Claude review: drm/bridge: ite-it66121: Move .mode_set logic to .atomic_enable

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

Patch Review

**Clean refactor.** The mode_set logic is correctly extracted into `it66121_set_mode()` and called from `atomic_enable`. The `ctx->connector` field is removed in favor of a local variable, which is the right approach.

**Mode lookup through atomic state is correct:**
```c
conn_state = drm_atomic_get_new_connector_state(state, connector);
crtc = conn_state->crtc;
crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
mode = &crtc_state->adjusted_mode;
```
Each step correctly chains through the state to get the adjusted mode. The `WARN_ON` checks for NULL at each stage are defensive and appropriate.

**Enable ordering:**
```c
drm_atomic_helper_connector_hdmi_update_infoframes(connector, state);
it66121_set_mode(ctx, connector, state);
it66121_set_mute(ctx, false);
```
Infoframes are written before the TX mode is configured. This works because the infoframe data is just stored in hardware registers — actual transmission starts when the TX mode is enabled. However, the more natural order would be to configure the TX mode first, then enable infoframes. If there's a reason the IT66121 requires this order, a comment would help.

**The `connector = NULL` cleanup in `bridge_disable` is correctly removed**, since `connector` is now a local variable.

---
Generated by Claude Code Patch Reviewer