[Bug 90060] [BDW Bisected]igt/pm_rpm/debugfs-read causes *ERROR* dpcd read (15 bytes at 0) failed (-110)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90060

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|bisect_pending              |
            Summary|[BDW                        |[BDW
                   |Regression]igt/pm_rpm/debug |Bisected]igt/pm_rpm/debugfs
                   |fs-read causes *ERROR* dpcd |-read causes *ERROR* dpcd
                   |read (15 bytes at 0) failed |read (15 bytes at 0) failed
                   |(-110)                      |(-110)

--- Comment #3 from lu hua <huax.lu at intel.com> ---
prts bisected it.
commit aa7471d228eb6dfddd0d201ea9746d6a2020972a
Author:     Jani Nikula <jani.nikula at intel.com>
AuthorDate: Wed Apr 1 11:15:21 2015 +0300
Commit:     Daniel Vetter <daniel.vetter at ffwll.ch>
CommitDate: Tue Apr 7 10:27:28 2015 +0200

    drm/i915: add i915 specific connector debugfs file for DPCD

    Occasionally it would be interesting to read some of the DPCD registers
    for debug purposes, without having to resort to logging. Add an i915
    specific i915_dpcd debugfs file for DP and eDP connectors to dump parts
    of the DPCD. Currently the DPCD addresses to be dumped are statically
    configured, and more can be added trivially.

    The implementation also makes it relatively easy to add other i915 and
    connector specific debugfs files in the future, as necessary.

    This is currently i915 specific just because there's no generic way to
    do AUX transactions given just a drm_connector. However it's all pretty
    straightforward to port to other drivers.

    v2: Add more DPCD registers to dump.

    Signed-off-by: Jani Nikula <jani.nikula at intel.com>
    Reviewed-by: Bob Paauwe <bob.j.paauwe at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

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