On Thu, Aug 29, 2013 at 7:34 PM, Greg Hackmann <ghackmann@xxxxxxxxxx> wrote:
> On Thu, Aug 29, 2013 at 5:54 AM, Rob Clark <robdclark@xxxxxxxxx> wrote:
>>
>> I guess if you have multiple encoders + multiple connectors for the
>> "ganging" case, then it probably just looks like 2x displays, and
>> nothing more really needed?
>>
>> I'm a bit fuzzy on what the hw looks like in this "ganging" scenario,
>> so I'm not completely sure what the best approach is. But if we do
>> have hw like this, then it makes sense to support it *somehow* in KMS.
>
>
> I don't have the hardware anymore so this is all working from memory, it
> didn't look like two independent displays. You had to explicitly set up
> connections between the two mixers to deal with things like scaled overlays
> that spanned both mixers (there was some in-hardware magic to make sure
> there wasn't a visible seam where the two mixers met).
Ok, sounds like mixer == crtc (ie. the thing the combines one or more
planes)? So it sounds maybe a bit like:
plane0_0 -\
... +---> CRTC -\
plane0_n -/ |
+--> encoder -> connector
plane1_0 -\ |
... +---> CRTC -/
plane1_n -/
?
BR,
-R
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