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bca774c387
On ADLP+ Bspec allows DC5/6 to be enabled while power well 2 is enabled.
Since the AUX and DDI power wells (except for port A/B) are also backed
by power well 2, this would suggest that DC5/6 can be enabled while any
of these AUX or DDI port functionalities are used. As opposed to this
AUX transfers will time out on ADLP TypeC ports while DC6 is enabled.
Until the restriction for DC5/6 is clarified in Bspec let's assume that
the intention is to allow for using these power states while pipe A/B is
enabled, but only for combo ports which can be used with eDP outputs.
Similarly assume that AUX transaction initiated by the driver on any port
requires DC states to be disabled.
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Fixes: 88c4879384 ("drm/i915: Use separate "DC off" power well for ADL-P and DG2")
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230424200205.1732941-1-imre.deak@intel.com
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.