Backport the generic DRM HDMI CEC helpers (drm_hdmi_cec_helper and
drm_hdmi_cec_notifier_helper) along with the drm_connector CEC state,
drm_bridge CEC callbacks, and drm_bridge_connector glue that the
adapter registration path requires. Propagate the HDMI physical
address to the CEC adapter from the HDMI state helper hotplug path.
Implement the CEC adapter in dw-hdmi-qp: register definitions, IRQ
handling, transmit and receive paths, logical address programming,
and enable/disable. Pass the named "cec" IRQ and the HDMI reference
clock rate down from dw_hdmi_qp-rockchip so the timer base is
initialised from the actual reference clock.
Enable CONFIG_DRM_DW_HDMI_QP_CEC in tart_defconfig.
In some application scenarios, we hope to get the corresponding
connector when the bridge's detect hook is invoked.
In most cases, we can get the connector by drm_atomic_get_connector_for_encoder
if the encoder attached to the bridge is enabled, however there will
still be some scenarios where the detect hook of the bridge is called
but the corresponding encoder has not been enabled yet. For instance,
this occurs when the device is hot plug in for the first time.
Since the call to bridge's detect is initiated by the connector, passing
down the corresponding connector directly will make things simpler.
Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250703125027.311109-3-andyshrk@163.com
[DB: added the chunk to the cdn-dp driver]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Date: Wed, 03 Dec 2025 20:27:54 +0200 [thread overview]
Message-ID: <20251203-dw-hdmi-qp-scramb-v1-3-836fe7401a69@collabora.com> (raw)
In-Reply-To: <20251203-dw-hdmi-qp-scramb-v1-0-836fe7401a69@collabora.com>
Add support for HDMI 2.0 display modes, e.g. 4K@60Hz, by permitting TMDS
character rates above the 340 MHz limit of HDMI 1.4b.
Hence, provide the required SCDC management, including the high TMDS
clock ratio and scrambling setup, and filter out the HDMI 2.1 modes.
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
