Normally when X is running, panic messages will be invisible and the machine
will just appear to hard hang. This patch adds support for switching back to
the fbcon framebuffer on panic (through the use of a panic notifier
registration) so we can see what happened.
Note that in order to be really useful, X will have to run its VT in something
other than KD_GRAPHICS mode. Also, not all kernel errors result in panics,
some go through BUG() which may trigger another type of event, not resulting in
a switch.
Port over EDID quirks from X.Org so we can handle more monitors. This meant
adding size info to the drm_display_mode struct, but other than that the
changes were isolated to the DRM EDID handling code (as they should be).
A check in drm_sysfs_connector_remove was supposed to allow it to be called
even with unregistered objects, to make cleanup paths a little simpler.
However, device_is_regsitered didn't always seem to return what we thought it
would, so we'd sometimes end up leaving objects lying around rather than
unregistering them.
Fix this situation up by requiring devices to be registered before being
removed. Any problems resulting from this change should be easier to track
down than the alternative (which is leaving kobjects registered after unload).
We need to initialize the edid_blob_ptr to NULL when we init a connector,
otherwise drm_mode_connector_update_edid_property may think there's a valid
EDID lying around and try to destroy it, causing a crash.
Idea being if you want to add new crtc/output/encoder dynamically later,
you just increase the generation counter and userspace should re-read
all the resources
This creates a default group attached to the legacy drm minor nodes.
It covers all the objects in the set. make set resources only return
objects for this set. Need to fix up other functions to only work on
objects in their allowed set.
Maarten Maathuis
Jesse Barnes
Dave Airlie
Dave Airlie
Alan Hourihane