[PATCH v3 04/12] usb: typec: tcpci: add tcpm_transmit_type to tcpm_pd_receive

RD Babiera
2024-01-08T19:16:37Z

tcpm_pd_receive adds the SOP type as a parameter, and passes it within the
pd_rx_event struct for tcpm_pd_rx_handler to use. For now, the handler
drops all SOP' messages.

Maxim based tcpci drivers are capable of SOP' communication, so process_rx
now takes the SOP type into account and passes the value to
tcpm_pd_receive.

tcpci_set_pd_rx now utilizes the cable_comm_capable flag to determine if
TCPC_RX_DETECT_SOP1 should be added to the bitfield when enabling PD
message reception.

For all other consumers of tcpm_pd_receive, default the new field to
TCPC_TX_SOP.

Signed-off-by: RD Babiera <rdbabiera@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
Changes since v2:
* added reviewed-by tag
---
drivers/usb/typec/tcpm/fusb302.c | 2 +-
.../typec/tcpm/qcom/qcom_pmic_typec_pdphy.c | 2 +-
drivers/usb/typec/tcpm/tcpci.c | 7 +++++--
drivers/usb/typec/tcpm/tcpci_maxim_core.c | 20 ++++++++++++++++---
drivers/usb/typec/tcpm/tcpm.c | 10 +++++++++-
drivers/usb/typec/tcpm/wcove.c | 2 +-
include/linux/usb/tcpci.h | 1 +
include/linux/usb/tcpm.h | 3 ++-
8 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/drivers/usb/typec/tcpm/fusb302.c b/drivers/usb/typec/tcpm/fusb302.c
index bc21006e979c..ef18a448b740 100644
--- a/drivers/usb/typec/tcpm/fusb302.c
+++ b/drivers/usb/typec/tcpm/fusb302.c
@@ -1467,7 +1467,7 @@ static int fusb302_pd_read_message(struct fusb302_chip *chip,
if ((!len) && (pd_header_type_le(msg->header) == PD_CTRL_GOOD_CRC))
tcpm_pd_transmit_complete(chip->tcpm_port, TCPC_TX_SUCCESS);
else
- tcpm_pd_receive(chip->tcpm_port, msg);
+ tcpm_pd_receive(chip->tcpm_port, msg, TCPC_TX_SOP);

return ret;
}
diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c
index 52c81378e36e..a3154085ae32 100644
--- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c
+++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec_pdphy.c
@@ -299,7 +299,7 @@ static void qcom_pmic_typec_pdphy_pd_receive(struct pmic_typec_pdphy *pmic_typec

if (!ret) {
dev_vdbg(dev, "pd_receive: handing %d bytes to tcpm\n", size);
- tcpm_pd_receive(pmic_typec_pdphy->tcpm_port, &msg);
+ tcpm_pd_receive(pmic_typec_pdphy->tcpm_port, &msg, TCPC_TX_SOP);
}
}

diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
index 1ededbcecc09..8ea4ed159a13 100644
--- a/drivers/usb/typec/tcpm/tcpci.c
+++ b/drivers/usb/typec/tcpm/tcpci.c
@@ -445,8 +445,11 @@ static int tcpci_set_pd_rx(struct tcpc_dev *tcpc, bool enable)
unsigned int reg = 0;
int ret;

- if (enable)
+ if (enable) {
reg = TCPC_RX_DETECT_SOP | TCPC_RX_DETECT_HARD_RESET;
+ if (tcpci->data->cable_comm_capable)
+ reg |= TCPC_RX_DETECT_SOP1;
+ }
ret = regmap_write(tcpci->regmap, TCPC_RX_DETECT, reg);
if (ret < 0)
return ret;
@@ -719,7 +722,7 @@ irqreturn_t tcpci_irq(struct tcpci *tcpci)
/* Read complete, clear RX status alert bit */
tcpci_write16(tcpci, TCPC_ALERT, TCPC_ALERT_RX_STATUS);

- tcpm_pd_receive(tcpci->port, &msg);
+ tcpm_pd_receive(tcpci->port, &msg, TCPC_TX_SOP);
}

if (tcpci->data->vbus_vsafe0v && (status & TCPC_ALERT_EXTENDED_STATUS)) {
diff --git a/drivers/usb/typec/tcpm/tcpci_maxim_core.c b/drivers/usb/typec/tcpm/tcpci_maxim_core.c
index 7b2d4e6e52a2..f9f838df43f7 100644
--- a/drivers/usb/typec/tcpm/tcpci_maxim_core.c
+++ b/drivers/usb/typec/tcpm/tcpci_maxim_core.c
@@ -128,6 +128,7 @@ static void process_rx(struct max_tcpci_chip *chip, u16 status)
u8 count, frame_type, rx_buf[TCPC_RECEIVE_BUFFER_LEN];
int ret, payload_index;
u8 *rx_buf_ptr;
+ enum tcpm_transmit_type rx_type;

/*
* READABLE_BYTE_COUNT: Indicates the number of bytes in the RX_BUF_BYTE_x registers
@@ -143,10 +144,23 @@ static void process_rx(struct max_tcpci_chip *chip, u16 status)
count = rx_buf[TCPC_RECEIVE_BUFFER_COUNT_OFFSET];
frame_type = rx_buf[TCPC_RECEIVE_BUFFER_FRAME_TYPE_OFFSET];

- if (count == 0 || frame_type != TCPC_RX_BUF_FRAME_TYPE_SOP) {
+ switch (frame_type) {
+ case TCPC_RX_BUF_FRAME_TYPE_SOP1:
+ rx_type = TCPC_TX_SOP_PRIME;
+ break;
+ case TCPC_RX_BUF_FRAME_TYPE_SOP:
+ rx_type = TCPC_TX_SOP;
+ break;
+ default:
+ rx_type = TCPC_TX_SOP;
+ break;
+ }
+
+ if (count == 0 || (frame_type != TCPC_RX_BUF_FRAME_TYPE_SOP &&
+ frame_type != TCPC_RX_BUF_FRAME_TYPE_SOP1)) {
max_tcpci_write16(chip, TCPC_ALERT, TCPC_ALERT_RX_STATUS);
dev_err(chip->dev, "%s\n", count == 0 ? "error: count is 0" :
- "error frame_type is not SOP");
+ "error frame_type is not SOP/SOP'");
return;
}

@@ -183,7 +197,7 @@ static void process_rx(struct max_tcpci_chip *chip, u16 status)
if (ret < 0)
return;

- tcpm_pd_receive(chip->port, &msg);
+ tcpm_pd_receive(chip->port, &msg, rx_type);
}

static int max_tcpci_set_vbus(struct tcpci *tcpci, struct tcpci_data *tdata, bool source, bool sink)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 5945e3a2b0f7..ff0fcf560c88 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -518,6 +518,7 @@ struct pd_rx_event {
struct kthread_work work;
struct tcpm_port *port;
struct pd_message msg;
+ enum tcpm_transmit_type rx_sop_type;
};

static const char * const pd_rev[] = {
@@ -2981,12 +2982,17 @@ static void tcpm_pd_rx_handler(struct kthread_work *work)
const struct pd_message *msg = &event->msg;
unsigned int cnt = pd_header_cnt_le(msg->header);
struct tcpm_port *port = event->port;
+ enum tcpm_transmit_type rx_sop_type = event->rx_sop_type;

mutex_lock(&port->lock);

tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
port->attached);

+ /* Ignore SOP' for now */
+ if (rx_sop_type == TCPC_TX_SOP_PRIME)
+ goto done;
+
if (port->attached) {
enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
unsigned int msgid = pd_header_msgid_le(msg->header);
@@ -3028,7 +3034,8 @@ static void tcpm_pd_rx_handler(struct kthread_work *work)
kfree(event);
}

-void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
+void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg,
+ enum tcpm_transmit_type rx_sop_type)
{
struct pd_rx_event *event;

@@ -3038,6 +3045,7 @@ void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)

kthread_init_work(&event->work, tcpm_pd_rx_handler);
event->port = port;
+ event->rx_sop_type = rx_sop_type;
memcpy(&event->msg, msg, sizeof(*msg));
kthread_queue_work(port->wq, &event->work);
}
diff --git a/drivers/usb/typec/tcpm/wcove.c b/drivers/usb/typec/tcpm/wcove.c
index 87d4abde0ea2..cf719307b3f6 100644
--- a/drivers/usb/typec/tcpm/wcove.c
+++ b/drivers/usb/typec/tcpm/wcove.c
@@ -535,7 +535,7 @@ static irqreturn_t wcove_typec_irq(int irq, void *data)
goto err;
}

- tcpm_pd_receive(wcove->tcpm, &msg);
+ tcpm_pd_receive(wcove->tcpm, &msg, TCPC_TX_SOP);

ret = regmap_read(wcove->regmap, USBC_RXSTATUS,
&status);
diff --git a/include/linux/usb/tcpci.h b/include/linux/usb/tcpci.h
index 1d0b849defd0..9ed6d62c9c5f 100644
--- a/include/linux/usb/tcpci.h
+++ b/include/linux/usb/tcpci.h
@@ -145,6 +145,7 @@
#define TCPC_RX_BYTE_CNT 0x30
#define TCPC_RX_BUF_FRAME_TYPE 0x31
#define TCPC_RX_BUF_FRAME_TYPE_SOP 0
+#define TCPC_RX_BUF_FRAME_TYPE_SOP1 1
#define TCPC_RX_HDR 0x32
#define TCPC_RX_DATA 0x34 /* through 0x4f */

diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
index 430fa3ec69bb..41d1ac9c8bbf 100644
--- a/include/linux/usb/tcpm.h
+++ b/include/linux/usb/tcpm.h
@@ -170,7 +170,8 @@ void tcpm_cc_change(struct tcpm_port *port);
void tcpm_sink_frs(struct tcpm_port *port);
void tcpm_sourcing_vbus(struct tcpm_port *port);
void tcpm_pd_receive(struct tcpm_port *port,
- const struct pd_message *msg);
+ const struct pd_message *msg,
+ enum tcpm_transmit_type rx_sop_type);
void tcpm_pd_transmit_complete(struct tcpm_port *port,
enum tcpm_transmit_status status);
void tcpm_pd_hard_reset(struct tcpm_port *port);
--
2.43.0.472.g3155946c3a-goog