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: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180214192327.3250-7-ville.syrjala@linux.intel.com

1 files changed, 46 insertions, 15 deletions

diff --git a/drivers/gpu/drm/i915/intel_sprite.c b/drivers/gpu/drm/i915/intel_sprite.c
index 3025c609d688..36798ca1b8bb 100644
--- a/drivers/gpu/drm/i915/intel_sprite.c
+++ b/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;