From patchwork Thu Dec 7 09:07:33 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: RD Babiera X-Patchwork-Id: 13483003 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 511D8328C8 for ; Thu, 7 Dec 2023 09:08:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--rdbabiera.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ExLoIcBN" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-5d98fde753eso6626647b3.2 for ; Thu, 07 Dec 2023 01:08:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1701940081; x=1702544881; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=MuwO1i75ULAaVoZs1xyVi1Y8jYwy5X8JcJl1W/tPnh8=; b=ExLoIcBNSiNk0vdCV1G66BOipE6NCC5qlDr7zZReyB/DrvvTnzJiXvyMbPYihT2KVS PvfzzxtRIY/Ay2qCdMoiYASTC4GwRuYquGTz9sbboWH1a+cVr5upHNrdR1cluCw0Lz8S N8GPZhaW4QyWQzONejFRJoOuQlpOEwILg/1TPN56xES3PATNQGtRMaE+o+1Y/54Q1yjx rrmCOUb90EJYSxIx4vQ+Yftx5ZgApLYgGrvc9vPEIFxBvgDgpk3uVKQdaUreqLX/qUEG OMq91TPq7iIg6OqkvccBRu0+AY0C+X3sSzxnpfuv1Z/k++rL+1aCDt35PA0hBh6Y+4Yn pXQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701940081; x=1702544881; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=MuwO1i75ULAaVoZs1xyVi1Y8jYwy5X8JcJl1W/tPnh8=; b=OQxNfCRwerlvEY29TqHFg1oBpuEQqs3Nn9DFm8IRtikXF77pd12sBwIXMUmPqOP78R u1TNWYaZUiTi/qgxN/MBn1M96W49T8Buu1EORAeDh4SWmW1DZm+lJymz883kcWZd0TgH tKOg+g1SpmhRMKNHaiNkx3KE2j5f/MmOm8iFPm+UgI3m+KFsUk0RD6VlBJ1/hp3PZBNc l+zl2tB1Bz+8rTB6ODABt2Loz+JY3ywyBN1MwQAuz0dUOGQxI67chzDAfqKNOY3d4w6W wNjMCGOOTcX0vwKvjMs5zubpJjjE8jXkhhCwvnz2lJJv9InugwQ+KZfQ4vvFg70/baMx y9RA== X-Gm-Message-State: AOJu0YzcRVvoT10JQB+D5POQb9yLPwFpqHLu93ZXr2+re+f646qXg/6I yWSn4ltWCgVRrnLvbQo4tzXsbTN2cpr9JUU= X-Google-Smtp-Source: AGHT+IHsWlxxa/LP64vEBaMBpQ5GH1v+h1RJAoSuyJIrlkHzy7oBcam9q6nEHFOhWQKQ4PXh5iAneho56WSnQ10= X-Received: from rdbabiera.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:18a8]) (user=rdbabiera job=sendgmr) by 2002:a05:690c:408b:b0:5d3:d6c3:dc6 with SMTP id gb11-20020a05690c408b00b005d3d6c30dc6mr30642ywb.7.1701940081217; Thu, 07 Dec 2023 01:08:01 -0800 (PST) Date: Thu, 7 Dec 2023 09:07:33 +0000 In-Reply-To: <20231207090738.15721-12-rdbabiera@google.com> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20231207090738.15721-12-rdbabiera@google.com> X-Developer-Key: i=rdbabiera@google.com; a=openpgp; fpr=639A331F1A21D691815CE090416E17CA2BBBD5C8 X-Developer-Signature: v=1; a=openpgp-sha256; l=9747; i=rdbabiera@google.com; h=from:subject; bh=aiPdmHgbqxhZVP1Ijw5Y52oNJyZpFyMwwjjUZtB41UU=; b=owGbwMvMwCFW0bfok0KS4TbG02pJDKmF3dGvZOxvzg/3Lwg/FT6td69RcoFCTlnm5n3JK1lEX v2I//C8o5SFQYyDQVZMkUXXP8/gxpXULXM4a4xh5rAygQxh4OIUgIksL2JkODCjOGdds0xS68SN N6Wu2fB6mko17AvI2v7b/uOunLsy1YwM85IWaGskPUgWzOEUsPr2t2O+83bn8gshjlbb1S7JSJ1 lBwA= X-Mailer: git-send-email 2.43.0.rc2.451.g8631bc7472-goog Message-ID: <20231207090738.15721-14-rdbabiera@google.com> Subject: [PATCH v1 02/10] usb: typec: tcpci: enable reception of SOP' messages From: RD Babiera To: heikki.krogerus@linux.intel.com, linux@roeck-us.net, gregkh@linuxfoundation.org, pmalani@chromium.org, bleung@chromium.org, chrome-platform@lists.linux.dev, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Cc: badhri@google.com, tzungbi@kernel.org, utkarsh.h.patel@intel.com, andriy.shevchenko@linux.intel.com, RD Babiera Add cable_comm_capable to tcpci_data for tcpci drivers to indicate that the port tcpc is capable of communicating to cables over SOP. A corresponding tcpci callback tcpci_cable_comm_capable returns this value. The tcpm will primarily use this in later patches to determine if the port can transmit and receive SOP' messages. 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. In the tcpci, add a definition for TCPC_RX_BUF_FRAME_TYPE_SOP1 as described in the Type C Port Controller Interface Specification Section 4.4.14. Maxim based tcpci drivers are capable of SOP' communication, so the cable_comm_capable flag is set to true. process_rx now takes the SOP' into account and passes the value to tcpm_pd_receive. 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. Signed-off-by: RD Babiera --- drivers/usb/typec/tcpm/tcpci.c | 15 +++++++++++++-- drivers/usb/typec/tcpm/tcpci_maxim_core.c | 20 +++++++++++++++++--- drivers/usb/typec/tcpm/tcpm.c | 10 +++++++++- include/linux/usb/tcpci.h | 4 ++++ include/linux/usb/tcpm.h | 7 ++++++- 5 files changed, 49 insertions(+), 7 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c index 0ee3e6e29bb1..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; @@ -584,6 +587,13 @@ static int tcpci_pd_transmit(struct tcpc_dev *tcpc, enum tcpm_transmit_type type return 0; } +static bool tcpci_cable_comm_capable(struct tcpc_dev *tcpc) +{ + struct tcpci *tcpci = tcpc_to_tcpci(tcpc); + + return tcpci->data->cable_comm_capable; +} + static int tcpci_init(struct tcpc_dev *tcpc) { struct tcpci *tcpci = tcpc_to_tcpci(tcpc); @@ -712,7 +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)) { @@ -793,6 +803,7 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data) tcpci->tcpc.enable_frs = tcpci_enable_frs; tcpci->tcpc.frs_sourcing_vbus = tcpci_frs_sourcing_vbus; tcpci->tcpc.set_partner_usb_comm_capable = tcpci_set_partner_usb_comm_capable; + tcpci->tcpc.cable_comm_capable = tcpci_cable_comm_capable; if (tcpci->data->check_contaminant) tcpci->tcpc.check_contaminant = tcpci_check_contaminant; diff --git a/drivers/usb/typec/tcpm/tcpci_maxim_core.c b/drivers/usb/typec/tcpm/tcpci_maxim_core.c index 7fb966fd639b..548c583ab1a1 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 @@ -142,11 +143,23 @@ 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]; + 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) { + 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 +196,7 @@ 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) @@ -478,6 +491,7 @@ static int max_tcpci_probe(struct i2c_client *client) chip->data.vbus_vsafe0v = true; chip->data.set_partner_usb_comm_capable = max_tcpci_set_partner_usb_comm_capable; chip->data.check_contaminant = max_tcpci_check_contaminant; + chip->data.cable_comm_capable = true; max_tcpci_init_regs(chip); chip->tcpci = tcpci_register_port(chip->dev, &chip->data); diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 795e3145b0c2..5f9a4691f626 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[] = { @@ -2972,6 +2973,7 @@ 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); @@ -2982,6 +2984,10 @@ static void tcpm_pd_rx_handler(struct kthread_work *work) enum pd_ctrl_msg_type type = pd_header_type_le(msg->header); unsigned int msgid = pd_header_msgid_le(msg->header); + /* Ignore SOP' for now */ + if (rx_sop_type == TCPC_TX_SOP_PRIME) + goto done; + /* * USB PD standard, 6.6.1.2: * "... if MessageID value in a received Message is the @@ -3019,7 +3025,8 @@ 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; @@ -3029,6 +3036,7 @@ 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/include/linux/usb/tcpci.h b/include/linux/usb/tcpci.h index 467e8045e9f8..62c518cca934 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 */ @@ -188,6 +189,8 @@ struct tcpci; * Optional; Enables TCPC to autonously discharge vbus on disconnect. * @vbus_vsafe0v: * optional; Set when TCPC can detect whether vbus is at VSAFE0V. + * @cable_comm_capable + * optional; Set when TCPC can communicate with cable plugs over SOP' * @set_partner_usb_comm_capable: * Optional; The USB Communications Capable bit indicates if port * partner is capable of communication over the USB data lines @@ -204,6 +207,7 @@ struct tcpci_data { unsigned char TX_BUF_BYTE_x_hidden:1; unsigned char auto_discharge_disconnect:1; unsigned char vbus_vsafe0v:1; + unsigned char cable_comm_capable:1; int (*init)(struct tcpci *tcpci, struct tcpci_data *data); int (*set_vconn)(struct tcpci *tcpci, struct tcpci_data *data, diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h index 65fac5e1f317..41d1ac9c8bbf 100644 --- a/include/linux/usb/tcpm.h +++ b/include/linux/usb/tcpm.h @@ -119,6 +119,9 @@ enum tcpm_transmit_type { * at the end of the deboumce period or when the port is still * toggling. Chip level drivers are expected to check for contaminant * and call tcpm_clean_port when the port is clean. + * @cable_comm_capable + * Optional; Returns whether cable communication over SOP' is supported + * by the tcpc */ struct tcpc_dev { struct fwnode_handle *fwnode; @@ -154,6 +157,7 @@ struct tcpc_dev { bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev); void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable); void (*check_contaminant)(struct tcpc_dev *dev); + bool (*cable_comm_capable)(struct tcpc_dev *dev); }; struct tcpm_port; @@ -166,7 +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);