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Currently icl_compute_tc_phy_dplls() assumes that the active PLL will be the TC PLL (as opposed to the TBT PLL). The actual PLL will be selected during the modeset enable sequence, but we need to put *something* into the crtc_state->shared_dpll already during compute_config(). The downside of assuming one PLL or the other is that we'll fail to fastset if the assumption doesn't match what was in use previously. So let's instead keep the same PLL that was in use previously (assuming there was one). This should allow fastset to work again when using TBT PLL, at least in the steady state. Now, assuming we want keep the same PLL may not be entirely correct either. But we should be covered by the type-c link reset handling which will force a full modeset by flagging connectors_changed=true which means the resulting modeset can't be converted into a fastset even if the full crtc state looks identical. Cc: Imre Deak <imre.deak@intel.com> Cc: Suraj Kandpal <suraj.kandpal@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240118142436.25928-1-ville.syrjala@linux.intel.com Reviewed-by: Suraj Kandpal <suraj.kandpal@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.