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When examining the VCN function init, it is common to find a loop that initializes VCN rings, which uses one IRQ per instance. However, VCN 4.0.3 deviates from this pattern, as it includes a distinct field to differentiate instances, which results in a slightly different ring init. This commit makes this difference explicit by using a fixed index when initializing the ring buffer and also adds a comment. Signed-off-by: Rodrigo Siqueira <siqueira@igalia.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>