Merge tag 'drm-intel-fixes-2020-02-20' of git://anongit.freedesktop.org/drm/drm-intel...

drm/i915 fixes for v5.6-rc3:
- Workaround missing Display Stream Compression (DSC) state readout by
  forcing modeset when its enabled at probe
- Fix EHL port clock voltage level requirements
- Fix queuing retire workers on the virtual engine
- Fix use of partially initialized waiters
- Stop using drm_pci_alloc/drm_pci/free
- Fix rewind of RING_TAIL by forcing a context reload
- Fix locking on resetting ring->head
- Propagate our bug filing URL change to stable kernels

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/87y2sxtsrd.fsf@intel.com