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Message-Id: <20210115163311.391332-1-kyletso@google.com>
Date: Sat, 16 Jan 2021 00:33:11 +0800
From: Kyle Tso <kyletso@...gle.com>
To: linux@...ck-us.net, heikki.krogerus@...ux.intel.com,
gregkh@...uxfoundation.org
Cc: badhri@...gle.com, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, Kyle Tso <kyletso@...gle.com>
Subject: [PATCH] usb: typec: tcpm: Create legacy PDOs for PD2 connection
If the port partner is PD2, the PDOs of the local port should follow the
format defined in PD2 Spec. Dynamically modify the pre-defined PD3 PDOs
and transform them into PD2 format before sending them to the PD2 port
partner.
Signed-off-by: Kyle Tso <kyletso@...gle.com>
---
drivers/usb/typec/tcpm/tcpm.c | 62 +++++++++++++++++++++++++++++------
include/linux/usb/pd.h | 1 +
2 files changed, 53 insertions(+), 10 deletions(-)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 22a85b396f69..1220ab1ed47d 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -911,13 +911,47 @@ static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
return 0;
}
+/*
+ * Transform the PDO to be compliant to PD rev2.0.
+ * Return 0 if the PDO type is not defined in PD rev2.0.
+ * Otherwise, return the converted PDO.
+ */
+static u32 tcpm_forge_legacy_pdo(struct tcpm_port *port, u32 pdo, enum typec_role role)
+{
+ switch (pdo_type(pdo)) {
+ case PDO_TYPE_FIXED:
+ if (role == TYPEC_SINK)
+ return pdo & ~PDO_FIXED_FRS_CURR_MASK;
+ else
+ return pdo & ~PDO_FIXED_UNCHUNK_EXT;
+ case PDO_TYPE_VAR:
+ case PDO_TYPE_BATT:
+ return pdo;
+ case PDO_TYPE_APDO:
+ default:
+ return 0;
+ }
+}
+
static int tcpm_pd_send_source_caps(struct tcpm_port *port)
{
struct pd_message msg;
- int i;
+ u32 pdo;
+ unsigned int i, nr_pdo = 0;
memset(&msg, 0, sizeof(msg));
- if (!port->nr_src_pdo) {
+
+ for (i = 0; i < port->nr_src_pdo; i++) {
+ if (port->negotiated_rev >= PD_REV30) {
+ msg.payload[nr_pdo++] = cpu_to_le32(port->src_pdo[i]);
+ } else {
+ pdo = tcpm_forge_legacy_pdo(port, port->src_pdo[i], TYPEC_SOURCE);
+ if (pdo)
+ msg.payload[nr_pdo++] = cpu_to_le32(pdo);
+ }
+ }
+
+ if (!nr_pdo) {
/* No source capabilities defined, sink only */
msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
port->pwr_role,
@@ -930,10 +964,8 @@ static int tcpm_pd_send_source_caps(struct tcpm_port *port)
port->data_role,
port->negotiated_rev,
port->message_id,
- port->nr_src_pdo);
+ nr_pdo);
}
- for (i = 0; i < port->nr_src_pdo; i++)
- msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
}
@@ -941,10 +973,22 @@ static int tcpm_pd_send_source_caps(struct tcpm_port *port)
static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
{
struct pd_message msg;
- int i;
+ u32 pdo;
+ unsigned int i, nr_pdo = 0;
memset(&msg, 0, sizeof(msg));
- if (!port->nr_snk_pdo) {
+
+ for (i = 0; i < port->nr_snk_pdo; i++) {
+ if (port->negotiated_rev >= PD_REV30) {
+ msg.payload[nr_pdo++] = cpu_to_le32(port->snk_pdo[i]);
+ } else {
+ pdo = tcpm_forge_legacy_pdo(port, port->snk_pdo[i], TYPEC_SINK);
+ if (pdo)
+ msg.payload[nr_pdo++] = cpu_to_le32(pdo);
+ }
+ }
+
+ if (!nr_pdo) {
/* No sink capabilities defined, source only */
msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
port->pwr_role,
@@ -957,10 +1001,8 @@ static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
port->data_role,
port->negotiated_rev,
port->message_id,
- port->nr_snk_pdo);
+ nr_pdo);
}
- for (i = 0; i < port->nr_snk_pdo; i++)
- msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
}
diff --git a/include/linux/usb/pd.h b/include/linux/usb/pd.h
index bb9a782e1411..88f64bce5dea 100644
--- a/include/linux/usb/pd.h
+++ b/include/linux/usb/pd.h
@@ -225,6 +225,7 @@ enum pd_pdo_type {
#define PDO_FIXED_EXTPOWER BIT(27) /* Externally powered */
#define PDO_FIXED_USB_COMM BIT(26) /* USB communications capable */
#define PDO_FIXED_DATA_SWAP BIT(25) /* Data role swap supported */
+#define PDO_FIXED_UNCHUNK_EXT BIT(24) /* Unchunked Extended Message supported (Source) */
#define PDO_FIXED_FRS_CURR_MASK (BIT(24) | BIT(23)) /* FR_Swap Current (Sink) */
#define PDO_FIXED_FRS_CURR_SHIFT 23
#define PDO_FIXED_VOLT_SHIFT 10 /* 50mV units */
--
2.30.0.284.gd98b1dd5eaa7-goog
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