Re: [PATCH v2 3/4] usb: typec: tcpci: clear the fault status bit

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On 5/4/23 07:27, Marco Felsch wrote:
On 23-05-04, Guenter Roeck wrote:
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 ?

Sry. I don't get this.


instead of "reseted" which isn't really a word.

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 ?

Sure, thanks.

corresponding

Of course!

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, &reg);

Needs error check.

I will add this.

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 ?

According the spec the bit must be cleared before the TCPC_ALERT is
cleared. Of course the vendor-init can (re-)trigger the bit, therefore
we should move behind the vendor init and right before the TCPC_ALERT
clear.

Also, why not just write the bit unconditionally, similar
to TCPC_ALERT ?

Thought about this too.. I will change it in the v3.

Thanks for the feedback,
   Marco


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







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