942a5b312 Mon Sep 17 00:00:00 2001
From: Neil Armstrong <narmstrong@baylibre.com>
Date: Thu, 6 Apr 2017 11:34:04 +0200
Subject: [PATCH 245/286] drm: bridge: dw-hdmi: fix input format/encoding from
 plat_data

The plat_data->input_bus_format and plat_data->input_bus_encoding
are unsigned long and are always >=0, but the value 0 was still
considered as RGB888 for input_bus_format and default color space
for input_bus_encoding in the reworked code.

This patch changes the if statement check for a non-zero value to
either use the default input bus_format and/or bus_encoding for a zero
value and the provided bus_format and/or bus_encoding for a
non zero value.

Thanks to Dan Carpenter for his bug report at [1].

Tested on Amlogic P230 (with CSC enabled for YUV444 to RGB) and Rockchip
RK3288 ACT8846 EVB Board (no CSC involved, direct RGB passthrough).

[1] http://lkml.kernel.org/r/20170406052120.GA26578@mwanda

Cc: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: def23aa7e982 ("drm: bridge: dw-hdmi: Switch to V4L bus format and encodings")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
[narmstrong@baylibre.com: reworded commit message and added Fixes tag]
Link: http://patchwork.freedesktop.org/patch/msgid/1491471244-24989-1-git-send-email-narmstrong@baylibre.com

(cherry picked from commit e20c29aa722a90f3b8092b340362eabe488dbfc4)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
---
 drivers/gpu/drm/bridge/synopsys/dw-hdmi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -1654,14 +1654,14 @@ static int dw_hdmi_setup(struct dw_hdmi
 	hdmi->hdmi_data.video_mode.mpixelrepetitioninput = 0;
 
 	/* TOFIX: Get input format from plat data or fallback to RGB888 */
-	if (hdmi->plat_data->input_bus_format >= 0)
+	if (hdmi->plat_data->input_bus_format)
 		hdmi->hdmi_data.enc_in_bus_format =
 			hdmi->plat_data->input_bus_format;
 	else
 		hdmi->hdmi_data.enc_in_bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 
 	/* TOFIX: Get input encoding from plat data or fallback to none */
-	if (hdmi->plat_data->input_bus_encoding >= 0)
+	if (hdmi->plat_data->input_bus_encoding)
 		hdmi->hdmi_data.enc_in_encoding =
 			hdmi->plat_data->input_bus_encoding;
 	else