linux-kernel - [PATCH] gpu/drm: mediatek: hdmi: check for valid modes on MT8167

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Message-Id: <20210409084308.481185-1-narmstrong@baylibre.com>
Date:   Fri,  9 Apr 2021 10:43:08 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     chunkuang.hu@...nel.org, p.zabel@...gutronix.de,
        matthias.bgg@...il.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>,
        Fabien Parent <fparent@...libre.com>
Subject: [PATCH] gpu/drm: mediatek: hdmi: check for valid modes on MT8167

On MT8167, only CEA modes and anything using a clock below 148500 is
supported for HDMI. This change adds some checks to make sure the
video format is OK for MT8167.

Signed-off-by: Fabien Parent <fparent@...libre.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 8ee55f9e2954..991e2e935b93 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -148,6 +148,8 @@ struct hdmi_audio_param {
 
 struct mtk_hdmi_conf {
 	bool tz_disabled;
+	unsigned long max_mode_clock;
+	bool cea_modes_only;
 };
 
 struct mtk_hdmi {
@@ -1259,6 +1261,13 @@ static int mtk_hdmi_conn_mode_valid(struct drm_connector *conn,
 			return MODE_BAD;
 	}
 
+	if (hdmi->conf->cea_modes_only && !drm_match_cea_mode(mode))
+		return MODE_BAD;
+
+	if (hdmi->conf->max_mode_clock &&
+	    mode->clock > hdmi->conf->max_mode_clock)
+		return MODE_CLOCK_HIGH;
+
 	if (mode->clock < 27000)
 		return MODE_CLOCK_LOW;
 	if (mode->clock > 297000)
@@ -1810,10 +1819,18 @@ static const struct mtk_hdmi_conf mtk_hdmi_conf_mt2701 = {
 	.tz_disabled = true,
 };
 
+static const struct mtk_hdmi_conf mtk_hdmi_conf_mt8167 = {
+	.max_mode_clock = 148500,
+	.cea_modes_only = true,
+};
+
 static const struct of_device_id mtk_drm_hdmi_of_ids[] = {
 	{ .compatible = "mediatek,mt2701-hdmi",
 	  .data = &mtk_hdmi_conf_mt2701,
 	},
+	{ .compatible = "mediatek,mt8167-hdmi",
+	  .data = &mtk_hdmi_conf_mt8167,
+	},
 	{ .compatible = "mediatek,mt8173-hdmi",
 	},
 	{}
-- 
2.25.1