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FROMGIT: usb: typec: tcpm: Move TCPC to APPLY_RC state during PR_SWAP

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When vbus auto discharge is enabled, TCPCI based TCPC transitions
into Attached.SNK/Attached.SRC state. During PR_SWAP, TCPCI based
TCPC would disconnect when partner changes power roles. TCPC has
to be moved APPLY RC state during PR_SWAP. This is done by
ROLE_CONTROL.CC1 != ROLE_CONTROL.CC2 and
POWER_CONTROL.AutodischargeDisconnect is 0. Once the swap sequence
is done, AutoDischargeDisconnect is re-enabled.

Bug: 185300749
Fixes: f321a02caebd ("usb: typec: tcpm: Implement enabling Auto Discharge disconnect support")
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Link: https://lore.kernel.org/r/20210517192112.40934-3-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 59d4d06c8ab0375dcc4bab329e6ecd44dd46373e
 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-next)
Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Change-Id: I28b2307cb2c8ccaccc611303a95cfe00f9cae35a
This commit is contained in:
Badhri Jagan Sridharan
2021-05-17 12:21:11 -07:00
committed by Todd Kjos
parent a7d161dc5a
commit 750135f7ae
2 changed files with 20 additions and 0 deletions
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4
include/linux/usb/tcpm.h
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@@ -66,6 +66,8 @@ enum tcpm_transmit_type {
* For example, some tcpcs may include BC1.2 charger detection
* and use that in this case.
* @set_cc: Called to set value of CC pins
* @apply_rc: Optional; Needed to move TCPCI based chipset to APPLY_RC state
* as stated by the TCPCI specification.
* @get_cc: Called to read current CC pin values
* @set_polarity:
* Called to set polarity
@@ -128,6 +130,8 @@ struct tcpc_dev {
int (*get_vbus)(struct tcpc_dev *dev);
int (*get_current_limit)(struct tcpc_dev *dev);
int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
int (*apply_rc)(struct tcpc_dev *dev, enum typec_cc_status cc,
enum typec_cc_polarity polarity);
int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
enum typec_cc_status *cc2);
int (*set_polarity)(struct tcpc_dev *dev,