drm/display: hdmi-state-helper: Set HDMI scrambling requirement

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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 <maud_spierings@hotmail.com>
Tested-by: Diederik de Haas <diederik@cknow-tech.com>  # NanoPC-T6 LTS, Rock 5B
Tested-by: Igor Paunovic <royalnet026@gmail.com> # RK3588 Orange Pi 5 Plus, dual HDMI
Tested-by: Robin Räber <robin.raebi@gmail.com>
Link: https://patch.msgid.link/20260901-dw-hdmi-qp-scramb-v11-24-bc12954a0688@collabora.com
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>

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Cristian Ciocaltea 2026-09-01 21:50:48 +03:00

parent 6867cd55ee

commit 23eef7a1c5

1 changed files with 3 additions and 0 deletions

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drivers/gpu/drm/display/drm_hdmi_state_helper.c

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