** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: intel
Status: New => Fix Released
** Changed in: linux (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1801260
Title:
USB Type-C Alternate Mode support
Status in intel:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Bug description:
Description
Let's track here the progress for generic alternate mode support. The
discovery and entering/exiting the modes is common for all alternate modes, and
the USB PD code will handle that. The tasks currently related to this task are:
1) The alternate modes will need custom control that we don't want to
mix into the generic USB PD code. For example the DP altmode defines
custom VDM (Vendor Defined Message) for "configure" and "status"
commands. So we will need to create somekind of API for Alternate Mode
"drivers".
2) The Alternate Modes need to keep the underlying components and
drivers informed about their status, possibly even allow some control.
For example, with DP altmode the graphics side will need to know the
cable orientation and the number of lanes (the modes define the pin
configuration in DP altmode, so the numer of available lanes as well
AFAIK). So we need API for this.
*) UCSI may need some special attention, as with UCSI we don't handle
the USB PD communication. We just get the status of the port. But we
will know which alternate mode has been enterred, and we can actually
request enter/exit a mode even with UCSI. But we don't know for
example the cable orientation.
Commits:
0e3bb7d6894d9b6e67d6382bb03a46a1dc989588
49cbb33dfdeb7651b91c2316a61b644d8e6cfe22
4ab8c18d4d67321cc7b660559de17511d4fc0237
8a37d87d72f0c69f837229c04d2fcd7117ea57e7
93dd2112c7b2fa5512cc4aff2c449420487fcb68
e9576fe8e605c4413beb91b290b8a473985710de
Target Kernel: 4.19
Target Release: 19.04
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