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Luca Ceresoli
73cb588a6d
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 <victor.liu@nxp.com>
Link: https://patch.msgid.link/20260407-drm-lcdif-dbanc-v4-8-247a16e61ef9@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
111 lines
3.1 KiB
Plaintext
111 lines
3.1 KiB
Plaintext
if ARCH_MXC || COMPILE_TEST
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config DRM_IMX_LDB_HELPER
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tristate
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config DRM_IMX8MP_DW_HDMI_BRIDGE
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tristate "Freescale i.MX8MP HDMI-TX bridge support"
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depends on OF
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depends on COMMON_CLK
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select DRM_DW_HDMI
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select OF_OVERLAY
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select DRM_DISPLAY_CONNECTOR
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imply DRM_IMX8MP_HDMI_PAI
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imply DRM_IMX8MP_HDMI_PVI
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imply PHY_FSL_SAMSUNG_HDMI_PHY
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help
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Choose this to enable support for the internal HDMI encoder found
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on the i.MX8MP SoC.
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config DRM_IMX8MP_DW_HDMI_BRIDGE_CONNECTOR_FIXUP
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bool
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default y
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depends on DRM_IMX_LCDIF
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depends on DRM_IMX8MP_DW_HDMI_BRIDGE
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depends on OF
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help
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Modifies at early boot the live device tree of boards using the
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i.MX8MP fsl,imx8mp-hdmi-tx adding a hdmi-connector node linked to
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the hdmi-tx. This is needed to support bridge-connector usage in
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the i.MX8MP LCDIF driver.
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You need this if you use the i.MX8MP HDMI output and your board
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device tree file does not have an hdmi-connector node connected
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to it.
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config DRM_IMX8MP_HDMI_PAI
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tristate "Freescale i.MX8MP HDMI PAI bridge support"
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depends on OF
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select DRM_DW_HDMI
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select REGMAP
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select REGMAP_MMIO
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help
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Choose this to enable support for the internal HDMI TX Parallel
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Audio Interface found on the Freescale i.MX8MP SoC.
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config DRM_IMX8MP_HDMI_PVI
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tristate "Freescale i.MX8MP HDMI PVI bridge support"
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depends on OF
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help
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Choose this to enable support for the internal HDMI TX Parallel
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Video Interface found on the Freescale i.MX8MP SoC.
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config DRM_IMX8QM_LDB
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tristate "Freescale i.MX8QM LVDS display bridge"
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depends on OF
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depends on COMMON_CLK
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select DRM_IMX_LDB_HELPER
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select DRM_KMS_HELPER
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help
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Choose this to enable the internal LVDS Display Bridge(LDB) found in
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Freescale i.MX8qm processor. Official name of LDB is pixel mapper.
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config DRM_IMX8QXP_LDB
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tristate "Freescale i.MX8QXP LVDS display bridge"
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depends on OF
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depends on COMMON_CLK
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select DRM_IMX_LDB_HELPER
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select DRM_KMS_HELPER
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help
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Choose this to enable the internal LVDS Display Bridge(LDB) found in
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Freescale i.MX8qxp processor. Official name of LDB is pixel mapper.
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config DRM_IMX8QXP_PIXEL_COMBINER
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tristate "Freescale i.MX8QM/QXP pixel combiner"
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depends on OF
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depends on COMMON_CLK
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select DRM_KMS_HELPER
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help
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Choose this to enable pixel combiner found in
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Freescale i.MX8qm/qxp processors.
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config DRM_IMX8QXP_PIXEL_LINK
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tristate "Freescale i.MX8QM/QXP display pixel link"
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depends on OF
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depends on IMX_SCU
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select DRM_KMS_HELPER
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help
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Choose this to enable display pixel link found in
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Freescale i.MX8qm/qxp processors.
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config DRM_IMX8QXP_PIXEL_LINK_TO_DPI
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tristate "Freescale i.MX8QXP pixel link to display pixel interface"
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depends on OF
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select DRM_KMS_HELPER
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help
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Choose this to enable pixel link to display pixel interface(PXL2DPI)
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found in Freescale i.MX8qxp processor.
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config DRM_IMX93_MIPI_DSI
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tristate "Freescale i.MX93 specific extensions for Synopsys DW MIPI DSI"
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depends on OF
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depends on COMMON_CLK
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select DRM_DW_MIPI_DSI
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select GENERIC_PHY
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select GENERIC_PHY_MIPI_DPHY
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help
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Choose this to enable MIPI DSI controller found in Freescale i.MX93
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processor.
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endif # ARCH_MXC || COMPILE_TEST
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