[PATCH 3/5] drm: bridge: Propagate the bus flags from bridge->timings

[Tomi Valkeinen]

Hi Boris,

On 30/10/2020 10:08, Boris Brezillon wrote:
> The "propagate output flags" and soon to be added "use
> timing->input_flags if present" logic should only be used as a fallback
> for bridges that do not support dynamic bus format/flags negotiation
> IMHO. Ideally we'd want to convert all bridges to do this dynamic bus
> format/flags negotiation and get rid of timings->input_bus_flags once
> this is done, but that's likely to take time. So, if your driver
> implements the ->atomic_check() hook and needs specific input flags,
> I'd recommend setting the input flags there instead of specifying it
> through timings->input_bus_flags.

What is bus flags negotiation? Don't we have negotiation only for bus formats? Bus flags are just
set, and the previous bridge in the chain has to use those flags.

Or do you just refer to setting the bus flags dynamically in atomic_check, versus static in
input_bus_flags?

 Tomi

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