OMAPDSS: Fix crash with DT boot

When booting with DT, there's a crash when omapfb is probed. This is
caused by the fact that omapdss+DT is not yet supported, and thus
omapdss is not probed at all. On the other hand, omapfb is always
probed. When omapfb tries to use omapdss, there's a NULL pointer
dereference crash. The same error should most likely happen with omapdrm
and omap_vout also.

To fix this, add an "initialized" state to omapdss. When omapdss has
been probed, it's marked as initialized. omapfb, omapdrm and omap_vout
check this state when they are probed to see that omapdss is actually
there.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/media/platform/omap/omap_vout.c b/drivers/media/platform/omap/omap_vout.c
index 96c4a17e4280..0a489bd29d6b 100644
--- a/drivers/media/platform/omap/omap_vout.c
+++ b/drivers/media/platform/omap/omap_vout.c
@@ -2144,6 +2144,9 @@ static int __init omap_vout_probe(struct platform_device *pdev)
         struct omap_dss_device *def_display;
         struct omap2video_device *vid_dev = NULL;
 
+        if (omapdss_is_initialized() == false)
+                return -EPROBE_DEFER;
+
         ret = omapdss_compat_init();
         if (ret) {
                 dev_err(&pdev->dev, "failed to init dss\n");