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 <[email protected]> Signed-off-by: Neil Armstrong <[email protected]> Signed-off-by: Chun-Kuang Hu <[email protected]>
Axel1400 · May 12, 2021 · c91026a · c91026a
1 parent 41ca9ca
commit c91026a
Showing 1 changed file with 5 additions and 0 deletions.
diff --git 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)