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To better understand error that can be detected by the DMA controller, manage the error flags before the transfer flags. This way, it is possible to know if the FIFO error flag is set for an over/underrun condition or a FIFO level error. When a FIFO over/underrun condition occurs, the data is not lost because peripheral request is not acknowledged by the stream until the over/ underrun condition is cleared. If this acknowledge takes too much time, the peripheral itself may detect an over/underrun condition of its internal buffer and data might be lost. That's why in case the FIFO error flag is set, we check if the channel is disabled or not, and if a Transfer Complete flag is set, which means that the channel is disabled because of the end of transfer. Because channel is disabled by hardware either by a FIFO level error, or by an end of transfer. Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com> Link: https://lore.kernel.org/r/20201120143320.30367-2-amelie.delaunay@st.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
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.