diff options
| author | Mika Westerberg <mika.westerberg@linux.intel.com> | 2020-02-18 16:14:42 +0200 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2021-02-04 10:45:25 +0300 |
| commit | c6da62a219d028de10f2e22e93a34c7ee2b88d03 (patch) | |
| tree | d8bf3538e6d14399f17ae2a51249ba5aaf9b8d17 /drivers/thunderbolt/nhi.c | |
| parent | 5a6a2c0f0f43676df27632d657a3f18b151a7ef8 (diff) | |
| download | linux-c6da62a219d028de10f2e22e93a34c7ee2b88d03.tar.bz2 | |
thunderbolt: Add support for native USB4 _OSC
ACPI 6.4 introduced a new _OSC capability used to negotiate whether the
OS is supposed to use Software (native) or Firmware based Connection
Manager. If the native support is granted then there are set of bits
that enable/disable different tunnel types that the Software Connection
Manager is allowed to tunnel.
This adds support for this new USB4 _OSC accordingly. When PCIe
tunneling is disabled then the driver switches security level to be
"nopcie" following the security level 5 used in Firmware based
Connection Manager.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Diffstat (limited to 'drivers/thunderbolt/nhi.c')
| -rw-r--r-- | drivers/thunderbolt/nhi.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c index 782404eb10b0..a0386d1e3fc9 100644 --- a/drivers/thunderbolt/nhi.c +++ b/drivers/thunderbolt/nhi.c @@ -1190,6 +1190,29 @@ static void tb_apple_add_links(struct tb_nhi *nhi) } } +static struct tb *nhi_select_cm(struct tb_nhi *nhi) +{ + struct tb *tb; + + /* + * USB4 case is simple. If we got control of any of the + * capabilities, we use software CM. + */ + if (tb_acpi_is_native()) + return tb_probe(nhi); + + /* + * Either firmware based CM is running (we did not get control + * from the firmware) or this is pre-USB4 PC so try first + * firmware CM and then fallback to software CM. + */ + tb = icm_probe(nhi); + if (!tb) + tb = tb_probe(nhi); + + return tb; +} + static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct tb_nhi *nhi; @@ -1258,9 +1281,7 @@ static int nhi_probe(struct pci_dev *pdev, const struct pci_device_id *id) tb_apple_add_links(nhi); tb_acpi_add_links(nhi); - tb = icm_probe(nhi); - if (!tb) - tb = tb_probe(nhi); + tb = nhi_select_cm(nhi); if (!tb) { dev_err(&nhi->pdev->dev, "failed to determine connection manager, aborting\n"); |