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

Michel Dänzer michel at daenzer.net
Wed May 24 01:09:00 UTC 2017

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

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