drm/i915: Ensure no conflicts with BIOS when updating Dbuf
TGL BIOS seems to enable both DBuf slices ocasionally, depending how many displays are connected, while i915 according to BSpec was powering on S1 DBuf slice, until a modeset was done. This was causing a brief flash during the boot as we were disabling slice, previously used by BIOS with that. To prevent this, now we are ensuring tht we are enabling _at least_ one slice, but if there are more, let's not power them off. Fixes: ff2cd863 ("drm/i915: Correctly map DBUF slices to pipes") Reviewed-by:Matt Roper <matthew.d.roper@intel.com> Signed-off-by:
Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> Signed-off-by:
Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200213140412.32697-2-stanislav.lisovskiy@intel.com
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