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thunderbolt: Do not tunnel USB3 if link is not USB4

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USB3 tunneling is possible only over USB4 link so don't create USB3
tunnels if that's not the case.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2020-03-04 17:09:14 +02:00
parent e876f34adc
commit bbcf40b392
4 changed files with 27 additions and 3 deletions
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3
drivers/thunderbolt/tb.c
View File

@ -235,6 +235,9 @@ static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw)
if (!up)
return 0;
if (!sw->link_usb4)
return 0;
/*
* Look up available down port. Since we are chaining it should
* be found right above this switch.

2
drivers/thunderbolt/tb.h
View File

@ -97,6 +97,7 @@ struct tb_switch_tmu {
* @device_name: Name of the device (or %NULL if not known)
* @link_speed: Speed of the link in Gb/s
* @link_width: Width of the link (1 or 2)
* @link_usb4: Upstream link is USB4
* @generation: Switch Thunderbolt generation
* @cap_plug_events: Offset to the plug events capability (%0 if not found)
* @cap_lc: Offset to the link controller capability (%0 if not found)
@ -136,6 +137,7 @@ struct tb_switch {
const char *device_name;
unsigned int link_speed;
unsigned int link_width;
bool link_usb4;
unsigned int generation;
int cap_plug_events;
int cap_lc;

1
drivers/thunderbolt/tb_regs.h
View File

@ -290,6 +290,7 @@ struct tb_regs_port_header {
/* USB4 port registers */
#define PORT_CS_18 0x12
#define PORT_CS_18_BE BIT(8)
#define PORT_CS_18_TCM BIT(9)
#define PORT_CS_19 0x13
#define PORT_CS_19_PC BIT(3)

24
drivers/thunderbolt/usb4.c
View File

@ -192,6 +192,20 @@ static int usb4_switch_op(struct tb_switch *sw, u16 opcode, u8 *status)
return 0;
}
static bool link_is_usb4(struct tb_port *port)
{
u32 val;
if (!port->cap_usb4)
return false;
if (tb_port_read(port, &val, TB_CFG_PORT,
port->cap_usb4 + PORT_CS_18, 1))
return false;
return !(val & PORT_CS_18_TCM);
}
/**
* usb4_switch_setup() - Additional setup for USB4 device
* @sw: USB4 router to setup
@ -205,6 +219,7 @@ static int usb4_switch_op(struct tb_switch *sw, u16 opcode, u8 *status)
*/
int usb4_switch_setup(struct tb_switch *sw)
{
struct tb_port *downstream_port;
struct tb_switch *parent;
bool tbt3, xhci;
u32 val = 0;
@ -217,6 +232,11 @@ int usb4_switch_setup(struct tb_switch *sw)
if (ret)
return ret;
parent = tb_switch_parent(sw);
downstream_port = tb_port_at(tb_route(sw), parent);
sw->link_usb4 = link_is_usb4(downstream_port);
tb_sw_dbg(sw, "link: %s\n", sw->link_usb4 ? "USB4" : "TBT3");
xhci = val & ROUTER_CS_6_HCI;
tbt3 = !(val & ROUTER_CS_6_TNS);
@ -227,9 +247,7 @@ int usb4_switch_setup(struct tb_switch *sw)
if (ret)
return ret;
parent = tb_switch_parent(sw);
if (tb_switch_find_port(parent, TB_TYPE_USB3_DOWN)) {
if (sw->link_usb4 && tb_switch_find_port(parent, TB_TYPE_USB3_DOWN)) {
val |= ROUTER_CS_5_UTO;
xhci = false;
}