AMD Radeon Linux Driver Sees Patches For New "Sienna Cichlid" GPU
The patches indicate Sienna Cichlid is a Navi-based GPU with new VCN 3.0 capabilities for video encoding and DCN3 on the display front and a variety of other alterations compared to the existing Navi support.
It's quite possible Sienna Cichlid is the "big Navi" / RDNA2 GPU. AMD developers have talked before of using alternative codenames when volleying patches early for their open-source Linux driver stack as to not reveal the product/marketing codenames, which could be the case here. This is the first time we are hearing of Sienna Cichlid or seeing any references on the web of it related to AMD.
Still digging through the 207 patches for the AMD Radeon Sienna Cichlid, but will update if seeing anything else of note. For the most part it's leveraging the existing Navi code paths but the usual churn surrounding firmware, clock-gating / power management differences, and other modifications in the usual spots for bringing up new hardware. The main code additions primarily pertain to the new DCN3 and VCN3 blocks.
Given the timing of these patches, the AMD Sienna Cichlid won't be mainlined until the Linux 5.9 merge window opening in August and then releasing in stable around October. That timeframe at least does point to Sienna Cichlid likely being the "RDNA 2" graphics card launch coming later in the calendar year.
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