[PATCH 1/2 v2] drm/pl111: Support the Versatile Express

[Robin Murphy]

On 17/04/18 20:31, Linus Walleij wrote:
> On Tue, Apr 17, 2018 at 3:12 PM, Robin Murphy <robin.murphy at arm.com> wrote:
>> On 17/04/18 13:32, Linus Walleij wrote:
>> [...]
>>>
>>> Unfortunately there is just one single vexpress core tile in the
>>> upstream kernel that define a CLCD controller, the CA9 (4xA9)
>>> that I am using. All the others just use the MB CLCD.
>>>
>>> I am thinking there is some never finished DTS upstreaming
>>> here that ought to happen so we use the core tile CLCD on some
>>> other boards as well.
>>
>>
>> Barring custom FPGA images, I think V2P-CA9 *is* the only VExpress tile
>> implementing PL11x; all the more recent test chips had HDLCD instead.
> 
> Yup it looks like that.
> 
> I am restructuring the code to look for any graphics on the
> core tile and only turn on the motherboard CLCD if there is
> no CLCD or HDLCD on the core tile, e.g. if that device node has
> been set to "disabled" or the HDLCD driver is not compiled in
> but the CLCD driver is.
> 
> I found some vague mentions of a LCD display that can be
> connected to the motherboard, so that would then be sitting
> on the CLCD, is this something you ARM guys have seen
> around? In that case I guess the VExpress (etc) would actually
> be able to have two screens, one LCD panel on the motherboard
> CLCD and a DVI from the core tile.

I don't see anything in the V2M motherboard manual to suggest the IOFPGA 
CLCD output is routed anywhere other than the DVI mux, and there are 
certainly no unaccounted-for connectors on the VExpress version 
currently in front of me (HBI-0190D). The only things I'm immediately 
aware of having a panel connector directly on the board are 
Integrator/CP and RealView EB.

Robin.