The big project for the last two weeks has been developing dmabuf fencing support for vc4.  Without dmabuf fences, when passing buffers between devices the user needs to manually wait for the job to finish on one (say, camera snapshot) before letting the other device get started (accumulating GL commands to texture from the camera snapshot).  That ( Read more... )

Last week I sent pull requests for bcm2835 changes for 4.12.  We've got some DT updates for HDMI audio, DSI, and SDHOST, and defconfig changes to enable SDHOST.  The DT changes to actually enable SDHOST (and get wifi working on Pi3) won't land until 4.13 ( Read more... )

The biggest news this week is that I've landed the VC4 HDMI audio driver from Boris in drm-misc-next.  The alsa-lib maintainers took the patch today for the automatic configuration file, so now we just need to get that backported to various distributions and we'll have native HDMI audio in 4.12 ( Read more... )

It's been a while since I've posted a status update.  Here are a few things that have been going on.

VC4 now generates HTML documentation from the comments in the kernel code.  It's just a start, but I'm hoping to add more technical details of how the system works here.  I don't think doxygen-style documentation of individual functions would be ( Read more... )

Probably the biggest news of the last two weeks is that Boris's native HDMI audio driver is now on the mailing list for review.  I'm hoping that we can get this merged for 4.12 (4.10 is about to be released, so we're too late for 4.11).  We've tested stereo audio so far, no compresesd audio (though I think it should Just Work), and >2 channel audio ( Read more... )

Most of last week was spent switching my development environment over to a setup with no SD cards involved at all.  This was triggered by yet another card failing, and I spent a couple of days off and on trying to recover it.  I now have three scripts that build and swap my test environment between upstream 64-bit Pi3, upstream 32-bit Pi3, and ( Read more... )

I spent last week at linux.conf.au 2017 (the best open source conference), mostly talking to people and going to talks instead of acually hacking on vc4.  I'd like to highlight a few talks you could go watch if you weren't there.

Jack Moffit gave an overview of what Servo is doing with Rust on parallel processing and process isolation in web ( Read more... )

Last week I was on vacation, but the week before that I did some more work on figuring out Intel's Mesa CI system, and Mark Janes has started working on some better documentation for it.  I now understand better how the setup is going to work, but haven't made much progress on actually getting a master running yet ( Read more... )

The 3DMMES test has been thoroughly instruction count limited, so any wins we can get on code generation translate pretty directly into performance gains.  Last week I decided to work on fixing up Jonas's patch to schedule instructions in the delay slots of thread switching, which can save us 3 instructions per texture sample ( Read more... )

Two big successes last week ( Read more... )