drm/amd/display: Enumerate LTTPR modes
[WHY] There are three possible modes for LTTPR: - Non-LTTPR mode, where AUX timeout is 400 us and no per-hop link training is done - LTTPR Transparent mode, where AUX timeout is 3200 us and no per-hop link training is done - LTTPR Non-Transparent mode, where AUX timeout is 3200 us and per-hop link training is done [HOW] Use an enum instead of a bool to track LTTPR state; modify comparisons accordingly. Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com> Reviewed-by: Jun Lei <Jun.Lei@amd.com> Acked-by: Anson Jacob <Anson.Jacob@amd.com> Tested-by: Dan Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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