linux-kernel - [PATCH] drm/mediatek: fine tune the data lane trail by project dts

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Date:   Mon, 1 Feb 2021 11:47:55 +0800
From:   Jitao Shi <jitao.shi@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <yingjoe.chen@...iatek.com>,
        <eddie.huang@...iatek.com>, <cawa.cheng@...iatek.com>,
        <bibby.hsieh@...iatek.com>, <ck.hu@...iatek.com>,
        <stonea168@....com>, <huijuan.xie@...iatek.com>,
        <shuijing.li@...iatek.com>, Jitao Shi <jitao.shi@...iatek.com>
Subject: [PATCH] drm/mediatek: fine tune the data lane trail by project dts

Some panels or bridges require customized hs_da_trail time.
So add a property in devicetree for this panels and bridges.

Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dsi.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 8c70ec39bfe1..6e7092fa2fee 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -194,6 +194,7 @@ struct mtk_dsi {
 	struct clk *hs_clk;
 
 	u32 data_rate;
+	u32 da_trail_delta;
 
 	unsigned long mode_flags;
 	enum mipi_dsi_pixel_format format;
@@ -234,7 +235,7 @@ static void mtk_dsi_phy_timconfig(struct mtk_dsi *dsi)
 	timing->da_hs_prepare = (80 * data_rate_mhz + 4 * 1000) / 8000;
 	timing->da_hs_zero = (170 * data_rate_mhz + 10 * 1000) / 8000 + 1 -
 			     timing->da_hs_prepare;
-	timing->da_hs_trail = timing->da_hs_prepare + 1;
+	timing->da_hs_trail = timing->da_hs_prepare + 1 + dsi->da_trail_delta;
 
 	timing->ta_go = 4 * timing->lpx - 2;
 	timing->ta_sure = timing->lpx + 2;
@@ -1094,6 +1095,13 @@ static int mtk_dsi_probe(struct platform_device *pdev)
 		goto err_unregister_host;
 	}
 
+	ret = of_property_read_u32_index(dev->of_node, "da_trail_delta", 0,
+					 &dsi->da_trail_delta);
+	if (ret) {
+		dev_info(dev, "Can't get da_trail_delta, keep it as 0: %d\n", ret);
+		dsi->da_trail_delta = 0;
+	}
+
 	comp_id = mtk_ddp_comp_get_id(dev->of_node, MTK_DSI);
 	if (comp_id < 0) {
 		dev_err(dev, "Failed to identify by alias: %d\n", comp_id);
-- 
2.12.5