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Linux kernel source tree
1bde4afcd1
For the Bay Trail or Cherry Trail SoC to enter the S0i3 power-level at s2idle suspend requires most of the hw-blocks / devices in the SoC to be in D3 when entering s2idle suspend. If some devices are not in D3 then the SoC will stay in a higher power state, consuming much more power from the battery then in S0i3. Use the new acpi_s2idle_dev_ops and acpi_register_lps0_dev() functionality to register a new s2idle check function which checks that all hardware blocks in the South complex (controlled by the PMC) are in a state that allows the SoC to enter S0i3 and prints an error message for any device in D0. Some blocks are not used on lower-featured versions of the SoC and these blocks will always report being in D0 on SoCs were they are not used. A false-positive mask is used to identify these blocks and for blocks in this mask the error is turned into a debug message to avoid false-positive error messages. Note the pmc_atom code is enabled by CONFIG_X86_INTEL_LPSS which already depends on ACPI. Signed-off-by: Johannes Stezenbach <js@sig21.net> Signed-off-by: Takashi Iwai <tiwai@suse.de> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> [hdegoede: Use acpi_s2idle_dev_ops, ignore fused off blocks, PMIC I2C] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Link: https://lore.kernel.org/r/20240305105915.76242-4-hdegoede@redhat.com Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> |
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| 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 | ||
| .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 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.