tree e06276daca1002f45c2a0902402b43afb521fc9a
parent 0aacc629f48459a1f8169120afc868cdb48f0593
author Jonas Larsson <ljonas@google.com> 1580780878 -0800
committer Jonas Larsson <ljonas@google.com> 1594766105 -0700

Use physically contiguous lower 3G memory for UVC cameras.

On i.MX this is required for the hardware encoder (VPU) to be
able to encode camera frames. The encoder only takes one bus
address (plus length) to a frame to encode so the entire frame
must be in physically contiguous memory.

Further, this is also needed to take the frame buffers exported
as dma-buf and feed to the GPU, which can't handle buffers in
memory over 3GB.

Bug: 148406831
Bug: 161286409

Change-Id: I3b36162322c174531c92a2726fe19d680899ec8d