[Bug 773473] kmssink: support display mode setting

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773473

--- Comment #50 from Michael Tretter <m.tretter at pengutronix.de> ---
(In reply to Víctor Manuel Jáquez Leal from comment #47)
> Comment on attachment 340774 [details] [review]
> kmssink: add mode setting and base plane rendering
> 
> Sorry for the patch ping pong.
> 
> Since I haven't setup an environment for this use case yet, can you try this
> patch instead of attachment 339326 [details] [review]??
> 
> If I understand correctly, there is no need of gst_kms_page_flip(), just set
> self->buffer_id = fb_id and call gst_kms_sink_sync() -- which knows if
> modesetting is enabled.
> 
> Thanks

The patch works on i.MX6 as well. It makes sense to update self->buffer_id, but
I am not sure about concurrent accesses (if ever possible). It should be fine.

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