MLK-17092 staging: typec: enable vbus voltage low alarm

We use vbus low voltage alarm to start vbus discharge to meet
timing requirement on turning off vbus for power swap from
source to sink, per type-C port controller spec(tcpci), the
Voltage Alarms Power status reporting is disabled by default,
so we need enable it at tcpci init.

Acked-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Li Jun <jun.li@nxp.com>

diff --git a/drivers/staging/typec/tcpci.c b/drivers/staging/typec/tcpci.c
index 530a05b..4a934b5 100644 (file)
--- a/drivers/staging/typec/tcpci.c
+++ b/drivers/staging/typec/tcpci.c
@@ -516,6 +516,11 @@ static int tcpci_init(struct tcpc_dev *tcpc)
        if (ret < 0)
                return ret;
 
+       /* Enable Voltage Alarms Power status reporting */
+       regmap_read(tcpci->regmap, TCPC_POWER_CTRL, &reg);
+       reg &= ~TCPC_POWER_CTRL_DIS_VOL_ALARM;
+       ret = regmap_write(tcpci->regmap, TCPC_POWER_CTRL, reg);
+
        reg = TCPC_ALERT_TX_SUCCESS | TCPC_ALERT_TX_FAILED |
                TCPC_ALERT_TX_DISCARDED | TCPC_ALERT_RX_STATUS |
                TCPC_ALERT_RX_HARD_RST | TCPC_ALERT_CC_STATUS |

diff --git a/drivers/staging/typec/tcpci.h b/drivers/staging/typec/tcpci.h
index 75a9666..8b261a4 100644 (file)
--- a/drivers/staging/typec/tcpci.h
+++ b/drivers/staging/typec/tcpci.h
@@ -69,6 +69,7 @@
 #define TCPC_POWER_CTRL                        0x1c
 #define TCPC_POWER_CTRL_VCONN_ENABLE   BIT(0)
 #define TCPC_POWER_CTRL_FORCEDISCH     BIT(2)
+#define TCPC_POWER_CTRL_DIS_VOL_ALARM  BIT(5)
 
 #define TCPC_CC_STATUS                 0x1d
 #define TCPC_CC_STATUS_TERM            BIT(4)