drm/i915/dsb: Avoid corrupting the first register write

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i915_gem_object_create_internal() does not hand out zeroed
memory. Thus we may confuse whatever stale garbage is in
there as a previous register write and mistakenly handle the
first actual register write as an indexed write. This can
end up corrupting the instruction sufficiently well to lose
the entire register write.

Make sure we've actually emitted a previous instruction before
attemting indexed register write merging.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230606191504.18099-7-ville.syrjala@linux.intel.com
Reviewed-by: Animesh Manna <animesh.manna@intel.com>

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Ville Syrjälä 2023-06-06 22:14:51 +03:00

parent 9055e73e8e

commit 088ca02108

1 changed files with 8 additions and 0 deletions

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

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