[PATCH] drm/amd/display: Limit DCN to x86 arch

[Michel Dänzer]

On 23/05/17 10:37 PM, Harry Wentland wrote:
> On 2017-05-20 04:13 AM, Christian König wrote:
>> Am 19.05.2017 um 22:28 schrieb Harry Wentland:
>>> 
>>> I realize this is raising a lot of concern. I was concerned myself
>>> when I first saw this. Beside calling kernel_fpu_begin() and
>>> kernel_fpu_end() are there other things to watch out for?
>>
>> Yeah, especially setting "-msse" is rather questionable. As far as I
>> know on 64bit systems it is the default, but on 32bit systems that
>> could silently break some assumptions.
>>
>> Additional to that as far as I know "-msse" is just for optimization
>> and that isn't performance critical code, so why exactly do we need it?
> 
> Once we enable multi-plane code this code becomes performance critical
> as I believe it gets executed when resizing an underlay surface, such as
> a video player.

That should still only happen once per frame though, i.e. on the order
of 10s to 100s of times per second.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer