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| Filename | Latest commit message | Latest commit date |
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a18b219294
This is something we've needed for a very long time now, as it makes debugging issues with faulty MST hubs along with debugging issues regarding us interfacing with hubs correctly vastly easier to debug. Currently this can actually be done if you trace the i2c devices for DP using ftrace but that's significantly less useful for a couple of reasons: - Tracing the i2c devices through ftrace means all of the traces are going to contain a lot of "garbage" output that we're sending over the i2c line. Most of this garbage comes from retrying transactions, DRM's helper library adding extra transactions to work around bad hubs, etc. - Having a user set up ftrace so that they can provide debugging information is a lot more difficult then being able to say "just boot with drm.debug=0x100" - We can potentially expand upon this tracing in the future to print debugging information in regards to other DP transactions like MST sideband transactions This is inspired by a patch Rob Clark sent to do this a long time back. Neither of us could find the patch however, so we both assumed it would probably just be easier to rewrite it anyway. Cc: Rob Clark <robdclark@gmail.com> Signed-off-by: Lyude Paul <lyude@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180716154432.13433-1-lyude@redhat.com |
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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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.