diff mbox series

[v11,20/74] drm/display: hdmi-state-helper: Add source TMDS rate validation

Message ID 20260901-dw-hdmi-qp-scramb-v11-20-bc12954a0688@collabora.com (mailing list archive)
State New
Headers
Series Add HDMI 2.0 support to DW HDMI QP TX |

Commit Message

Cristian Ciocaltea Sept. 1, 2026, 6:50 p.m. UTC 
Validate the computed TMDS character rate against
connector->hdmi.max_tmds_char_rate, when provided by the driver/source.

This gives HDMI connectors common support for rejecting modes whose TMDS
character rate exceeds the source supported limit, while still allowing
drivers with custom validation requirements to implement their own
tmds_char_rate_valid() callback.

Tested-by: Maud Spierings <maud_spierings@hotmail.com>
Tested-by: Diederik de Haas <diederik@cknow-tech.com>  # NanoPC-T6 LTS, Rock 5B
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
---
 drivers/gpu/drm/display/drm_hdmi_state_helper.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
index bccc5d7c8eed..3ef6de31dc02 100644
--- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c
+++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c
@@ -562,6 +562,10 @@  hdmi_clock_valid(const struct drm_connector *connector,
 	if (info->max_tmds_clock && clock > info->max_tmds_clock * 1000)
 		return MODE_CLOCK_HIGH;
 
+	if (connector->hdmi.max_tmds_char_rate &&
+	    clock > connector->hdmi.max_tmds_char_rate)
+		return MODE_CLOCK_HIGH;
+
 	if (funcs && funcs->tmds_char_rate_valid) {
 		enum drm_mode_status status;