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Some devices have an erratum such that they only support DWORD accesses to some registers. E.g., this Bayhub O2 device ([VID:DID] = [0x1217:0x8621]) only supports DWORD accesses to LTR latency registers and L1 PM substates control registers: https://github.com/rajatxjain/public_shared/blob/main/OZ711LV2_appnote.pdf The L1 PM substate control registers are DWORD sized, and hence their access in the kernel is already DWORD sized, so we don't need to do anything for them. However, the LTR registers being WORD sized, are in need of a solution. Convert the WORD sized accesses to these registers into DWORD sized accesses while saving and restoring them. Link: https://lore.kernel.org/r/20211222012105.3438916-1-rajatja@google.com Signed-off-by: Rajat Jain <rajatja@google.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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.