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[ Upstream commit 6942635032cfd3e003e980d2dfa4e6323a3ce145 ] On some devices (e.g. Samsung Galaxy A5 (2015)), the bootloader seems to keep interrupts enabled for SM5502 when booting Linux. Changing the cable state (i.e. plugging in a cable) - until the driver is loaded - will therefore produce an interrupt that is never read. In this situation, the cable state will be stuck forever on the initial state because SM5502 stops sending interrupts. This can be avoided by clearing those pending interrupts after the driver has been loaded. One way to do this is to reset all registers to default state by writing to SM5502_REG_RESET. This ensures that we start from a clean state, with all interrupts disabled. Suggested-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.