[PATCH v6 08/27] drm: sun4i: de3: add YUV support to the DE3 mixer

[Ryan Walklin <ryan@testtoast.com>]

From: Jernej Skrabec <jernej.skrabec@gmail.com>

The mixer in the DE3 display engine supports YUV 8 and 10 bit
formats in addition to 8-bit RGB. Add the required register
configuration and format enumeration callback functions to the mixer,
and store the in-use output format (defaulting to RGB) and color
encoding in the mixer configuration.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Ryan Walklin <ryan@testtoast.com>

---
Changelog v4..v5:
- Remove trailing whitespace

Changelog v5..v6:
- Move color format and encoding flags to mixer and add struct.
---
 drivers/gpu/drm/sun4i/sun8i_mixer.c | 54 +++++++++++++++++++++++++++--
 drivers/gpu/drm/sun4i/sun8i_mixer.h | 11 ++++++
 2 files changed, 62 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index a170f68708b1f..bc934186bfd6f 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -23,7 +23,10 @@
 #include <drm/drm_gem_dma_helper.h>
 #include <drm/drm_probe_helper.h>
 
+#include <uapi/linux/media-bus-format.h>
+
 #include "sun4i_drv.h"
+#include "sun50i_fmt.h"
 #include "sun8i_mixer.h"
 #include "sun8i_ui_layer.h"
 #include "sun8i_vi_layer.h"
@@ -390,12 +393,52 @@ static void sun8i_mixer_mode_set(struct sunxi_engine *engine,
 
 	DRM_DEBUG_DRIVER("Switching display mixer interlaced mode %s\n",
 			 interlaced ? "on" : "off");
+
+	if (mixer->color_model.format == MEDIA_BUS_FMT_RGB888_1X24)
+		val = SUN8I_MIXER_BLEND_COLOR_BLACK;
+	else
+		val = 0xff108080;
+
+	regmap_write(mixer->engine.regs,
+		     SUN8I_MIXER_BLEND_BKCOLOR(bld_base), val);
+	regmap_write(mixer->engine.regs,
+		     SUN8I_MIXER_BLEND_ATTR_FCOLOR(bld_base, 0), val);
+
+	if (mixer->cfg->has_formatter)
+		sun50i_fmt_setup(mixer, mode->hdisplay,
+				 mode->vdisplay, mixer->color_model.format);
+}
+
+static u32 *sun8i_mixer_get_supported_fmts(struct sunxi_engine *engine, u32 *num)
+{
+	struct sun8i_mixer *mixer = engine_to_sun8i_mixer(engine);
+	u32 *formats, count;
+
+	count = 0;
+
+	formats = kcalloc(5, sizeof(*formats), GFP_KERNEL);
+	if (!formats)
+		return NULL;
+
+	if (mixer->cfg->has_formatter) {
+		formats[count++] = MEDIA_BUS_FMT_UYYVYY10_0_5X30;
+		formats[count++] = MEDIA_BUS_FMT_YUV8_1X24;
+		formats[count++] = MEDIA_BUS_FMT_UYVY8_1X16;
+		formats[count++] = MEDIA_BUS_FMT_UYYVYY8_0_5X24;
+	}
+
+	formats[count++] = MEDIA_BUS_FMT_RGB888_1X24;
+
+	*num = count;
+
+	return formats;
 }
 
 static const struct sunxi_engine_ops sun8i_engine_ops = {
-	.commit		= sun8i_mixer_commit,
-	.layers_init	= sun8i_layers_init,
-	.mode_set	= sun8i_mixer_mode_set,
+	.commit			= sun8i_mixer_commit,
+	.layers_init		= sun8i_layers_init,
+	.mode_set		= sun8i_mixer_mode_set,
+	.get_supported_fmts	= sun8i_mixer_get_supported_fmts,
 };
 
 static const struct regmap_config sun8i_mixer_regmap_config = {
@@ -484,6 +527,11 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
 	if (!mixer->cfg)
 		return -EINVAL;
 
+	/* default output format, supported by all mixers */
+	mixer->color_model.format = MEDIA_BUS_FMT_RGB888_1X24;
+	/* default color encoding, ignored with RGB I/O */
+	mixer->color_model.encoding = DRM_COLOR_YCBCR_BT601;
+
 	regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h b/drivers/gpu/drm/sun4i/sun8i_mixer.h
index 8417b8fef2e1f..5f465a974fbdf 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
@@ -9,6 +9,7 @@
 #include <linux/clk.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
+#include <drm/drm_color_mgmt.h>
 #include <drm/drm_plane.h>
 
 #include "sunxi_engine.h"
@@ -177,6 +178,11 @@ struct sun8i_mixer_cfg {
 	unsigned int	scanline_yuv;
 };
 
+struct sun8i_color_model {
+	u32			format;
+	enum drm_color_encoding	encoding;
+};
+
 struct sun8i_mixer {
 	struct sunxi_engine		engine;
 
@@ -186,6 +192,11 @@ struct sun8i_mixer {
 
 	struct clk			*bus_clk;
 	struct clk			*mod_clk;
+
+	struct regmap			*top_regs;
+	struct regmap			*disp_regs;
+
+	struct sun8i_color_model	color_model;
 };
 
 enum {
-- 
2.48.1