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Instead of having quirks for systems that have a second fan it would be nice to detect this setup. Unfortunately, confirmed by the Lenovo FW team, there is no way to retrieve this information from the EC or BIOS. Recommendation was to attempt to read the fan and if successful then assume a 2nd fan is present. The fans are also supposed to spin up on boot for some time, so in theory we could check for a speed > 0. In testing this seems to hold true but as I couldn't test on all platforms I've avoided implementing this. It also breaks for the corner case where you load the module once the fans are idle. Tested on P1G4, P1G3, X1C9 and T14 (no fans) and it works correctly. For the platforms with dual fans where it was confirmed to work I have removed the quirks. Potentially this could be done for all platforms but I've left untested platforms in for now. On these platforms the fans will be enabled and then detected - so no impact. Signed-off-by: Mark Pearson <markpearson@lenovo.com> Link: https://lore.kernel.org/r/20220222185137.4325-1-markpearson@lenovo.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| 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 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.