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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_regs.h | |
| parent | thunderbolt: Add Display Port CM handshake for Titan Ridge devices (diff) | |
| download | linux-dev-8afe909b78e16ee4baecf78fd4e404aabf425f8c.tar.xz linux-dev-8afe909b78e16ee4baecf78fd4e404aabf425f8c.zip | |
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_regs.h')
| -rw-r--r-- | drivers/thunderbolt/tb_regs.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/thunderbolt/tb_regs.h b/drivers/thunderbolt/tb_regs.h index 8d11b4a2d552..aec35e61cc14 100644 --- a/drivers/thunderbolt/tb_regs.h +++ b/drivers/thunderbolt/tb_regs.h @@ -295,6 +295,12 @@ struct tb_regs_hop { #define TB_LC_DESC_PORT_SIZE_SHIFT 16 #define TB_LC_DESC_PORT_SIZE_MASK GENMASK(27, 16) #define TB_LC_FUSE 0x03 +#define TB_LC_SNK_ALLOCATION 0x10 +#define TB_LC_SNK_ALLOCATION_SNK0_MASK GENMASK(3, 0) +#define TB_LC_SNK_ALLOCATION_SNK0_CM 0x1 +#define TB_LC_SNK_ALLOCATION_SNK1_SHIFT 4 +#define TB_LC_SNK_ALLOCATION_SNK1_MASK GENMASK(7, 4) +#define TB_LC_SNK_ALLOCATION_SNK1_CM 0x1 /* Link controller registers */ #define TB_LC_PORT_ATTR 0x8d |