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e17af1c9d8
During initalization of the DisplayPort controller an EV_HPD_INIT_SETUP event is generated, but with a delay of 100 units. This delay existed to circumvent bug in the QMP combo PHY driver, where if the DP part was powered up before USB, the common properties would not be properly initialized - and USB wouldn't work. This issue was resolved in the recent refactoring of the QMP driver, so it's now possible to remove this delay. While there is still a timing dependency in the current implementation, test indicates that it's now possible to boot with an external display on USB Type-C and have the display power up, without disconnecting and reconnecting the cable. Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com> Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Patchwork: https://patchwork.freedesktop.org/patch/518729/ Link: https://lore.kernel.org/r/20230117172951.2748456-1-quic_bjorande@quicinc.com Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
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.