Claude review: drm/amd/display: clarify average bandwidth comment in dcn4_calcs

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

**Accuracy of the replacement comment**: Verified against the code. The four accumulation sites at lines 2867-2871 all include `+ cursor_bw[k]`, confirming the "cursor_bw is included" claim. No `tdlut` term appears anywhere in this loop body, confirming the "tdlut bandwidth is intentionally excluded" claim. The phantom pipe handling is also correct: the `if (!dml_is_phantom_pipe(...))` guard on lines 2866-2869 excludes phantom pipes from sys_active, while lines 2870-2871 (outside the guard) include all pipes in svp_prefetch.

**Comment style**: The old comment used C++ style (`//`), the new one uses C block comment style (`/* ... */`). The kernel coding style prefers C-style block comments, so this is a minor style improvement as well.

**Minor nit**: The commit message says "cursor_bw is already correctly included in all four accumulation sites *below* the comment" — this is accurate. One could argue the new comment is slightly verbose for what it describes, but given that the original FIXME expressed genuine confusion about a non-obvious design choice, the added detail is justified.

**Verdict**: Looks good. The patch resolves a stale FIXME with an accurate explanation of the existing behavior. No functional changes, no risk.

Reviewed-by: appropriate.

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Generated by Claude Code Patch Reviewer