linux-kernel - [PATCH 1/3] drm/mediatek: mtk_dpi: Add check for max clock rate in mode

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Date:   Sun, 7 Feb 2021 20:58:48 +0800
From:   Jitao Shi <jitao.shi@...iatek.com>
To:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>
CC:     <airlied@...ux.ie>, <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <matthias.bgg@...il.com>, <srv_heupstream@...iatek.com>,
        <yingjoe.chen@...iatek.com>, <eddie.huang@...iatek.com>,
        <ck.hu@...iatek.com>, <dri-devel@...ts.freedesktop.org>,
        <devicetree@...r.kernel.org>, <stonea168@....com>,
        <huijuan.xie@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <shuijing.li@...iatek.com>,
        Jitao Shi <jitao.shi@...iatek.com>
Subject: [PATCH 1/3] drm/mediatek: mtk_dpi: Add check for max clock rate in mode_valid

Add per-platform max clock rate check in mtk_dpi_bridge_mode_valid.

Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 52f11a63a330..ffa4a0f1989f 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -118,6 +118,7 @@ struct mtk_dpi_yc_limit {
 struct mtk_dpi_conf {
 	unsigned int (*cal_factor)(int clock);
 	u32 reg_h_fre_con;
+	u32 max_clock_khz;
 	bool edge_sel_en;
 };
 
@@ -555,9 +556,22 @@ static void mtk_dpi_bridge_enable(struct drm_bridge *bridge)
 	mtk_dpi_set_display_mode(dpi, &dpi->mode);
 }
 
+static enum drm_mode_status
+mtk_dpi_bridge_mode_valid(struct drm_bridge *bridge,
+			  const struct drm_display_mode *mode)
+{
+	struct mtk_dpi *dpi = bridge_to_dpi(bridge);
+
+	if (dpi->conf->max_clock_khz && mode->clock > dpi->conf->max_clock_khz)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
 static const struct drm_bridge_funcs mtk_dpi_bridge_funcs = {
 	.attach = mtk_dpi_bridge_attach,
 	.mode_set = mtk_dpi_bridge_mode_set,
+	.mode_valid = mtk_dpi_bridge_mode_valid,
 	.disable = mtk_dpi_bridge_disable,
 	.enable = mtk_dpi_bridge_enable,
 };
@@ -673,17 +687,20 @@ static unsigned int mt8183_calculate_factor(int clock)
 static const struct mtk_dpi_conf mt8173_conf = {
 	.cal_factor = mt8173_calculate_factor,
 	.reg_h_fre_con = 0xe0,
+	.max_clock_khz = 300000,
 };
 
 static const struct mtk_dpi_conf mt2701_conf = {
 	.cal_factor = mt2701_calculate_factor,
 	.reg_h_fre_con = 0xb0,
 	.edge_sel_en = true,
+	.max_clock_khz = 150000,
 };
 
 static const struct mtk_dpi_conf mt8183_conf = {
 	.cal_factor = mt8183_calculate_factor,
 	.reg_h_fre_con = 0xe0,
+	.max_clock_khz = 100000,
 };
 
 static int mtk_dpi_probe(struct platform_device *pdev)
-- 
2.25.1