DRM_MODE_CONNECTOR_PANEL? [Was: drm/panel: Add and fill drm_panel type field]

Daniel Vetter daniel at ffwll.ch
Tue Oct 8 08:42:45 UTC 2019


On Fri, Sep 27, 2019 at 05:28:03PM +0300, Tomi Valkeinen wrote:
> On 27/09/2019 15:44, Daniel Stone wrote:
> > Hi Linus,
> > 
> > On Fri, 27 Sep 2019 at 13:37, Linus Walleij <linus.walleij at linaro.org> wrote:
> > > Also the ILI9322 can actually set up gamma correction which is
> > > very nice for professional applications. I haven't seen any way for
> > > DRM to do gamma correction properly or any framework for it
> > > to adjust and propagate gamma to/from userspace (seems like
> > > another enormous task), but I am pretty sure it will be there one
> > > of these days so I put in some comments and placeholders.
> > 
> > Gamma correction has been supported since approximately the dawn of
> > time with a 3x8-bit LUT.
> 
> But, afaik, only in the display controller side. I don't think we have means
> to have any properties for the panels or bridges.

I guess would need some semi-elaborate negotiation dance to make sure you
only correct in either the bridge/panel or in the crtc, but should be
doable. I don't think we need a new property or change anything with the
uapi here, just kernel internals.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch


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