Re: [PATCH v2 04/12] usb: typec: tcpci: add tcpm_transmit_type to tcpm_pd_receive

From: Heikki Krogerus
Date: Tue Dec 19 2023 - 08:59:19 EST

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On Thu, Dec 14, 2023 at 11:08:48PM +0000, RD Babiera wrote:
> 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@xxxxxxxxxx>

Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>

> ---
> 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 ff67553b6932..b05325dcd7ac 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -506,6 +506,7 @@ 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[] = {
> @@ -2969,12 +2970,17 @@ 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);
> @@ -3016,7 +3022,8 @@ 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;
>
> @@ -3026,6 +3033,7 @@ 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

--
heikki

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