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Add functions to perform block read and write operations. This applies for cases where the requested operation is for >8 bytes of data. When not using the block mode transfer, the driver will attempt a series of 8 byte i2c operations until it reaches the desired total. For example, for a 40 byte request the driver will complete 5 separate transactions. This results in large transactions taking a significant amount of time to process. Add block mode such that the driver can request larger transactions, up to 1024 bytes per transfer. Many aspects of the block mode transfer is common with the regular 8 byte operations. Use generic functions for parts of the message construction and sending the message. The key difference for the block mode is the usage of separate FIFO buffer to store data. Write to this buffer in the case of a write (before command send). Read from this buffer in the case of a read (after command send). Data is written into this buffer by placing data into the MSB onwards. This means the bottom 8 bits of the data will match the top 8 bits, and so on and so forth. Set specific bits in message for block mode, enable block mode transfers from global i2c management registers, construct message, send message, read or write from FIFO buffer as required. The block-mode transactions result in a significant speed increase in large i2c requests. Signed-off-by: Aryan Srivastava <aryan.srivastava@alliedtelesis.co.nz> Link: https://lore.kernel.org/r/20250324192946.3078712-2-aryan.srivastava@alliedtelesis.co.nz Signed-off-by: Andi Shyti <andi.shyti@kernel.org> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.