linux-stable.git/drivers/usb/typec/altmodes, branch v5.2

usb: typec: Add driver for NVIDIA Alt Modes

2019-04-25T09:04:56+00:00

Latest NVIDIA GPUs support VirtualLink device. Since USBIF
has not assigned a Standard ID (SID) for VirtualLink
so using NVIDA VID 0x955 as SVID.

Signed-off-by: Ajay Gupta 
Signed-off-by: Heikki Krogerus 
Signed-off-by: Greg Kroah-Hartman

usb: typec: displayport: Export probe and remove functions

2019-04-25T09:04:55+00:00

VirtualLink standard extends the DisplayPort Alt Mode by
utilizing also the USB 2 pins on the USB Type-C connector.
It uses the same messages as DisplayPort, but not the DP
SVID. At the time of writing, USB IF has not assigned a
Standard ID (SID) for VirtualLink, so the manufacturers of
VirtualLink adapters use their Vendor IDs as the SVID.

Since the SVID specific communication is exactly the same as
with DisplayPort alternate mode, there is no need to
implement separate driver for VirtualLink. We'll handle the
current VirtualLink adapters with probe drivers, and once
there is SVID assigned for it, we add it to the displayport
alt mode driver.

To support probing drivers, exporting the probe and remove
functions, and also changing the DP_HEADER helper macro to
use the SVID of the alternate mode device instead of the
DisplayPort alt mode SVID.

Suggested-by: Heikki Krogerus 
Signed-off-by: Ajay Gupta 
Signed-off-by: Heikki Krogerus 
Signed-off-by: Greg Kroah-Hartman

usb: typec: altmodes/displayport: Fall back to multi-func pins

2019-03-19T14:00:34+00:00

If our port-partner supports both DP-only operation (pin-assignment C)
and multi-func operation (pin-assignment D) and we only support
pin-assignment D and the port-partner prefers DP-only mode, then
before this commit we would and up masking out pin-assignment D from
the available pin-assignments and fail to pick a pin-assignment.

Instead only mask out the multi-func pin-assignments if we support
dp-only pin-assignments, so that we correctly fall-back to a multi-func
pin-assignment in this case (by picking pin-assignment D).

Signed-off-by: Hans de Goede 
Acked-by: Heikki Krogerus 
Signed-off-by: Greg Kroah-Hartman

usb: typec: displayport: Move the Configuration VDO helpers to the header

2019-02-08T09:25:12+00:00

The helpers used for reading and writing the pin assignment
from and to the Configuration VDO will be useful in GPU
drivers, and also UCSI driver after DisplayPort alt mode
support is added to it.

Signed-off-by: Heikki Krogerus 
Signed-off-by: Greg Kroah-Hartman

USB: add missing SPDX lines to Kconfig and Makefiles

2019-01-22T08:08:17+00:00

There are a few remaining drivers/usb/ files that do not have SPDX
identifiers in them, all of these are either Kconfig or Makefiles.  Add
the correct GPL-2.0 identifier to them to make scanning tools happy.

Signed-off-by: Greg Kroah-Hartman

usb: typec: unlock dp->lock on error exit path, and also zero ret if successful

2018-07-06T14:36:19+00:00

One of the error handling paths forgets to unlock dp->lock on the error
exit path leading to a potential lock-up.  Also the return path for a
successful call to the function configuration_store can return an
uninitialized error return code if dp->alt->active is false, so ensure
ret is zeroed on the successful exit path to avoid garbage being returned.

Detected by CoverityScan, CID#1471597 ("Unitialized scalar variable")

Fixes: 0e3bb7d6894d ("usb: typec: Add driver for DisplayPort alternate mode")
Signed-off-by: Colin Ian King 
Acked-by: Heikki Krogerus 
Signed-off-by: Greg Kroah-Hartman

usb: typec: Add driver for DisplayPort alternate mode

2018-07-02T15:42:36+00:00

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 
Tested-by: Hans de Goede 
Signed-off-by: Greg Kroah-Hartman