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| author | Sanath S <Sanath.S@amd.com> | 2024-01-13 11:52:48 +0200 |
|---|---|---|
| committer | Mika Westerberg <mika.westerberg@linux.intel.com> | 2024-01-22 13:21:06 +0200 |
| commit | 59a54c5f3dbde00b8ad30aef27fe35b1fe07bf5c (patch) | |
| tree | 0d4f433a41c3b6d9dabc1a076d7b45f0c6437f1b /drivers/thunderbolt/domain.c | |
| parent | ec8162b3f0683ae08a21f20517cf49272b07ee0b (diff) | |
| download | lwn-59a54c5f3dbde00b8ad30aef27fe35b1fe07bf5c.tar.gz lwn-59a54c5f3dbde00b8ad30aef27fe35b1fe07bf5c.zip | |
thunderbolt: Reset topology created by the boot firmware
Boot firmware (typically BIOS) might have created tunnels of its own.
The tunnel configuration that it does might be sub-optimal. For instance
it may only support HBR2 monitors so the DisplayPort tunnels it created
may limit Linux graphics drivers. In addition there is an issue on some
AMD based systems where the BIOS does not allocate enough PCIe resources
for future topology extension. By resetting the USB4 topology the PCIe
links will be reset as well allowing Linux to re-allocate.
This aligns the behavior with Windows Connection Manager.
We already issued host router reset for USB4 v2 routers, now extend it
to USB4 v1 routers as well. For pre-USB4 (that's Apple systems) we leave
it as is and continue to discover the existing tunnels.
Suggested-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Sanath S <Sanath.S@amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/domain.c')
| -rw-r--r-- | drivers/thunderbolt/domain.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/thunderbolt/domain.c b/drivers/thunderbolt/domain.c index 9fb1a64f3300..df0d845e069a 100644 --- a/drivers/thunderbolt/domain.c +++ b/drivers/thunderbolt/domain.c @@ -423,6 +423,7 @@ err_free: /** * tb_domain_add() - Add domain to the system * @tb: Domain to add + * @reset: Issue reset to the host router * * Starts the domain and adds it to the system. Hotplugging devices will * work after this has been returned successfully. In order to remove @@ -431,7 +432,7 @@ err_free: * * Return: %0 in case of success and negative errno in case of error */ -int tb_domain_add(struct tb *tb) +int tb_domain_add(struct tb *tb, bool reset) { int ret; @@ -460,7 +461,7 @@ int tb_domain_add(struct tb *tb) /* Start the domain */ if (tb->cm_ops->start) { - ret = tb->cm_ops->start(tb); + ret = tb->cm_ops->start(tb, reset); if (ret) goto err_domain_del; } |