drm/i915: Clarify error returns from display port aux channel I/O
Use distinct error return values for each kind of aux channel I/O failure.
Signed-off-by:
Keith Packard <keithp@keithp.com>
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Use distinct error return values for each kind of aux channel I/O failure.
Signed-off-by:
Keith Packard <keithp@keithp.com>