[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20210412093928.3321194-5-narmstrong@baylibre.com>
Date: Mon, 12 Apr 2021 11:39:27 +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 v2 4/5] gpu/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@...libre.com>
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
---
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 0539262e69d3..bc50d97f2553 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)
--
2.25.1
Powered by blists - more mailing lists