Linux mainline fork with MSM8998 patches | https://mainline.space | Currently supported devices:
OnePlus 5/5T, Xiaomi Mi 6, F(x)tec Pro¹ (2019 QX1000 model) & Sony Xperia XZ Premium (UNTESTED!)
394088f0b0
The I2C-bus to the XPower AXP288 is shared between the Linux kernel and the SoCs P-Unit. The P-Unit has a semaphore which the kernel must "lock" before it may use the bus and while the kernel holds the semaphore the CPU and GPU power-states must not be changed otherwise the system will freeze. This is a complex process, which is quite expensive. This is all done by iosf_mbi_block_punit_i2c_access(). To ensure that no unguarded I2C-bus accesses happen, iosf_mbi_block_punit_i2c_access() gets called by the I2C-bus-driver for every I2C transfer. Because this is so expensive it is allowed to call iosf_mbi_block_punit_i2c_access() in a nested fashion, so that higher-level code which does multiple I2C-transfers can call it once for a group of transfers, turning the calls done by the I2C-bus-driver into no-ops. Userspace power-supply API users typically will read all provided properties in one go, refreshing the last read values when power_supply_changed() is called by the driver and/or periodically (e.g. every 2 minutes). The reading of all properties in one go causes the P-Unit semaphore to quickly be taken and released multiple times in a row. Certain PMIC registers like AXP20X_FG_RES are even used in multiple properties so they get read multiple times, leading to a P-Unit take + release each time the register is read. As already mentioned the taking of the P-Unit semaphore is a quite expensive operation and it has also been reported that the "hammering" of the P-Unit semaphore done by the axp288_fuel_gauge driver can even cause stability issues with the system as a whole. Switch over to a scheme where the axp288_fuel_gauge driver keeps a local copy of all the registers which it uses for properties and make it only refresh its copy of the registers if the values are older then 1 minute; or when a fuel-gauge interrupt has triggered since the last read. This not only reduces the amount of reads, it also makes the code do all the reads in one go, rather then reading specific registers based on which property is being queried. This allows calling iosf_mbi_block_punit_i2c_access() once before doing all the reads, so that we now only take the P-Unit semaphore once per update. Tested-by: Andrejus Basovas <cpp@gcc.lt> Signed-off-by: Andrejus Basovas <cpp@gcc.lt> Co-developed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.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.