Re: [PATCH 6/6] ARM: dts: omap4-droid4: Add LCD

[Sebastian Reichel <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>]

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Hi,

On Sun, Mar 19, 2017 at 09:10:30AM -0700, Tony Lindgren wrote:
> * Sebastian Reichel <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> [170318 18:31]:
> > Hi,
> > 
> > On Sat, Mar 04, 2017 at 09:43:59PM -0800, Tony Lindgren wrote:
> > > The LCD panel on droid 4 is a command mode LCD. The binding follows
> > > the standard omapdrm binding and the changes needed for omapdrm command
> > > mode panels are posted separately.
> > > 
> > > Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> > > Cc: Marcel Partap <mpartap-hi6Y0CQ0nG0@public.gmane.org>
> > > Cc: Michael Scott <michael.scott-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
> > > Cc: Sebastian Reichel <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> > > Cc: Tomi Valkeinen <tomi.valkeinen-l0cyMroinI0@public.gmane.org>
> > > Signed-off-by: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
> > 
> > Tested-By: Sebastian Reichel <sre-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
> > 
> > With a non-modular kernel lcd is not working with omapdrm if HDMI
> > is enabled. After dropping HDMI in droid4's dts file everything
> > worked as expected. I assume both work properly with a modular
> > kernel?
> 
> Yes with loadable modules both work just fine. If things do not
> work properly as built-in, chances are there's some unhandled
> dependency that needs -EPROBE_DEFER somewhere for a regulator
> or a clock.

I think that would also result in problems with disabled HDMI.
I guess the problem is, that omapdrm is initialized too early.
AFAIK omapdrm is not hotplug-capable.

-- Sebastian

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