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The etnaviv device is a virtual device backing the DRM device, which may drive multiple hardware GPU core devices. As most of the dma-mapping handling is done through the virtual device, we need to make sure that a proper DMA setup is in place. The easiest way to get a reasonable configuration is to let the virtual device share the DMA configuration with one of the GPU devices, so call of_dma_configure() with the right parameters manually. This assumes that all etnaviv driven GPU devices in the system share the same DMA configuration. If we ever encounter a SoC where the GPUs are on busses with different offsets or behind different IOMMUs that will require much deeper changes to the driver, as we would need to implement etnaviv specific versions of most of the DRM helper functions. For now we should be fine with this solution. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Tested-by: Guido Günther <agx@sigxcpu.org> Tested-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.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.