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Mika Westerberg a3301461f3 thunderbolt: Improve redrive mode handling 
commit 24740385cb upstream.

When USB-C monitor is connected directly to Intel Barlow Ridge host, it
goes into "redrive" mode that basically routes the DisplayPort signals
directly from the GPU to the USB-C monitor without any tunneling needed.
However, the host router must be powered on for this to work. Aaron
reported that there are a couple of cases where this will not work with
the current code:

  - Booting with USB-C monitor plugged in.
  - Plugging in USB-C monitor when the host router is in sleep state
    (runtime suspended).
  - Plugging in USB-C device while the system is in system sleep state.

In all these cases once the host router is runtime suspended the picture
on the connected USB-C display disappears too. This is certainly not
what the user expected.

For this reason improve the redrive mode handling to keep the host
router from runtime suspending when detect that any of the above cases
is happening.

Fixes: a75e0684ef ("thunderbolt: Keep the domain powered when USB4 port is in redrive mode")
Reported-by: Aaron Rainbolt <arainbolt@kfocus.org>
Closes: https://lore.kernel.org/linux-usb/20241009220118.70bfedd0@kf-ir16/
Cc: stable@vger.kernel.org
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2024-12-27 13:52:56 +01:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.