Merge tag 'drm-intel-fixes-2021-12-02' of git://anongit.freedesktop.org/drm/drm-intel...

Merge tag 'drm-intel-fixes-2021-12-02' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

- Fixing a regression where the backlight brightness control stopped working.

- Fix the Intel HDR backlight support detection.

- Reverting a w/a to fix a gpu Hang in TGL. The w/a itself was also
for a hang, but in a much rarer scenario. The proper solution need
to be done with help from user space and it will be addressed later.

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/Yakf9hdnR5or+zNP@intel.com