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Date: Thu, 12 Nov 2020 07:55:23 +0100
From: Christian Eggers <ceggers@....de>
To: thunderbolt-software@...ts.01.org
Cc: Christian Kellner <christian@...lner.me>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Mario Limonciello <mario.limonciello@...l.com>,
Gil Fine <gil.fine@...el.com>, netdev@...r.kernel.org
Subject: thunderbolt: How to disconnect without physically unplugging
Hi,
sorry for asking "user" questions directly to developers. But I didn't find a
better place for asking.
I own a "hp zbook thunderbolt 3 dock". This docking station has 2 thunderbolt
connectors, the first (primary?) is connected to my personal laptop and the
other port I use for my company's laptop for working at home. It seems that
only one laptop at a time can access the dock peripherals (display port,
ethernet, usb) at a time.
Unfortunately there is no button for selecting the "active" port (like on a KVM
switch), so the only way for switching between the two laptops is pulling the
cable every time (unplugging the "active" laptop for a short period lets the
dock automatically switch to the "inactive" laptop).
Is there a possibility to do this "short disconnect" in software (either
- by raising an "unplug" sequence to to the thunderbolt itself, or
- by temporarily removing the thunderbolt controller from the PCI bus)?
My concern is that pulling the cables multiple times a day would wear out the
connectors quickly and render my hardware unusable. Additionally I see not much
value having two connectors on the dock when I have to manually plug cables
anyway (although the dock may offer the ability to establish a "thunderbolt
networking connection" between both laptops).
regards
Christian
# lspci
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers (rev 07)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 07)
00:14.0 USB controller: Intel Corporation 100 Series/C230 Series Chipset Family USB 3.0 xHCI Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation 100 Series/C230 Series Chipset Family Thermal Subsystem (rev 31)
00:15.0 Signal processing controller: Intel Corporation 100 Series/C230 Series Chipset Family Serial IO I2C Controller #0 (rev 31)
00:16.0 Communication controller: Intel Corporation 100 Series/C230 Series Chipset Family MEI Controller #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA Controller [AHCI Mode] (rev 31)
00:1b.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #17 (rev f1)
00:1c.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #1 (rev f1)
00:1c.1 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #2 (rev f1)
00:1c.4 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #5 (rev f1)
00:1d.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #9 (rev f1)
00:1f.0 ISA bridge: Intel Corporation CM236 Chipset LPC/eSPI Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation 100 Series/C230 Series Chipset Family Power Management Controller (rev 31)
00:1f.3 Audio device: Intel Corporation 100 Series/C230 Series Chipset Family HD Audio Controller (rev 31)
00:1f.4 SMBus: Intel Corporation 100 Series/C230 Series Chipset Family SMBus (rev 31)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (2) I219-LM (rev 31)
01:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961
02:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
04:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
05:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
05:01.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
05:02.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
05:04.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
06:00.0 System peripheral: Intel Corporation DSL6540 Thunderbolt 3 NHI [Alpine Ridge 4C 2015]
3b:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3c:00.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3c:01.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3c:02.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3c:03.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3c:04.0 PCI bridge: Intel Corporation DSL6540 Thunderbolt 3 Bridge [Alpine Ridge 4C 2015]
3d:00.0 USB controller: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller
3e:00.0 Ethernet controller: Broadcom Inc. and subsidiaries NetXtreme BCM57762 Gigabit Ethernet PCIe (rev 01)
6f:00.0 Non-Volatile memory controller: Toshiba Corporation NVMe Controller (rev 01)
# lspci -t -v
-[0000:00]-+-00.0 Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Host Bridge/DRAM Registers
+-02.0 Intel Corporation HD Graphics 530
+-04.0 Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
+-14.0 Intel Corporation 100 Series/C230 Series Chipset Family USB 3.0 xHCI Controller
+-14.2 Intel Corporation 100 Series/C230 Series Chipset Family Thermal Subsystem
+-15.0 Intel Corporation 100 Series/C230 Series Chipset Family Serial IO I2C Controller #0
+-16.0 Intel Corporation 100 Series/C230 Series Chipset Family MEI Controller #1
+-17.0 Intel Corporation Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA Controller [AHCI Mode]
+-1b.0-[01]----00.0 Samsung Electronics Co Ltd NVMe SSD Controller SM961/PM961
+-1c.0-[02]----00.0 Intel Corporation Wireless 8260
+-1c.1-[03]----00.0 Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader
+-1c.4-[04-6e]----00.0-[05-6e]--+-00.0-[06]----00.0 Intel Corporation DSL6540 Thunderbolt 3 NHI [Alpine Ridge 4C 2015]
| +-01.0-[07-39]--
| +-02.0-[3a]--
| \-04.0-[3b-6e]----00.0-[3c-6e]--+-00.0-[3d]----00.0 ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller
| +-01.0-[3e]----00.0 Broadcom Inc. and subsidiaries NetXtreme BCM57762 Gigabit Ethernet PCIe
| +-02.0-[3f]--
| +-03.0-[40]--
| \-04.0-[41-6e]--
+-1d.0-[6f]----00.0 Toshiba Corporation NVMe Controller
+-1f.0 Intel Corporation CM236 Chipset LPC/eSPI Controller
+-1f.2 Intel Corporation 100 Series/C230 Series Chipset Family Power Management Controller
+-1f.3 Intel Corporation 100 Series/C230 Series Chipset Family HD Audio Controller
+-1f.4 Intel Corporation 100 Series/C230 Series Chipset Family SMBus
\-1f.6 Intel Corporation Ethernet Connection (2) I219-LM
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