imx-drm hang issue with etnaviv (GC3000)

[Lucas Stach]

Am Freitag, den 28.10.2016, 10:18 +0200 schrieb Lucas Stach:
> Am Donnerstag, den 27.10.2016, 19:26 +0200 schrieb Wladimir J. van der
> Laan:
> > Hello,
> > 
> > After running kmscube (or another KMS executable) on a i.MX6 QuadPlus (etnaviv,
> > GC3000) a few times on I get the below crash in the drm kernel driver.
> > This is on a device with LVDS panel. It is always reproducible, although the
> > number of invocations needed differs.
> > 
> > The only way to get rendering to work again after the crash is to reboot.
> > Repeated tries only get the "flip_done timed out".
> > 
> > This always happens while the program is exiting.
> > 
> > Versions:
> > 
> > - mesa: https://github.com/etnaviv/mesa 9a09984
> > 
> > - libdrm: https://cgit.freedesktop.org/mesa/drm/ fe4579e
> > 
> > - Kernel: 4.8.0 or 4.8.4 + Pengutronix patches (20161007).
> > 
> > Does anyone have an idea what could be the problem?
> > 
> I think I've seen this problem a few times already. I'll have a look at
> this today.

And it had to wait a bit, but I was finally able to track down what's
wrong here.

You want patch "[PATCH 1/2] drm/imx: disable planes before DC" to get
rid of this issue.

Regards,
Lucas