[PATCH v2 07/11] usb: typec: ucsi: support delaying GET_PDOS for device

From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
To: Heikki Krogerus <heikki.krogerus@linux.intel.com>,
	 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	 Guenter Roeck <linux@roeck-us.net>,
	Bjorn Andersson <andersson@kernel.org>,
	 Neil Armstrong <neil.armstrong@linaro.org>,
	 Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Johan Hovold <johan+linaro@kernel.org>,
	linux-usb@vger.kernel.org,  linux-arm-msm@vger.kernel.org,
	 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Subject: [PATCH v2 07/11] usb: typec: ucsi: support delaying GET_PDOS for device
Date: Fri, 29 Mar 2024 08:15:39 +0200	[thread overview]
Message-ID: <20240329-qcom-ucsi-fixes-v2-7-0f5d37ed04db@linaro.org> (raw)
In-Reply-To: <20240329-qcom-ucsi-fixes-v2-0-0f5d37ed04db@linaro.org>

Qualcomm firmware doesn't return sane information for device's PDOs
unless the partner is also using a PD mode. On SC8280XP this even
results in the Error bit being set in the UCSI response (with 0 error
status).

Add a quirk to delay reading USB PD capabilities for a device until we
detect a partner in PD mode.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/usb/typec/ucsi/ucsi.c | 41 ++++++++++++++++++++++++++++-------------
 drivers/usb/typec/ucsi/ucsi.h |  1 +
 2 files changed, 29 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 18b2e4ffc57e..f5ec776b84d6 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -821,6 +821,28 @@ static int ucsi_check_altmodes(struct ucsi_connector *con)
 	return ret;
 }
 
+static void ucsi_register_device_pdos(struct ucsi_connector *con)
+{
+	struct ucsi *ucsi = con->ucsi;
+	struct usb_power_delivery_desc desc = { ucsi->cap.pd_version };
+	struct usb_power_delivery_capabilities *pd_cap;
+
+	if (con->pd)
+		return;
+
+	con->pd = usb_power_delivery_register(ucsi->dev, &desc);
+
+	pd_cap = ucsi_get_pd_caps(con, TYPEC_SOURCE, false);
+	if (!IS_ERR(pd_cap))
+		con->port_source_caps = pd_cap;
+
+	pd_cap = ucsi_get_pd_caps(con, TYPEC_SINK, false);
+	if (!IS_ERR(pd_cap))
+		con->port_sink_caps = pd_cap;
+
+	typec_port_set_usb_power_delivery(con->port, con->pd);
+}
+
 static int ucsi_register_partner_pdos(struct ucsi_connector *con)
 {
 	struct usb_power_delivery_desc desc = { con->ucsi->cap.pd_version };
@@ -981,6 +1003,9 @@ static int ucsi_register_partner(struct ucsi_connector *con)
 		break;
 	}
 
+	if (pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD)
+		ucsi_register_device_pdos(con);
+
 	desc.identity = &con->partner_identity;
 	desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
 	desc.pd_revision = UCSI_CONCAP_FLAG_PARTNER_PD_MAJOR_REV_AS_BCD(con->cap.flags);
@@ -1465,8 +1490,6 @@ static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
 
 static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 {
-	struct usb_power_delivery_desc desc = { ucsi->cap.pd_version};
-	struct usb_power_delivery_capabilities *pd_cap;
 	struct typec_capability *cap = &con->typec_cap;
 	enum typec_accessory *accessory = cap->accessory;
 	enum usb_role u_role = USB_ROLE_NONE;
@@ -1544,17 +1567,8 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 		goto out;
 	}
 
-	con->pd = usb_power_delivery_register(ucsi->dev, &desc);
-
-	pd_cap = ucsi_get_pd_caps(con, TYPEC_SOURCE, false);
-	if (!IS_ERR(pd_cap))
-		con->port_source_caps = pd_cap;
-
-	pd_cap = ucsi_get_pd_caps(con, TYPEC_SINK, false);
-	if (!IS_ERR(pd_cap))
-		con->port_sink_caps = pd_cap;
-
-	typec_port_set_usb_power_delivery(con->port, con->pd);
+	if (!(ucsi->quirks & UCSI_DELAY_DEVICE_PDOS))
+		ucsi_register_device_pdos(con);
 
 	/* Alternate modes */
 	ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON);
@@ -1617,6 +1631,7 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
 	if (con->partner &&
 	    UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
 	    UCSI_CONSTAT_PWR_OPMODE_PD) {
+		ucsi_register_device_pdos(con);
 		ucsi_get_src_pdos(con);
 		ucsi_check_altmodes(con);
 	}
diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
index 591f734d457b..2caf2969668c 100644
--- a/drivers/usb/typec/ucsi/ucsi.h
+++ b/drivers/usb/typec/ucsi/ucsi.h
@@ -406,6 +406,7 @@ struct ucsi {
 
 	unsigned long quirks;
 #define UCSI_NO_PARTNER_PDOS	BIT(0)	/* Don't read partner's PDOs */
+#define UCSI_DELAY_DEVICE_PDOS	BIT(1)	/* Reading PDOs fails until the parter is in PD mode */
 };
 
 #define UCSI_MAX_SVID		5

-- 
2.39.2

