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In the TRX mode, if there was a nack signal at the hardware's tx, we can get start and nack ipd from the I2C_IPD register, which will enter nack process, send stop command, change the state to stop, and enter the handler of stop irq, but the stop irq may not be generated, it has a latency. So the log will like this: [ 69.961944] rk3x-i2c ff650000.i2c: unexpected irq in STOP: 0x10 [ 70.959690] rk3x-i2c ff650000.i2c: timeout, ipd: 0x00, state: 4 This error log will confuse us, it is not easier to locate the problem, we should get nack error at this time, and processing stop interrupt at the next, then complete this i2c job. Change-Id: I073ef288557b1b6f525d936e8f32d9d165c81ec4 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.