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drm/mediatek: hdmi: Add optional limit on maximal HDMI mode clock

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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>
This commit is contained in:
Neil Armstrong 2021-04-19 09:32:43 +02:00 committed by Chun-Kuang Hu
parent 41ca9caaae
commit c91026a938
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/mediatek/mtk_hdmi.c
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@ -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)