linux-kernel - [PATCH 1/3] drm/imx: imx-ldb: honor 'native-mode' property when selecting video mode from DT

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Date:	Fri, 20 May 2016 15:34:52 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	David Airlie <airlied@...ux.ie>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Russell King - ARM Linux <linux@...linux.org.uk>,
	Sascha Hauer <kernel@...gutronix.de>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Cc:	Lothar Waßmann <LW@...O-electronics.de>
Subject: [PATCH 1/3] drm/imx: imx-ldb: honor 'native-mode' property when selecting video mode from DT

This patch allows to select a specific video mode from a list of modes
defined in DT by setting the 'native-mode' property appropriately.

This change does not affect the behaviour of existing platforms, since
they either:
   - have just one display-timings subnode
   - have the native-mode property pointing to the first entry
   - let the bootloader select the appropriate timing

Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
---
 drivers/gpu/drm/imx/imx-ldb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index a58eee5..b2dc4df 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -25,6 +25,7 @@
 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
 #include <linux/of_device.h>
 #include <linux/of_graph.h>
+#include <video/of_display_timing.h>
 #include <video/of_videomode.h>
 #include <linux/regmap.h>
 #include <linux/videodev2.h>
@@ -600,7 +601,8 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
 			channel->edid = kmemdup(edidp, channel->edid_len,
 						GFP_KERNEL);
 		} else if (!channel->panel) {
-			ret = of_get_drm_display_mode(child, &channel->mode, 0);
+			ret = of_get_drm_display_mode(child, &channel->mode,
+						OF_USE_NATIVE_MODE);
 			if (!ret)
 				channel->mode_valid = 1;
 		}
-- 
2.1.4