drm/sun4i: tcon: Move the muxing out of the mode set function

The muxing can actually happen on both channels on some SoCs, so it makes
more sense to just move it out of the sun4i_tcon1_mode_set function and
create a separate function that needs to be called by the encoders.

Let's do that and convert the existing drivers.
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>

drivers/gpu/drm/sun4i/sun4i_rgb.c

@@ -175,6 +175,7 @@ static void sun4i_rgb_encoder_mode_set(struct drm_encoder *encoder,
 	struct sun4i_tcon *tcon = rgb->tcon;
 
 	sun4i_tcon0_mode_set(tcon, mode);
+	sun4i_tcon_set_mux(tcon, 0, encoder);
 
 	/* FIXME: This seems to be board specific */
 	clk_set_phase(tcon->dclk, 120);

drivers/gpu/drm/sun4i/sun4i_tcon.c

@@ -109,6 +109,22 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable)
 }
 EXPORT_SYMBOL(sun4i_tcon_enable_vblank);
 
+void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
+			struct drm_encoder *encoder)
+{
+	if (!tcon->quirks->has_unknown_mux)
+		return;
+
+	if (channel != 1)
+		return;
+
+	/*
+	 * FIXME: Undocumented bits
+	 */
+	regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, 1);
+}
+EXPORT_SYMBOL(sun4i_tcon_set_mux);
+
 static int sun4i_tcon_get_clk_delay(struct drm_display_mode *mode,
 				    int channel)
 {
@@ -273,12 +289,6 @@ void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,
 	regmap_update_bits(tcon->regs, SUN4I_TCON_GCTL_REG,
 			   SUN4I_TCON_GCTL_IOMAP_MASK,
 			   SUN4I_TCON_GCTL_IOMAP_TCON1);
-
-	/*
-	 * FIXME: Undocumented bits
-	 */
-	if (tcon->quirks->has_unknown_mux)
-		regmap_write(tcon->regs, SUN4I_TCON_MUX_CTRL_REG, 1);
 }
 EXPORT_SYMBOL(sun4i_tcon1_mode_set);
 

drivers/gpu/drm/sun4i/sun4i_tcon.h

@@ -196,6 +196,8 @@ void sun4i_tcon_enable_vblank(struct sun4i_tcon *tcon, bool enable);
 /* Mode Related Controls */
 void sun4i_tcon_switch_interlace(struct sun4i_tcon *tcon,
 				 bool enable);
+void sun4i_tcon_set_mux(struct sun4i_tcon *tcon, int channel,
+			struct drm_encoder *encoder);
 void sun4i_tcon0_mode_set(struct sun4i_tcon *tcon,
 			  struct drm_display_mode *mode);
 void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon,

drivers/gpu/drm/sun4i/sun4i_tv.c

@@ -392,6 +392,7 @@ static void sun4i_tv_mode_set(struct drm_encoder *encoder,
 	const struct tv_mode *tv_mode = sun4i_tv_find_tv_by_mode(mode);
 
 	sun4i_tcon1_mode_set(tcon, mode);
+	sun4i_tcon_set_mux(tcon, 1, encoder);
 
 	/* Enable and map the DAC to the output */
 	regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,