On 5/4/23 06:46, Marco Felsch wrote:
According the "USB Type-C Port Controller Interface Specification v2.0"
the TCPC sets the fault status register bit-7
(AllRegistersResetToDefault) once the registers have been reseted to
cleared ? set ?
their default values.
This triggers an alert(-irq) on PTN5110 devices albeit we do mask the
fault-irq. Fix this gernally by writing a one to the correspondig
generically ?
corresponding
bit-7.
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
---
drivers/usb/typec/tcpm/tcpci.c | 5 +++++
include/linux/usb/tcpci.h | 1 +
2 files changed, 6 insertions(+)
diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
index 8da23240afbe..15632d023e4c 100644
--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -602,6 +602,11 @@ static int tcpci_init(struct tcpc_dev *tcpc)
if (time_after(jiffies, timeout))
return -ETIMEDOUT;
+ regmap_read(tcpci->regmap, TCPC_FAULT_STATUS, ®);
Needs error check.
Also, I am not sure if this is the correct place for this code. The alert
status is cleared after vendor initialization. Should the same be done
here ? Also, why not just write the bit unconditionally, similar
to TCPC_ALERT ?
Thanks,
Guenter
+ if (reg & TCPC_FAULT_STATUS_ALL_REG_RST_TO_DEFAULT)
+ tcpci_write16(tcpci, TCPC_FAULT_STATUS,
+ TCPC_FAULT_STATUS_ALL_REG_RST_TO_DEFAULT);
+
/* Handle vendor init */
if (tcpci->data->init) {
ret = tcpci->data->init(tcpci, tcpci->data);
diff --git a/include/linux/usb/tcpci.h b/include/linux/usb/tcpci.h
index 85e95a3251d3..83376473ac76 100644
--- a/include/linux/usb/tcpci.h
+++ b/include/linux/usb/tcpci.h
@@ -103,6 +103,7 @@
#define TCPC_POWER_STATUS_SINKING_VBUS BIT(0)
#define TCPC_FAULT_STATUS 0x1f
+#define TCPC_FAULT_STATUS_ALL_REG_RST_TO_DEFAULT BIT(7)
#define TCPC_ALERT_EXTENDED 0x21
