From: Maxime Ripard <maxime.ripard@free-electrons.com>
Date: Sat, 27 May 2017 18:09:28 +0200
Subject: drm/sun4i: tcon: Switch mux on only for composite
Git-commit: b7cb9b9143bc249d494020b55a57acef36d26682
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Even though that mux is undocumented, it seems like it needs to be set to 1
when using composite, and 0 when using HDMI.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-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 |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -112,16 +112,23 @@ EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
 void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
 			struct drm_encoder *encoder)
 {
+	u32 val;
+
 	if (!tcon->quirks->has_unknown_mux)
 		return;
 
 	if (channel != 1)
 		return;
 
+	if (encoder->encoder_type == DRM_MODE_ENCODER_TVDAC)
+		val = 1;
+	else
+		val = 0;
+
 	/*
 	 * FIXME: Undocumented bits
 	 */
-	regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, 1);
+	regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, val);
 }
 EXPORT_SYMBOL(sun4i_tcon_set_mux);