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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu Bionic)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1864147
Title:
[bionic] Support Intel Atom (Baytrail-I) HS-UART serdev slaves over
tty
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Bionic:
Incomplete
Bug description:
[SRU Justification]
[Impact]
Support Intel Atom (Baytrail-I) HS-UART serdev slaves over tty
On systems using Intel Atom (Baytrail-I) SoC's, slave devices connected on
HSUART1/2 ports are described by the ACPI BIOS as virtual hardware using
HID's INT3511/INT3512.
As a consequence, HW manufacturers have complete freedom to install any
devices on-board as long as they can be accessed over serial tty
interface. Once such device is Dell Edge 3002 IoT Gateway which sports
ZigBee & GPS devices on the HS-UART ports 1 & 2 respectively.
Post 4.15, with CONFIG_SERIAL_DEV_BUS=y, serdev port controller driver
handles the enumeration for the slaves connected on these ports. Also,
/dev/ttySx device nodes for these ports are no longer exposed to the
userspace.
[Fixes]
This patchset allows the skipped virtual UART's with ACPI HID's mentioned
above to be enumerated as ttyHSx port.
[Regression Potential]
Low. This driver binds only to Intel Atom E38XX (Baytrail-I) virtual serial
ports on the Dell Edge 300x GW. These updates are being carried in the
linux-oem (4.15.y) kernel for more than 2 years without any regressions.
[Note]
This driver has been submitted upstream and is under review. This issue has
been identified as a regression in 4.15 and multiple solutions are being
explored. Meanwhile, to support customer and maintain release schedule,
this driver needs to be in Ubuntu 4.15 based kernels.
More info:
https://marc.info/?t=152455871600007&r=1&w=2
linux-oem buglink: http://bugs.launchpad.net/bugs/1690362
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