Re: Re: [PATCH RESEND v2 06/12] drm/sun4i: rgb: Add 1% tolerance to dclk frequency check when bridge is connected

Vasily Khoruzhick
2019-02-05T17:49:17Z

On Tue, Feb 5, 2019 at 7:42 AM Maxime Ripard <maxime.ripard-LDxbnhwyfcJBDgjK7y7TUQ@public.gmane.org> wrote:
>
> On Mon, Feb 04, 2019 at 10:50:17AM -0800, Vasily Khoruzhick wrote:
> > On Mon, Feb 4, 2019 at 8:29 AM Icenowy Zheng <icenowy-h8G6r0blFSE@public.gmane.org> wrote:
> > > >> IIRC, from the previous discussion, HDMI had a tolerancy requirement
> > > >> in the standard. Do you know if there's such a thing for eDP? That
> > > >> would solve the issue for all the eDP displays at once.
> > > >
> > > >I don't have access to eDP standard - vesa.org says it's available to
> > > >members only.
> > >
> > > Try out to grab an old version?
> > >
> > > I remember 1.0 is open.
> >
> > I can't find anything regarding dot clock tolerance in DisplayPort
> > specification.
>
> I guess since the DP is a VESA spec, it's probably .5%, just like on
> the EDID (well, CVT).

Unfortunately that's not enough for Pinebook. It needs 1% for 768p panel.

>
> Maxime
>
> --
> Maxime Ripard, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com