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| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2019-12-17 15:33:40 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-18 15:38:55 +0100 |
| commit | b04079837b2094f09e145676eec4b9a56ae8a6aa (patch) | |
| tree | 53c6fc96150e61db8225c2210eb2e28dd8a2672f /drivers/thunderbolt/tunnel.c | |
| parent | 210e9f56e9e12472741b949950f9efcebf350750 (diff) | |
| download | lwn-b04079837b2094f09e145676eec4b9a56ae8a6aa.tar.gz lwn-b04079837b2094f09e145676eec4b9a56ae8a6aa.zip | |
thunderbolt: Add initial support for USB4
USB4 is the public specification based on Thunderbolt 3 protocol. There
are some differences in register layouts and flows. In addition to PCIe
and DP tunneling, USB4 supports tunneling of USB 3.x. USB4 is also
backward compatible with Thunderbolt 3 (and older generations but the
spec only talks about 3rd generation). USB4 compliant devices can be
identified by checking USB4 version field in router configuration space.
This patch adds initial support for USB4 compliant hosts and devices
which enables following features provided by the existing functionality
in the driver:
- PCIe tunneling
- Display Port tunneling
- Host and device NVM firmware upgrade
- P2P networking
This brings the USB4 support to the same level that we already have for
Thunderbolt 1, 2 and 3 devices.
Note the spec talks about host and device "routers" but in the driver we
still use term "switch" in most places. Both can be used interchangeably.
Co-developed-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Link: https://lore.kernel.org/r/20191217123345.31850-5-mika.westerberg@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/thunderbolt/tunnel.c')
| -rw-r--r-- | drivers/thunderbolt/tunnel.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/thunderbolt/tunnel.c b/drivers/thunderbolt/tunnel.c index 0d3463c4e24a..21d266a76b7d 100644 --- a/drivers/thunderbolt/tunnel.c +++ b/drivers/thunderbolt/tunnel.c @@ -243,6 +243,12 @@ struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up, return tunnel; } +static bool tb_dp_is_usb4(const struct tb_switch *sw) +{ + /* Titan Ridge DP adapters need the same treatment as USB4 */ + return tb_switch_is_usb4(sw) || tb_switch_is_titan_ridge(sw); +} + static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out) { int timeout = 10; @@ -250,8 +256,7 @@ static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out) int ret; /* Both ends need to support this */ - if (!tb_switch_is_titan_ridge(in->sw) || - !tb_switch_is_titan_ridge(out->sw)) + if (!tb_dp_is_usb4(in->sw) || !tb_dp_is_usb4(out->sw)) return 0; ret = tb_port_read(out, &val, TB_CFG_PORT, @@ -531,7 +536,7 @@ static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel) u32 val, rate = 0, lanes = 0; int ret; - if (tb_switch_is_titan_ridge(sw)) { + if (tb_dp_is_usb4(sw)) { int timeout = 10; /* |