usb: typec: ucsi: add support for separate DP altmode devices

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CCGx controller used on NVIDIA GPU card has two separate display
altmode for two DP pin assignments. UCSI specification doesn't
prohibits using separate display altmode.

Current UCSI Type-C framework expects only one display altmode for
all DP pin assignment. This patch squashes two separate display
altmode into single altmode to support controllers with separate
display altmode. We first read all the alternate modes of connector
and then run through it to know if there are separate display
altmodes. If so, it prepares a new port altmode set after squashing
two or more separate altmodes into one.

Signed-off-by: Ajay Gupta <ajayg@nvidia.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20191230133431.63445-3-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Ajay Gupta 2019-12-30 16:34:31 +03:00 • committed by Greg Kroah-Hartman

parent 71a1fa0df2

commit 170a6726d0

3 changed files with 279 additions and 2 deletions

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79

drivers/usb/typec/ucsi/ucsi.c

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11

drivers/usb/typec/ucsi/ucsi.h

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191

drivers/usb/typec/ucsi/ucsi_ccg.c

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