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[ Upstream commitb08134eb25] After initial start-up, the driver triggers ATI (calibration) with the newly loaded register configuration in place. Next, the driver polls a register field to ensure ATI completed in a timely fashion and that the device is ready to sense. However, communicating with the device over I2C while ATI is under- way may induce noise in the device and cause ATI to fail. As such, the vendor recommends not to poll the device during ATI. To solve this problem, let the device naturally signal to the host that ATI is complete by way of an interrupt. A completion prevents the device from successfully probing until this happens. As an added benefit, initial switch states are now reported in the interrupt handler at the same time ATI status is checked. As such, duplicate code that reports initial switch states has been removed from iqs269_input_init(). The former logic that scaled ATI timeout and filter settling delay is not carried forward with the new implementation, as it produces overly conservative delays at the lower clock rate. Rather, a single timeout that covers both clock rates is used. The filter settling delay does not happen to be necessary and has been removed as well. Fixes:04e49867fa("Input: add support for Azoteq IQS269A") Signed-off-by: Jeff LaBundy <jeff@labundy.com> Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com> Link: https://lore.kernel.org/r/Y7RtB2T7AF9rYMjK@nixie71 Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.