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usb: typec: tcpm: AMS and Collision Avoidance

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This patch provides the implementation of Collision Avoidance introduced
in PD3.0. The start of each Atomic Message Sequence (AMS) initiated by
the port will be denied if the current AMS is not interruptible. The
Source port will set the CC to SinkTxNG if it is going to initiate an
AMS, and SinkTxOk otherwise. Meanwhile, any AMS initiated by a Sink port
will be denied in TCPM if the port partner (Source) sets SinkTxNG except
for HARD_RESET and SOFT_RESET.

Tested-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Kyle Tso <kyletso@google.com>
Link: https://lore.kernel.org/r/20210114145053.1952756-2-kyletso@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Kyle Tso
2021-01-14 22:50:51 +08:00
committed by Greg Kroah-Hartman
parent 7a79f1f7f7
commit 0908c5aca3
3 changed files with 531 additions and 102 deletions
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628
drivers/usb/typec/tcpm/tcpm.c
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File diff suppressed because it is too large Load Diff

1
include/linux/usb/pd.h
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@@ -479,6 +479,7 @@ static inline unsigned int rdo_max_power(u32 rdo)
#define PD_T_NEWSRC 250 /* Maximum of 275ms */
#define PD_T_SWAP_SRC_START 20 /* Minimum of 20ms */
#define PD_T_BIST_CONT_MODE 50 /* 30 - 60 ms */
#define PD_T_SINK_TX 16 /* 16 - 20 ms */
#define PD_T_DRP_TRY 100 /* 75 - 150 ms */
#define PD_T_DRP_TRYWAIT 600 /* 400 - 800 ms */

4
include/linux/usb/tcpm.h
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@@ -19,6 +19,10 @@ enum typec_cc_status {
TYPEC_CC_RP_3_0,
};
/* Collision Avoidance */
#define SINK_TX_NG TYPEC_CC_RP_1_5
#define SINK_TX_OK TYPEC_CC_RP_3_0
enum typec_cc_polarity {
TYPEC_POLARITY_CC1,
TYPEC_POLARITY_CC2,