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

Hi,

On Sun, Mar 19, 2017 at 09:10:30AM -0700, Tony Lindgren wrote:

* Sebastian Reichel [off-list ref] [170318 18:31]:

quoted

Hi,

On Sat, Mar 04, 2017 at 09:43:59PM -0800, Tony Lindgren wrote:

quoted

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 <redacted>
Cc: Michael Scott <redacted>
Cc: Sebastian Reichel <redacted>
Cc: Tomi Valkeinen <redacted>
Signed-off-by: Tony Lindgren <redacted>

Tested-By: Sebastian Reichel <redacted>

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