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thunderbolt: Identify USB4 v2 routers 

Add a new function usb4_switch_version() that can be used to figure out
the spec version of the router and make tb_switch_is_usb4() to use it as
well. Update the uevent accordingly.

Signed-off-by: Gil Fine <gil.fine@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Gil Fine 2022-09-23 01:30:43 +03:00 committed by Mika Westerberg
parent 2ad3e1314c
commit 6e21007d0f
3 changed files with 28 additions and 15 deletions
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5
drivers/thunderbolt/switch.c
View File

@ -2056,8 +2056,9 @@ static int tb_switch_uevent(const struct device *dev, struct kobj_uevent_env *en
const struct tb_switch *sw = tb_to_switch(dev);
const char *type;
if (sw->config.thunderbolt_version == USB4_VERSION_1_0) {
if (add_uevent_var(env, "USB4_VERSION=1.0"))
if (tb_switch_is_usb4(sw)) {
if (add_uevent_var(env, "USB4_VERSION=%u.0",
usb4_switch_version(sw)))
return -ENOMEM;
}

34
drivers/thunderbolt/tb.h
View File

@ -947,17 +947,6 @@ static inline bool tb_switch_is_tiger_lake(const struct tb_switch *sw)
return false;
}
/**
* tb_switch_is_usb4() - Is the switch USB4 compliant
* @sw: Switch to check
*
* Returns true if the @sw is USB4 compliant router, false otherwise.
*/
static inline bool tb_switch_is_usb4(const struct tb_switch *sw)
{
return sw->config.thunderbolt_version == USB4_VERSION_1_0;
}
/**
* tb_switch_is_icm() - Is the switch handled by ICM firmware
* @sw: Switch to check
@ -1198,6 +1187,29 @@ static inline struct tb_retimer *tb_to_retimer(struct device *dev)
return NULL;
}
/**
* usb4_switch_version() - Returns USB4 version of the router
* @sw: Router to check
*
* Returns major version of USB4 router (%1 for v1, %2 for v2 and so
* on). Can be called to pre-USB4 router too and in that case returns %0.
*/
static inline unsigned int usb4_switch_version(const struct tb_switch *sw)
{
return FIELD_GET(USB4_VERSION_MAJOR_MASK, sw->config.thunderbolt_version);
}
/**
* tb_switch_is_usb4() - Is the switch USB4 compliant
* @sw: Switch to check
*
* Returns true if the @sw is USB4 compliant router, false otherwise.
*/
static inline bool tb_switch_is_usb4(const struct tb_switch *sw)
{
return usb4_switch_version(sw) > 0;
}
int usb4_switch_setup(struct tb_switch *sw);
int usb4_switch_read_uid(struct tb_switch *sw, u64 *uid);
int usb4_switch_drom_read(struct tb_switch *sw, unsigned int address, void *buf,

4
drivers/thunderbolt/tb_regs.h
View File

@ -190,8 +190,8 @@ struct tb_regs_switch_header {
u32 thunderbolt_version:8;
} __packed;
/* USB4 version 1.0 */
#define USB4_VERSION_1_0 0x20
/* Used with the router thunderbolt_version */
#define USB4_VERSION_MAJOR_MASK GENMASK(7, 5)
#define ROUTER_CS_1 0x01
#define ROUTER_CS_4 0x04