linux-kernel - [PATCH v5 3/4] drm/mediatek: add mt8183 dpi clock factor

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Message-ID: <20190807060257.57007-4-jitao.shi@mediatek.com>
Date:   Wed, 7 Aug 2019 14:02:56 +0800
From:   Jitao Shi <jitao.shi@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ian Campbell <ijc+devicetree@...lion.org.uk>,
        <linux-pwm@...r.kernel.org>, David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Jitao Shi <jitao.shi@...iatek.com>,
        Thierry Reding <treding@...dia.com>,
        Ajay Kumar <ajaykumar.rs@...sung.com>,
        Inki Dae <inki.dae@...sung.com>,
        Rahul Sharma <rahul.sharma@...sung.com>,
        Sean Paul <seanpaul@...omium.org>,
        Vincent Palatin <vpalatin@...omium.org>,
        Andy Yan <andy.yan@...k-chips.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Russell King <rmk+kernel@....linux.org.uk>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        Sascha Hauer <kernel@...gutronix.de>,
        <yingjoe.chen@...iatek.com>, <eddie.huang@...iatek.com>,
        <cawa.cheng@...iatek.com>, <bibby.hsieh@...iatek.com>,
        <ck.hu@...iatek.com>, <stonea168@....com>
Subject: [PATCH v5 3/4] drm/mediatek: add mt8183 dpi clock factor

The factor depends on the divider of DPI in MT8183, therefore,
we should fix this factor to the right and new one.

Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 743230864ba0..4f2700cbfdb7 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -672,6 +672,16 @@ static unsigned int mt2701_calculate_factor(int clock)
 		return 1;
 }
 
+static unsigned int mt8183_calculate_factor(int clock)
+{
+	if (clock <= 27000)
+		return 8;
+	else if (clock <= 167000)
+		return 4;
+	else
+		return 2;
+}
+
 static const struct mtk_dpi_conf mt8173_conf = {
 	.cal_factor = mt8173_calculate_factor,
 	.reg_h_fre_con = 0xe0,
@@ -683,6 +693,11 @@ static const struct mtk_dpi_conf mt2701_conf = {
 	.edge_sel_en = true,
 };
 
+static const struct mtk_dpi_conf mt8183_conf = {
+	.cal_factor = mt8183_calculate_factor,
+	.reg_h_fre_con = 0xe0,
+};
+
 static int mtk_dpi_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -779,6 +794,9 @@ static const struct of_device_id mtk_dpi_of_ids[] = {
 	{ .compatible = "mediatek,mt8173-dpi",
 	  .data = &mt8173_conf,
 	},
+	{ .compatible = "mediatek,mt8183-dpi",
+	  .data = &mt8183_conf,
+	},
 	{ },
 };
 
-- 
2.21.0