[PATCH] imx-drm: fix hdmi hotplug detection initial state

Tim Harvey tharvey at gateworks.com
Thu Apr 24 15:57:27 PDT 2014

On Thu, Apr 24, 2014 at 3:07 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Thu, Apr 24, 2014 at 02:00:49PM -0700, Tim Harvey wrote:
>> I'm still seeing issues with HDMI detect on powerup, at least on my
>> Gateworks Ventana boards (which have no voltage devider or anything
>> else on the HPD line to the IMX6 other than a TVS). I'm currently
>> using your latest imx-drm-staging branch and have applied this patch
>> on top of it. When I enable debug in imx-hdmi.c I see the following:
> So it's a similar setup to the Cubox-i.
> which is only with imx-hdmi bound, no ldb.  The difference you will
> notice is that there's the "Console: switching ..." line, which is
> there because I have fbcon enabled.
> Therefore, I suspect that it is working as it should - if you enable
> fbcon, it should automatically initialise.  If you don't have fbcon
> enabled, then it'll probably wait for a userspace DRM driver to bring
> it up.


Yes, your correct. If I enable fbcon it comes up at boot. But what if
I don't want fbcon? I have CONFIG_LOGO=y and I would expect that to
come up without needing to hotswap. Something must still be missing
that is getting taken care of by fbcon.



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