drm/i915: Add support for the YCbCr COLOR_ENCODING property

Add support for the COLOR_ENCODING plane property which selects
the matrix coefficients used for the YCbCr->RGB conversion. Our
hardware can generally handle BT.601 and BT.709.

CHV pipe B sprites have a fully programmable matrix, so in theory
we could handle anything, but it doesn't seem all that useful to
expose anything beyond BT.601 and BT.709 at this time.

GLK can supposedly do BT.2020, but let's leave enabling that for
the future as well.

v2: Rename bit defines to match the spec more closely (Shashank)

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Daniel Stone <daniel@fooishbar.org>
Cc: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Uma Shankar <uma.shankar@intel.com>
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Jyri Sarha <jsarha@ti.com>
Reviewed-by: NShashank Sharma <shashank.sharma@intel.com>
Signed-off-by: NVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214192327.3250-7-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/i915_reg.h

@@ -6113,6 +6113,7 @@ enum {
 #define   DVS_PIPE_CSC_ENABLE   (1<<24)
 #define   DVS_SOURCE_KEY	(1<<22)
 #define   DVS_RGB_ORDER_XBGR	(1<<20)
+#define   DVS_YUV_FORMAT_BT709	(1<<18)
 #define   DVS_YUV_BYTE_ORDER_MASK (3<<16)
 #define   DVS_YUV_ORDER_YUYV	(0<<16)
 #define   DVS_YUV_ORDER_UYVY	(1<<16)
@@ -6183,7 +6184,7 @@ enum {
 #define   SPRITE_SOURCE_KEY		(1<<22)
 #define   SPRITE_RGB_ORDER_RGBX		(1<<20) /* only for 888 and 161616 */
 #define   SPRITE_YUV_TO_RGB_CSC_DISABLE	(1<<19)
-#define   SPRITE_YUV_CSC_FORMAT_BT709	(1<<18) /* 0 is BT601 */
+#define   SPRITE_YUV_TO_RGB_CSC_FORMAT_BT709	(1<<18) /* 0 is BT601 */
 #define   SPRITE_YUV_BYTE_ORDER_MASK	(3<<16)
 #define   SPRITE_YUV_ORDER_YUYV		(0<<16)
 #define   SPRITE_YUV_ORDER_UYVY		(1<<16)
@@ -6259,6 +6260,7 @@ enum {
 #define   SP_FORMAT_RGBA8888		(0xf<<26)
 #define   SP_ALPHA_PREMULTIPLY		(1<<23) /* CHV pipe B */
 #define   SP_SOURCE_KEY			(1<<22)
+#define   SP_YUV_FORMAT_BT709		(1<<18)
 #define   SP_YUV_BYTE_ORDER_MASK	(3<<16)
 #define   SP_YUV_ORDER_YUYV		(0<<16)
 #define   SP_YUV_ORDER_UYVY		(1<<16)
@@ -6383,6 +6385,7 @@ enum {
 #define   PLANE_CTL_KEY_ENABLE_DESTINATION	(  2 << 21)
 #define   PLANE_CTL_ORDER_BGRX			(0 << 20)
 #define   PLANE_CTL_ORDER_RGBX			(1 << 20)
+#define   PLANE_CTL_YUV_TO_RGB_CSC_FORMAT_BT709	(1 << 18)
 #define   PLANE_CTL_YUV422_ORDER_MASK		(0x3 << 16)
 #define   PLANE_CTL_YUV422_YUYV			(  0 << 16)
 #define   PLANE_CTL_YUV422_UYVY			(  1 << 16)

drivers/gpu/drm/i915/intel_display.c

@@ -3536,6 +3536,9 @@ u32 skl_plane_ctl(const struct intel_crtc_state *crtc_state,
 			PLANE_CTL_PIPE_GAMMA_ENABLE |
 			PLANE_CTL_PIPE_CSC_ENABLE |
 			PLANE_CTL_PLANE_GAMMA_DISABLE;
+
+		if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
+			plane_ctl |= PLANE_CTL_YUV_TO_RGB_CSC_FORMAT_BT709;
 	}
 
 	plane_ctl |= skl_plane_ctl_format(fb->format->format);
@@ -3565,8 +3568,12 @@ u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state,
 	plane_color_ctl |= PLANE_COLOR_PLANE_GAMMA_DISABLE;
 	plane_color_ctl |= glk_plane_color_ctl_alpha(fb->format->format);
 
-	if (intel_format_is_yuv(fb->format->format))
-		plane_color_ctl |= PLANE_COLOR_CSC_MODE_YUV601_TO_RGB709;
+	if (intel_format_is_yuv(fb->format->format)) {
+		if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
+			plane_color_ctl |= PLANE_COLOR_CSC_MODE_YUV709_TO_RGB709;
+		else
+			plane_color_ctl |= PLANE_COLOR_CSC_MODE_YUV601_TO_RGB709;
+	}
 
 	return plane_color_ctl;
 }
@@ -13289,6 +13296,14 @@ intel_primary_plane_create(struct drm_i915_private *dev_priv, enum pipe pipe)
 						   DRM_MODE_ROTATE_0,
 						   supported_rotations);
 
+	if (INTEL_GEN(dev_priv) >= 9)
+		drm_plane_create_color_properties(&primary->base,
+						  BIT(DRM_COLOR_YCBCR_BT601) |
+						  BIT(DRM_COLOR_YCBCR_BT709),
+						  BIT(DRM_COLOR_YCBCR_LIMITED_RANGE),
+						  DRM_COLOR_YCBCR_BT601,
+						  DRM_COLOR_YCBCR_LIMITED_RANGE);
+
 	drm_plane_helper_add(&primary->base, &intel_plane_helper_funcs);
 
 	return primary;

drivers/gpu/drm/i915/intel_sprite.c

@@ -352,30 +352,45 @@ chv_update_csc(const struct intel_plane_state *plane_state)
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);
 	const struct drm_framebuffer *fb = plane_state->base.fb;
 	enum plane_id plane_id = plane->id;
+	/*
+	 * |r|   | c0 c1 c2 |   |cr|
+	 * |g| = | c3 c4 c5 | x |y |
+	 * |b|   | c6 c7 c8 |   |cb|
+	 *
+	 * Coefficients are s3.12.
+	 *
+	 * Cb and Cr apparently come in as signed already, and
+	 * we always get full range data in on account of CLRC0/1.
+	 */
+	static const s16 csc_matrix[][9] = {
+		/* BT.601 full range YCbCr -> full range RGB */
+		[DRM_COLOR_YCBCR_BT601] = {
+			 5743, 4096,     0,
+			-2925, 4096, -1410,
+			    0, 4096,  7258,
+		},
+		/* BT.709 full range YCbCr -> full range RGB */
+		[DRM_COLOR_YCBCR_BT709] = {
+			 6450, 4096,     0,
+			-1917, 4096,  -767,
+			    0, 4096,  7601,
+		},
+	};
+	const s16 *csc = csc_matrix[plane_state->base.color_encoding];
 
 	/* Seems RGB data bypasses the CSC always */
 	if (!intel_format_is_yuv(fb->format->format))
 		return;
 
-	/*
-	 * BT.601 full range YCbCr -> full range RGB
-	 *
-	 * |r|   | 5743 4096     0|   |cr|
-	 * |g| = |-2925 4096 -1410| x |y |
-	 * |b|   |    0 4096  7258|   |cb|
-	 *
-	 * Cb and Cr apparently come in as signed already,
-	 * and we get full range data in on account of CLRC0/1
-	 */
 	I915_WRITE_FW(SPCSCYGOFF(plane_id), SPCSC_OOFF(0) | SPCSC_IOFF(0));
 	I915_WRITE_FW(SPCSCCBOFF(plane_id), SPCSC_OOFF(0) | SPCSC_IOFF(0));
 	I915_WRITE_FW(SPCSCCROFF(plane_id), SPCSC_OOFF(0) | SPCSC_IOFF(0));
 
-	I915_WRITE_FW(SPCSCC01(plane_id), SPCSC_C1(4096) | SPCSC_C0(5743));
-	I915_WRITE_FW(SPCSCC23(plane_id), SPCSC_C1(-2925) | SPCSC_C0(0));
-	I915_WRITE_FW(SPCSCC45(plane_id), SPCSC_C1(-1410) | SPCSC_C0(4096));
-	I915_WRITE_FW(SPCSCC67(plane_id), SPCSC_C1(4096) | SPCSC_C0(0));
-	I915_WRITE_FW(SPCSCC8(plane_id), SPCSC_C0(7258));
+	I915_WRITE_FW(SPCSCC01(plane_id), SPCSC_C1(csc[1]) | SPCSC_C0(csc[0]));
+	I915_WRITE_FW(SPCSCC23(plane_id), SPCSC_C1(csc[3]) | SPCSC_C0(csc[2]));
+	I915_WRITE_FW(SPCSCC45(plane_id), SPCSC_C1(csc[5]) | SPCSC_C0(csc[4]));
+	I915_WRITE_FW(SPCSCC67(plane_id), SPCSC_C1(csc[7]) | SPCSC_C0(csc[6]));
+	I915_WRITE_FW(SPCSCC8(plane_id), SPCSC_C0(csc[8]));
 
 	I915_WRITE_FW(SPCSCYGICLAMP(plane_id), SPCSC_IMAX(1023) | SPCSC_IMIN(0));
 	I915_WRITE_FW(SPCSCCBICLAMP(plane_id), SPCSC_IMAX(512) | SPCSC_IMIN(-512));
@@ -476,6 +491,9 @@ static u32 vlv_sprite_ctl(const struct intel_crtc_state *crtc_state,
 		return 0;
 	}
 
+	if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
+		sprctl |= SP_YUV_FORMAT_BT709;
+
 	if (fb->modifier == I915_FORMAT_MOD_X_TILED)
 		sprctl |= SP_TILED;
 
@@ -629,6 +647,9 @@ static u32 ivb_sprite_ctl(const struct intel_crtc_state *crtc_state,
 		return 0;
 	}
 
+	if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
+		sprctl |= SPRITE_YUV_TO_RGB_CSC_FORMAT_BT709;
+
 	if (fb->modifier == I915_FORMAT_MOD_X_TILED)
 		sprctl |= SPRITE_TILED;
 
@@ -785,6 +806,9 @@ static u32 g4x_sprite_ctl(const struct intel_crtc_state *crtc_state,
 		return 0;
 	}
 
+	if (plane_state->base.color_encoding == DRM_COLOR_YCBCR_BT709)
+		dvscntr |= DVS_YUV_FORMAT_BT709;
+
 	if (fb->modifier == I915_FORMAT_MOD_X_TILED)
 		dvscntr |= DVS_TILED;
 
@@ -1501,6 +1525,13 @@ intel_sprite_plane_create(struct drm_i915_private *dev_priv,
 					   DRM_MODE_ROTATE_0,
 					   supported_rotations);
 
+	drm_plane_create_color_properties(&intel_plane->base,
+					  BIT(DRM_COLOR_YCBCR_BT601) |
+					  BIT(DRM_COLOR_YCBCR_BT709),
+					  BIT(DRM_COLOR_YCBCR_LIMITED_RANGE),
+					  DRM_COLOR_YCBCR_BT601,
+					  DRM_COLOR_YCBCR_LIMITED_RANGE);
+
 	drm_plane_helper_add(&intel_plane->base, &intel_plane_helper_funcs);
 
 	return intel_plane;