linux-kernel - [PATCH 7/9] drm/vc4: hdmi: Add a function to retrieve the CSC matrix

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Message-Id: <20221207-rpi-hdmi-improvements-v1-7-6b15f774c13a@cerno.tech>
Date:   Wed, 07 Dec 2022 17:07:51 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Emma Anholt <emma@...olt.net>, Maxime Ripard <mripard@...nel.org>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Maxime Ripard <maxime@...no.tech>
Subject: [PATCH 7/9] drm/vc4: hdmi: Add a function to retrieve the CSC matrix

From: Dave Stevenson <dave.stevenson@...pberrypi.com>

The CSC matrix to use depends on the output format, its range and the
colorspace.

Since we're going to add more colorspaces, let's move the CSC matrix
retrieval to a function.

Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index cb92d07680f0..cd6775429b5e 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1273,6 +1273,20 @@ static void vc5_hdmi_set_csc_coeffs_swap(struct vc4_hdmi *vc4_hdmi,
 	HDMI_WRITE(HDMI_CSC_34_33, (coeffs[1][3] << 16) | coeffs[1][2]);
 }
 
+static const u16
+(*vc5_hdmi_get_yuv_csc_coeffs(struct vc4_hdmi *vc4_hdmi, u32 colorspace, bool limited))[4]
+{
+	switch (colorspace) {
+	default:
+	case DRM_MODE_COLORIMETRY_NO_DATA:
+	case DRM_MODE_COLORIMETRY_BT709_YCC:
+	case DRM_MODE_COLORIMETRY_XVYCC_709:
+	case DRM_MODE_COLORIMETRY_RGB_WIDE_FIXED:
+	case DRM_MODE_COLORIMETRY_RGB_WIDE_FLOAT:
+		return vc5_hdmi_csc_full_rgb_to_yuv_bt709[limited];
+	}
+}
+
 static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
 			       struct drm_connector_state *state,
 			       const struct drm_display_mode *mode)
@@ -1282,6 +1296,7 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
 		conn_state_to_vc4_hdmi_conn_state(state);
 	unsigned int lim_range = vc4_hdmi_is_full_range(vc4_hdmi, mode) ? 0 : 1;
 	unsigned long flags;
+	const u16 (*csc)[4];
 	u32 if_cfg = 0;
 	u32 if_xbar = 0x543210;
 	u32 csc_chan_ctl = 0;
@@ -1296,11 +1311,16 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
 
 	switch (vc4_state->output_format) {
 	case VC4_HDMI_OUTPUT_YUV444:
-		vc5_hdmi_set_csc_coeffs_swap(vc4_hdmi,
-					     vc5_hdmi_csc_full_rgb_to_yuv_bt709[lim_range]);
+		csc = vc5_hdmi_get_yuv_csc_coeffs(vc4_hdmi, state->colorspace,
+						  vc4_hdmi_is_full_range(vc4_hdmi, mode));
+
+		vc5_hdmi_set_csc_coeffs_swap(vc4_hdmi, csc);
 		break;
 
 	case VC4_HDMI_OUTPUT_YUV422:
+		csc = vc5_hdmi_get_yuv_csc_coeffs(vc4_hdmi, state->colorspace,
+						  vc4_hdmi_is_full_range(vc4_hdmi, mode));
+
 		csc_ctl |= VC4_SET_FIELD(VC5_MT_CP_CSC_CTL_FILTER_MODE_444_TO_422_STANDARD,
 					 VC5_MT_CP_CSC_CTL_FILTER_MODE_444_TO_422) |
 			VC5_MT_CP_CSC_CTL_USE_444_TO_422 |
@@ -1312,7 +1332,7 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
 		if_cfg |= VC4_SET_FIELD(VC5_DVP_HT_VEC_INTERFACE_CFG_SEL_422_FORMAT_422_LEGACY,
 					VC5_DVP_HT_VEC_INTERFACE_CFG_SEL_422);
 
-		vc5_hdmi_set_csc_coeffs(vc4_hdmi, vc5_hdmi_csc_full_rgb_to_yuv_bt709[lim_range]);
+		vc5_hdmi_set_csc_coeffs(vc4_hdmi, csc);
 		break;
 
 	case VC4_HDMI_OUTPUT_RGB:

-- 
2.38.1