Question about sRGB framebuffer support

[Artem Mygaiev]

Hi Sam

On Tue, May 5, 2020 at 10:03 PM Sam Ravnborg <sam at ravnborg.org> wrote:
>
> Hi Artem.
>
> On Tue, May 05, 2020 at 01:24:16PM +0300, Artem Mygaiev wrote:
> > Hello all
> >
> > I am currently working on DRM/KMS driver for Fresco Logic FL2000 USB display
> > controller [1]. I have already implemented a POC driver [2] which is working for
> > me, although there are still plenty of things to improve or fix, of course.
> >
> > So far I have one thing that I somehow cannot find in DRM/KMS documentation or
> > existing drivers: how to tell the system that HW expects sRGB (i.e. non-linear)
> > color encoding in framebuffers? This is a HW limitation that I cannot influence
> > by configuration.
> >
> > Any pointers are greatly appreciated.
> No clue, I hope others can help you.
>

Meanwhile I have implemented conversion to rgb565 in driver, HW seem
to handle it correctly.

> >
> > [1] www.frescologic.com/product/single/fl2000
>
> > [2] https://github.com/klogg/fl2000_drm
> I just visited your github site - and noticed you are using the
> it66121 bridge.
>
> Phong LE <ple at baylibre.com> have recently submitted a patch to
> add this bridge to the kernel:
> https://lore.kernel.org/dri-devel/20200311125135.30832-1-ple@baylibre.com/

Thanks for the pointer, the code looks familiar :)

@Phong, feel free to add me to reviewers, I'll also test it with fl2k later on.

>
> I did not really looks at your code, awaits that you feel ready to submit
> it.
>         Sam

Best regards,
Artem Mygaiev