From c91026a938c261c2241c391a12b7f99647cb8a06 Mon Sep 17 00:00:00 2001
From: Neil Armstrong <narmstrong@baylibre.com>
Date: Mon, 19 Apr 2021 09:32:43 +0200
Subject: [PATCH] drm/mediatek: hdmi: Add optional limit on maximal HDMI mode
clock
Some SoCs like the MT8167 have a hard limit on the maximal
supported HDMI TMDS clock, so add a configuration value to
filter out those modes.
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
---
drivers/gpu/drm/mediatek/mtk_hdmi.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c
index 0539262e69d39..bc50d97f2553f 100644
--- a/drivers/gpu/drm/mediatek/mtk_hdmi.c
+++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c
@@ -149,6 +149,7 @@ struct hdmi_audio_param {
struct mtk_hdmi_conf {
bool tz_disabled;
bool cea_modes_only;
+ unsigned long max_mode_clock;
};
struct mtk_hdmi {
@@ -1226,6 +1227,10 @@ static int mtk_hdmi_bridge_mode_valid(struct drm_bridge *bridge,
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)
--
2.30.2