linux-kernel - [PATCH v9 16/22] drm/meditek: dpi: Add matrix

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Date:   Mon, 28 Mar 2022 00:39:21 +0200
From:   Guillaume Ranquet <granquet@...libre.com>
To:     airlied@...ux.ie, angelogioacchino.delregno@...labora.com,
        chunfeng.yun@...iatek.com, chunkuang.hu@...nel.org,
        ck.hu@...iatek.com, daniel@...ll.ch, deller@....de,
        jitao.shi@...iatek.com, kishon@...com, krzk+dt@...nel.org,
        maarten.lankhorst@...ux.intel.com, matthias.bgg@...il.com,
        mripard@...nel.org, p.zabel@...gutronix.de, robh+dt@...nel.org,
        tzimmermann@...e.de, vkoul@...nel.org
Cc:     devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-phy@...ts.infradead.org, markyacoub@...gle.com
Subject: [PATCH v9 16/22] drm/meditek: dpi: Add matrix_sel helper

Add a mtk_dpi_matrix_sel() helper to update the DPI_MATRIX_SET
register depending on the color format.

Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 8198d3cf23ac..82f97c687652 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -385,6 +385,25 @@ static void mtk_dpi_config_disable_edge(struct mtk_dpi *dpi)
 		mtk_dpi_mask(dpi, dpi->conf->reg_h_fre_con, 0, EDGE_SEL_EN);
 }
 
+static void mtk_dpi_matrix_sel(struct mtk_dpi *dpi, enum mtk_dpi_out_color_format format)
+{
+	u32 matrix_sel = 0;
+
+	switch (format) {
+	case MTK_DPI_COLOR_FORMAT_YCBCR_422:
+	case MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL:
+	case MTK_DPI_COLOR_FORMAT_YCBCR_444:
+	case MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL:
+	case MTK_DPI_COLOR_FORMAT_XV_YCC:
+		if (dpi->mode.hdisplay <= 720)
+			matrix_sel = 0x2;
+		break;
+	default:
+		break;
+	}
+	mtk_dpi_mask(dpi, DPI_MATRIX_SET, matrix_sel, INT_MATRIX_SEL_MASK);
+}
+
 static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 					enum mtk_dpi_out_color_format format)
 {
@@ -392,6 +411,7 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 	    (format == MTK_DPI_COLOR_FORMAT_YCBCR_444_FULL)) {
 		mtk_dpi_config_yuv422_enable(dpi, false);
 		mtk_dpi_config_csc_enable(dpi, true);
+		mtk_dpi_matrix_sel(dpi, format);
 		if (dpi->conf->swap_input_support)
 			mtk_dpi_config_swap_input(dpi, false);
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_BGR);
@@ -399,6 +419,7 @@ static void mtk_dpi_config_color_format(struct mtk_dpi *dpi,
 		   (format == MTK_DPI_COLOR_FORMAT_YCBCR_422_FULL)) {
 		mtk_dpi_config_yuv422_enable(dpi, true);
 		mtk_dpi_config_csc_enable(dpi, true);
+		mtk_dpi_matrix_sel(dpi, format);
 		if (dpi->conf->swap_input_support)
 			mtk_dpi_config_swap_input(dpi, true);
 		mtk_dpi_config_channel_swap(dpi, MTK_DPI_OUT_CHANNEL_SWAP_RGB);
-- 
2.34.1