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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2019-03-26 15:52:30 +0300 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2019-11-02 12:13:31 +0300 |
| commit | 8afe909b78e16ee4baecf78fd4e404aabf425f8c (patch) | |
| tree | 99323dee80fdda2733e71a9950e45d5b7464549e /drivers/thunderbolt/tb.h | |
| parent | de718ac7b6aefa594d5d95881882bc68ec3b83b6 (diff) | |
| download | linux-8afe909b78e16ee4baecf78fd4e404aabf425f8c.tar.xz | |
thunderbolt: Add Display Port adapter pairing and resource management
To perform proper Display Port tunneling for Thunderbolt 3 devices we
need to allocate DP resources for DP IN port before they can be used.
The reason for this is that the user can also connect a monitor directly
to the Type-C ports in which case the Thunderbolt controller acts as
re-driver for Display Port (no tunneling takes place) taking the DP
sinks away from the connection manager. This allocation is done using
special sink allocation registers available through the link controller.
We can pair DP IN to DP OUT only if
* DP IN has sink allocated via link controller
* DP OUT port receives hotplug event
For DP IN adapters (only for the host router) we first query whether
there is DP resource available (it may be the previous instance of the
driver for example already allocated it) and if it is we add it to the
list. We then update the list when after each plug/unplug event to a DP
IN/OUT adapter. Each time the list is updated we try to find additional
DP IN <-> DP OUT pairs for tunnel establishment. This strategy also
makes it possible to establish another tunnel in case there are 3
monitors connected and one gets unplugged releasing the DP IN adapter
for the new tunnel.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/tb.h')
| -rw-r--r-- | drivers/thunderbolt/tb.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tb.h b/drivers/thunderbolt/tb.h index 3d7b2202d248..5311e6e3f3df 100644 --- a/drivers/thunderbolt/tb.h +++ b/drivers/thunderbolt/tb.h @@ -137,6 +137,7 @@ struct tb_switch { * @link_nr: Is this primary or secondary port on the dual_link. * @in_hopids: Currently allocated input HopIDs * @out_hopids: Currently allocated output HopIDs + * @list: Used to link ports to DP resources list */ struct tb_port { struct tb_regs_port_header config; @@ -152,6 +153,7 @@ struct tb_port { u8 link_nr:1; struct ida in_hopids; struct ida out_hopids; + struct list_head list; }; /** @@ -650,6 +652,10 @@ static inline bool tb_switch_is_icm(const struct tb_switch *sw) int tb_switch_lane_bonding_enable(struct tb_switch *sw); void tb_switch_lane_bonding_disable(struct tb_switch *sw); +bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in); +int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in); +void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in); + int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged); int tb_port_add_nfc_credits(struct tb_port *port, int credits); int tb_port_set_initial_credits(struct tb_port *port, u32 credits); @@ -694,6 +700,9 @@ int tb_lc_configure_link(struct tb_switch *sw); void tb_lc_unconfigure_link(struct tb_switch *sw); int tb_lc_set_sleep(struct tb_switch *sw); bool tb_lc_lane_bonding_possible(struct tb_switch *sw); +bool tb_lc_dp_sink_query(struct tb_switch *sw, struct tb_port *in); +int tb_lc_dp_sink_alloc(struct tb_switch *sw, struct tb_port *in); +int tb_lc_dp_sink_dealloc(struct tb_switch *sw, struct tb_port *in); static inline int tb_route_length(u64 route) { |