linux.git/drivers/gpu/drm/bridge/imx/Makefile, branch master

drm/bridge: imx8mp-hdmi-tx-connector-fixup: add an hdmi-connector when missing using a DT overlay at boot time

2026-04-14T11:52:32+00:00

The imx8mp-hdmi-tx is one of many drivers based on dw-hdmi. dw-hdmi in turn
can operate in two different modes, depending on the platform data as set
by the driver:

A. hdmi->plat_data->output_port = 0:
the HDMI output (port@1) in device tree is not used [0]

B. hdmi->plat_data->output_port = 1:
the HDMI output (port@1) is parsed to find the next bridge

The imx8mp-hdmi-tx driver falls in case A. This implies next_bridge will
always be NULL, and so dw_hdmi_bridge_attach() [1] will always fail if
called with the DRM_BRIDGE_ATTACH_NO_CONNECTOR flag.

In fact case A assumes that DRM_BRIDGE_ATTACH_NO_CONNECTOR is not set and
in that case it adds an HDMI Type A connector programmatically at bridge
attach time.

Support for DRM_BRIDGE_ATTACH_NO_CONNECTOR is implemented by dw-hdmi.c in
case B. However switching to base B requires that port@1 is connected to a
"next bridge" DT node, typically the HDMI connector, because dw-hdmi won't
add the connector when using DRM_BRIDGE_ATTACH_NO_CONNECTOR.

Many dts files for imx8mp-based boards in the kernel have such a connector
described and linked to port@1, so the pipeline will be fully attached up
to a display-connector and a drm_connector added by the
bridge-connector. Sadly some of those dts files don't have the connector
described. Adding it would solve the problem easily, but this would break
existing devices which do not update the dtb when upgrading to a newer
kernel.

In preparation for switching to case B while preserving backward
compatibility for such devices, introduce a module adding the
hdmi-connector node to the live device tree at init time. This will allow
the dw-hdmi code to find the next bridge (the one wrapping the
hdmi-connector) and let the pipeline work as before.

The module is inserted only if there is no endpoint in port@1. So boards
whose device tree describe the connector will not have the device tre
modified, and will start isntantiating the correct HDMI connector type as
described in the device tree.

For boards lacking a connector description in DT the overlay will be added,
abd the HDMI connector will be Type A, which is a reasonable fallback and
is what the driver is currently doing.

[0] https://elixir.bootlin.com/linux/v7.0-rc1/source/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c#L3310
[1] https://elixir.bootlin.com/linux/v7.0-rc1/source/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c#L2907

Reviewed-by: Liu Ying
Link: https://patch.msgid.link/20260407-drm-lcdif-dbanc-v4-8-247a16e61ef9@bootlin.com
Signed-off-by: Luca Ceresoli

drm/bridge: Move legacy bridge driver out of imx directory for multi-platform use

2026-04-09T12:10:21+00:00

As suggested by Dmitry, the DRM legacy bridge driver can be pulled
out of imx/ subdir for multi-platform use. The driver is also renamed
to make it more generic and suitable for platforms other than i.MX.

Signed-off-by: Damon Ding 
Suggested-by: Dmitry Baryshkov 
Reviewed-by: Luca Ceresoli 
Tested-by: Marek Szyprowski 
Tested-by: Heiko Stuebner  # rk3588
Link: https://patch.msgid.link/20260409065301.446670-3-damon.ding@rock-chips.com
Signed-off-by: Luca Ceresoli

drm/bridge: imx: add driver for HDMI TX Parallel Audio Interface

2025-09-29T01:46:04+00:00

The HDMI TX Parallel Audio Interface (HTX_PAI) is a digital module that
acts as the bridge between the Audio Subsystem to the HDMI TX Controller.
This IP block is found in the HDMI subsystem of the i.MX8MP SoC.

Data received from the audio subsystem can have an arbitrary component
ordering. The HTX_PAI block has integrated muxing options to select which
sections of the 32-bit input data word will be mapped to each IEC60958
field. The HTX_PAI_FIELD_CTRL register contains mux selects to
individually select P,C,U,V,Data, and Preamble.

Use component helper so that imx8mp-hdmi-tx will be aggregate driver,
imx8mp-hdmi-pai will be component driver, then imx8mp-hdmi-pai can use
bind() ops to get the plat_data from imx8mp-hdmi-tx device.

Signed-off-by: Shengjiu Wang 
Reviewed-by: Liu Ying 
Tested-by: Alexander Stein 
Signed-off-by: Liu Ying 
Link: https://lore.kernel.org/r/20250923053001.2678596-6-shengjiu.wang@nxp.com

drm/imx: add internal bridge handling display-timings DT node

2024-09-02T23:35:35+00:00

i.MX DRM DT bindings allow using either a proper panel / bridge graph to
provide information about connected panels, or just a display-timings DT
node, describing just the timings and the flags. Add helper bridge
driver supporting the latter usecase. It will be used by both LDB and
parallel-display drivers.

Reviewed-by: Philipp Zabel 
Tested-by: Chris Healy 
Tested-by: Philipp Zabel  # on imx6q-nitrogen6x
Link: https://patchwork.freedesktop.org/patch/msgid/20240602-drm-imx-cleanup-v3-9-e549e2a43100@linaro.org
Signed-off-by: Dmitry Baryshkov

drm/bridge: imx: add bridge wrapper driver for i.MX8MP DWC HDMI

2024-02-06T08:05:56+00:00

Add a simple wrapper driver for the DWC HDMI bridge driver that
implements the few bits that are necessary to abstract the i.MX8MP
SoC integration.

Signed-off-by: Lucas Stach 
Reviewed-by: Laurent Pinchart 
Tested-by: Marek Vasut 
Tested-by: Adam Ford  #imx8mp-beacon
Tested-by: Richard Leitner 
Tested-by: Frieder Schrempf 
Tested-by: Luca Ceresoli 
Signed-off-by: Adam Ford 
Link: https://lore.kernel.org/r/20240203165307.7806-11-aford173@gmail.com
Signed-off-by: Neil Armstrong 
Link: https://patchwork.freedesktop.org/patch/msgid/20240203165307.7806-11-aford173@gmail.com

drm/bridge: imx: add driver for HDMI TX Parallel Video Interface

2024-02-05T11:16:44+00:00

This IP block is found in the HDMI subsystem of the i.MX8MP SoC. It has a
full timing generator and can switch between different video sources. On
the i.MX8MP however the only supported source is the LCDIF. The block
just needs to be powered up and told about the polarity of the video
sync signals to act in bypass mode.

Signed-off-by: Lucas Stach 
Reviewed-by: Luca Ceresoli 
Tested-by: Marek Vasut 
Tested-by: Luca Ceresoli 
Tested-by: Richard Leitner 
Tested-by: Frieder Schrempf 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Luca Ceresoli 
Tested-by: Luca Ceresoli 
Tested-by: Fabio Estevam 
Signed-off-by: Adam Ford 
Link: https://lore.kernel.org/r/20240203165307.7806-9-aford173@gmail.com
Signed-off-by: Neil Armstrong 
Link: https://patchwork.freedesktop.org/patch/msgid/20240203165307.7806-9-aford173@gmail.com

drm/bridge: imx: Add i.MX93 MIPI DSI support

2023-10-16T09:38:47+00:00

Freescale i.MX93 SoC embeds a Synopsys Designware MIPI DSI host
controller and a Synopsys Designware MIPI DPHY.  Some configurations
and extensions to them are controlled by i.MX93 media blk-ctrl.

Add a DRM bridge for i.MX93 MIPI DSI by using existing DW MIPI DSI
bridge helpers and implementing i.MX93 MIPI DSI specific extensions.

Signed-off-by: Liu Ying 
Reviewed-by: Robert Foss 
Signed-off-by: Robert Foss 
Link: https://patchwork.freedesktop.org/patch/msgid/20230821034008.3876938-10-victor.liu@nxp.com

drm/bridge: imx: turn imx8{qm,qxp}-ldb into single-object modules

2023-06-05T13:59:01+00:00

With the previous fix, these modules are built from a single C file.

Rename the source files so they match the module names.

Signed-off-by: Masahiro Yamada 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Liu Ying 
Signed-off-by: Robert Foss 
Link: https://patchwork.freedesktop.org/patch/msgid/20230605120021.1774711-2-masahiroy@kernel.org

drm/bridge: imx: fix mixed module-builtin object

2023-06-05T13:59:00+00:00

With CONFIG_DRM_IMX8QM_LDB=m and CONFIG_DRM_IMX8QXP_LDB=y (or vice
versa), imx-ldb-helper.o is linked to a module and also to vmlinux
even though the expected CFLAGS are different between builtins and
modules.

This is the same situation as fixed by commit 637a642f5ca5 ("zstd:
Fixing mixed module-builtin objects").

Split imx-ldb-helper.c into a separate module.

Signed-off-by: Masahiro Yamada 
Reviewed-by: Laurent Pinchart 
Reviewed-by: Liu Ying 
Signed-off-by: Robert Foss 
Link: https://patchwork.freedesktop.org/patch/msgid/20230605120021.1774711-1-masahiroy@kernel.org

drm/bridge: imx: Add LDB support for i.MX8qm

2022-06-20T19:15:19+00:00

This patch adds a drm bridge driver for i.MX8qm LVDS display bridge(LDB)
which is officially named as pixel mapper.  The LDB has two channels.
Each of them supports up to 30bpp parallel input color format and can
map the input to VESA or JEIDA standards.  The two channels can be used
simultaneously, either in dual mode or split mode.  In dual mode, the
two channels output identical data.  In split mode, channel0 outputs
odd pixels and channel1 outputs even pixels.  This patch supports the
LDB single mode and split mode.

Tested-by: Marcel Ziswiler  # Colibri iMX8X, LT170410-2WHC, LP156WF1
Reviewed-by: Robert Foss 
Signed-off-by: Liu Ying 
Acked-by: Sakari Ailus 
Signed-off-by: Robert Foss 
Link: https://patchwork.freedesktop.org/patch/msgid/20220611141421.718743-13-victor.liu@nxp.com