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d91105e056
CAL HW interrupts are inherently racy. If we get both start and end interrupts, we don't know what has happened: did the DMA for a single frame start and end, or did one frame end and a new frame start? Usually for normal pixel frames we get the interrupts separately. If we do get both, we have to guess. The assumption in the code is that the active vertical area is larger than the blanking vertical area, and thus it is more likely that we get the end of the old frame and the start of a new frame. However, for embedded data, which is only a few lines high, we always get both interrupts. Here the assumption is that we get both for the same frame. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@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.