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thunderbolt: Add wake on connect/disconnect on USB4 ports 

Wake on connect/disconnect is only supported while runtime suspend for
now, which is obviously necessary. It is also not inherently desired for
the system to wakeup on Thunderbolt/USB4 hot plug events. However, we
can still make user in control of waking up the system in the events of
hot plug/unplug.

This patch adds 'wakeup' attribute under 'usb4_portX/power' sysfs
attribute and only enables wakes on connect/disconnect to the respective
port when 'wakeup' is set to 'enabled'. The attribute is set to
'disabled' by default.

Signed-off-by: Rajat Khandelwal <rajat.khandelwal@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Rajat Khandelwal 2022-11-01 17:20:42 +05:30 committed by Mika Westerberg
parent 2ae18cc226
commit a5cfc9d658
3 changed files with 30 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/thunderbolt/tb_regs.h
View File

@ -361,6 +361,8 @@ struct tb_regs_port_header {
#define PORT_CS_18_BE BIT(8)
#define PORT_CS_18_TCM BIT(9)
#define PORT_CS_18_CPS BIT(10)
#define PORT_CS_18_WOCS BIT(16)
#define PORT_CS_18_WODS BIT(17)
#define PORT_CS_18_WOU4S BIT(18)
#define PORT_CS_19 0x13
#define PORT_CS_19_PC BIT(3)

33
drivers/thunderbolt/usb4.c
View File

@ -155,6 +155,8 @@ static inline int usb4_switch_op_data(struct tb_switch *sw, u16 opcode,
static void usb4_switch_check_wakes(struct tb_switch *sw)
{
bool wakeup_usb4 = false;
struct usb4_port *usb4;
struct tb_port *port;
bool wakeup = false;
u32 val;
@ -173,20 +175,31 @@ static void usb4_switch_check_wakes(struct tb_switch *sw)
wakeup = val & (ROUTER_CS_6_WOPS | ROUTER_CS_6_WOUS);
}
/* Check for any connected downstream ports for USB4 wake */
/*
* Check for any downstream ports for USB4 wake,
* connection wake and disconnection wake.
*/
tb_switch_for_each_port(sw, port) {
if (!tb_port_has_remote(port))
if (!port->cap_usb4)
continue;
if (tb_port_read(port, &val, TB_CFG_PORT,
port->cap_usb4 + PORT_CS_18, 1))
break;
tb_port_dbg(port, "USB4 wake: %s\n",
(val & PORT_CS_18_WOU4S) ? "yes" : "no");
tb_port_dbg(port, "USB4 wake: %s, connection wake: %s, disconnection wake: %s\n",
(val & PORT_CS_18_WOU4S) ? "yes" : "no",
(val & PORT_CS_18_WOCS) ? "yes" : "no",
(val & PORT_CS_18_WODS) ? "yes" : "no");
if (val & PORT_CS_18_WOU4S)
wakeup = true;
wakeup_usb4 = val & (PORT_CS_18_WOU4S | PORT_CS_18_WOCS |
PORT_CS_18_WODS);
usb4 = port->usb4;
if (device_may_wakeup(&usb4->dev) && wakeup_usb4)
pm_wakeup_event(&usb4->dev, 0);
wakeup |= wakeup_usb4;
}
if (wakeup)
@ -366,6 +379,7 @@ bool usb4_switch_lane_bonding_possible(struct tb_switch *sw)
*/
int usb4_switch_set_wake(struct tb_switch *sw, unsigned int flags)
{
struct usb4_port *usb4;
struct tb_port *port;
u64 route = tb_route(sw);
u32 val;
@ -395,10 +409,13 @@ int usb4_switch_set_wake(struct tb_switch *sw, unsigned int flags)
val |= PORT_CS_19_WOU4;
} else {
bool configured = val & PORT_CS_19_PC;
usb4 = port->usb4;
if ((flags & TB_WAKE_ON_CONNECT) && !configured)
if (((flags & TB_WAKE_ON_CONNECT) |
device_may_wakeup(&usb4->dev)) && !configured)
val |= PORT_CS_19_WOC;
if ((flags & TB_WAKE_ON_DISCONNECT) && configured)
if (((flags & TB_WAKE_ON_DISCONNECT) |
device_may_wakeup(&usb4->dev)) && configured)
val |= PORT_CS_19_WOD;
if ((flags & TB_WAKE_ON_USB4) && configured)
val |= PORT_CS_19_WOU4;

3
drivers/thunderbolt/usb4_port.c
View File

@ -284,6 +284,9 @@ struct usb4_port *usb4_port_device_add(struct tb_port *port)
}
}
if (!tb_is_upstream_port(port))
device_set_wakeup_capable(&usb4->dev, true);
pm_runtime_no_callbacks(&usb4->dev);
pm_runtime_set_active(&usb4->dev);
pm_runtime_enable(&usb4->dev);