usb: typec: tcpm: Pass down negotiated rev to update retry count

nRetryCount was updated from 3 to 2 between PD2.0 and PD3.0 spec.
nRetryCount in "Table 6-34 Counter parameters" of the PD 2.0
spec is set to 3, whereas, nRetryCount in "Table 6-59 Counter
parameters" is set to 2.

Pass down negotiated rev in pd_transmit so that low level chip
drivers can update the retry count accordingly before attempting
packet transmission.

This helps in passing "TEST.PD.PORT.ALL.02" of the
"Power Delivery Merged" test suite which was initially failing
with "The UUT did not retransmit the message nReryCount times"

In fusb302 & tcpci drivers, by default the driver sets the retry
count to 3 (Default for PD 2.0). Update this to 2,
if the negotiated rev is PD 3.0.

In wcove, since the retry count is intentionally set to max, leaving
it as is.

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/20201202031733.647808-1-badhri@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/tcpm/fusb302.c

@@ -343,12 +343,11 @@ static int fusb302_sw_reset(struct fusb302_chip *chip)
 	return ret;
 }
 
-static int fusb302_enable_tx_auto_retries(struct fusb302_chip *chip)
+static int fusb302_enable_tx_auto_retries(struct fusb302_chip *chip, u8 retry_count)
 {
 	int ret = 0;
 
-	ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3,
-				   FUSB_REG_CONTROL3_N_RETRIES_3 |
+	ret = fusb302_i2c_set_bits(chip, FUSB_REG_CONTROL3, retry_count |
 				   FUSB_REG_CONTROL3_AUTO_RETRY);
 
 	return ret;
@@ -399,7 +398,7 @@ static int tcpm_init(struct tcpc_dev *dev)
 	ret = fusb302_sw_reset(chip);
 	if (ret < 0)
 		return ret;
-	ret = fusb302_enable_tx_auto_retries(chip);
+	ret = fusb302_enable_tx_auto_retries(chip, FUSB_REG_CONTROL3_N_RETRIES_3);
 	if (ret < 0)
 		return ret;
 	ret = fusb302_init_interrupt(chip);
@@ -1017,7 +1016,7 @@ static const char * const transmit_type_name[] = {
 };
 
 static int tcpm_pd_transmit(struct tcpc_dev *dev, enum tcpm_transmit_type type,
-			    const struct pd_message *msg)
+			    const struct pd_message *msg, unsigned int negotiated_rev)
 {
 	struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
 						 tcpc_dev);
@@ -1026,6 +1025,13 @@ static int tcpm_pd_transmit(struct tcpc_dev *dev, enum tcpm_transmit_type type,
 	mutex_lock(&chip->lock);
 	switch (type) {
 	case TCPC_TX_SOP:
+		/* nRetryCount 3 in P2.0 spec, whereas 2 in PD3.0 spec */
+		ret = fusb302_enable_tx_auto_retries(chip, negotiated_rev > PD_REV20 ?
+						     FUSB_REG_CONTROL3_N_RETRIES_2 :
+						     FUSB_REG_CONTROL3_N_RETRIES_3);
+		if (ret < 0)
+			fusb302_log(chip, "Cannot update retry count ret=%d", ret);
+
 		ret = fusb302_pd_send_message(chip, msg);
 		if (ret < 0)
 			fusb302_log(chip,

drivers/usb/typec/tcpm/tcpci.c

@@ -18,7 +18,8 @@
 
 #include "tcpci.h"
 
-#define	PD_RETRY_COUNT				3
+#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
@@ -447,9 +448,8 @@ static int tcpci_set_vbus(struct tcpc_dev *tcpc, bool source, bool sink)
 	return 0;
 }
 
-static int tcpci_pd_transmit(struct tcpc_dev *tcpc,
-			     enum tcpm_transmit_type type,
-			     const struct pd_message *msg)
+static int tcpci_pd_transmit(struct tcpc_dev *tcpc, enum tcpm_transmit_type type,
+			     const struct pd_message *msg, unsigned int negotiated_rev)
 {
 	struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
 	u16 header = msg ? le16_to_cpu(msg->header) : 0;
@@ -497,7 +497,9 @@ static int tcpci_pd_transmit(struct tcpc_dev *tcpc,
 		}
 	}
 
-	reg = (PD_RETRY_COUNT << TCPC_TRANSMIT_RETRY_SHIFT) | (type << TCPC_TRANSMIT_TYPE_SHIFT);
+	/* nRetryCount is 3 in PD2.0 spec where 2 in PD3.0 spec */
+	reg = ((negotiated_rev > PD_REV20 ? PD_RETRY_COUNT_3_0_OR_HIGHER : PD_RETRY_COUNT_DEFAULT)
+	       << TCPC_TRANSMIT_RETRY_SHIFT) | (type << TCPC_TRANSMIT_TYPE_SHIFT);
 	ret = regmap_write(tcpci->regmap, TCPC_TRANSMIT, reg);
 	if (ret < 0)
 		return ret;

drivers/usb/typec/tcpm/tcpm.c

@@ -667,7 +667,7 @@ static int tcpm_pd_transmit(struct tcpm_port *port,
 		tcpm_log(port, "PD TX, type: %#x", type);
 
 	reinit_completion(&port->tx_complete);
-	ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
+	ret = port->tcpc->pd_transmit(port->tcpc, type, msg, port->negotiated_rev);
 	if (ret < 0)
 		return ret;
 

drivers/usb/typec/tcpm/wcove.c

@@ -356,7 +356,8 @@ static int wcove_set_pd_rx(struct tcpc_dev *tcpc, bool on)
 
 static int wcove_pd_transmit(struct tcpc_dev *tcpc,
 			     enum tcpm_transmit_type type,
-			     const struct pd_message *msg)
+			     const struct pd_message *msg,
+			     unsigned int negotiated_rev)
 {
 	struct wcove_typec *wcove = tcpc_to_wcove(tcpc);
 	unsigned int info = 0;

include/linux/usb/tcpm.h

@@ -121,7 +121,7 @@ struct tcpc_dev {
 			      enum typec_cc_status cc);
 	int (*try_role)(struct tcpc_dev *dev, int role);
 	int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type type,
-			   const struct pd_message *msg);
+			   const struct pd_message *msg, unsigned int negotiated_rev);
 	int (*set_bist_data)(struct tcpc_dev *dev, bool on);
 	int (*enable_frs)(struct tcpc_dev *dev, bool enable);
 	void (*frs_sourcing_vbus)(struct tcpc_dev *dev);