[PATCH v10 23/69] drm/display: hdmi-state-helper: Set HDMI scrambling requirement
Cristian Ciocaltea <[email protected]>
| Newsgroups | org.freedesktop.lists.dri-devel,dev.linux.lists.linux-sunxi,org.infradead.lists.linux-arm-kernel,org.infradead.lists.linux-rockchip,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
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 <[email protected]> Tested-by: Maud Spierings <[email protected]> Tested-by: Diederik de Haas <[email protected]> # NanoPC-T6 LTS, Rock 5B Signed-off-by: Cristian Ciocaltea <[email protected]> --- 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 3377ea936120..9544eb8659aa 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -594,6 +594,9 @@ 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