Tegra/Mainline SW/Linux kernel

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< Tegra‎ | Mainline SW
Revision as of 06:15, 17 August 2022 by G0hl1n (talk | contribs) (Transform list of mainline features into a table)
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NVIDIA Tegra SoCs are well supported by mainline kernels.

Kernel releases may be obtained from:

The following mainline kernel releases introduced support for Tegra SoCs:

  • Tegra20 has been upstream for many years.
  • Tegra30 support was added in v3.3.
  • Tegra114 support was added in v3.9.
  • Tegra124 support was added in v3.13.

The first kernel release to support a given SoC has historically contained extremely minimal support. One or two kernel releases later will typically be the first useful version.

Features that already work are:

Function Tegra20 Tegra30 Tegra114 Tegra124
It boots! YES > v3.3 > v3.9 > v3.13
Serial console YES YES YES YES
CPU hotplug YES YES YES YES
CPU frequency scaling YES ? ? ?
I2C master YES YES YES YES
Regulators YES YES YES YES
SPI YES YES YES YES
SD/eMMC YES YES YES YES
USB 2.0 Host YES YES YES YES
RGB/LVDS Display YES YES ? ?
DSI Display ? ? YES ?
eDP Display ? ? ? YES
HDMI Display YES YES YES YES
PCIe YES YES ? ?

A probably-incomplete list of features that are not yet implemented is:

  • Kepler GPU support via Nouveau (work in progress).
  • Advanced (high-speed) transfer modes for SD and eMMC. IO voltage scaling.
  • PCIe on Tegra124. Thierry Reding is working on this.
  • USB3 controller. Andrew Bresticker is working on this.
  • SATA.
  • USB2 device mode and OTG.
  • SKU awareness (SKU-specific clock and thermal limits).
  • POR (Plan Of Record) clocks.
  • cpufreq for SoCs other than Tegra20.
  • EMC (memory controller) frequency scaling.
  • DVFS (Dynamic Voltage and Frequency Scaling).
  • Thermal management.
  • USB2 bus power saving.
  • I2C slave support. The Toshiba AC100 NVEC driver could be generalized to provide this.
  • SPI slave support?