https://wccftech.com/delays-hold-back-amd-hip-linux-gpu-acceleration-for-blender-3-2-release/

Blender 3.0 introduced AMD HIP acceleration to the Cycles X render coding due to the removal of OpenCL. The support from AMD for Blender was restricted to Windows systems only, with probably Linux support added for Blender 3.1. However, AMD's delay on drivers means that the HIP Linux support is now anticipating a launch with Blender 3.2. Blender 3.1 will launch in March 2022.

Brian Savery, Product Manager for AMD's ProRender software, remarked on the tracking ticket for the AMD HIP Cycles X render code: