[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 13:44:54 UTC 2018

On 04/06/2018 09:34 AM, Michel Dänzer wrote:
> On 2018-04-06 02:39 PM, Andrey Grodzovsky wrote:
>>> 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.
> How about reading DCE registers?

I can try and consult with DAL on this.

>> 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.
> Sure, I don't think anybody's concerned about that. My concerns are:
> * In the cases where we still only reserve 256K, there will likely still
>    be artifacts during driver initialization.
> * 32M might still not be enough in some cases, e.g. 5K / 8K displays.

I see your point, as I said above, will again try to find out if there 
is still a way to know the BIOS FB size.


> P.S. Please don't top-post.

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