Merge tag 'drm-intel-fixes-2021-01-28' of git://anongit.freedesktop.org/drm/drm-intel...

drm/i915 fixes for v5.11-rc6:
- Fix ICL MG PHY vswing
- Fix subplatform handling
- Fix selftest memleak
- Clear CACHE_MODE prior to clearing residuals
- Always flush the active worker before returning from the wait
- Always try to reserve GGTT address 0x0

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/87y2gdi3mp.fsf@intel.com