On 15/04/14 20:36, Joachim Eastwood wrote:
> Hello,
> 
> I am trying to get HDMI work with DT on my VAR-STK-OM44 (4460) board.
> But during kernel boot I get the following message:
> 
> [ 0.953796] ------------[ cut here ]------------
> [ 0.953826] WARNING: CPU: 0 PID: 1 at
> drivers/video/omap2/dss/dss.c:483 dss_set_fck_rate+0x7c/0x8c()
> [ 0.953826] clk rate mismatch: 153600000 != 170666666

I have a fix (attached) for this in fbdev-fixes, which I'll probably be
sending to Linus today. I couldn't send it in the main fbdev pull
request, as it depended on clk driver changes. And it's not fatal, most
likely things work fine even with the warning.

> [ 0.954345] OMAP DSS rev 4.0
> [ 0.956970] connector-hdmi connector.10: failed to find video source
> [ 0.957031] connector-hdmi: probe of connector.10 failed with error -22
> [ 0.959167] omapfb omapfb: no displays
> [ 0.961547] omapfb omapfb: failed to setup omapfb
> [ 0.961578] platform omapfb: Driver omapfb requests probe deferral

Your DT data is not right. The shorter endpoint format you use is not
supported. Have a look at arch/arm/boot/dts/omap4-panda-common.dtsi for
an example.

Also the HDMI driver does not currently work if the OMAP HDMI is
directly connected to the HDMI connector. Panda and 4430 SDP boards use
TPD12S015 chip in between. This should be fixed in the future, but at
the moment you'll see problems if your board does not have that chip.

 Tomi