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Message-Id: <20201104140030.6853-6-mika.westerberg@linux.intel.com>
Date: Wed, 4 Nov 2020 17:00:25 +0300
From: Mika Westerberg <mika.westerberg@...ux.intel.com>
To: linux-usb@...r.kernel.org
Cc: Michael Jamet <michael.jamet@...el.com>,
Yehezkel Bernat <YehezkelShB@...il.com>,
Andreas Noever <andreas.noever@...il.com>,
Isaac Hazan <isaac.hazan@...el.com>,
Lukas Wunner <lukas@...ner.de>,
"David S . Miller" <davem@...emloft.net>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
netdev@...r.kernel.org
Subject: [PATCH 05/10] thunderbolt: Add functions for enabling and disabling lane bonding on XDomain
From: Isaac Hazan <isaac.hazan@...el.com>
These can be used by service drivers to enable and disable lane bonding
as needed.
Signed-off-by: Isaac Hazan <isaac.hazan@...el.com>
Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
---
drivers/thunderbolt/switch.c | 24 +++++++++++--
drivers/thunderbolt/tb.h | 3 ++
drivers/thunderbolt/xdomain.c | 66 +++++++++++++++++++++++++++++++++++
include/linux/thunderbolt.h | 2 ++
4 files changed, 92 insertions(+), 3 deletions(-)
diff --git a/drivers/thunderbolt/switch.c b/drivers/thunderbolt/switch.c
index 05a360901790..cdfd8cccfe19 100644
--- a/drivers/thunderbolt/switch.c
+++ b/drivers/thunderbolt/switch.c
@@ -503,12 +503,13 @@ static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
/**
* tb_port_state() - get connectedness state of a port
+ * @port: the port to check
*
* The port must have a TB_CAP_PHY (i.e. it should be a real port).
*
* Return: Returns an enum tb_port_state on success or an error code on failure.
*/
-static int tb_port_state(struct tb_port *port)
+int tb_port_state(struct tb_port *port)
{
struct tb_cap_phy phy;
int res;
@@ -1008,7 +1009,16 @@ static int tb_port_set_link_width(struct tb_port *port, unsigned int width)
port->cap_phy + LANE_ADP_CS_1, 1);
}
-static int tb_port_lane_bonding_enable(struct tb_port *port)
+/**
+ * tb_port_lane_bonding_enable() - Enable bonding on port
+ * @port: port to enable
+ *
+ * Enable bonding by setting the link width of the port and the
+ * other port in case of dual link port.
+ *
+ * Return: %0 in case of success and negative errno in case of error
+ */
+int tb_port_lane_bonding_enable(struct tb_port *port)
{
int ret;
@@ -1038,7 +1048,15 @@ static int tb_port_lane_bonding_enable(struct tb_port *port)
return 0;
}
-static void tb_port_lane_bonding_disable(struct tb_port *port)
+/**
+ * tb_port_lane_bonding_disable() - Disable bonding on port
+ * @port: port to disable
+ *
+ * Disable bonding by setting the link width of the port and the
+ * other port in case of dual link port.
+ *
+ */
+void tb_port_lane_bonding_disable(struct tb_port *port)
{
port->dual_link_port->bonded = false;
port->bonded = false;
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h
index 09658d07460e..aa7e2dc66059 100644
--- a/drivers/thunderbolt/tb.h
+++ b/drivers/thunderbolt/tb.h
@@ -865,6 +865,9 @@ struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
int tb_port_get_link_speed(struct tb_port *port);
int tb_port_get_link_width(struct tb_port *port);
+int tb_port_state(struct tb_port *port);
+int tb_port_lane_bonding_enable(struct tb_port *port);
+void tb_port_lane_bonding_disable(struct tb_port *port);
int tb_switch_find_vse_cap(struct tb_switch *sw, enum tb_switch_vse_cap vsec);
int tb_switch_find_cap(struct tb_switch *sw, enum tb_switch_cap cap);
diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c
index 26dc1fc886e5..63889fbd8156 100644
--- a/drivers/thunderbolt/xdomain.c
+++ b/drivers/thunderbolt/xdomain.c
@@ -8,6 +8,7 @@
*/
#include <linux/device.h>
+#include <linux/delay.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
@@ -21,6 +22,7 @@
#define XDOMAIN_UUID_RETRIES 10
#define XDOMAIN_PROPERTIES_RETRIES 60
#define XDOMAIN_PROPERTIES_CHANGED_RETRIES 10
+#define XDOMAIN_BONDING_WAIT 100 /* ms */
struct xdomain_request_work {
struct work_struct work;
@@ -1442,6 +1444,70 @@ void tb_xdomain_remove(struct tb_xdomain *xd)
device_unregister(&xd->dev);
}
+/**
+ * tb_xdomain_lane_bonding_enable() - Enable lane bonding on XDomain
+ * @xd: XDomain connection
+ *
+ * Lane bonding is disabled by default for XDomains. This function tries
+ * to enable bonding by first enabling the port and waiting for the CL0
+ * state.
+ *
+ * Return: %0 in case of success and negative errno in case of error.
+ */
+int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd)
+{
+ struct tb_port *port;
+ int ret;
+
+ port = tb_port_at(xd->route, tb_xdomain_parent(xd));
+ if (!port->dual_link_port)
+ return -ENODEV;
+
+ ret = tb_port_enable(port->dual_link_port);
+ if (ret)
+ return ret;
+
+ ret = tb_wait_for_port(port->dual_link_port, true);
+ if (ret < 0)
+ return ret;
+ if (!ret)
+ return -ENOTCONN;
+
+ ret = tb_port_lane_bonding_enable(port);
+ if (ret) {
+ tb_port_warn(port, "failed to enable lane bonding\n");
+ return ret;
+ }
+
+ tb_xdomain_update_link_attributes(xd);
+
+ dev_dbg(&xd->dev, "lane bonding enabled\n");
+ return 0;
+}
+EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_enable);
+
+/**
+ * tb_xdomain_lane_bonding_disable() - Disable lane bonding
+ * @xd: XDomain connection
+ *
+ * Lane bonding is disabled by default for XDomains. If bonding has been
+ * enabled, this function can be used to disable it.
+ */
+void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd)
+{
+ struct tb_port *port;
+
+ port = tb_port_at(xd->route, tb_xdomain_parent(xd));
+ if (port->dual_link_port) {
+ tb_port_lane_bonding_disable(port);
+ tb_port_disable(port->dual_link_port);
+ tb_xdomain_update_link_attributes(xd);
+
+ dev_dbg(&xd->dev, "lane bonding disabled\n");
+ }
+}
+EXPORT_SYMBOL_GPL(tb_xdomain_lane_bonding_disable);
+
/**
* tb_xdomain_enable_paths() - Enable DMA paths for XDomain connection
* @xd: XDomain connection
diff --git a/include/linux/thunderbolt.h b/include/linux/thunderbolt.h
index e441af88ed77..0a747f92847e 100644
--- a/include/linux/thunderbolt.h
+++ b/include/linux/thunderbolt.h
@@ -247,6 +247,8 @@ struct tb_xdomain {
u8 depth;
};
+int tb_xdomain_lane_bonding_enable(struct tb_xdomain *xd);
+void tb_xdomain_lane_bonding_disable(struct tb_xdomain *xd);
int tb_xdomain_enable_paths(struct tb_xdomain *xd, u16 transmit_path,
u16 transmit_ring, u16 receive_path,
u16 receive_ring);
--
2.28.0
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