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[ Upstream commit 76d3ca89981354e1f85a3e0ad9ac4217d351cc72 ] I was wondering why there's garbage at the bottom of the screen when tile blitting is used with an odd mode like 1080, 600 or 200. Sure there's only space for half a tile but the same area is clean when the buffer is bitmap. Then later I found that it's supposed to be cleaned but that's not implemented. So I took what's in bitblit and adapted it for tileblit. This implementation was tested for both the horizontal and vertical case, and now does the same as what's done for bitmap buffers. If anyone is interested to reproduce the problem then I could bet that'd be on a S3 or Ark. Just set up a mode with an odd line count and make sure that the virtual size covers the complete tile at the bottom. E.g. for 600 lines that's 608 virtual lines for a 16 tall tile. Then the bottom area should be cleaned. For the right side it's more difficult as there the drivers won't let an odd size happen, unless the code is modified. But once it reports back a few pixel columns short then fbcon won't use the last column. With the patch that column is now clean. Btw. the virtual size should be rounded up by the driver for both axes (not only the horizontal) so that it's dividable by the tile size. That's a driver bug but correcting it is not in scope for this patch. Implement missing margin clearing for tileblit Signed-off-by: Zsolt Kajtar <soci@c64.rulez.org> Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.