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[104.57.184.186]) by smtp.gmail.com with ESMTPSA id l6-20020a056871068600b0011c25975c1dsm112382oao.25.2022.08.17.20.12.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Aug 2022 20:12:48 -0700 (PDT) From: Bjorn Andersson To: Andy Gross , Bjorn Andersson , Konrad Dybcio Cc: Rob Herring , Krzysztof Kozlowski , Sebastian Reichel , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Subject: [PATCH 3/4] soc: qcom: pmic_glink: Introduce altmode support Date: Wed, 17 Aug 2022 20:15:11 -0700 Message-Id: <20220818031512.319310-4-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220818031512.319310-1-bjorn.andersson@linaro.org> References: <20220818031512.319310-1-bjorn.andersson@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org With the PMIC GLINK service, the host OS subscribes to USB-C altmode messages, which are sent by the firmware to notify the host OS about state updates and HPD interrupts. The pmic_glink_altmode driver registers for these notifications and propagates the notifications as typec_mux, typec_switch and DRM OOB notifications as necessary to implement DisplayPort altmode support. Signed-off-by: Bjorn Andersson --- drivers/soc/qcom/Makefile | 1 + drivers/soc/qcom/pmic_glink_altmode.c | 477 ++++++++++++++++++++++++++ 2 files changed, 478 insertions(+) create mode 100644 drivers/soc/qcom/pmic_glink_altmode.c diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile index fbbd1231e554..8d62a17863c1 100644 --- a/drivers/soc/qcom/Makefile +++ b/drivers/soc/qcom/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o obj-$(CONFIG_QCOM_OCMEM) += ocmem.o obj-$(CONFIG_QCOM_PDR_HELPERS) += pdr_interface.o obj-$(CONFIG_QCOM_PMIC_GLINK) += pmic_glink.o +obj-$(CONFIG_QCOM_PMIC_GLINK) += pmic_glink_altmode.o obj-$(CONFIG_QCOM_QMI_HELPERS) += qmi_helpers.o qmi_helpers-y += qmi_encdec.o qmi_interface.o obj-$(CONFIG_QCOM_RMTFS_MEM) += rmtfs_mem.o diff --git a/drivers/soc/qcom/pmic_glink_altmode.c b/drivers/soc/qcom/pmic_glink_altmode.c new file mode 100644 index 000000000000..8d2d563cb756 --- /dev/null +++ b/drivers/soc/qcom/pmic_glink_altmode.c @@ -0,0 +1,477 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2019-2020, The Linux Foundation. All rights reserved. + * Copyright (c) 2022, Linaro Ltd + */ +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include + +#define PMIC_GLINK_MAX_PORTS 2 + +#define USBC_SC8180X_NOTIFY_IND 0x13 +#define USBC_CMD_WRITE_REQ 0x15 +#define USBC_NOTIFY_IND 0x16 + +#define ALTMODE_PAN_EN 0x10 +#define ALTMODE_PAN_ACK 0x11 + +struct usbc_write_req { + struct pmic_glink_hdr hdr; + __le32 cmd; + __le32 arg; + __le32 reserved; +}; + +#define NOTIFY_PAYLOAD_SIZE 16 +struct usbc_notify { + struct pmic_glink_hdr hdr; + char payload[NOTIFY_PAYLOAD_SIZE]; + u32 reserved; +}; + +struct usbc_sc8180x_notify { + struct pmic_glink_hdr hdr; + __le32 notification; + __le32 reserved[2]; +}; + +enum pmic_glink_altmode_pin_assignment { + DPAM_HPD_OUT, + DPAM_HPD_A, + DPAM_HPD_B, + DPAM_HPD_C, + DPAM_HPD_D, + DPAM_HPD_E, + DPAM_HPD_F, +}; + +struct pmic_glink_altmode; + +#define work_to_altmode_port(w) container_of((w), struct pmic_glink_altmode_port, work) + +struct pmic_glink_altmode_port { + struct pmic_glink_altmode *altmode; + unsigned int index; + + struct typec_switch *typec_switch; + struct typec_mux *typec_mux; + struct typec_mux_state state; + struct typec_altmode dp_alt; + + struct work_struct work; + + struct drm_bridge bridge; + + enum typec_orientation orientation; + u16 svid; + u8 dp_data; + u8 mode; + u8 hpd_state; + u8 hpd_irq; +}; + +#define work_to_altmode(w) container_of((w), struct pmic_glink_altmode, enable_work) + +struct pmic_glink_altmode { + struct device *dev; + + unsigned int owner_id; + + /* To synchronize WRITE_REQ acks */ + struct mutex lock; + + struct completion pan_ack; + struct pmic_glink_client *client; + + struct work_struct enable_work; + + struct pmic_glink_altmode_port ports[PMIC_GLINK_MAX_PORTS]; +}; + +static int pmic_glink_altmode_request(struct pmic_glink_altmode *altmode, u32 cmd, u32 arg) +{ + struct usbc_write_req req = {}; + unsigned long left; + int ret; + + /* + * The USBC_CMD_WRITE_REQ ack doesn't identify the request, so wait for + * one ack at a time. + */ + mutex_lock(&altmode->lock); + + req.hdr.owner = cpu_to_le32(altmode->owner_id); + req.hdr.type = cpu_to_le32(PMIC_GLINK_REQ_RESP); + req.hdr.opcode = cpu_to_le32(USBC_CMD_WRITE_REQ); + req.cmd = cpu_to_le32(cmd); + req.arg = cpu_to_le32(arg); + + ret = pmic_glink_send(altmode->client, &req, sizeof(req)); + if (ret) { + dev_err(altmode->dev, "failed to send altmode request: %#x (%d)\n", cmd, ret); + goto out_unlock; + } + + left = wait_for_completion_timeout(&altmode->pan_ack, 5 * HZ); + if (!left) { + dev_err(altmode->dev, "timeout waiting for altmode request ack for: %#x\n", cmd); + ret = -ETIMEDOUT; + } + +out_unlock: + mutex_unlock(&altmode->lock); + return ret; +} + +static void pmic_glink_altmode_enable_dp(struct pmic_glink_altmode *altmode, + struct pmic_glink_altmode_port *port, + u8 mode, bool hpd_state, + bool hpd_irq) +{ + struct typec_displayport_data dp_data = {}; + int ret; + + dp_data.status = DP_STATUS_ENABLED; + if (hpd_state) + dp_data.status |= DP_STATUS_HPD_STATE; + if (hpd_irq) + dp_data.status |= DP_STATUS_IRQ_HPD; + dp_data.conf = DP_CONF_SET_PIN_ASSIGN(mode); + + port->state.alt = &port->dp_alt; + port->state.data = &dp_data; + port->state.mode = TYPEC_MODAL_STATE(mode); + + ret = typec_mux_set(port->typec_mux, &port->state); + if (ret) + dev_err(altmode->dev, "failed to switch mux to DP\n"); +} + +static void pmic_glink_altmode_enable_usb(struct pmic_glink_altmode *altmode, + struct pmic_glink_altmode_port *port) +{ + int ret; + + port->state.alt = NULL; + port->state.data = NULL; + port->state.mode = TYPEC_STATE_USB; + + ret = typec_mux_set(port->typec_mux, &port->state); + if (ret) + dev_err(altmode->dev, "failed to switch mux to USB\n"); +} + +static void pmic_glink_altmode_worker(struct work_struct *work) +{ + struct pmic_glink_altmode_port *alt_port = work_to_altmode_port(work); + struct pmic_glink_altmode *altmode = alt_port->altmode; + + typec_switch_set(alt_port->typec_switch, alt_port->orientation); + + if (alt_port->svid == USB_TYPEC_DP_SID) + pmic_glink_altmode_enable_dp(altmode, alt_port, alt_port->mode, + alt_port->hpd_state, alt_port->hpd_irq); + else + pmic_glink_altmode_enable_usb(altmode, alt_port); + + if (alt_port->hpd_state) + drm_bridge_hpd_notify(&alt_port->bridge, connector_status_connected); + else + drm_bridge_hpd_notify(&alt_port->bridge, connector_status_disconnected); + + pmic_glink_altmode_request(altmode, ALTMODE_PAN_ACK, alt_port->index); +}; + +static enum typec_orientation pmic_glink_altmode_orientation(unsigned int orientation) +{ + if (orientation == 0) + return TYPEC_ORIENTATION_NORMAL; + else if (orientation == 1) + return TYPEC_ORIENTATION_REVERSE; + else + return TYPEC_ORIENTATION_NONE; +} + +#define SC8180X_PORT_MASK 0x000000ff +#define SC8180X_ORIENTATION_MASK 0x0000ff00 +#define SC8180X_MUX_MASK 0x00ff0000 +#define SC8180X_MODE_MASK 0x3f000000 +#define SC8180X_HPD_STATE_MASK 0x40000000 +#define SC8180X_HPD_IRQ_MASK 0x80000000 + +static void pmic_glink_altmode_sc8180xp_notify(struct pmic_glink_altmode *altmode, + const void *data, size_t len) +{ + struct pmic_glink_altmode_port *alt_port; + const struct usbc_sc8180x_notify *msg; + u32 notification; + u8 orientation; + u8 hpd_state; + u8 hpd_irq; + u16 svid; + u8 port; + u8 mode; + u8 mux; + + if (len != sizeof(*msg)) { + dev_warn(altmode->dev, "invalid length of USBC_NOTIFY indication: %zd\n", len); + return; + } + + msg = data; + notification = le32_to_cpu(msg->notification); + port = FIELD_GET(SC8180X_PORT_MASK, notification); + orientation = FIELD_GET(SC8180X_ORIENTATION_MASK, notification); + mux = FIELD_GET(SC8180X_MUX_MASK, notification); + mode = FIELD_GET(SC8180X_MODE_MASK, notification); + hpd_state = FIELD_GET(SC8180X_HPD_STATE_MASK, notification); + hpd_irq = FIELD_GET(SC8180X_HPD_IRQ_MASK, notification); + + svid = mux == 2 ? USB_TYPEC_DP_SID : 0; + + if (!altmode->ports[port].altmode) { + dev_dbg(altmode->dev, "notification on undefined port %d\n", port); + return; + } + + alt_port = &altmode->ports[port]; + alt_port->orientation = pmic_glink_altmode_orientation(orientation); + alt_port->svid = mux == 2 ? USB_TYPEC_DP_SID : 0; + alt_port->mode = mode; + alt_port->hpd_state = hpd_state; + alt_port->hpd_irq = hpd_irq; + schedule_work(&alt_port->work); +} + +#define SC8280XP_DPAM_MASK 0x3f +#define SC8280XP_HPD_STATE_MASK BIT(6) +#define SC8280XP_HPD_IRQ_MASK BIT(7) + +static void pmic_glink_altmode_sc8280xp_notify(struct pmic_glink_altmode *altmode, + u16 svid, const void *data, size_t len) +{ + struct pmic_glink_altmode_port *alt_port; + const struct usbc_notify *notify; + u8 orientation; + u8 hpd_state; + u8 hpd_irq; + u8 mode; + u8 port; + + if (len != sizeof(*notify)) { + dev_warn(altmode->dev, "invalid length USBC_NOTIFY_IND: %zd\n", + len); + return; + } + + notify = data; + + port = notify->payload[0]; + orientation = notify->payload[1]; + mode = FIELD_GET(SC8280XP_DPAM_MASK, notify->payload[8]) - DPAM_HPD_A; + hpd_state = FIELD_GET(SC8280XP_HPD_STATE_MASK, notify->payload[8]); + hpd_irq = FIELD_GET(SC8280XP_HPD_IRQ_MASK, notify->payload[8]); + + if (!altmode->ports[port].altmode) { + dev_dbg(altmode->dev, "notification on undefined port %d\n", port); + return; + } + + alt_port = &altmode->ports[port]; + alt_port->orientation = pmic_glink_altmode_orientation(orientation); + alt_port->svid = svid; + alt_port->mode = mode; + alt_port->hpd_state = hpd_state; + alt_port->hpd_irq = hpd_irq; + schedule_work(&alt_port->work); +} + +static void pmic_glink_altmode_callback(const void *data, size_t len, void *priv) +{ + struct pmic_glink_altmode *altmode = priv; + const struct pmic_glink_hdr *hdr = data; + u16 opcode; + u16 svid; + + opcode = le32_to_cpu(hdr->opcode) & 0xff; + svid = le32_to_cpu(hdr->opcode) >> 16; + + switch (opcode) { + case USBC_CMD_WRITE_REQ: + complete(&altmode->pan_ack); + break; + case USBC_NOTIFY_IND: + pmic_glink_altmode_sc8280xp_notify(altmode, svid, data, len); + break; + case USBC_SC8180X_NOTIFY_IND: + pmic_glink_altmode_sc8180xp_notify(altmode, data, len); + break; + } +} + +static int pmic_glink_altmode_attach(struct drm_bridge *bridge, + enum drm_bridge_attach_flags flags) +{ + return flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR ? 0 : -EINVAL; +} + +static const struct drm_bridge_funcs pmic_glink_altmode_bridge_funcs = { + .attach = pmic_glink_altmode_attach, +}; + +static void pmic_glink_altmode_put_mux(void *data) +{ + typec_mux_put(data); +} + +static void pmic_glink_altmode_put_switch(void *data) +{ + typec_switch_put(data); +} + +static void pmic_glink_altmode_enable_worker(struct work_struct *work) +{ + struct pmic_glink_altmode *altmode = work_to_altmode(work); + int ret; + + ret = pmic_glink_altmode_request(altmode, ALTMODE_PAN_EN, 0); + if (ret) + dev_err(altmode->dev, "failed to request altmode notifications\n"); +} + +static void pmic_glink_altmode_pdr_notify(void *priv, int state) +{ + struct pmic_glink_altmode *altmode = priv; + + if (state == SERVREG_SERVICE_STATE_UP) + schedule_work(&altmode->enable_work); +} + +static const struct of_device_id pmic_glink_altmode_of_quirks[] = { + { .compatible = "qcom,sc8180x-pmic-glink", .data = (void *)PMIC_GLINK_OWNER_USBC }, + {} +}; + +static int pmic_glink_altmode_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct pmic_glink_altmode_port *alt_port; + struct pmic_glink_altmode *altmode; + struct typec_altmode_desc mux_desc = {}; + const struct of_device_id *match; + struct fwnode_handle *fwnode; + struct device *dev = &adev->dev; + u32 port; + int ret; + + altmode = devm_kzalloc(dev, sizeof(*altmode), GFP_KERNEL); + if (!altmode) + return -ENOMEM; + + altmode->dev = dev; + + match = of_match_device(pmic_glink_altmode_of_quirks, dev->parent); + if (match) + altmode->owner_id = (unsigned long)match->data; + else + altmode->owner_id = PMIC_GLINK_OWNER_USBC_PAN; + + INIT_WORK(&altmode->enable_work, pmic_glink_altmode_enable_worker); + init_completion(&altmode->pan_ack); + mutex_init(&altmode->lock); + + device_for_each_child_node(dev, fwnode) { + ret = fwnode_property_read_u32(fwnode, "reg", &port); + if (ret < 0) { + dev_err(dev, "missing reg property of %pOFn\n", fwnode); + return ret; + } + + if (port >= ARRAY_SIZE(altmode->ports)) { + dev_warn(dev, "invalid connector number, ignoring\n"); + continue; + } + + if (altmode->ports[port].altmode) { + dev_err(dev, "multiple connector definition for port %u\n", port); + return -EINVAL; + } + + alt_port = &altmode->ports[port]; + alt_port->altmode = altmode; + alt_port->index = port; + INIT_WORK(&alt_port->work, pmic_glink_altmode_worker); + + alt_port->bridge.funcs = &pmic_glink_altmode_bridge_funcs; + alt_port->bridge.of_node = to_of_node(fwnode); + alt_port->bridge.ops = DRM_BRIDGE_OP_HPD; + alt_port->bridge.type = DRM_MODE_CONNECTOR_USB; + + ret = devm_drm_bridge_add(dev, &alt_port->bridge); + if (ret) + return ret; + + alt_port->dp_alt.svid = USB_TYPEC_DP_SID; + alt_port->dp_alt.mode = USB_TYPEC_DP_MODE; + alt_port->dp_alt.active = 1; + + mux_desc.svid = USB_TYPEC_DP_SID; + mux_desc.mode = USB_TYPEC_DP_MODE; + alt_port->typec_mux = fwnode_typec_mux_get(fwnode, &mux_desc); + if (IS_ERR(alt_port->typec_mux)) + return dev_err_probe(dev, PTR_ERR(alt_port->typec_mux), + "failed to acquire mode-switch for port: %d\n", + port); + + ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_mux, + alt_port->typec_mux); + if (ret) + return ret; + + alt_port->typec_switch = fwnode_typec_switch_get(fwnode); + if (IS_ERR(alt_port->typec_switch)) + return dev_err_probe(dev, PTR_ERR(alt_port->typec_switch), + "failed to acquire orientation-switch for port: %d\n", + port); + + ret = devm_add_action_or_reset(dev, pmic_glink_altmode_put_switch, + alt_port->typec_switch); + if (ret) + return ret; + } + + altmode->client = devm_pmic_glink_register_client(dev, + altmode->owner_id, + pmic_glink_altmode_callback, + pmic_glink_altmode_pdr_notify, + altmode); + return PTR_ERR_OR_ZERO(altmode->client); +} + +static const struct auxiliary_device_id pmic_glink_altmode_id_table[] = { + { .name = "pmic_glink.altmode", }, + {}, +}; +MODULE_DEVICE_TABLE(auxiliary, pmic_glink_altmode_id_table); + +static struct auxiliary_driver pmic_glink_altmode_driver = { + .name = "pmic_glink_altmode", + .probe = pmic_glink_altmode_probe, + .id_table = pmic_glink_altmode_id_table, +}; + +module_auxiliary_driver(pmic_glink_altmode_driver); + +MODULE_DESCRIPTION("Qualcomm PMIC GLINK Altmode driver"); +MODULE_LICENSE("GPL");