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usb: typec: Add driver for DisplayPort alternate mode

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DisplayPort USB Type-C Alt Mode allows DisplayPort displays
and adapters to be attached to the USB Type-C ports on the
system.

Signed-off-by: Heikki Krogerus <[email protected]>
Tested-by: Hans de Goede <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Heikki Krogerus 2018-06-27 18:19:51 +03:00 • committed by Greg Kroah-Hartman
commit 0e3bb7d689
7 changed files with 741 additions and 0 deletions
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49
Documentation/ABI/testing/sysfs-driver-typec-displayport Normal file
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What: /sys/bus/typec/devices/.../displayport/configuration
Date: July 2018
Contact: Heikki Krogerus <[email protected]>
Description:
Shows the current DisplayPort configuration for the connector.
Valid values are USB, source and sink. Source means DisplayPort
source, and sink means DisplayPort sink.
All supported configurations are listed as space separated list
with the active one wrapped in square brackets.
Source example:
USB [source] sink
The configuration can be changed by writing to the file
Note. USB configuration does not equal to Exit Mode. It is
separate configuration defined in VESA DisplayPort Alt Mode on
USB Type-C Standard. Functionally it equals to the situation
where the mode has been exited (to exit the mode, see
Documentation/ABI/testing/sysfs-bus-typec, and use file
/sys/bus/typec/devices/.../active).
What: /sys/bus/typec/devices/.../displayport/pin_assignment
Date: July 2018
Contact: Heikki Krogerus <[email protected]>
Description:
VESA DisplayPort Alt Mode on USB Type-C Standard defines six
different pin assignments for USB Type-C connector that are
labeled A, B, C, D, E, and F. The supported pin assignments are
listed as space separated list with the active one wrapped in
square brackets.
Example:
C [D]
Pin assignment can be changed by writing to the file. It is
possible to set pin assignment before configuration has been
set, but the assignment will not be active before the
connector is actually configured.
Note. As of VESA DisplayPort Alt Mode on USB Type-C Standard
version 1.0b, pin assignments A, B, and F are deprecated. Only
pin assignment D can now carry simultaneously one channel of
USB SuperSpeed protocol. From user perspective pin assignments C
and E are equal, where all channels on the connector are used
for carrying DisplayPort protocol (allowing higher resolutions).