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This change will allow platform designers better control over signal integrity by allowing them to tune the HS200 and HS400 driver strengths. The driver strength was previously hard coded to A to solve boot problems with certain platforms. This driver strength does not universally apply to all platforms so we need a knob to adjust it. All older platforms currently have the SDR104 preset hard coded to A in the firmware. This means that switching from the hard coded value in the kernel to reading the SDR104 preset is a no-op for these platforms. Newer platforms will have properly set presets. So this change will support both new and old platforms. Signed-off-by: Raul E Rangel <rrangel@chromium.org> Signed-off-by: Victor Ding <victording@google.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Link: https://lore.kernel.org/r/20201027084612.528301-1-victording@google.com Signed-off-by: Ulf Hansson <ulf.hansson@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.