The Xiaomi 15 supports Raise to wake. It utilizes the phone's accelerometer to accomplish. When enabled, it allows your phone's screen to automatically wake up or turn on when you pick up or raise the device and shows your lock screen, notifications, or the time without the need to press any buttons.
To enable Raise to wake on your phone, please refer to the following steps:
1. Go to [Settings] on your phone;
2. Swipe down to find and tap [Lock screen];
3. Enable [Raise to wake].
Does it help?