VCN Load Balancing, LTTPR, More Aldebaran + Other Changes For Radeon In Linux 5.13

Written by Michael Larabel in Radeon on 2 April 2021 at 05:45 AM EDT. Add A Comment
Another round of AMDGPU kernel driver updates were sent out on Thursday to DRM-Next ahead of the Linux 5.13 merge window opening in a few weeks.

Given the timing, this might be the last feature pull of new AMD Radeon graphics driver material for the 5.13 cycle. There have already been earlier DRM-Next pulls for 5.13 on the AMD side that included Aldebaran GPU support, FreeSync HDMI, Display ASSR, and more.

With this week's batch of AMDGPU changes the newest open-source driver work includes:

- Restoring GPU reset support for VanGogh APUs.

- Adding GPU reset support for Aldebaran along with other GPU support updates for that next-gen CDNA accelerator.

- A power management fix/optimization so if the device has run-time suspended, it won't be powered back up again for performing a system suspend and likewise if it was run-time suspended it won't be woken up on system resume only to be turned back off again for run-time power management.

- Support for VCN load balancing with asymmetric engines.

- Initial work for supporting DisplayPort LTTPR as the Link-Training Tunable PHY Repeater. LTTPR is intended to address distorted signals between the GPU and the display such as with docking stations to have this repeater for guaranteeing signal integrity. The AMDGPU driver has initial support around LTTPR interfaces.

- A variety of other fixes from power management to SR-IOV to other newer hardware issues resolved.

The full list of changes for this latest batch of AMDGPU material can be found on dri-devel.
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