[PATCH v8 11/39] drm/display: hdmi-state-helper: Set HDMI scrambling requirement

[Cristian Ciocaltea]

Set drm_connector_hdmi_state.scrambler_needed when the computed TMDS
character rate exceeds the HDMI 1.3 maximum TMDS character rate.

HDMI 2.0 requires scrambling above 340 MHz.  Centralize that clock-based
requirement in the HDMI state helper so drivers do not need to open-code
the threshold check.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 69ccfbf123fe..34e48e04d971 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -592,6 +592,7 @@ hdmi_compute_clock(const struct drm_connector *connector,
 		return -EINVAL;
 
 	conn_state->hdmi.tmds_char_rate = clock;
+	conn_state->hdmi.scrambler_needed = (clock > HDMI_1_3_TMDS_CHAR_RATE_MAX_HZ);
 
 	return 0;
 }

-- 
2.54.0