Hi,
this patch set adds the support of the Lontium lt8912 MIPI to HDMI
bridge in the kernel.
It's only support the video part, not the audio part yet
since I don't have the datasheet of this component.
I get the current i2c configuration from Digi and
Boundary drivers.
Developed using the DB_DSIHD board from BoundaryDevices.
Update in v2
- Use standard data-lanes instead of a custom prop;
- Use hdmi-connector node.
Update in v3
- Fix indentation;
- Implement missing bridge functions;
- Add some comments.
Update in v4
- Fix bridge ops;
- Fix i2c error detection.
Update in v5
- Fix lt8912 name (lt8912b instead of lt8912);
- Implement HPD via a workaround. In fact I don't have the datasheet
of this component yet so I can't say if the configuration of the
registers is correct or if I have an HW issue on my board. So, I choose
to implement a fake version of HPD using a workqueue and polling the
status regularly.
Update in v6
- Fix a warning found by "kernel test robot"
Update in v7
- Fix HPD logic (via an HW emulation);
- HPD from chip is still not working.
Update in v8
- Remove HPD logic (will be added later when HW bug qill be fixed).
Thanks,
Adrien Grassein (2):
dt-bindings: display: bridge: Add documentation for LT8912B
drm/bridge: Introduce LT8912B DSI to HDMI bridge
.../display/bridge/lontium,lt8912b.yaml | 102 +++
MAINTAINERS | 6 +
drivers/gpu/drm/bridge/Kconfig | 14 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/lontium-lt8912b.c | 765 ++++++++++++++++++
5 files changed, 888 insertions(+)
create mode 100644
Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml
create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c
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2.25.1
