drm/i915: Populate pipe dbuf slices more accurately during readout
During readout we cannot assume the planes are actually using the slices they are supposed to use. The BIOS may have misprogrammed things and put the planes onto the wrong dbuf slices. So let's do the readout more carefully to make sure we really know which dbuf slices are actually in use by the pipe at the time. Cc: <stable@vger.kernel.org> # v5.14+ Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220204141818.1900-2-ville.syrjala@linux.intel.comReviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
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