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Message-Id: <20240218222039.822040-4-lk@c--e.de>
Date: Sun, 18 Feb 2024 23:20:36 +0100
From: "Christian A. Ehrhardt" <lk@...e.de>
To: linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: "Christian A. Ehrhardt" <lk@...e.de>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Samuel Čavoj <samuel@...oj.net>,
Hans de Goede <hdegoede@...hat.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Prashanth K <quic_prashk@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Saranya Gopal <saranya.gopal@...el.com>,
Haotien Hsu <haotienh@...dia.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Utkarsh Patel <utkarsh.h.patel@...el.com>,
Bjorn Andersson <andersson@...nel.org>,
Luca Weiss <luca.weiss@...rphone.com>,
Min-Hua Chen <minhuadotchen@...il.com>,
Rob Herring <robh@...nel.org>,
Rajaram Regupathy <rajaram.regupathy@...el.com>,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org,
Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Subject: [RFC PATCH 3/6] usb: typec: ucsi: Make Version a parameter to ucsi_register
Reading UCSI_VERSION is a special case as there is no
notification that syncs the data into host memory.
Read UCSI_VERSION only once during initialization and provide
it as a parameter to ucsi_register().
Signed-off-by: Christian A. Ehrhardt <lk@...e.de>
---
drivers/usb/typec/ucsi/ucsi.c | 13 ++++---------
drivers/usb/typec/ucsi/ucsi.h | 2 +-
drivers/usb/typec/ucsi/ucsi_acpi.c | 8 +++++++-
drivers/usb/typec/ucsi/ucsi_ccg.c | 12 ++++++++++--
drivers/usb/typec/ucsi/ucsi_glink.c | 11 ++++++++++-
drivers/usb/typec/ucsi/ucsi_stm32g0.c | 26 ++++++++++++++++++++++----
6 files changed, 54 insertions(+), 18 deletions(-)
diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index ae105383e69e..eb630447ba80 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1581,18 +1581,13 @@ EXPORT_SYMBOL_GPL(ucsi_destroy);
/**
* ucsi_register - Register UCSI interface
* @ucsi: UCSI instance
+ * @version: The revision of the UCSI spec
*/
-int ucsi_register(struct ucsi *ucsi)
+int ucsi_register(struct ucsi *ucsi, u16 version)
{
- int ret;
-
- ret = ucsi->ops->read(ucsi, UCSI_VERSION, &ucsi->version,
- sizeof(ucsi->version));
- if (ret)
- return ret;
-
- if (!ucsi->version)
+ if (!version)
return -ENODEV;
+ ucsi->version = version;
/*
* Version format is JJ.M.N (JJ = Major version, M = Minor version,
diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
index 7e35ffbe0a6f..100e16b49814 100644
--- a/drivers/usb/typec/ucsi/ucsi.h
+++ b/drivers/usb/typec/ucsi/ucsi.h
@@ -77,7 +77,7 @@ struct ucsi_operations {
struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops);
void ucsi_destroy(struct ucsi *ucsi);
-int ucsi_register(struct ucsi *ucsi);
+int ucsi_register(struct ucsi *ucsi, u16 version);
void ucsi_unregister(struct ucsi *ucsi);
void *ucsi_get_drvdata(struct ucsi *ucsi);
void ucsi_set_drvdata(struct ucsi *ucsi, void *data);
diff --git a/drivers/usb/typec/ucsi/ucsi_acpi.c b/drivers/usb/typec/ucsi/ucsi_acpi.c
index 928eacbeb21a..710ddfc03ed0 100644
--- a/drivers/usb/typec/ucsi/ucsi_acpi.c
+++ b/drivers/usb/typec/ucsi/ucsi_acpi.c
@@ -226,6 +226,7 @@ static int ucsi_acpi_probe(struct platform_device *pdev)
const struct dmi_system_id *id;
struct ucsi_acpi *ua;
struct resource *res;
+ u16 version;
acpi_status status;
int ret;
@@ -272,7 +273,12 @@ static int ucsi_acpi_probe(struct platform_device *pdev)
return -ENODEV;
}
- ret = ucsi_register(ua->ucsi);
+ ret = ucsi_acpi_dsm(ua, UCSI_DSM_FUNC_READ);
+ if (ret)
+ return ret;
+ version = le16_to_cpu(*(__le16 *)(ua->base + UCSI_VERSION));
+
+ ret = ucsi_register(ua->ucsi, version);
if (ret) {
acpi_remove_notify_handler(ACPI_HANDLE(&pdev->dev),
ACPI_DEVICE_NOTIFY,
diff --git a/drivers/usb/typec/ucsi/ucsi_ccg.c b/drivers/usb/typec/ucsi/ucsi_ccg.c
index 709295948c65..d47f5e31c98a 100644
--- a/drivers/usb/typec/ucsi/ucsi_ccg.c
+++ b/drivers/usb/typec/ucsi/ucsi_ccg.c
@@ -1356,7 +1356,7 @@ static int ccg_restart(struct ucsi_ccg *uc)
return status;
}
- status = ucsi_register(uc->ucsi);
+ status = ucsi_register(uc->ucsi, uc->ucsi->version);
if (status) {
dev_err(uc->dev, "failed to register the interface\n");
return status;
@@ -1422,6 +1422,7 @@ static int ucsi_ccg_probe(struct i2c_client *client)
struct ucsi_ccg *uc;
const char *fw_name;
int status;
+ __le16 version;
uc = devm_kzalloc(dev, sizeof(*uc), GFP_KERNEL);
if (!uc)
@@ -1477,7 +1478,14 @@ static int ucsi_ccg_probe(struct i2c_client *client)
goto out_ucsi_destroy;
}
- status = ucsi_register(uc->ucsi);
+ status = ccg_read(uc, CCGX_RAB_UCSI_DATA_BLOCK(UCSI_VERSION),
+ (u8 *)&version, sizeof(version));
+ if (status < 0) {
+ dev_err(uc->dev, "cannot read UCSI version - %d\n", status);
+ return status;
+ }
+
+ status = ucsi_register(uc->ucsi, le16_to_cpu(version));
if (status)
goto out_free_irq;
diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c
index 0a0d08467c56..7a0b28536abd 100644
--- a/drivers/usb/typec/ucsi/ucsi_glink.c
+++ b/drivers/usb/typec/ucsi/ucsi_glink.c
@@ -255,8 +255,17 @@ static void pmic_glink_ucsi_notify(struct work_struct *work)
static void pmic_glink_ucsi_register(struct work_struct *work)
{
struct pmic_glink_ucsi *ucsi = container_of(work, struct pmic_glink_ucsi, register_work);
+ __le16 version;
+ int ret;
+
+ ret = pmic_glink_ucsi_read(ucsi->ucsi, UCSI_VERSION, &version,
+ sizeof(version));
+ if (ret < 0) {
+ dev_err(ucsi->dev, "cannot read version: %d\n", ret);
+ return;
+ }
- ucsi_register(ucsi->ucsi);
+ ucsi_register(ucsi->ucsi, le16_to_cpu(version));
}
static void pmic_glink_ucsi_callback(const void *data, size_t len, void *priv)
diff --git a/drivers/usb/typec/ucsi/ucsi_stm32g0.c b/drivers/usb/typec/ucsi/ucsi_stm32g0.c
index 93d7806681cf..112692c7a158 100644
--- a/drivers/usb/typec/ucsi/ucsi_stm32g0.c
+++ b/drivers/usb/typec/ucsi/ucsi_stm32g0.c
@@ -325,10 +325,10 @@ static int ucsi_stm32g0_fw_rcv(struct ucsi *ucsi, void *data, size_t len)
return ucsi_stm32g0_bl_rcv_woack(ucsi, data, len);
}
-/* UCSI ops */
-static int ucsi_stm32g0_read(struct ucsi *ucsi, unsigned int offset, void *val, size_t len)
+static int ucsi_stm32g0_read_from_hw(struct ucsi_stm32g0 *g0,
+ unsigned int offset,
+ void *val, size_t len)
{
- struct ucsi_stm32g0 *g0 = ucsi_get_drvdata(ucsi);
struct i2c_client *client = g0->client;
u8 reg = offset;
struct i2c_msg msg[] = {
@@ -357,6 +357,15 @@ static int ucsi_stm32g0_read(struct ucsi *ucsi, unsigned int offset, void *val,
return 0;
}
+/* UCSI ops */
+static int ucsi_stm32g0_read(struct ucsi *ucsi, unsigned int offset,
+ void *val, size_t len)
+{
+ struct ucsi_stm32g0 *g0 = ucsi_get_drvdata(ucsi);
+
+ return ucsi_stm32g0_read_from_hw(g0, offset, val, len);
+}
+
static int ucsi_stm32g0_async_write(struct ucsi *ucsi, unsigned int offset, const void *val,
size_t len)
{
@@ -445,6 +454,7 @@ static int ucsi_stm32g0_register(struct ucsi *ucsi)
{
struct ucsi_stm32g0 *g0 = ucsi_get_drvdata(ucsi);
struct i2c_client *client = g0->client;
+ __le16 version;
int ret;
/* Request alert interrupt */
@@ -455,7 +465,15 @@ static int ucsi_stm32g0_register(struct ucsi *ucsi)
return ret;
}
- ret = ucsi_register(ucsi);
+ ret = ucsi_stm32g0_read_from_hw(g0, UCSI_VERSION, &version,
+ sizeof(version));
+ if (ret) {
+ dev_err(g0->dev, "failed to read version number: %d\n", ret);
+ free_irq(client->irq, g0);
+ return ret;
+ }
+
+ ret = ucsi_register(ucsi, le16_to_cpu(version));
if (ret) {
dev_err_probe(g0->dev, ret, "ucsi_register failed\n");
free_irq(client->irq, g0);
--
2.40.1
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