Claude review: drm/vmwgfx: Check vrefresh in drm_mode_setcrtc.

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

Patch Review

**Good fix for missing mode_valid callback.** The `drm_mode_config_funcs.mode_valid` callback is invoked from `drm_mode_setcrtc` but was not previously set for vmwgfx, meaning modes that only go through the legacy setcrtc path bypassed validation.

**Duplicated validation logic:** The new `vmw_kms_config_mode_valid()` duplicates a significant portion of the checks from `vmw_stdu_connector_mode_valid()` (size validation, memory checks, vrefresh). The stdu connector path checks additional constraints (stdu_max_width/height, max_mob_pages, max_mob_size) that the new config-level callback does not. This is reasonable since the config-level check applies to all display units (sou, ldu, stdu), but it would be worth a comment noting the relationship between the two validation levels.

**GPU_TILE_SIZE move is correct.** Moving the `#define GPU_TILE_SIZE 64` from `vmwgfx_stdu.c` to `vmwgfx_kms.h` makes sense since it's now used in `vmwgfx_kms.c` as well.

**vrefresh check added to stdu connector callback too** — good for consistency, covering both the atomic (connector mode_valid) and legacy (config mode_valid) paths.

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Generated by Claude Code Patch Reviewer