Maxime Ripard 277b51a1d7
drm/vc4: crtc: Assign output to channel automatically ...
The HVS found in the BCM2711 has 6 outputs and 3 FIFOs, with each output
being connected to a pixelvalve, and some muxing between the FIFOs and
outputs.
Any output cannot feed from any FIFO though, and they all have a bunch of
constraints.
In order to support this, let's store the possible FIFOs each output can be
assigned to in the vc4_crtc_data, and use that information at atomic_check
time to iterate over all the CRTCs enabled and assign them FIFOs.
The channel assigned is then set in the vc4_crtc_state so that the rest of
the driver can use it.
Signed-off-by: Maxime Ripard <maxime@cerno.tech >
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