2014-11-05 17:38 GMT+03:00 Thierry Reding <thierry.reding@xxxxxxxxx>: > On Tue, Nov 04, 2014 at 09:18:46PM +0400, Matwey V. Kornilov wrote: >> Hi, >> >> I run 3.18-rc3 kernel on BeagleBone Black. It doesn't have Exynos DRM >> of course, but I run multi-platform kernel where CONFIG_DRM_EXYNOS is >> set to 'y'. >> The issue here is that the platform probe/init goes to infinite loop >> as the following: >> >> [ 5.717343] platform exynos-drm: Driver exynos-drm requests probe deferral >> [ 5.726848] exynos-drm-ipp exynos-drm-ipp: drm ipp registered successfully. >> [ 5.734700] platform exynos-drm: Driver exynos-drm requests probe deferral >> [ 5.744044] exynos-drm-ipp exynos-drm-ipp: drm ipp registered successfully. >> [ 5.752010] platform exynos-drm: Driver exynos-drm requests probe deferral >> [ 5.761377] exynos-drm-ipp exynos-drm-ipp: drm ipp registered successfully. >> [ 5.769291] platform exynos-drm: Driver exynos-drm requests probe deferral >> >> It is quite unexpectable behavior. I would expect that the exynos-drm >> failed to initialize with 'no device' error. >> >> See also for the reference: https://bugzilla.kernel.org/show_bug.cgi?id=87691 > > The reason for this seems to be that Exynos DRM instantiates a dummy > device that it can bind to (see exynos_drm_init()). Now this code is > executed unconditonally, so the device will be created whether or not > the kernel/module runs on an Exynos SoC. The driver should really bind > to some real device rather than instantiating a dummy. Or if it must > bind to a dummy then the code needs to at least check that it's running > on an Exynos SoC before instantiating the dummy. > > Thierry Could it be fixed somehow? By the way, I am not sure that exynos_drm_match_add behaves correctly. It returns EPROBE_DEFER when there are no matches, but it doesn't check (probably can not check) whether all the probes have been run. -- With best regards, Matwey V. Kornilov http://blog.matwey.name xmpp://0x2207@xxxxxxxxx _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
