drm/i915: Verify the BIOS FB first PTE on non-LMEMBAR systems

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Now that we have intel_ggtt_read_entry() we can easily read out the
first PTE of the BIOS FB and verify that it looks correct. We'll
also use the extracted dma address to figure out where in stolen
the FB lives (so far we've just assumed that it sits at offset 0,
and in practice that does seem to be true, but better safe than
sorry).

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250313140838.29742-7-ville.syrjala@linux.intel.com
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>

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Ville Syrjälä 2025-03-13 16:08:34 +02:00

parent 50596bdd4e

commit 4bef6b0e10

1 changed files with 29 additions and 2 deletions

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drivers/gpu/drm/i915/display/intel_plane_initial.c

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