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0aded171e2
When adding the early latency==0 check back I neglected to realize that we no longer have a way to return a failure from the wm computation like we had in the past (since we now calculate wms before ddb allocations). Also plane_en being false doesn't actually indicate that the level is invalid as it wil also happen when the plane is not enabled. skl_allocate_pipe_ddb() starts scanning from the maximum watermark level and it stops as soon as it finds a level that is deemed viable. The assumption being that if level n+1 is valid then level n is valid as well. Thus if we now disable any watermark level by zeroing its latency the code will think that level to be actually valid and won't confirm whether the actually enabled lower watermark level(s) actually fit into the allotted ddb space. This results in hilarious watermark values that exceed the ddb allocation of the plane. The way we must now indicate a failure is to assign an unreasoanbly big value to min_ddb_alloc which will then make skl_allocate_pipe_ddb() reject the entire level. v2: Also do the same for the lines>31 case (Matt) v3: Make 'blocks' u32 (Matt) Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190205155053.10081-1-ville.syrjala@linux.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.