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Currently we don't call intel_crtc_prepare_cleared_state() for crtcs that are going to be entirely disabled (uapi.enable==false). That means such crtcs will leave stale junk lying around in their states and we have to sprinkle hw.enable checks all over before we can look at the states. Let's change that a bit so that we aways do the state clearing, even for fully disabled crtcs. Note that we still keep some parts of the old state (see intel_crtc_prepare_cleared_state() for the details) so probably can't trust things 100% when hw.enable==false. But at least there's less chance now that we end up looking at stale junk. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200115190813.17971-2-ville.syrjala@linux.intel.com Reviewed-by: José Roberto de Souza <jose.souza@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.