[PATCH v4 13/16] drm/vc4: hdmi: Take the sink maximum TMDS clock into account

[Maxime Ripard]

In the function that validates that the clock isn't too high, we've only
taken our controller limitations into account so far.

However, the sink can have a limit on the maximum TMDS clock it can deal
with too which is exposed through the EDID and the drm_display_info.

Make sure we check it.

Signed-off-by: Maxime Ripard <maxime at cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 764f3c5cfa54..b68d3626d1a3 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -1266,12 +1266,18 @@ static enum drm_mode_status
 vc4_hdmi_encoder_clock_valid(const struct vc4_hdmi *vc4_hdmi,
 			     unsigned long long clock)
 {
+	const struct drm_connector *connector = &vc4_hdmi->connector;
+	const struct drm_display_info *info = &connector->display_info;
+
 	if (clock > vc4_hdmi->variant->max_pixel_clock)
 		return MODE_CLOCK_HIGH;
 
 	if (vc4_hdmi->disable_4kp60 && clock > HDMI_14_MAX_TMDS_CLK)
 		return MODE_CLOCK_HIGH;
 
+	if (info->max_tmds_clock && clock > (info->max_tmds_clock * 1000))
+		return MODE_CLOCK_HIGH;
+
 	return MODE_OK;
 }
 
-- 
2.34.1