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Currently, the built-in 64-byte FIFO on the MCSPI controller is not enabled in PIO mode and is used only when DMA is enabled. Enable the FIFO in PIO mode by default for transactions larger than the FIFO depth and fallback only if FIFO is not available. When DMA is not enabled, it is efficient to enable the RX FIFO almost full and TX FIFO almost empty events after each FIFO fill instead of each word. Update omap2_mcspi_set_fifo() to enable the events accordingly and also rely on OMAP2_MCSPI_CHSTAT_RXS for the last transfer instead of the FIFO events to handle the case when the transfer size is not a multiple of FIFO depth. See J721E Technical Reference Manual (SPRUI1C), section 12.1.5 for further details: http://www.ti.com/lit/pdf/spruil1 Signed-off-by: Vaishnav Achath <vaishnav.a@ti.com> Link: https://lore.kernel.org/r/20231013092629.19005-1-vaishnav.a@ti.com Signed-off-by: Mark Brown <broonie@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.