RK3399 DisplaPort no 4K resolution

Markie

Dear all,

additional info below (edit 2018-04-04)

I too try to get a DisplayPort 4K monitor  (AOC U2879VF) working, however no success yet.
I have modified the DTS-file accordingly, and I see a couple of things:

1) 'dumpsys SurfaceFlinger' shows 2 displays: "Built-in screen" and "HDMI screen". The latter is the the DisplayPort 4K monitor. The naming is hardcoded in the Android source, and reading the EDID shows it is the correct monitor (and I have no display connected via HDMI). Only one monitor via HDMI shows only "Built-in screen". I don't think this is an issue, as Android tries to clone to each video output.

2) I guess the VOP_LITTLE seems to be selected for DisplayPort output (and not the VOP_BIG), as the current mode is 2560x1440@60p and the modes list does not contain above this (also not 3840x2160p60), while the monitor is capable.

1. $cat /sys/devices/platform/display-subsystem/drm/card0/card0-DP-1/modes
   
2. 2560x1440p60
   
3. 1920x1080p60
   
4. 1920x1080p60
   
5. 1920x1080p60
   
6. ...
   

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3) Although the monitor should accept 2560x1440@60p, there is no image on the monitor and I get the following dmesg/console-output when connecting the monitor:

1. [   13.220928] fusb302 4-0022: attention, dp_status a
   
2. [   13.227559] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected without sink. Assert hpd
   
3. [   13.287002] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected, not enabled. Enabling cdn
   
4. [   14.239036] fusb302 4-0022: attention, dp_status 8a
   
5. [   14.241816] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
   
6. [   57.438951] fusb302 4-0022: attention, dp_status 18a
   
7. [   57.444952] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
   
8. [   69.396299] fusb302 4-0022: attention, dp_status 18a
   
9. [   69.402256] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
   
10. [   71.460755] fusb302 4-0022: attention, dp_status 18a
    
11. [   71.467507] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
    
12. [   72.984966] fusb302 4-0022: attention, dp_status 18a
    
13. [   72.992195] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
    
14. [   96.583813] fusb302 4-0022: attention, dp_status a
    
15. [   96.591843] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
    
16. [   97.572369] fusb302 4-0022: attention, dp_status 8a
    
17. [   97.579922] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
    
18. [  138.177425] fusb302 4-0022: attention, dp_status 18a
    
19. [  138.185544] cdn-dp fec00000.dp: [drm:cdn_dp_pd_event_work] Connected with sink. Re-train link
    

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Resulting in some questions:
1) How can I verify which VOP is "used" for which display?
2) How to make sure VOP_BIG is "used"?
3) Do you have any information about this "dp_status 18a"? Maybe to suspect the monitor ...

additional info: I see a difference between boards, as I have boards with different production dates/stickers
- one board with production date 2017-08-22: see above observations
- one board with production date 2018-03-29: works out of the box! (although only 2560x1440@60p, and not yet 3840x2160@60p)
I don't know whether there is a hardware change, or it is subject to hardware component variations, ...

Thanks in advance,
With kind regards, Mark

iltis-wiesel

Dear Team-Firefly,
we still need the 4k@60Hz DP output.

Can you please provide a firmware image which makes the board work as advertised?

Thanks!
BR
fl0wtec

leung先森

iltis-wiesel Posted at 4/27/2018 15:09
Dear Team-Firefly,
we still need the 4k@60Hz DP output.

modif code like #6 said .
If cannot up to the 4K but better than 1080p, it might be speed limited by cable.

RakeshDesai

Hi fl0wtec,

Did you ever manage to resolve the USBC(DP) VGA screen resolution list issue?