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The driver currently supports only the sync read/write operation i.e., it waits for the DMA transfer to complete before returning to the caller (MHI stack). But it is sub-optimal and defeats the actual purpose of using DMA. So let's add support for DMA async read/write operation by skipping the DMA transfer completion and returning to the caller immediately. When the completion actually happens later, the driver will be notified using the DMA completion handler and in turn it will notify the caller using the newly introduced callback in "struct mhi_ep_buf_info". Since the DMA completion handler is invoked from the interrupt context, a separate workqueue (epf_mhi->dma_wq) is used to notify the caller about the completion of the transfer. Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Krzysztof Wilczyński <kw@linux.com> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.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.