From: Esther Shimanovich <eshimanovich@chromium.org>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Lukas Wunner <lukas@wunner.de>,
Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Rajat Jain <rajatja@google.com>
Subject: Re: [PATCH v4] PCI: Relabel JHL6540 on Lenovo X1 Carbon 7,8
Date: Thu, 25 Apr 2024 17:16:24 -0400 [thread overview]
Message-ID: <CA+Y6NJFyi6e7ype6dTAjxsy5aC80NdVOt+Vg-a0O0y_JsfwSGg@mail.gmail.com> (raw)
In-Reply-To: <20240424085608.GE112498@black.fi.intel.com>
Thank you for all your help!
On Tue, Apr 23, 2024 at 1:33 AM Mika Westerberg
<mika.westerberg@linux.intel.com> wrote:
>
> The other way I think is something like this:
>
> - If it does not have "usb4-host-interface" property (or behind a port
> that has that). These are all tunneled (e.g virtual).
>
> - It is directly connected to a PCIe root port with
> "ExternalFacingPort" and it has sibling device that is "Thunderbolt
> NHI". This is because you can only have "NHI" on a host router
> according to the USB4 spec.
>
I did find one example of a docking station that uses the DSL6540
chip, which has PCI IDs defined in include/linux/pci_ids.h:
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI 0x1577
#define PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE 0x1578
It seems like it has an NHI, despite being in an external, removable
docking station. This appears to contradict what you say about only
having "NHI" on a host router. I am assuming that by host router, you
mean the fixed discrete, fixed thunderbolt chip, or the thunderbolt
controller upstream to the root port. Please correct me if I got
anything wrong!
Looking at 18-241_ThunderboltController_Brief_HI.pdf, it seems like
these Alpine Ridge chips can be used either on a computer or a
peripheral. (Expected usage: Computer or peripheral)
So I'm not sure if finding an NHI would guarantee that the device is
not a peripheral. My original question was how to distinguish a
Thunderbolt controller that is on a removable peripheral, like a
docking station-- from one that is a discrete chip fixed to a computer
or upstream to the root port.
So unless I am misunderstanding something, it appears that my only
option is waiting for Lukas's patches. Please correct me if that is
not the case!
next prev parent reply other threads:[~2024-04-25 21:16 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-21 20:53 [PATCH v4] PCI: Relabel JHL6540 on Lenovo X1 Carbon 7,8 Esther Shimanovich
2023-12-21 23:15 ` Dmitry Torokhov
2023-12-27 0:15 ` Bjorn Helgaas
2023-12-28 13:25 ` Lukas Wunner
2023-12-28 13:39 ` Mika Westerberg
2024-01-17 21:21 ` Esther Shimanovich
2024-01-18 6:00 ` Mika Westerberg
2024-01-18 15:47 ` Mario Limonciello
2024-01-18 16:12 ` Dmitry Torokhov
2024-01-18 16:21 ` Dmitry Torokhov
2024-01-19 5:37 ` Mika Westerberg
2024-01-19 7:48 ` Mika Westerberg
2024-01-19 10:22 ` Mika Westerberg
2024-01-19 16:03 ` Esther Shimanovich
2024-01-22 6:10 ` Mika Westerberg
2024-01-22 23:50 ` Mario Limonciello
2024-01-23 6:18 ` Mika Westerberg
2024-01-25 23:45 ` Esther Shimanovich
2024-04-15 22:34 ` Esther Shimanovich
2024-04-16 5:03 ` Mika Westerberg
2024-04-18 19:43 ` Esther Shimanovich
2024-04-19 4:49 ` Mika Westerberg
2024-04-22 19:17 ` Esther Shimanovich
2024-04-22 19:21 ` Mario Limonciello
2024-04-23 5:33 ` Mika Westerberg
2024-04-23 8:31 ` Lukas Wunner
2024-04-23 8:40 ` Mika Westerberg
2024-04-23 16:59 ` Mario Limonciello
2024-04-24 8:56 ` Mika Westerberg
2024-04-25 21:16 ` Esther Shimanovich [this message]
2024-04-26 4:52 ` Mika Westerberg
2024-04-26 15:58 ` Esther Shimanovich
2024-04-27 5:35 ` Lukas Wunner
2024-04-27 7:41 ` Mika Westerberg
2024-04-27 7:08 ` Lukas Wunner
2024-04-27 15:09 ` Lukas Wunner
2024-05-01 22:23 ` Esther Shimanovich
2024-05-02 4:38 ` Mika Westerberg
2024-05-02 9:54 ` Mario Limonciello
2024-05-02 10:07 ` Mika Westerberg
2024-05-08 5:14 ` Lukas Wunner
2024-05-10 5:26 ` Mika Westerberg
2024-05-10 15:44 ` Esther Shimanovich
2024-05-11 4:38 ` Mika Westerberg
2024-05-11 5:43 ` Mika Westerberg
2024-05-15 18:53 ` Esther Shimanovich
2024-05-15 20:35 ` Lukas Wunner
2024-05-15 20:51 ` Lukas Wunner
2024-05-15 21:44 ` Esther Shimanovich
2024-05-16 8:30 ` Mika Westerberg
2024-05-16 10:03 ` Mika Westerberg
2024-05-16 9:16 ` Mika Westerberg
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