Re: rk3399: Graphical artifacts when running for-next

Heiko Stuebner
2019-02-21T13:26:35Z

Hi Robert,

Am Donnerstag, 21. Februar 2019, 11:27:15 CET schrieb Robert Foss:
> Hey Heiko,
>
> I've just started booting the RK3399 based Radxa Rock Pi 4 on the mainline
> kernel. Specifically on linux-rockchip/for-next, with an additional patch
> adding the GPU DT node[1].
>
> Unfortunately I'm seeing an artifact on all display output[2].
> It, from the VT to 3D content.
>
> Is this an issue that has been encountered before?

I haven't seen something like this before. I do test graphics
on most Rockchip socs regularly (right now dw-hdmi only
on non-rk3399 socs though).

Did you try full linux-next as well? My for-next branch obviously
only carries dt/soc-driver stuff but not things like drm-misc.

One possible issue might be the generated clocks. You could check
$debug/clk/clk_summary for the dclk_vopX to see if that matches
the suggested clock for the mode. (For example check the requested
rate in rockchip_vop.c against what it actually gets).

Heiko

> [1] https://patchwork.kernel.org/patch/10817637/mbox/
> [2] https://photos.app.goo.gl/ArffJ3785JSeQatW7
>
>
> Rob.
>