[PATCH v3] drm/plane: Add documentation about software color conversion.

[Maxime Ripard]

On Fri, Sep 08, 2023 at 05:37:27PM +0200, Thomas Zimmermann wrote:
> > > Please note that the kernel's conversion code uses memory allocation
> > > of intermediate buffers. We even recently had a discussion about
> > > allocation overhead during display updates. Userspace can surely do
> > > a better job at keeping such buffers around.
> > > 
> > > And finally a note the hardware itself: on low-end hardware like
> > > those Matrox chips, just switch to RGB16. That will be pretty and
> > > fast enough for these chips' server systems. Anyone who cares about
> > > fast and beautiful should buy a real graphics card.
> > 
> > There are still sysadmin users that occasionally have to browse the web
> > to find answer, or read their mail in a GUI client. It turns out that
> > rgb16 is pretty ugly for today standard, and buying an external card
> > would be a bit too much, and won't work for remote control.
> 
> I'm sure sysadmins have a computer for work with a decent GPU and don't need
> to browse the web on their server systems.

If your expectation is that there's no capable display stack running on
those systems, what user-space component would you expect to optimize
the format/transfers like you previously hinted at exactly?

Maxime
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