Claude review: drm/msm: Fix GMEM_BASE for A650

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

Patch Review

**Correctness: Good.** The enum in `adreno_gpu.h:47-50` shows:
```
ADRENO_6XX_GEN1,  /* a630 family */
ADRENO_6XX_GEN2,  /* a640 family */
ADRENO_6XX_GEN3,  /* a650 family */
ADRENO_6XX_GEN4,  /* a660 family */
```

The `adreno_is_a650_family()` helper at `adreno_gpu.h:540-541` explicitly includes both GEN3 and GEN4:
```c
return gpu->info->family == ADRENO_6XX_GEN3 ||
       gpu->info->family == ADRENO_6XX_GEN4;
```

So the original intent was to return `GMEM_BASE = 0` for a650 family and above. The regressing commit changed the `>=` threshold to `ADRENO_6XX_GEN4`, excluding GEN3 (a650). Changing it to `>= ADRENO_6XX_GEN3` restores the correct behavior and is also a cleaner expression than the original pair of `adreno_is_a650_family() || adreno_is_a740_family()` checks, since all families from GEN3 onward should use GMEM_BASE of 0.

**Commit message:** Clear and well-written. Correctly identifies the regressing commit, the root cause, and the symptom (rendering corruption). Has the appropriate `Fixes:` tag.

**No issues found.** This is a clean, minimal one-line regression fix.

Reviewed-by worthy. No changes requested.

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Generated by Claude Code Patch Reviewer