[PATCH v11 24/74] drm/display: hdmi-state-helper: Set HDMI scrambling requirement
From: Cristian Ciocaltea <hidden>
Date: 2026-09-01 18:51:16
Also in:
dri-devel, linux-arm-kernel, linux-rockchip, linux-sunxi, lkml
Subsystem:
drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
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. Acked-by: Maxime Ripard <mripard@kernel.org> Tested-by: Maud Spierings <redacted> Tested-by: Diederik de Haas <redacted> # NanoPC-T6 LTS, Rock 5B Signed-off-by: Cristian Ciocaltea <redacted> --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index 1e269b203b98..7cdb7ca3dc12 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c@@ -596,6 +596,9 @@ hdmi_compute_clock(const struct drm_connector *connector, conn_state->hdmi.tmds_char_rate = clock; + /* TODO: also check drm_display_info.hdmi.scdc.scrambling.low_rates */ + conn_state->hdmi.scrambler_needed = (clock > HDMI_1_3_TMDS_CHAR_RATE_MAX_HZ); + return 0; }
--
2.55.0