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| .. | ||
| fu-plugin-realtek-mst.c | ||
| fu-realtek-mst-device.c | ||
| fu-realtek-mst-device.h | ||
| meson.build | ||
| README.md | ||
| realtek-mst.quirk | ||
Realtek MST
Introduction
This plugin updates the firmware of DisplayPort MST hub devices made by Realtek, such as the RTD2141b and RTD2142.
These devices communicate over I²C, via the DisplayPort aux channel. Devices are declared by system firmware, and quirks specify the aux channel to which the device is connected for a given system.
System firmware must specify the device's presence because while they can be identified partially through the presence of Realtek's OUI in the Branch Device OUI fields of DPCD (DisplayPort Configuration Data), they do not have unique Device Identification strings.
Firmware Format
The daemon will decompress the cabinet archive and extract a firmware blob in an unspecified binary file format, which is written to the partition of the device flash that is not currently running.
This plugin supports the following protocol ID:
- com.realtek.rtd2142
GUID Generation
Devices use custom DeviceInstanceId values derived from device names provided by system firmware and read from sysfs, like:
- REALTEK-MST\NAME_10EC2142:00
- REALTEK-MST\NAME_10EC2142:00&FAMILY_Google_Hatch
Quirk use
This plugin uses the following plugin-specific quirks:
| Quirk | Description | Minimum fwupd version |
|---|---|---|
RealtekMstDpAuxName |
Specifies the name of the drm_dp_aux_dev channel over which the device should be reached. | 1.6.2 |
Vendor ID security
The vendor ID is specified by system firmware (such as ACPI tables).
External interface access
This plugin requires access to i2c buses associated with the specified
DisplayPort aux channel, usually /dev/i2c-5 or similar.