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

Improving Linux DRM For Embedded Systems

Linux Kernel

Published on 13 April 2012 07:41 AM EDT
Written by Michael Larabel in Linux Kernel
1 Comment

A set of Direct Rendering Manager patches have appeared to ease the development of targeting DRM drivers for embedded systems. There's also two new DRM drivers using this SDRM layer.

These patches for DRM on embedded systems provide "helpers" to take care of the DRM device and introduce an "SDRM" layer. The helpers can setup the CRTCs, encoders, connectors, and other components as separate devices rather than having the current monolithic design to a DRM driver. This work is based upon some of the Exynos driver patches by Samsung but was written by Sascha Hauer of the German-based Pengutronix.

Sascha was writing a new DRM driver when realizing it shared much common code with the Exynos driver, so he's generalized it into this DRM helper set. Last month I wrote that Sascha Hauer was working on a new DRM driver and it turns out with this DRM helpers work he's written i.MX LCDC and Intel (Marvell) PXA2xx drivers, both of which are described as "very simple last-decade-embedded-lcd-controllers." These new drivers have been tested against the xf86-video-modesetting driver for X.Org usage along with a custom KMS testing tool and libdrm tests.

As said in Hauer's mailing list message, "The drivers posted here are mostly created for demonstration purpose and to give a template for other drivers, but the motivation for creating this layer was the i.MX5/6 IPU (Image Processing Unit) which has two crts (four
on i.MX6), several on-SoC encoders and overlay possibilities. So this layer should not be limited to the real 'simple' cases...The sdrm patches currently have some limitations, but they should be enough for being useful and to present it to a wider audience."

The DRM helpers support is spread into seven patches with adding an SDRM layer for general embedded systems support (the layer allows for creating simple DRM devices), the i.MX KMS driver, and the PXA KMS driver. As far as how this eases development, the i.MX KMS driver is a mere 525 lines of code while the PXA LCDC KMS driver is 863 lines of code.

While there's been good embedded/mobile DRM news this week with this news here, the open-source ARM Mali driver milestone, and a NVIDIA TEGRA DRM/KMS driver, there still is an exciting GPU driver code drop that Phoronix will get to break the news on today or tomorrow.

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. Preview: AMD's FX-9590 Eight-Core At Up To 5.0GHz On Linux
  2. Intel Launches The Core i7 5960X, Mighty Powerful Haswell-E CPUs
  3. AMD Radeon R9 290: Gallium3D vs. Catalyst Drivers
  4. AMD Radeon R9 290 Open-Source Driver Works, But Has A Ways To Go
Latest Linux Articles
  1. Ondemand vs. Performance CPU Governing For AMD FX CPUs On Linux 3.17
  2. How Intel Graphics On Linux Compare To Open-Source AMD/NVIDIA Drivers
  3. The Fastest NVIDIA GPUs For Open-Source Nouveau With Steam Linux Gaming
  4. Testing For The Latest Linux Kernel Power Regression
Latest Linux News
  1. Marek Lands Radeon Gallium3D HyperZ Improvements
  2. Mozilla Firefox 32 Surfaces With HTML5, Developer Changes
  3. Nouveau X.Org Driver Released With DRI3+Present, Maxwell, GLAMOR
  4. Microsoft & AMD Release C++ AMP Compiler With Linux Support
  5. AMD, Wine & Valve Dominated August For Linux Users
  6. Linux 3.17-rc3 Kernel Released Back On Schedule
  7. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  8. Mesa 10.3 RC2 Arrives Via Its New Release Manager
  9. Ubuntu 14.10's Lack Of X.Org Server 1.16 Gets Blamed On AMD
  10. MSI Motherboard BIOS Updating Remains A Pain For Linux Users
Latest Forum Discussions
  1. Lennart Poettering Talks Up His New Linux Vision That Involves Btrfs
  2. Best Radeon for a Power Mac G5?
  3. The dangers of Linux kernel development
  4. Updated and Optimized Ubuntu Free Graphics Drivers
  5. AMD Releases UVD Video Decode Support For R600 GPUs
  6. SSD seems slow
  7. Is laptop with Intel CPU and AMD dGPU worth buying considering especially AMD Enduro?
  8. Radeon HD5670 and Ubuntu 14.04