[PATCH v4 03/11] drm/sun4i: tcon: Switch mux on only for composite

[Maxime Ripard]

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.rip...@free-electrons.com>
Acked-by: Chen-Yu Tsai <w...@csie.org>
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c |  9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c 
b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index 36e25f417dc3..28da61ac9bab 100644
--- 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);
 
-- 
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