AMD Rolls Out New Firmware For A Number Of GPUs - Phoronix

In Summary :

AMD has landed a number of updated firmware images into the linux-firmware tree for their recent generations of hardware.

There is updated Radeon GPU firmware for Raven Ridge, Fiji, Tonga, Stoney, Topaz, Carrizo, Vega 10, Polaris 10, Polaris 11, and Polaris 12 GPU families. More or less, the newer AMD GPUs now have updated firmware available. [...]
kindly refer the following link as follow up :
https://www.phoronix.com/scan.php?page=news_item&px=AMDGPU-Firmware-May-2018