[PATCH v2 11/30] drm/sun4i: de2/de3: Simplify CSC config interface

[Jernej Skrabec <jernej.skrabec@gmail.com>]

Merging both function into one lets this one decide on it's own if CSC
should be enabled or not. Currently heuristics for that is pretty simple
- enable it for YUV formats and disable for RGB. DE3 and newer allows
YUV pipeline, which will be easier to implement these way.

Reviewed-by: Chen-Yu Tsai <wens@kernel.org>
Tested-by: Ryan Walklin <ryan@testtoast.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 drivers/gpu/drm/sun4i/sun8i_csc.c      | 89 ++++++++++----------------
 drivers/gpu/drm/sun4i/sun8i_csc.h      |  9 ++-
 drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 11 +---
 3 files changed, 40 insertions(+), 69 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_csc.c b/drivers/gpu/drm/sun4i/sun8i_csc.c
index c100d29b1a89..cf0c5121661b 100644
--- a/drivers/gpu/drm/sun4i/sun8i_csc.c
+++ b/drivers/gpu/drm/sun4i/sun8i_csc.c
@@ -107,23 +107,28 @@ static const u32 yuv2rgb_de3[2][3][12] = {
 	},
 };
 
-static void sun8i_csc_set_coefficients(struct regmap *map, u32 base,
-				       enum sun8i_csc_mode mode,
-				       enum drm_color_encoding encoding,
-				       enum drm_color_range range)
+static void sun8i_csc_setup(struct regmap *map, u32 base,
+			    enum sun8i_csc_mode mode,
+			    enum drm_color_encoding encoding,
+			    enum drm_color_range range)
 {
+	u32 base_reg, val;
 	const u32 *table;
-	u32 base_reg;
 	int i;
 
 	table = yuv2rgb[range][encoding];
 
 	switch (mode) {
+	case SUN8I_CSC_MODE_OFF:
+		val = 0;
+		break;
 	case SUN8I_CSC_MODE_YUV2RGB:
+		val = SUN8I_CSC_CTRL_EN;
 		base_reg = SUN8I_CSC_COEFF(base, 0);
 		regmap_bulk_write(map, base_reg, table, 12);
 		break;
 	case SUN8I_CSC_MODE_YVU2RGB:
+		val = SUN8I_CSC_CTRL_EN;
 		for (i = 0; i < 12; i++) {
 			if ((i & 3) == 1)
 				base_reg = SUN8I_CSC_COEFF(base, i + 1);
@@ -135,28 +140,37 @@ static void sun8i_csc_set_coefficients(struct regmap *map, u32 base,
 		}
 		break;
 	default:
+		val = 0;
 		DRM_WARN("Wrong CSC mode specified.\n");
 		return;
 	}
+
+	regmap_write(map, SUN8I_CSC_CTRL(base), val);
 }
 
-static void sun8i_de3_ccsc_set_coefficients(struct regmap *map, int layer,
-					    enum sun8i_csc_mode mode,
-					    enum drm_color_encoding encoding,
-					    enum drm_color_range range)
+static void sun8i_de3_ccsc_setup(struct regmap *map, int layer,
+				 enum sun8i_csc_mode mode,
+				 enum drm_color_encoding encoding,
+				 enum drm_color_range range)
 {
+	u32 addr, val, mask;
 	const u32 *table;
-	u32 addr;
 	int i;
 
+	mask = SUN50I_MIXER_BLEND_CSC_CTL_EN(layer);
 	table = yuv2rgb_de3[range][encoding];
 
 	switch (mode) {
+	case SUN8I_CSC_MODE_OFF:
+		val = 0;
+		break;
 	case SUN8I_CSC_MODE_YUV2RGB:
+		val = mask;
 		addr = SUN50I_MIXER_BLEND_CSC_COEFF(DE3_BLD_BASE, layer, 0);
 		regmap_bulk_write(map, addr, table, 12);
 		break;
 	case SUN8I_CSC_MODE_YVU2RGB:
+		val = mask;
 		for (i = 0; i < 12; i++) {
 			if ((i & 3) == 1)
 				addr = SUN50I_MIXER_BLEND_CSC_COEFF(DE3_BLD_BASE,
@@ -173,67 +187,30 @@ static void sun8i_de3_ccsc_set_coefficients(struct regmap *map, int layer,
 		}
 		break;
 	default:
+		val = 0;
 		DRM_WARN("Wrong CSC mode specified.\n");
 		return;
 	}
-}
-
-static void sun8i_csc_enable(struct regmap *map, u32 base, bool enable)
-{
-	u32 val;
-
-	if (enable)
-		val = SUN8I_CSC_CTRL_EN;
-	else
-		val = 0;
-
-	regmap_update_bits(map, SUN8I_CSC_CTRL(base), SUN8I_CSC_CTRL_EN, val);
-}
-
-static void sun8i_de3_ccsc_enable(struct regmap *map, int layer, bool enable)
-{
-	u32 val, mask;
-
-	mask = SUN50I_MIXER_BLEND_CSC_CTL_EN(layer);
-
-	if (enable)
-		val = mask;
-	else
-		val = 0;
 
 	regmap_update_bits(map, SUN50I_MIXER_BLEND_CSC_CTL(DE3_BLD_BASE),
 			   mask, val);
 }
 
-void sun8i_csc_set_ccsc_coefficients(struct sun8i_mixer *mixer, int layer,
-				     enum sun8i_csc_mode mode,
-				     enum drm_color_encoding encoding,
-				     enum drm_color_range range)
+void sun8i_csc_config(struct sun8i_mixer *mixer, int layer,
+		      enum sun8i_csc_mode mode,
+		      enum drm_color_encoding encoding,
+		      enum drm_color_range range)
 {
 	u32 base;
 
 	if (mixer->cfg->de_type == SUN8I_MIXER_DE3) {
-		sun8i_de3_ccsc_set_coefficients(mixer->engine.regs, layer,
-						mode, encoding, range);
+		sun8i_de3_ccsc_setup(mixer->engine.regs, layer,
+				     mode, encoding, range);
 		return;
 	}
 
 	base = ccsc_base[mixer->cfg->ccsc][layer];
 
-	sun8i_csc_set_coefficients(mixer->engine.regs, base,
-				   mode, encoding, range);
-}
-
-void sun8i_csc_enable_ccsc(struct sun8i_mixer *mixer, int layer, bool enable)
-{
-	u32 base;
-
-	if (mixer->cfg->de_type == SUN8I_MIXER_DE3) {
-		sun8i_de3_ccsc_enable(mixer->engine.regs, layer, enable);
-		return;
-	}
-
-	base = ccsc_base[mixer->cfg->ccsc][layer];
-
-	sun8i_csc_enable(mixer->engine.regs, base, enable);
+	sun8i_csc_setup(mixer->engine.regs, base,
+			mode, encoding, range);
 }
diff --git a/drivers/gpu/drm/sun4i/sun8i_csc.h b/drivers/gpu/drm/sun4i/sun8i_csc.h
index 828b86fd0cab..27b6807fc786 100644
--- a/drivers/gpu/drm/sun4i/sun8i_csc.h
+++ b/drivers/gpu/drm/sun4i/sun8i_csc.h
@@ -28,10 +28,9 @@ enum sun8i_csc_mode {
 	SUN8I_CSC_MODE_YVU2RGB,
 };
 
-void sun8i_csc_set_ccsc_coefficients(struct sun8i_mixer *mixer, int layer,
-				     enum sun8i_csc_mode mode,
-				     enum drm_color_encoding encoding,
-				     enum drm_color_range range);
-void sun8i_csc_enable_ccsc(struct sun8i_mixer *mixer, int layer, bool enable);
+void sun8i_csc_config(struct sun8i_mixer *mixer, int layer,
+		      enum sun8i_csc_mode mode,
+		      enum drm_color_encoding encoding,
+		      enum drm_color_range range);
 
 #endif
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
index 727117658c6c..adcd05acba1b 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
@@ -213,14 +213,9 @@ static void sun8i_vi_layer_update_colors(struct sun8i_mixer *mixer, int channel,
 
 	fmt = state->fb->format;
 	csc_mode = sun8i_vi_layer_get_csc_mode(fmt);
-	if (csc_mode != SUN8I_CSC_MODE_OFF) {
-		sun8i_csc_set_ccsc_coefficients(mixer, channel, csc_mode,
-						state->color_encoding,
-						state->color_range);
-		sun8i_csc_enable_ccsc(mixer, channel, true);
-	} else {
-		sun8i_csc_enable_ccsc(mixer, channel, false);
-	}
+	sun8i_csc_config(mixer, channel, csc_mode,
+			 state->color_encoding,
+			 state->color_range);
 }
 
 static void sun8i_vi_layer_update_buffer(struct sun8i_mixer *mixer, int channel,
-- 
2.51.2