linux-kernel - [PATCH AUTOSEL 5.15 05/24] thunderbolt: Read retimer NVM authentication status prior tb_retimer_set_inbound

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Message-Id: <20230724013325.2332084-5-sashal@kernel.org>
Date:   Sun, 23 Jul 2023 21:33:06 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>, andreas.noever@...il.com,
        michael.jamet@...el.com, yehezkel.bernat@...el.com
Subject: [PATCH AUTOSEL 5.15 05/24] thunderbolt: Read retimer NVM authentication status prior tb_retimer_set_inbound_sbtx()

From: Mika Westerberg <mika.westerberg@...ux.intel.com>

[ Upstream commit 1402ba08abae5cfa583ff1a40b99c098a0532d41 ]

According to the USB4 retimer guide the correct order is immediately
after sending ENUMERATE_RETIMERS so update the code to follow this.

Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/thunderbolt/retimer.c | 29 +++++++++++++++++++++--------
 1 file changed, 21 insertions(+), 8 deletions(-)

diff --git a/drivers/thunderbolt/retimer.c b/drivers/thunderbolt/retimer.c
index 566c03105fb8d..1b7ab0bbd1328 100644
--- a/drivers/thunderbolt/retimer.c
+++ b/drivers/thunderbolt/retimer.c
@@ -208,6 +208,21 @@ static ssize_t nvm_authenticate_show(struct device *dev,
 	return ret;
 }
 
+static void tb_retimer_nvm_authenticate_status(struct tb_port *port, u32 *status)
+{
+	int i;
+
+	tb_port_dbg(port, "reading NVM authentication status of retimers\n");
+
+	/*
+	 * Before doing anything else, read the authentication status.
+	 * If the retimer has it set, store it for the new retimer
+	 * device instance.
+	 */
+	for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++)
+		usb4_port_retimer_nvm_authenticate_status(port, i, &status[i]);
+}
+
 static void tb_retimer_set_inbound_sbtx(struct tb_port *port)
 {
 	int i;
@@ -481,18 +496,16 @@ int tb_retimer_scan(struct tb_port *port, bool add)
 		return ret;
 
 	/*
-	 * Enable sideband channel for each retimer. We can do this
-	 * regardless whether there is device connected or not.
+	 * Immediately after sending enumerate retimers read the
+	 * authentication status of each retimer.
 	 */
-	tb_retimer_set_inbound_sbtx(port);
+	tb_retimer_nvm_authenticate_status(port, status);
 
 	/*
-	 * Before doing anything else, read the authentication status.
-	 * If the retimer has it set, store it for the new retimer
-	 * device instance.
+	 * Enable sideband channel for each retimer. We can do this
+	 * regardless whether there is device connected or not.
 	 */
-	for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++)
-		usb4_port_retimer_nvm_authenticate_status(port, i, &status[i]);
+	tb_retimer_set_inbound_sbtx(port);
 
 	for (i = 1; i <= TB_MAX_RETIMER_INDEX; i++) {
 		/*
-- 
2.39.2