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3c61c786d2
When triggering I2S SE DMA transfers on the 6th Serial Element, we get
some timeouts and finally a fatal SMMU crash because the I2C6 lines
are shared with the secure firmware in order to handle the SMB1396
charger from the secure side.
In order to make thing work flawlessly we need to allow more SIDs
while running our SE DMA transfers, thus add the 0x3 mark to allow
the 0xa0 SID to trigger while we trigger an 0xa3 SID from Linux.
This crash doesn't happen on the QRD platform since the SE6 is
configured differently, with FIFO mode disabled, thus GPI DMA
is used and we cannot exercise SE DMA on this interface.
The crash only happens when large tranfers occurs (>32 bytes) since
the driver is designed to use the SE DMA in this case, and there's
no way to mark the SE DMA as disabled or mark the GPI DMA as
preferred since the FIFO/SE DMA will be used is FIFO is not disabled.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Fixes:
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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 reStructuredText 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.