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

[Andrey Grodzovsky]

At least the second patch somehow addresses the memory waste concern, 
the reservation will be very transient, during late init the BO will get 
freed.

Andrey


On 04/06/2018 08:26 AM, Christian König wrote:
> I feared that you would say that :(
>
> In this case the patches are Acked-by: Christian König 
> <christian.koenig at amd.com>.
>
> Thanks,
> Christian.
>
> Am 06.04.2018 um 13:23 schrieb Andrey Grodzovsky:
>>
>> 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 König 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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>

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