[RFC PATCH 1/1] drm/exynos: Move platform drivers registration to module init

[Kevin Hilman]

Javier Martinez Canillas <javier.martinez at collabora.co.uk> writes:

> The Exynos DRM driver register its sub-devices platform drivers in
> the probe function but after commit 43c0767 ("of/platform: Move
> platform devices under /sys/devices/platform"), this is causing
> a deadlock in __driver_attach(). Fix this by moving the platform
> drivers registration to exynos_drm_init().
>
> Suggested-by: Andrzej Hajda <a.hajda at samsung.com>
> Signed-off-by: Javier Martinez Canillas <javier.martinez at collabora.co.uk>
> ---
>
> This issue was reported by both Krzysztof Kozlowski [0] and Kevin Hilman [1].
>
> Inki Dae said that he will fix it property by separating the Exynos DRM
> driver in different sub-modules but I post this patch as RFC anyways so
> others can test if this fixes their boot issue.

It fixes the DRM deadlock, issue for me on exynos5800-peach-pi, but then
it proceeds to panic in the workqueue code called by the asoc max98090
codec[1].

If I then disable CONFIG_SND_SOC_SNOW, I can get it to boot to a shell,
but I still don't have display output.

Is anyone at Samsung testing linux-next?  If so, on what platforms?  It
would really be nice if your linux-next work was tested on these
publically-available 542x/5800 platforms (peach-pi, peach-pit,
odroid-xu3) which would also allow lots of others to help you test and
validate.

Kevin