diff options
| author | Mario Limonciello <mario.limonciello@amd.com> | 2022-09-26 09:33:50 -0500 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2022-09-26 20:18:25 +0300 |
| commit | 5d2569cb4a65c373896ec0217febdf88739ed295 (patch) | |
| tree | e9ee7919c9fca8557180776998597d957f796ae0 /drivers/thunderbolt/usb4.c | |
| parent | 8d9dcfff7b1c6b5c4264d91b193336c6f6df9b53 (diff) | |
thunderbolt: Explicitly enable lane adapter hotplug events at startup
Software that has run before the USB4 CM in Linux runs may have disabled
hotplug events for a given lane adapter.
Other CMs such as that one distributed with Windows 11 will enable hotplug
events. Do the same thing in the Linux CM which fixes hotplug events on
"AMD Pink Sardine".
Cc: stable@vger.kernel.org
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/usb4.c')
| -rw-r--r-- | drivers/thunderbolt/usb4.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/thunderbolt/usb4.c b/drivers/thunderbolt/usb4.c index 70036f3e37a5..38c10c30e6cf 100644 --- a/drivers/thunderbolt/usb4.c +++ b/drivers/thunderbolt/usb4.c @@ -1046,6 +1046,26 @@ int usb4_port_unlock(struct tb_port *port) return tb_port_write(port, &val, TB_CFG_PORT, ADP_CS_4, 1); } +/** + * usb4_port_hotplug_enable() - Enables hotplug for a port + * @port: USB4 port to operate on + * + * Enables hot plug events on a given port. This is only intended + * to be used on lane, DP-IN, and DP-OUT adapters. + */ +int usb4_port_hotplug_enable(struct tb_port *port) +{ + int ret; + u32 val; + + ret = tb_port_read(port, &val, TB_CFG_PORT, ADP_CS_5, 1); + if (ret) + return ret; + + val &= ~ADP_CS_5_DHP; + return tb_port_write(port, &val, TB_CFG_PORT, ADP_CS_5, 1); +} + static int usb4_port_set_configured(struct tb_port *port, bool configured) { int ret; |