Unverified Commit 15a80921 authored by Maxime Ripard's avatar Maxime Ripard
Browse files

drm/vc4: hdmi: Take the sink maximum TMDS clock into account 



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: default avatarMaxime Ripard <maxime@cerno.tech>
Acked-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220222164042.403112-5-maxime@cerno.tech
parent 595dcf4e

drivers/gpu/drm/vc4/vc4_hdmi.c

+6 −0
Original line number Diff line number Diff line
@@ -1249,12 +1249,18 @@ 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;

}