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251e48a1db
Currently, each screen update triggers an I2C transfer of all screen data, up to 1 KiB of data for a 128x64 display, which takes at least 20 ms in Fast mode. Reduce the amount of transferred data by only updating the rectangle that changed. Remove the calls to ssd1307fb_set_col_range() and ssd1307fb_set_page_range() during initialization, as ssd1307fb_update_rect() now takes care of that. Note that for now the optimized operation is only used for fillrect, copyarea, and imageblit, which are used by fbcon. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210727134730.3765898-5-geert@linux-m68k.org
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.