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If the slave hold the scl low for a long time, we will send the stop because the i2c transfer is timeout. Then reset the slave, the scl will be released to high by slave, the data hold low, but the controller's state is messy now, need to diable i2c controller, it is better to reset i2c controller, it will go back to normal state. The log like this: [ 117.444700] rk3x-i2c ff3d0000.i2c: timeout, ipd: 0x93, state: 2 [ 118.466410] rk3x-i2c ff3d0000.i2c: timeout, ipd: 0x00, state: 1 [ 119.486217] rk3x-i2c ff3d0000.i2c: timeout, ipd: 0x00, state: 1 or [ 91.733176] rk3x-i2c ff3d0000.i2c: timeout, ipd: 0x80, state: 1 [ 103.406776] rk3x-i2c ff3d0000.i2c: timeout, ipd: 0x00, state: 2 [ 104.426636] rk3x-i2c ff3d0000.i2c: timeout, ipd: 0x00, state: 2 Change-Id: I53e6e383c849cea22d870f9488c23720e74115df Signed-off-by: David Wu <david.wu@rock-chips.com>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.