[PATCH RFC 5/6] drm/omap: csc full range support

[Jyri Sarha]

From: Tomi Valkeinen <tomi.valkeinen at ti.com>

At the moment the driver always uses limited range when doing YUV-RGB
conversions. This patch adds full-range tables, and makes the code to
always use full-range tables.

In the future we should allow the user to select the color range instead
of hardcoding it.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
 drivers/gpu/drm/omapdrm/dss/dispc.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dispc.c b/drivers/gpu/drm/omapdrm/dss/dispc.c
index b53e63d..f2a2d08 100644
--- a/drivers/gpu/drm/omapdrm/dss/dispc.c
+++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
@@ -799,6 +799,8 @@ static void dispc_setup_color_conv_coef(void)
 {
 	int i;
 	int num_ovl = dss_feat_get_num_ovls();
+	/* always use full range for now */
+	bool use_full_range = true;
 
 	/* YUV -> RGB, ITU-R BT.601, limited range */
 	const struct csc_coef_yuv2rgb coefs_yuv2rgb_bt601_lim = {
@@ -808,6 +810,14 @@ static void dispc_setup_color_conv_coef(void)
 		false,			/* limited range */
 	};
 
+	/* YUV -> RGB, ITU-R BT.601, full range */
+	const struct csc_coef_yuv2rgb coefs_yuv2rgb_bt601_full = {
+		256,   0,  358,		/* ry, rcb, rcr */
+		256, -88, -182,		/* gy, gcb, gcr */
+		256, 452,    0,		/* by, bcb, bcr */
+		true,			/* full range */
+	};
+
 	/* RGB -> YUV, ITU-R BT.601, limited range */
 	const struct csc_coef_rgb2yuv coefs_rgb2yuv_bt601_lim = {
 		 66, 129,  25,		/* yr,   yg,  yb */
@@ -816,11 +826,30 @@ static void dispc_setup_color_conv_coef(void)
 		false,			/* limited range */
 	};
 
+	/* RGB -> YUV, ITU-R BT.601, full range */
+	const struct csc_coef_rgb2yuv coefs_rgb2yuv_bt601_full = {
+		 77,  150,  29,		/* yr,   yg,  yb */
+		-43,  -85, 128,		/* cbr, cbg, cbb */
+		128, -107, -21,		/* crr, crg, crb */
+		true,			/* full range */
+	};
+
+	const struct csc_coef_yuv2rgb *yuv2rgb;
+	const struct csc_coef_rgb2yuv *rgb2yuv;
+
+	if (use_full_range) {
+		yuv2rgb = &coefs_yuv2rgb_bt601_full;
+		rgb2yuv = &coefs_rgb2yuv_bt601_full;
+	} else {
+		yuv2rgb = &coefs_yuv2rgb_bt601_lim;
+		rgb2yuv = &coefs_rgb2yuv_bt601_lim;
+	}
+
 	for (i = 1; i < num_ovl; i++)
-		dispc_ovl_write_color_conv_coef(i, &coefs_yuv2rgb_bt601_lim);
+		dispc_ovl_write_color_conv_coef(i, yuv2rgb);
 
 	if (dispc.feat->has_writeback)
-		dispc_wb_write_color_conv_coef(&coefs_rgb2yuv_bt601_lim);
+		dispc_wb_write_color_conv_coef(rgb2yuv);
 }
 
 static void dispc_ovl_set_ba0(enum omap_plane_id plane, u32 paddr)
-- 
1.9.1