1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Google Chrome OS Developers Working On DRM Code

Google

Published on 09 August 2013 10:45 AM EDT
Written by Michael Larabel in Google
Comment On This Article

There doesn't appear to be much to get excited about right now, but it appears some Google developers working on Chrome/Chromium OS have begun working on some improvements to the Linux DRM (Direct Rendering Manager) kernel graphics drivers.

Hitting the DRI-devel mailing list this week is code from Google's Sean Paul for introducing a "drm_bridge" component to the DRM kernel subsystem.
This patch adds the notion of a drm_bridge. A bridge is a chained device which hangs off an encoder. The drm driver using the bridge should provide the association between encoder and bridge. Once a bridge is associated with an encoder, it will participate in mode set, dpms, and optionally connection detection.

Since a connector may not be able to determine the connection state downstream of the bridge, bridges may implement detect() which will take precedence over connector detect() if the bridge is already attached to an encoder and that encoder is already attached to the connector. In practical terms, this requires the drm driver to make these associations at init time, which is fine for SoC applications where this link is static.

This Linux kernel patch adds some new interfaces but doesn't change any existing mainline DRM driver in the 200 line patch. In a follow-up message, Nouveau founder turned Googler St├ęphane Marchesin wrote, "We have two bridges using it here, and we're working on adding a third. [Rob Clark with the Freedreno/Qualcomm driver] want to add one too."

It will be interesting to see what the Google Chrome OS developers are working on next as it concerns Linux graphics. In the past they worked a lot on Intel Gallium3D support to use the "i915g" driver for older Chromebooks. Let's hope this current DRM work is part of a grander plan. When it comes to the current ARM-based Google devices they seem to use the Samsung Exynos SoC that already has a basic open-source DRM driver and for their growing Qualcomm devices there's open-source driver work being done independently through Freedreno.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. A Walkthrough Of The New 32 System Open-Source Linux Benchmarking Test Farm
  2. Habey MITX-6771: Mini-ITX Board With Quad-Core J1900 Bay Trail
  3. OCZ Vector 150 SSD On Linux
  4. Noctua i4 CPU Cooler: Great For Cooling High-End LGA-2011v3 CPUs
Latest Linux Articles
  1. AMD Kaveri: Open-Source Radeon Gallium3D vs. Catalyst 14.12 Omega Driver
  2. 12-Way AMD Catalyst 14.12 vs. NVIDIA 346 Series Linux GPU Comparison
  3. AMD Catalyst 14.12 Omega Driver Brings Mixed Results For Linux Users
  4. 6-Way Winter 2014 Linux Distribution Comparison
Latest Linux News
  1. FSF's High Priority Project List Now Has A Committee
  2. Details On Using OpenACC & GPUs With GCC
  3. Ubuntu 15.04 Alpha 1 For Its Various Flavors
  4. Git 2.2.1 Released To Fix Critical Security Issue
  5. WTFTW: A Tiling Window Manager Written In Rust
  6. Jolla's Sailfish OS Update 10 Is Now Available
  7. HP To Launch Linux++ Operating System Next Year
  8. Civilization: Beyond Earth Launches For Linux
  9. NIR Has Been Revised As A New IR For Mesa
  10. New 64-bit Linux Kernel Vulnerabilities Disclosed This Week
Latest Forum Discussions
  1. XLennart: A Game For Systemd Haters With Nothing Better To Do
  2. Debian init discussion in Phoenix Wright format
  3. Bench specific mount point
  4. Tool for measuring FPS in games
  5. Need some hand holding with upgrading xserver
  6. Ubuntu Developers Still Thinking What To Do About Adobe Flash Support
  7. Microsoft buying Mojang
  8. Updated and Optimized Ubuntu Free Graphics Drivers