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e11ffddba1
It looks like simply writing all the cursor register every single time might be slightly faster than checking to see of each of them need to be written. So if any other register apart from CURPOS needs to be written let's just write all the registers. CURPOS is left as a special case mainly for 845/865 where we have to disable the cursor to change many of the cursor parameters. This introduces a slight chance of the cursor flickering when things get updated (since we're not currently doing the vblank evade for cursor updates). If we write CURPOS alone then that obviously can't happen. And let's follow the same pattern in the i9xx code just for symmetry. I wasn't able to see a singificant performance difference between this and just writing all the registers unconditionally. Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170327185546.2977-16-ville.syrjala@linux.intel.com Reviewed-by: Imre Deak <imre.deak@intel.com> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.