[PATCH 2/2] drm/imx: ldb: fix lvds<->di channel mapping on mx53

[Philipp Zabel]

From: Lucas Stach <l.stach at pengutronix.de>

On systems without a mux between the IPU display interfaces
and the LVDS channels it isn't possible to infer the DI
number from the LDB port numbers, but have a static 1:1
mapping.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
 drivers/gpu/drm/imx/imx-ldb.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 631909e..4fca2b9 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -131,6 +131,19 @@ static bool imx_ldb_encoder_mode_fixup(struct drm_encoder *encoder,
 	return true;
 }
 
+static int imx_ldb_get_mux_id(struct imx_ldb_channel *channel)
+{
+	/*
+	 * If there is no mux in between the mapping from lvds channel number
+	 * to display interface number is 1:1
+	 */
+	if (channel->ldb->lvds_mux)
+		return imx_drm_encoder_get_mux_id(channel->child,
+						  &channel->encoder);
+	else
+		return channel->chno;
+}
+
 static void imx_ldb_set_clock(struct imx_ldb *ldb, int mux, int chno,
 		unsigned long serial_clk, unsigned long di_clk)
 {
@@ -195,7 +208,7 @@ static void imx_ldb_encoder_commit(struct drm_encoder *encoder)
 	struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
 	struct imx_ldb *ldb = imx_ldb_ch->ldb;
 	int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
-	int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
+	int mux = imx_ldb_get_mux_id(imx_ldb_ch);
 
 	if (dual) {
 		clk_prepare_enable(ldb->clk[0]);
@@ -241,7 +254,7 @@ static void imx_ldb_encoder_mode_set(struct drm_encoder *encoder,
 	int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
 	unsigned long serial_clk;
 	unsigned long di_clk = mode->clock * 1000;
-	int mux = imx_drm_encoder_get_mux_id(imx_ldb_ch->child, encoder);
+	int mux = imx_ldb_get_mux_id(imx_ldb_ch);
 
 	if (mode->clock > 170000) {
 		dev_warn(ldb->dev,
-- 
2.1.4