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We don't need the AUX power for the whole duration of the detect, only when we're doing AUX transfers. The AUX transfer function takes its own reference on the AUX power domain already. The two places during detect which access display core registers (not specific to a pipe/port/transcoder) only need the power domain that is required for that access. That power domain is equivalent to the device global power domain on most platforms (enabled whenever we hold a runtime PM reference) except on CHV/VLV where it's equivalent to the display power well. Add a new power domain that reflects the above, and use this at the two spots accessing registers. With that we can avoid taking the AUX reference for the whole duration of the detect function. Put the domains asynchronously to avoid the unneeded on-off-on toggling. Also adapt the idea from with_intel_runtime_pm et al. for making it easy to write short sequences where a display power ref is needed. v2: (Ville) - Add with_intel_display_power() helper to simplify things. - s/bool res/bool is_connected/ Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190509173446.31095-8-imre.deak@intel.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.
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.