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525280552b
So far we got an AUX power domain reference only for the duration of DP AUX transfers. However, the following suggests that we also need these for main link functionality: - The specification doesn't state whether it's needed or not for main link functionality, but suggests that these power wells need to be enabled already during display core initialization (Sequences to Initialize Display). - For PSR we need to keep the AUX power well enabled. - On ICL combo PHY ports (non-TC) the AUX power well is needed for link training too: while the port is enabled with a DP link training test pattern trying to toggle the AUX power well will time out. - On ICL MG PHY ports (TC) the AUX power well is needed also for main link functionality (both in DP and HDMI modes). - Windows enables these power wells both for main and AUX lane functionality. Based on the above take an AUX power reference for main link functionality too. This makes a difference only on GEN10+ (GLK+) platforms, where we have separate port specific AUX power wells. For PSR we still need to distinguish between port A and the other ports, since on port A DC states must stay enabled for main link functionality, but DC states must be disabled for driver initiated AUX transfers. So re-use the corresponding helper from intel_psr.c. Since we take now a reference for main link functionality on all DP ports we can forgo taking the separate power ref for PSR functionality. v2: - Make sure DC states stay enabled when taking the ref on port A. (Ville) v3: (Ville) - Fix comment about logic for encoders without a crtc state and add FIXME note for a simplification to avoid calling get_power_domains in such cases. - Use intel_crtc_has_dp_encoder() instead !intel_crtc_has_type(HDMI). Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> [Clarified code comments in intel_ddi_main_link_aux_domain() and intel_ddi_get_power_domains() (Imre)] Reviewed-by: José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180621184449.26634-1-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.
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.