linux-kernel - [PATCH 6/9] drm/vc4: hdmi: Swap CSC matrix channels for YUV444

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Message-Id: <20221207-rpi-hdmi-improvements-v1-6-6b15f774c13a@cerno.tech>
Date:   Wed, 07 Dec 2022 17:07:50 +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 6/9] drm/vc4: hdmi: Swap CSC matrix channels for YUV444

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

YUV444 requires the matrix coefficients to be programmed in a different
way than the other formats. Let's add a function to program it properly.

Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 299a8fe7a2ae..cb92d07680f0 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1259,6 +1259,20 @@ static void vc5_hdmi_set_csc_coeffs(struct vc4_hdmi *vc4_hdmi,
 	HDMI_WRITE(HDMI_CSC_34_33, (coeffs[2][3] << 16) | coeffs[2][2]);
 }
 
+static void vc5_hdmi_set_csc_coeffs_swap(struct vc4_hdmi *vc4_hdmi,
+					 const u16 coeffs[3][4])
+{
+	lockdep_assert_held(&vc4_hdmi->hw_lock);
+
+	/* YUV444 needs the CSC matrices using the channels in a different order */
+	HDMI_WRITE(HDMI_CSC_12_11, (coeffs[2][1] << 16) | coeffs[2][0]);
+	HDMI_WRITE(HDMI_CSC_14_13, (coeffs[2][3] << 16) | coeffs[2][2]);
+	HDMI_WRITE(HDMI_CSC_22_21, (coeffs[0][1] << 16) | coeffs[0][0]);
+	HDMI_WRITE(HDMI_CSC_24_23, (coeffs[0][3] << 16) | coeffs[0][2]);
+	HDMI_WRITE(HDMI_CSC_32_31, (coeffs[1][1] << 16) | coeffs[1][0]);
+	HDMI_WRITE(HDMI_CSC_34_33, (coeffs[1][3] << 16) | coeffs[1][2]);
+}
+
 static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi,
 			       struct drm_connector_state *state,
 			       const struct drm_display_mode *mode)
@@ -1282,7 +1296,8 @@ 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(vc4_hdmi, vc5_hdmi_csc_full_rgb_to_yuv_bt709[lim_range]);
+		vc5_hdmi_set_csc_coeffs_swap(vc4_hdmi,
+					     vc5_hdmi_csc_full_rgb_to_yuv_bt709[lim_range]);
 		break;
 
 	case VC4_HDMI_OUTPUT_YUV422:

-- 
2.38.1