linux-kernel - [PATCH v3 3/5] gpu/drm: mediatek: hdmi: add check for CEA modes only

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Date:   Mon, 19 Apr 2021 09:32:42 +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 v3 3/5] gpu/drm: mediatek: hdmi: add check for CEA modes only

Some SoCs like the MT8167 are not validated and supported for HDMI modes
out of HDMI CEA modes, so add a configuration boolean to filter out
non-CEA modes.

Signed-off-by: Fabien Parent <fparent@...libre.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
 drivers/gpu/drm/mediatek/mtk_hdmi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index dea46d66e712..0539262e69d3 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -148,6 +148,7 @@ struct hdmi_audio_param {
 
 struct mtk_hdmi_conf {
 	bool tz_disabled;
+	bool cea_modes_only;
 };
 
 struct mtk_hdmi {
@@ -1222,6 +1223,9 @@ static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
 			return MODE_BAD;
 	}
 
+	if (hdmi->conf->cea_modes_only && !drm_match_cea_mode(mode))
+		return MODE_BAD;
+
 	if (mode->clock < 27000)
 		return MODE_CLOCK_LOW;
 	if (mode->clock > 297000)
-- 
2.25.1