[CRTC:24] vblank wait timed out

[Philipp Zabel]

On Fri, 2017-03-24 at 10:24 +0000, Martyn Welch wrote:
[...]
> > Could you move to v4.9 or v4.10 and check if the four patches in
> > https://git.pengutronix.de/cgit/pza/linux/tag/?id=v4.9-ipu-dp-plane-fix
> > or
> > https://git.pengutronix.de/cgit/pza/linux/tag/?id=v4.10-ipu-dp-plane-fix-2
> > help?
> > 
> 
> I've updated to v4.10, the patches from v4.10-ipu-dp-plane-fix-2 resolve
> the error, though we are unfortunately still experiencing the loss of
> output on LVDS display. Time to look elsewhere for the cause of that I
> guess. :-)

Is the LVDS serial clock derived from the video PLL on that board?
(What is the output of /sys/kernel/debug/clk/clk_summary?)

If you are driving high resolution displays from the same IPU, this
could also be a bandwidth issue. Maybe try severing the ipu1->hdmi and
ipu2->ldb links in the device tree as done in imx6q-utilite-pro.dts.

regards
Philipp