From: Chen-Yu Tsai <wens@csie.org>
Date: Fri, 21 Apr 2017 16:38:55 +0800
Subject: drm/sun4i: tcon: Copy ID from associated backend
Git-commit: d281c862de30381c144145a75ec1f0d5efc307ae
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The tcons and backends have a one-to-one relationship. Their IDs,
or indexes in the documentation, are also the same.

Copy the ID from the associated backend and save it in the tcon
structure. This will later be used when we add support for the
output data path muxes.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c |    1 +
 drivers/gpu/drm/sun4i/sun4i_tcon.h |    2 ++
 2 files changed, 3 insertions(+)

--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -471,6 +471,7 @@ static int sun4i_tcon_bind(struct device
 	dev_set_drvdata(dev, tcon);
 	tcon->drm = drm;
 	tcon->dev = dev;
+	tcon->id = backend->id;
 	tcon->quirks = of_device_get_match_data(dev);
 
 	tcon->lcd_rst = devm_reset_control_get(dev, "lcd");
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.h
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.h
@@ -174,6 +174,8 @@ struct sun4i_tcon {
 	/* Associated crtc */
 	struct sun4i_crtc		*crtc;
 
+	int				id;
+
 	/* TCON list management */
 	struct list_head		list;
 };