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1cb3cbe732
Mali DP500 behaves differently from the rest of the Mali DP IP, in that it does not have a one-shot mode and keeps writing the content of the current frame to the provided memory area until stopped. As a way of emulating the one-shot behaviour, we are going to use the CVAL interrupt that is being raised at the start of each frame, during prefetch phase, to act as End-of-Write signal, but with a twist: we are going to disable the memory write engine right after we're notified that it has been enabled, using the knowledge that the bit controlling the enabling will only be acted upon on the next vblank/prefetch. CVAL interrupt will fire durint the next prefetch phase every time the global CVAL bit gets set, so we need a state byte to track the memory write enabling. We also need to pay attention during the disabling of the memory write engine as that requires the CVAL bit to be set in the control register, but we don't want to do that during an atomic commit, as it will write into the hardware a partial state. Reviewed-by: Brian Starkey <brian.starkey@arm.com> Signed-off-by: Liviu Dudau <liviu.dudau@arm.com> |
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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.
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.