linux-kernel - [PATCH 08/22] drm/mediatek: dpi: implement a CK/DE pol toggle in SoC config

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Message-Id: <20220325171511.23493-9-granquet@baylibre.com>
Date:   Fri, 25 Mar 2022 18:14:57 +0100
From:   Guillaume Ranquet <granquet@...libre.com>
To:     chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...ux.ie,
        daniel@...ll.ch, robh+dt@...nel.org,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, matthias.bgg@...il.com,
        chunfeng.yun@...iatek.com, kishon@...com, vkoul@...nel.org,
        deller@....de, ck.hu@...iatek.com, jitao.shi@...iatek.com,
        angelogioacchino.delregno@...labora.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-phy@...ts.infradead.org, linux-fbdev@...r.kernel.org,
        markyacoub@...gle.com
Subject: [PATCH 08/22] drm/mediatek: dpi: implement a CK/DE pol toggle in SoC config

Adds a bit of flexibility to support SoCs without CK/DE pol support

Signed-off-by: Guillaume Ranquet <granquet@...libre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 4746eb342567..545a1337cc89 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -125,6 +125,7 @@ struct mtk_dpi_conf {
 	bool edge_sel_en;
 	const u32 *output_fmts;
 	u32 num_output_fmts;
+	bool is_ck_de_pol;
 	const struct mtk_dpi_yc_limit *limit;
 };
 
@@ -211,13 +212,20 @@ static void mtk_dpi_config_pol(struct mtk_dpi *dpi,
 			       struct mtk_dpi_polarities *dpi_pol)
 {
 	unsigned int pol;
+	unsigned int mask;
 
-	pol = (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ? 0 : CK_POL) |
-	      (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ? 0 : DE_POL) |
-	      (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 : HSYNC_POL) |
+	mask = HSYNC_POL | VSYNC_POL;
+	pol = (dpi_pol->hsync_pol == MTK_DPI_POLARITY_RISING ? 0 : HSYNC_POL) |
 	      (dpi_pol->vsync_pol == MTK_DPI_POLARITY_RISING ? 0 : VSYNC_POL);
-	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol,
-		     CK_POL | DE_POL | HSYNC_POL | VSYNC_POL);
+	if (dpi->conf->is_ck_de_pol) {
+		mask |= CK_POL | DE_POL;
+		pol |= (dpi_pol->ck_pol == MTK_DPI_POLARITY_RISING ?
+			0 : CK_POL) |
+		       (dpi_pol->de_pol == MTK_DPI_POLARITY_RISING ?
+			0 : DE_POL);
+	}
+
+	mtk_dpi_mask(dpi, DPI_OUTPUT_SETTING, pol, mask);
 }
 
 static void mtk_dpi_config_3d(struct mtk_dpi *dpi, bool en_3d)
@@ -799,6 +807,7 @@ static const struct mtk_dpi_conf mt8173_conf = {
 	.max_clock_khz = 300000,
 	.output_fmts = mt8173_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
+	.is_ck_de_pol = true,
 	.limit = &mtk_dpi_limit,
 };
 
@@ -809,6 +818,7 @@ static const struct mtk_dpi_conf mt2701_conf = {
 	.max_clock_khz = 150000,
 	.output_fmts = mt8173_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
+	.is_ck_de_pol = true,
 	.limit = &mtk_dpi_limit,
 };
 
@@ -818,6 +828,7 @@ static const struct mtk_dpi_conf mt8183_conf = {
 	.max_clock_khz = 100000,
 	.output_fmts = mt8183_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8183_output_fmts),
+	.is_ck_de_pol = true,
 	.limit = &mtk_dpi_limit,
 };
 
@@ -827,6 +838,7 @@ static const struct mtk_dpi_conf mt8192_conf = {
 	.max_clock_khz = 150000,
 	.output_fmts = mt8173_output_fmts,
 	.num_output_fmts = ARRAY_SIZE(mt8173_output_fmts),
+	.is_ck_de_pol = true,
 	.limit = &mtk_dpi_limit,
 };
 
-- 
2.34.1