Re: Rockchip RK3328 Rock64 HDMI

On Wed, 25 Sep 2024 17:29:11 +0200
Klaus Küchemann <maciphone2@googlemail.com> wrote:

> Well, ? estimation ...,
> To say it in short:
> While RK3399 HDMI even worked with fbsd-efifb on an old installation on my Rock960(which is the same gpu as the RockPro64) ,
> this will not happen for the RK3328/ Rock64.
> 
> In longer but simple  words :
> Needed 5 minutes to hack u-boot`s current version  to get HDMI - output on the RK3328/ Rock64..

 What's the hack ?

> It works because u-boot(and linux) has built in driver for the hdmi-inno phy.
> So the dts devicetree- entries for the hdmi_phy point to that driver ( which is glued in their drm).
> So u-boot sets up it?s framebuffer based on this driver while it cannot be handed over to FreeBSD 
> because it`s not implemented FreeBSD (as Manu said) .

 That's not what I said, if u-boot setup a GOP interface FreeBSD loader
and kernel will be able to use it.

> So from u-boot`s framebuffer(or whatever hdmi-output) the screen turns back to dark black exactly in the moment of the 
> handover to fbsd kernel,  no automatically efifb.
>  I don`t assume that a dedicated developer will port/write the necessary hdmi-drivers 
> for the outdated RK3328/Rock64 because (e.g in this thread) currently exactly 1 person(not me) is known to need the glass console for that Soc...but you never know?.
> 
> 
> 
> > Am 21.09.2024 um 19:36 schrieb Emmanuel Vadot <manu@bidouilliste.com>:
> > 
> > On Sat, 21 Sep 2024 15:49:51 +0200
> > Klaus Küchemann <maciphone2@googlemail.com> wrote:
> > 
> >> Hi Manu,
> >> 
> >> thanks for letting me know. It`s the first time I looked deeper into this issue.
> >> So you mean that adding RK3328 codes to your DRM-subtree is even necessary 
> >> to get efifb console output ?
> 
> > No, efifb will automagically works if u-boot setup the display (which
> > it should and did iirc but it's been a while)
> > 
> >> The current state of (at least my) Rock64 is a complete HDMI blank screen without any electrical reaction at boot .
> >> Can`t find any specific  Rockchip frame buffer code at first view, so for now I`m a bit confused where to start 
> >> to get any HDMI-output.u-boot or firmware or your drm-subtree, or is there a specific Rockchip bug somewhere??? 
> > 
> > As said above for efifb u-boot needs to setup hdmi etc ... If it's not
> > done right now maybe some config is needed.
> > drm-subtree is needed if one wants 2D accel (but needs code), for 3D we
> > will need lima ported as this GPU isn't supported by panfrost iirc.
> 
> 


-- 
Emmanuel Vadot <manu@bidouilliste.com> <manu@freebsd.org>