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Prefer generic poll helpers over i915 custom helpers. The functional change is losing the exponentially growing sleep of wait_for(), which used to be 10, 20, 40, ..., 640, and 1280 us. Use an arbitrary constant 500 us sleep instead. The timeout remains at 50 ms. Reviewed-by: Jouni Högander <jouni.hogander@intel.com> Link: https://lore.kernel.org/r/6d50031411d5517508867d4b595ce90a2b44073b.1756383233.git.jani.nikula@intel.com Signed-off-by: Jani Nikula <jani.nikula@intel.com>