diff options
| author | Isaac Hazan <isaac.hazan@intel.com> | 2020-09-24 11:44:01 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2020-11-11 10:20:16 +0300 |
| commit | 5cc0df9ce10a860aaeac53f8df1cc8754c5c7b03 (patch) | |
| tree | e159cb2c2c4f8df5a644b40ebad49ef773b8a4d5 /drivers/thunderbolt/xdomain.c | |
| parent | 4210d50f0b3e423e10a7a254b2a67f5c5318868e (diff) | |
thunderbolt: Add functions for enabling and disabling lane bonding on XDomain
These can be used by service drivers to enable and disable lane bonding
as needed.
Signed-off-by: Isaac Hazan <isaac.hazan@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/thunderbolt/xdomain.c')
| -rw-r--r-- | drivers/thunderbolt/xdomain.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/thunderbolt/xdomain.c b/drivers/thunderbolt/xdomain.c index 83a315f96934..65108216bfe3 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; @@ -1444,6 +1446,70 @@ void tb_xdomain_remove(struct tb_xdomain *xd) } /** + * 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 * @transmit_path: HopID of the transmit path the other end is using to |