Claude review: drm/msm/dp: allow dp_ctrl stream APIs to use any panel passed to it

Claude Code Review Bot
2026-04-12T00:16:13Z

Patch Review

Splits `msm_dp_display_enable()` into `msm_dp_display_prepare()` (link training, PHY setup) and `msm_dp_display_enable_helper()` (stream-level setup). Introduces a `prepared` flag and `active_stream_cnt` counter to track link vs. stream state. This is the key architectural change for MST — the link is trained once, then multiple streams are enabled on it.

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