Lucie / minute

hell yeah, got displayport alt mode over usb-c working on rk3588 pocket reform with mainboard 2.0!

in the end it was a DP lane polarity issue: USB3 allows lane polarity swap for better PCB routing, but DP doesn't. tricky when you need to reuse the same lanes for both.

Apr 8 at 10:29pmTusky
Show threadLucie / minute2d ago
but wait... does that mean MNT Pocket Reform can have 3 displays now (1 DP, 1 HDMI, 1 internal)? yes, yes it can!
Show threadAlison Wilder2d ago
@mntmn holy shit, you just keep making this thing COOLER AND COOLER
Show threadjosch2d ago
@alisynthesis @mntmn I feel we need to somehow stuff the pocket reform mainboard into a classic reform case to have the classic reform have feature parity compared to the pocket reform (not just because of display port alt mode over usb-c but also because the pocket has wifi, bluetooth and umts with rk3588...)
Show thread[tj] - knows what your packets are thinking2d ago
@josch @alisynthesis @mntmn imagine the batteries you could get in there with a tiny mainboard!
Show threadjosch2d ago
@tj @alisynthesis @mntmn More seriously I am hoping that we can re-use the Reform Next mainboard in the classic Reform. It already has support for eight LiFePo4 batteries, for the panel and since the left/right port board are separate you could create a port board with full size ethernet for example. :)
Show threadgahlord2d ago
@mntmn Will it drive an Apple XDR? Asking for a friend.
Show threadLucie / minute2d ago
@gahlord unfortunately i don't have one to test with :D
Show threadgahlord2d ago
@mntmn haha if only I had a little MNT I could test it for you. :) Maybe eventually
Show threadLuke Wren2d ago
@mntmn Finally a thumb grabby thing that doesn't look like a MacBook
Show threadLuke Wren2d ago
@mntmn The number of manufacturers doing exactly this feature is too damn high
Show threadLucie / minute2d ago
@wren6991 ahhh now i get it :D yes, deliberate
Show threadTravis F W2d ago
@mntmn @wren6991 but what do you CALL it??
Show threadsiviq2d ago
@mntmn Bare aluminum case looks interesting to me. Any plans to release it as purchase along the mainboard 2.0?
Show threadAlex Seibz2d ago
@mntmn
I love you and I still want this. Maybe by my birthday at the end of the year! Will you be shipping towards the end of December or no?
Show threadIgnas Kiela2d ago
@mntmn no DP MST support?
Show threadLucie / minute2d ago
@ignaloidas no, but i also don't have a display that can do that
Show threadWolf480pl2d ago
@mntmn
USB-C hubs with multiple display outputs usually use MST, maybe one of those would be easier to get than an MST-supporting display?
@ignaloidas
Show threadIgnas Kiela2d ago
@wolf480pl @mntmn yeah, my thoughts on usage are the same

Though it seems like rk3588 can't support MST, while the (lower-end) RK3576 can https://lwn.net/Articles/1031560/
Add support for RK3588 DisplayPort Controller

LWN.net
Show threadLucie / minute2d ago
@ignaloidas @wolf480pl yeah i also remember this as a newer feature. also not sure how useful it would be for 2 lanes
Show threadIgnas Kiela2d ago
@mntmn @wolf480pl how high can they clock? You could drive two 1080p monitors with that if it can go to HBR2
Show threadWolf480pl2d ago

@mntmn
If I'm reading the table here
https://en.wikipedia.org/wiki/DisplayPort#Refresh_frequency_limits_for_common_resolutions
correctly ( it's for 4 lanes so divide fps by 2, then by 60 to see how many monitors fit)

with 2 lanes and HBR3 one should be able to get 2x 1440p60Hz, right?

@ignaloidas

DisplayPort - Wikipedia

Show threadIgnas Kiela2d ago
@wolf480pl @mntmn yeah, and it seems like rk3588 does support HBR3 so it should be able to do it, and that's certainly useful

Also supports DSC if we want to go that route as well
Show threadcrypt172d ago
@mntmn nice work
Show threadshork2d ago
@mntmn lmao that screen looks so big
Show threadjosch2d ago
@mntmn This is awesome! I remember many people having asked for this QoL feature during the last year. Congratulations that you got this working! 🎉
Show threadLucie / minute2d ago
@josch thank uu! and yes, i remember those requests and i also really wanted to get to the level of elegance where you can dock through just 1 cable
Show threadjosch2d ago
@mntmn I am *very* tempted to make my next monitor a display-port monitor given these news. :)
Show threadstdevel2d ago
@mntmn Wow, that’s so cool - great work!
Show threadJonathan Frederickson2d ago
@mntmn Woooooo! :D
Show threadAnton Zadorožnyj2d ago
@mntmn that alone might be the reason for the upgrade. Any plans to sell new MB iteration separately, or will it come with new Pocket orders only?
Show threadLucie / minute2d ago
@dartov will be offered separately as well!
Show threadRobin H. Hansen2d ago
@mntmn yes, yes, yes! I already got a Pocket Reform on order, and I'm excited as hell. This was my only gripe with the machine :D
Show threadshtrophic2d ago
@mntmn finally some good news to wake up to :')
Show threadDaneli2d ago
@mntmn 🎉
Show threadLucas Dohmen2d ago
@mntmn Yesssss 😍
Show threadhanno2d ago

@mntmn
That is great news, congratulations! 🙌

What are the odds this would work with the i.MX8MPlus too?

Show threadLucie / minute2d ago
@hanno that would only be possible with a modified mezzanine (carrier card) for the imx8mplus, because hdmi/dp are on the same lines and are normally routed to hdmi out on the mainboard