[PATCH v3 45/50] drm/omap: dpi: Register a drm_bridge

[Tomi Valkeinen]

On 19/12/2019 11:40, Laurent Pinchart wrote:

>> Do we ever get drm_bridge_funcs calls from multiple threads at the
>> same time? Is there a difference between having a single DPI output,
>> or multiple DPI outputs (i.e. can two different DPI outputs get calls
>> simultaneously?).
> 
> I'll drop the lock, it's not needed. The core should serialize calls to
> the bridge, at least per output. For different outputs, there's a
> possibility I believe of atomic commits being handled concurrently if
> they don't share any resource.

I don't think we do much locking with resource handling. E.g. we have single registers with mux 
settings for multiple outputs. If DPI (or any other dss output) gets called concurrently for 
different outputs, we might get a race.

I wonder if that concurrency is opt-in...

  Tomi

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