Patch "thunderbolt: Introduce tb_port_reset()" has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    thunderbolt: Introduce tb_port_reset()

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     thunderbolt-introduce-tb_port_reset.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 01da6b99d49f60b1edead44e33569b1a2e9f49b7 Mon Sep 17 00:00:00 2001
From: Sanath S <Sanath.S@xxxxxxx>
Date: Sat, 13 Jan 2024 11:39:57 +0200
Subject: thunderbolt: Introduce tb_port_reset()

From: Sanath S <Sanath.S@xxxxxxx>

commit 01da6b99d49f60b1edead44e33569b1a2e9f49b7 upstream.

Introduce a function that issues Downstream Port Reset to a USB4 port.
This supports Thunderbolt 2, 3 and USB4 routers.

Signed-off-by: Sanath S <Sanath.S@xxxxxxx>
Signed-off-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/thunderbolt/lc.c      |   45 ++++++++++++++++++++++++++++++++++++++++++
 drivers/thunderbolt/switch.c  |    7 ++++++
 drivers/thunderbolt/tb.h      |    2 +
 drivers/thunderbolt/tb_regs.h |    4 +++
 drivers/thunderbolt/usb4.c    |   39 ++++++++++++++++++++++++++++++++++++
 5 files changed, 97 insertions(+)

--- a/drivers/thunderbolt/lc.c
+++ b/drivers/thunderbolt/lc.c
@@ -6,6 +6,8 @@
  * Author: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
  */
 
+#include <linux/delay.h>
+
 #include "tb.h"
 
 /**
@@ -45,6 +47,49 @@ static int find_port_lc_cap(struct tb_po
 	return sw->cap_lc + start + phys * size;
 }
 
+/**
+ * tb_lc_reset_port() - Trigger downstream port reset through LC
+ * @port: Port that is reset
+ *
+ * Triggers downstream port reset through link controller registers.
+ * Returns %0 in case of success negative errno otherwise. Only supports
+ * non-USB4 routers with link controller (that's Thunderbolt 2 and
+ * Thunderbolt 3).
+ */
+int tb_lc_reset_port(struct tb_port *port)
+{
+	struct tb_switch *sw = port->sw;
+	int cap, ret;
+	u32 mode;
+
+	if (sw->generation < 2)
+		return -EINVAL;
+
+	cap = find_port_lc_cap(port);
+	if (cap < 0)
+		return cap;
+
+	ret = tb_sw_read(sw, &mode, TB_CFG_SWITCH, cap + TB_LC_PORT_MODE, 1);
+	if (ret)
+		return ret;
+
+	mode |= TB_LC_PORT_MODE_DPR;
+
+	ret = tb_sw_write(sw, &mode, TB_CFG_SWITCH, cap + TB_LC_PORT_MODE, 1);
+	if (ret)
+		return ret;
+
+	fsleep(10000);
+
+	ret = tb_sw_read(sw, &mode, TB_CFG_SWITCH, cap + TB_LC_PORT_MODE, 1);
+	if (ret)
+		return ret;
+
+	mode &= ~TB_LC_PORT_MODE_DPR;
+
+	return tb_sw_write(sw, &mode, TB_CFG_SWITCH, cap + TB_LC_PORT_MODE, 1);
+}
+
 static int tb_lc_set_port_configured(struct tb_port *port, bool configured)
 {
 	bool upstream = tb_is_upstream_port(port);
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -676,6 +676,13 @@ int tb_port_disable(struct tb_port *port
 	return __tb_port_enable(port, false);
 }
 
+static int tb_port_reset(struct tb_port *port)
+{
+	if (tb_switch_is_usb4(port->sw))
+		return port->cap_usb4 ? usb4_port_reset(port) : 0;
+	return tb_lc_reset_port(port);
+}
+
 /*
  * tb_init_port() - initialize a port
  *
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -1173,6 +1173,7 @@ int tb_drom_read(struct tb_switch *sw);
 int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
 
 int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid);
+int tb_lc_reset_port(struct tb_port *port);
 int tb_lc_configure_port(struct tb_port *port);
 void tb_lc_unconfigure_port(struct tb_port *port);
 int tb_lc_configure_xdomain(struct tb_port *port);
@@ -1305,6 +1306,7 @@ void usb4_switch_remove_ports(struct tb_
 
 int usb4_port_unlock(struct tb_port *port);
 int usb4_port_hotplug_enable(struct tb_port *port);
+int usb4_port_reset(struct tb_port *port);
 int usb4_port_configure(struct tb_port *port);
 void usb4_port_unconfigure(struct tb_port *port);
 int usb4_port_configure_xdomain(struct tb_port *port, struct tb_xdomain *xd);
--- a/drivers/thunderbolt/tb_regs.h
+++ b/drivers/thunderbolt/tb_regs.h
@@ -389,6 +389,7 @@ struct tb_regs_port_header {
 #define PORT_CS_18_CSA				BIT(22)
 #define PORT_CS_18_TIP				BIT(24)
 #define PORT_CS_19				0x13
+#define PORT_CS_19_DPR				BIT(0)
 #define PORT_CS_19_PC				BIT(3)
 #define PORT_CS_19_PID				BIT(4)
 #define PORT_CS_19_WOC				BIT(16)
@@ -584,6 +585,9 @@ struct tb_regs_hop {
 #define TB_LC_POWER				0x740
 
 /* Link controller registers */
+#define TB_LC_PORT_MODE				0x26
+#define TB_LC_PORT_MODE_DPR			BIT(0)
+
 #define TB_LC_CS_42				0x2a
 #define TB_LC_CS_42_USB_PLUGGED			BIT(31)
 
--- a/drivers/thunderbolt/usb4.c
+++ b/drivers/thunderbolt/usb4.c
@@ -1113,6 +1113,45 @@ int usb4_port_hotplug_enable(struct tb_p
 	return tb_port_write(port, &val, TB_CFG_PORT, ADP_CS_5, 1);
 }
 
+/**
+ * usb4_port_reset() - Issue downstream port reset
+ * @port: USB4 port to reset
+ *
+ * Issues downstream port reset to @port.
+ */
+int usb4_port_reset(struct tb_port *port)
+{
+	int ret;
+	u32 val;
+
+	if (!port->cap_usb4)
+		return -EINVAL;
+
+	ret = tb_port_read(port, &val, TB_CFG_PORT,
+			   port->cap_usb4 + PORT_CS_19, 1);
+	if (ret)
+		return ret;
+
+	val |= PORT_CS_19_DPR;
+
+	ret = tb_port_write(port, &val, TB_CFG_PORT,
+			    port->cap_usb4 + PORT_CS_19, 1);
+	if (ret)
+		return ret;
+
+	fsleep(10000);
+
+	ret = tb_port_read(port, &val, TB_CFG_PORT,
+			   port->cap_usb4 + PORT_CS_19, 1);
+	if (ret)
+		return ret;
+
+	val &= ~PORT_CS_19_DPR;
+
+	return tb_port_write(port, &val, TB_CFG_PORT,
+			     port->cap_usb4 + PORT_CS_19, 1);
+}
+
 static int usb4_port_set_configured(struct tb_port *port, bool configured)
 {
 	int ret;


Patches currently in stable-queue which might be from Sanath.S@xxxxxxx are

queue-6.8/thunderbolt-reset-topology-created-by-the-boot-firmware.patch
queue-6.8/thunderbolt-introduce-tb_port_reset.patch
queue-6.8/thunderbolt-introduce-tb_path_deactivate_hop.patch
queue-6.8/thunderbolt-make-tb_switch_reset-support-thunderbolt-2-3-and-usb4-routers.patch




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