Claude review: drm/imx: Fix three kernel-doc warnings in dcss-scaler.c

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

Patch Review

**Status: Looks good**

The patch adds three missing `@param` entries to kernel-doc comments:

1. `@phase0_identity` in `dcss_scaler_gaussian_filter()` (line 169) — description "whether to override phase 0 coefficients with identity filter" accurately matches the usage at line 227:
   ```c
   /* override phase 0 with identity filter if specified */
   if (phase0_identity)
       for (i = 0; i < PSC_NUM_TAPS; i++)
           coef[0][i] = i == (PSC_NUM_TAPS >> 1) ?
                       (1 << PSC_COEFF_PRECISION) : 0;
   ```

2. `@phase0_identity` in `dcss_scaler_filter_design()` (line 266) — same description, parameter is passed through to `dcss_scaler_gaussian_filter()`. Accurate.

3. `@nn_interpolation` in `dcss_scaler_filter_design()` (line 268) — description "whether to use nearest neighbor instead of gaussian filter" accurately matches the usage at line 283:
   ```c
   if (nn_interpolation)
       dcss_scaler_nearest_neighbor_filter(use_5_taps, coef);
   else
       dcss_scaler_gaussian_filter(fc_q, use_5_taps, phase0_identity, coef);
   ```

**Minor nit (non-blocking):** In `dcss_scaler_filter_design()`, the `@coef` and `@nn_interpolation` doc entries are ordered as `@coef` then `@nn_interpolation`, but the function signature has `coef` before `nn_interpolation` too — so the ordering is correct. Good.

**On the Fixes tag:** The `Fixes:` tag pointing to the original commit `9021c317b770` ("drm/imx: Add initial support for DCSS on iMX8MQ") is technically correct since that's where the undocumented parameters were introduced, though using `Fixes:` for a kernel-doc-only change is debatable — this isn't fixing a functional bug. It's common practice either way, so this is just a style observation.

**Verdict:** Patch is correct and ready to apply. The descriptions are accurate, the parameter order in the doc comments matches the function signatures, and the three W=1 warnings will be resolved.

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