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Intel LPSS private register restoring in spi-pxa2xx.c: pxa2xx_spi_resume() was added before there was no any other code restoring them. This was changed after following commits for previous and current LPSS platforms:c78b083066("ACPI / LPSS: custom power domain for LPSS")41a3da2b8e("mfd: intel-lpss: Save register context on suspend") However there is one caveat: There is no LPSS private register context save/restore for the Intel Lynxpoint in the Linux kernel code. I did some debugging on one Lynxpoint based device I have and on it the LPSS register context is not lost over suspend/resume cycle (s2idle). Which happens for instance on Intel Braswell. I'm speculating but I guess either firmware does it or the LPSS is kept always on Lynxpoint. Given that we haven't needed to implement Lynxpoint LPSS I2C or UART private register context save/restore over four years time I think we are safe to remove this LPSS private register restoring during resume here. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.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.