drm/i915/dp: return number of bytes written for short aux/i2c writes
Allow for a larger receive data size, and check if the receiver returned the number of bytes written. Without this, we've basically skipped all the unwritten bytes for short writes. Signed-off-by: NJani Nikula <jani.nikula@intel.com> Reviewed-by: NVille Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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