[PATCH 1/2] drm/amdgpu/gmc: always steal the first 32MB of vram for fw hand-over

Andrey Grodzovsky Andrey.Grodzovsky at amd.com
Fri Apr 6 11:23:20 UTC 2018


Me and Alex talked to a BIOS guys yesterday exactly about that, a 
dynamic way to query this info from BIOS, he just told us to reserve 32M 
to cover 4K display.

Andrey


On 04/06/2018 04:30 AM, Christian K├Ânig wrote:
>> I wonder if there's no way to determine which part of VRAM is being
>> scanned out. If there was, we could just create a normal BO covering
>> that, which would get destroyed once no CRTC references it anymore.
>
> Unfortunately it goes further than that. The stolen VRAM is needed for 
> VGA emulation, not only for scanout.
>
> But yes I agree that we somehow figure that value out from the BIOS. 
> If I'm not completely mistaken I've also seen some atombios table with 
> that info in some discussion.
>
> Christian. 

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