Hi Fabio,

thank you for the heads-up! I asked Richard Leitner yesterday as he said he has 
a system working with 5.4.y and thankfully he provided some relevant entries 
from their devicetree. So I will look into it (and most likely also get into 
contact with the relevant people as per your suggestion) once I finish my 
current task.

Thank you again for your help!

Cheers,
 Stefan

-----Ursprüngliche Nachricht-----
Von: Fabio Estevam [mailto:[email protected]] 
Gesendet: Dienstag, 17. Dezember 2019 12:09
An: Stefan Birkholz <[email protected]>
Cc: Clay Montgomery <[email protected]>; 
[email protected]
Betreff: Re: [meta-freescale] How to get an fb device with Sumo on i.MX6?

Hi Stefan,

On Tue, Dec 17, 2019 at 7:44 AM Stefan Birkholz <[email protected]> wrote:

> [    2.847793] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> [    2.854549] [drm] No driver support for vblank timestamp query.
> [    2.910683] imx-drm display-subsystem: bound imx-ipuv3-crtc.2 (ops 
> imx_drm_exit [imxdrm])
> [    2.939490] imx-drm display-subsystem: bound imx-ipuv3-crtc.3 (ops 
> imx_drm_exit [imxdrm])
> [    2.950857] imx-drm display-subsystem: failed to bind disp0 (ops 
> imx_pd_ops [parallel_display]): -517
> [    2.964169] imx-drm display-subsystem: master bind failed: -517

-517 is -EPROBE_DEFER. We need to understand which resource is causing this 
problem.

> In the devicetree I use "fsl,imx-display-subsystem", 
> "fsl,imx-parallel-display" and "panel-lvds" as drivers for our display; these 
> settings work (without problems) on 4.19 and up to 5.0.21, but starting from 
> 5.1.0 I get the error above.

I would suggest to report such regression to the lists and folks listed by 
./scripts/get_maintainer.pl -f drivers/gpu/drm/imx/

Sharing your device tree would also help in the report.

Regards,

Fabio Estevam
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