From: Badhri Jagan Sridharan badhri@google.com
commit 4288debeaa4e21d8dd5132739ffba2d343892bbf upstream.
"Table 4-3 VBUS Sink Characteristics" of "Type-C Cable and Connector Specification" defines the disconnect voltage thresholds of various configurations. This change fixes the disconnect threshold voltage calculation based on vSinkPD_min and vSinkDisconnectPD as defined by the table.
Fixes: e1a97bf80a022 ("usb: typec: tcpci: Implement Auto discharge disconnect callbacks") Cc: stable stable@vger.kernel.org Acked-by: Heikki Krogerus heikki.krogerus@linux.intel.com Signed-off-by: Badhri Jagan Sridharan badhri@google.com Link: https://lore.kernel.org/r/20210615174323.1160132-1-badhri@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/typec/tcpm/tcpci.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-)
--- a/drivers/usb/typec/tcpm/tcpci.c +++ b/drivers/usb/typec/tcpm/tcpci.c @@ -21,8 +21,12 @@ #define PD_RETRY_COUNT_DEFAULT 3 #define PD_RETRY_COUNT_3_0_OR_HIGHER 2 #define AUTO_DISCHARGE_DEFAULT_THRESHOLD_MV 3500 -#define AUTO_DISCHARGE_PD_HEADROOM_MV 850 -#define AUTO_DISCHARGE_PPS_HEADROOM_MV 1250 +#define VSINKPD_MIN_IR_DROP_MV 750 +#define VSRC_NEW_MIN_PERCENT 95 +#define VSRC_VALID_MIN_MV 500 +#define VPPS_NEW_MIN_PERCENT 95 +#define VPPS_VALID_MIN_MV 100 +#define VSINKDISCONNECT_PD_MIN_PERCENT 90
#define tcpc_presenting_rd(reg, cc) \ (!(TCPC_ROLE_CTRL_DRP & (reg)) && \ @@ -324,11 +328,13 @@ static int tcpci_set_auto_vbus_discharge threshold = AUTO_DISCHARGE_DEFAULT_THRESHOLD_MV; } else if (mode == TYPEC_PWR_MODE_PD) { if (pps_active) - threshold = (95 * requested_vbus_voltage_mv / 100) - - AUTO_DISCHARGE_PD_HEADROOM_MV; + threshold = ((VPPS_NEW_MIN_PERCENT * requested_vbus_voltage_mv / 100) - + VSINKPD_MIN_IR_DROP_MV - VPPS_VALID_MIN_MV) * + VSINKDISCONNECT_PD_MIN_PERCENT / 100; else - threshold = (95 * requested_vbus_voltage_mv / 100) - - AUTO_DISCHARGE_PPS_HEADROOM_MV; + threshold = ((VSRC_NEW_MIN_PERCENT * requested_vbus_voltage_mv / 100) - + VSINKPD_MIN_IR_DROP_MV - VSRC_VALID_MIN_MV) * + VSINKDISCONNECT_PD_MIN_PERCENT / 100; } else { /* 3.5V for non-pd sink */ threshold = AUTO_DISCHARGE_DEFAULT_THRESHOLD_MV;