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RK3399 DisplaPort no 4K resolution

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Posted at 4/3/2018 17:11:51     

RE: RK3399 DisplaPort no 4K resolution

Last edited by Markie In 4/4/2018 14:23 Editor

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. ...
Copy the code
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
Copy the code
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
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Posted at 4/27/2018 15:09:35     
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
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Posted at 5/5/2018 16:45:21     
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.
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Posted at 5/21/2019 21:10:14     
Hi fl0wtec,

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