AMDGPU Linux Driver Gets Ready For eDP 1.5 Panels With 6.75 Gbps/Lane

Written by Michael Larabel in Radeon on 24 March 2023 at 06:26 AM EDT. 7 Comments
Sent out today were the latest AMDGPU Display Core "DC" patches having the latest work done by AMD internally on this display/monitor portion of their driver code. Notable with this round of 19 patches is preparation work for upcoming eDP 1.5 laptop displays.

Back in late 2021 was the publishing of the eDP 1.5 specification by VESA. The eDP 1.5 spec is backwards compatible with eDP 1.4 while adding an improved Panel Self Refresh (PSR) protocol, improved Adaptive-Sync, and other updates. Among those other changes is adding a 6.75 Gbps/lane option for panels.

The AMDGPU DC code is getting ready for supporting eDP 1.5 panels with 6.75 Gbps/lane and today's patch series makes those preparations. But with not yet having any eDP 1.5 panels supporting that rate, the Linux driver is only exposing that mode when the driver is built with a new "support_eDP1_5" debugging option.

The 6.75 Gbps/lane / eDP 1.5 preparations are part of today's AMDGPU DC patch series. Also part of that patch series is an FPO optimization that for some configurations could help in achieving a lower voltage for the GPU.
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