[Intel-gfx] [PATCH 01/10] drm: Initialize a linear gamma table by default

[Maarten Lankhorst]

Op 31-05-16 om 15:24 schreef Daniel Vetter:
> On Tue, May 31, 2016 at 03:05:32PM +0200, Maarten Lankhorst wrote:
>> Op 30-03-16 om 11:51 schreef Daniel Vetter:
>>> Code stolen from gma500.
>> It would be useful to mention why this is done. :)
>>
>> But even with this patch it seems the legacy gamma in gamma_get is not very reliable.
>> A failed call to gamma_set could leave wrong values in crtc->gamma_store either by calling the ioctl with lut.blue set to NULL, or call gamma_set and interrupt with a signal.
>> For atomic color management get_gamma won't be accurate at all if mixed with new color management.
> Hm, it's just some safety code I found laying around, and figured that
> looks like a good idea. You think it's worth it with some improved commit
> message added?
Might as well. It makes gamma_get ioctl slightly more reliable, but for reliable gamma should probably use crtc properties or atomic. :)