Claude review: backlight: ktd2801: enable BL_CORE_SUSPENDRESUME

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

Patch Review

**Status: Good to merge**

The change adds a single line to `ktd2801_backlight_ops`:

```c
static const struct backlight_ops ktd2801_backlight_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.update_status = ktd2801_update_status,
};
```

This is the standard pattern used by many other backlight drivers (e.g., `pwm_bl`, `lp855x`, `gpio_backlight`, etc.) to have the backlight core handle suspend/resume automatically. When this flag is set, the core calls `backlight_suspend()` / `backlight_resume()` which sets `fb_blank` to `FB_BLANK_POWERDOWN` on suspend and restores it on resume, triggering `update_status`.

The existing `ktd2801_update_status` already handles this correctly:
- `backlight_is_blank()` returning true triggers `expresswire_power_off()` (line 40)
- On resume, `expresswire_enable()` is called followed by the brightness write (lines 46-50)

The `was_on` tracking (lines 41, 45-48) ensures the enable/disable sequencing is correct across suspend/resume cycles.

The `Cc: stable@vger.kernel.org # v6.19` tag is appropriate since this is a bug fix for a driver introduced in that version.

No issues found.

---
Generated by Claude Code Patch Reviewer