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Message-Id: <20250624222922.2010820-1-anjelique.melendez@oss.qualcomm.com>
Date: Tue, 24 Jun 2025 15:29:22 -0700
From: Anjelique Melendez <anjelique.melendez@....qualcomm.com>
To: heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org
Cc: lumag@...nel.org, neil.armstrong@...aro.org, johan+linaro@...nel.org,
quic_bjorande@...cinc.com, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: [PATCH] usb: typec: ucsi: ucsi_glink: Increase buffer size to support UCSI v2
UCSI v2 specification has increased the MSG_IN and MSG_OUT size from
16 bytes to 256 bytes each for the message exchange between OPM and PPM
This makes the total buffer size increase from 48 bytes to 528 bytes.
Update the buffer size to support this increase.
Signed-off-by: Anjelique Melendez <anjelique.melendez@....qualcomm.com>
---
drivers/usb/typec/ucsi/ucsi_glink.c | 50 ++++++++++++++++++++++++++---
1 file changed, 45 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c
index 8af79101a2fc..d20f01a0cd5c 100644
--- a/drivers/usb/typec/ucsi/ucsi_glink.c
+++ b/drivers/usb/typec/ucsi/ucsi_glink.c
@@ -2,6 +2,7 @@
/*
* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2023, Linaro Ltd
+ * ​Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
*/
#include <linux/auxiliary_bus.h>
#include <linux/module.h>
@@ -16,10 +17,11 @@
#define PMIC_GLINK_MAX_PORTS 3
-#define UCSI_BUF_SIZE 48
+#define UCSI_BUF_V1_SIZE 48
+#define UCSI_BUF_V2_SIZE 528
#define MSG_TYPE_REQ_RESP 1
-#define UCSI_BUF_SIZE 48
+#define UCSI_BUF_SIZE UCSI_BUF_V2_SIZE
#define UC_NOTIFY_RECEIVER_UCSI 0x0
#define UC_UCSI_READ_BUF_REQ 0x11
@@ -36,12 +38,24 @@ struct ucsi_read_buf_resp_msg {
u32 ret_code;
};
+struct ucsi_v1_read_buf_resp_msg {
+ struct pmic_glink_hdr hdr;
+ u8 buf[UCSI_BUF_V1_SIZE];
+ u32 ret_code;
+};
+
struct ucsi_write_buf_req_msg {
struct pmic_glink_hdr hdr;
u8 buf[UCSI_BUF_SIZE];
u32 reserved;
};
+struct ucsi_v1_write_buf_req_msg {
+ struct pmic_glink_hdr hdr;
+ u8 buf[UCSI_BUF_V1_SIZE];
+ u32 reserved;
+};
+
struct ucsi_write_buf_resp_msg {
struct pmic_glink_hdr hdr;
u32 ret_code;
@@ -133,6 +147,7 @@ static int pmic_glink_ucsi_locked_write(struct pmic_glink_ucsi *ucsi, unsigned i
{
struct ucsi_write_buf_req_msg req = {};
unsigned long left;
+ size_t len;
int ret;
req.hdr.owner = PMIC_GLINK_OWNER_USBC;
@@ -142,7 +157,18 @@ static int pmic_glink_ucsi_locked_write(struct pmic_glink_ucsi *ucsi, unsigned i
reinit_completion(&ucsi->write_ack);
- ret = pmic_glink_send(ucsi->client, &req, sizeof(req));
+ if (!ucsi->ucsi->version || ucsi->ucsi->version >= UCSI_VERSION_2_1) {
+ /* If UCSI version is unknown, use the maximum buffer size */
+ len = sizeof(req);
+ } else {
+ /*
+ * If UCSI V1, buffer size should be UCSI_BUF_V1_SIZE so update
+ * len accordingly
+ */
+ len = sizeof(struct ucsi_v1_write_buf_req_msg);
+ }
+
+ ret = pmic_glink_send(ucsi->client, &req, len);
if (ret < 0) {
dev_err(ucsi->dev, "failed to send UCSI write request: %d\n", ret);
return ret;
@@ -217,11 +243,25 @@ static const struct ucsi_operations pmic_glink_ucsi_ops = {
static void pmic_glink_ucsi_read_ack(struct pmic_glink_ucsi *ucsi, const void *data, int len)
{
const struct ucsi_read_buf_resp_msg *resp = data;
+ u32 ret_code, buffer_len;
+
+ if (!ucsi->ucsi->version || ucsi->ucsi->version >= UCSI_VERSION_2_1) {
+ /* If UCSI version is unknown, use the maximum buffer size */
+ ret_code = resp->ret_code;
+ buffer_len = UCSI_BUF_V2_SIZE;
+ } else {
+ /*
+ * If UCSI V1, use UCSI_BUF_V1_SIZE buffer size and
+ * update ret_code offset accordingly
+ */
+ ret_code = ((struct ucsi_v1_read_buf_resp_msg *)data)->ret_code;
+ buffer_len = UCSI_BUF_V1_SIZE;
+ }
- if (resp->ret_code)
+ if (ret_code)
return;
- memcpy(ucsi->read_buf, resp->buf, UCSI_BUF_SIZE);
+ memcpy(ucsi->read_buf, resp->buf, buffer_len);
complete(&ucsi->read_ack);
}
--
2.34.1
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