RK3399 DisplaPort no 4K resolution

fl0wtec

Hi,

the RK3399 has an USB-C/DP port.

Android reports max. resolution of 1920 x 1200 @ 60 Hz.

How to enable UHD/4K 3849 x 2160 @ 60Hz via DisplayPort on RK3399?

Thanks
fl0wtec

leung先森

Have you try Android7.1.2 ?

fl0wtec

Hi,
can you please post a link where I can get Androi 7.1.2 Firmware image for RK3399?

Google drive only lists 7.1.1:



Thanks
fl0wtec

leung先森

fl0wtec Posted at 3/24/2018 02:17
Hi,
can you please post a link where I can get Androi 7.1.2 Firmware image for RK3399?

http://en.t-firefly.com/doc/download/index/id/3.html

fl0wtec

leung先森 Posted at 3/24/2018 09:09
http://en.t-firefly.com/doc/download/index/id/3.html

Hi,

with Firefly-RK3399_Android7.1.2_MP_180126 image it gets even worse.
Nothing to choose from anymore:




Auto defaults to 1920 x 1080 @60Hz:



Can you please enable DP output with 3840 x 2160@60Hz?

Thanks
BR
fl0wtec

leung先森

fl0wtec Posted at 3/24/2018 16:40
Hi,

with Firefly-RK3399_Android7.1.2_MP_180126 image it gets even worse.

need to modify  dts file and complie your kernel and resource.
make the DP connector support vopb.
patch below

&hdmi_in_vopb {
        status = "okay";
};
&hdmi_in_vopl {
        status = "disabled";
};

&dp_in_vopb {
    status = "okay";
};

&dp_in_vopl {
    status = "okay";
};

joyhub2140

leung先森 Posted at 3/26/2018 09:18
need to modify  dts file and complie your kernel and resource.
make the DP connector support vopb ...

not work

fl0wtec

Dear leung先森,

can you please be more specific and tell us which .dts file exactly needs to be modified?

Can you please provide an image where DP output is enabled with 3840 x 2160@60Hz?

Thanks!
BR
fl0wtec

leung先森

fl0wtec Posted at 3/31/2018 00:56
Dear leung先森,

can you please be more specific and tell us which .dts file exactly needs to be m ...

kernel/arch/arm64/boot/dts/rockchip/rk3399-firefly.dts
complie it and flash resource.img and kernel.img

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. ...
   

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