media: i2c: ov9281: Fix async subdev matching for Rockchip CSI2 DPHY #509
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The Rockchip CSI2 DPHY driver expects sensors to register with endpoint fwnode for async matching to work. The ov9281 driver was using v4l2_async_register_subdev_sensor() which registers with device fwnode, causing the async matching to fail. Fix this by explicitly setting sd->fwnode to the endpoint fwnode before registration and using v4l2_async_register_subdev() instead. Without this fix, the sensor is never bound to the DPHY and camera capture fails on Rockchip RK3588 based boards like Radxa CM5. Tested on Radxa CM5 IO Board with OV9281 camera module. Signed-off-by: Iurii Sintiaev <sintjuri@yandex.ru>
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Problem
The OV9281 camera sensor driver fails to work on Rockchip RK3588-based
boards (like Radxa CM5 IO) because async subdev matching never completes.
The Rockchip CSI2 DPHY driver registers an async notifier waiting for
the sensor's endpoint fwnode, but the ov9281 driver was registering
with its device fwnode via
v4l2_async_register_subdev_sensor().This mismatch causes the DPHY to wait forever for the sensor, resulting in:
Solution
Set
sd->fwnodeto the sensor's endpoint fwnode before registration,and use
v4l2_async_register_subdev()instead of the_sensorvariant.Testing
Tested on:
After this fix:
Media topology after fix
m00_b_ov9281 7-0060 → rockchip-csi2-dphy1 → rockchip-mipi-csi2 → stream_cif_mipi_id0