Without the user IRQ running constantly, there's no wakeup when the ring
empties to go retire requests and free buffers. Use a 1 second timer to make
that happen more often.
Instead of throttling and execbuffer time, have the application ask to
throttle explicitly. This allows the throttle to happen less often, and
without holding the DRM lock.
The code was discarding the dri_bo_gem structure and saving only the kernel
handle. This lost the mmap address, causing pain when the next buffer user
wanted to map the buffer.
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
Without kernel modesetting, this requires cooperation of the userspace
modesetting driver. We may have to leave the vblank interrupt enabled otherwise
to avoid problems.
Only compensate when the driver counter actually appears to have moved
backwards.
The compensation deltas need to be incremental instead of absolute; drop the
vblank_offset field and just use atomic_sub().
Turns out the radeon driver is affected by the same problem that prompted i915
to revert to less useful counter flipping at the end of the vblank interval. In
the long term, we can hopefully implement more reliable methods to achieve
counter flipping at the beginning of vblank, but otherwise this should be an
acceptable workaround.
Keith Packard
Dave Airlie
Jesse Barnes
Dennis Kasprzyk
Eric Anholt
Dave Airlie
Michel Dänzer