Messages in this thread | | | Date | Tue, 4 Jul 2017 17:09:02 +0200 | From | Pavel Machek <> | Subject | Re: [BISECTED, REGRESSION] v4.12-rc: omapdrm fails to probe on Nokia N900 |
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Hi!
> >>>> Are you sure it doesn't probe? It fails the omapdss_stack_is_ready() > >>>> check? > >>> > >>> It appears the reason was that I didn't have > >>> CONFIG_DRM_OMAP_CONNECTOR_ANALOG_TV enabled. > >>> > >>> I think that's wrong. I don't own an analog TV, so why should I enable > >>> such option to get device's built-in display working? > >> > >> Indeed. Unfortunately I don't have a solution for that. > >> > >> DRM doesn't support adding devices after probe. So at omapdrm probe time > >> we have to decide which displays to use. In the dts file, n900 defines > >> the lcd and analog tv. omapdrm sees those, and, of course, must wait > >> until their respective drivers have probed. If you don't have the > >> display driver enabled, it's never loaded and omapdrm never probes as it > >> keeps waiting for those. > > > > Could you at least print some kind of message early in the boot ("omapdrm > > is waiting for drivers for display x and y")? > > That could be quite spammy. omapdrm will defer probe if the displays are > not present, and the deferred probing machinery will then cause a new > omapdrm probe later. That can happen a lot of times before the drivers > are there.
Well doing printk just once should not be a problem...? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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