cd5a46ce6f
The m_can driver sets and clears the CCCR.INIT bit during probe (both when testing the NON-ISO bit, and when configuring the chip). After clearing the CCCR.INIT bit, the transceiver enters normal mode, where it affects the CAN bus (i.e. it ACKs frames). This can cause troubles when the m_can node is only used for monitoring the bus, as one cannot setup listen-only mode before the device is probed. Rework the probe flow, so that the CCCR.INIT bit is only cleared when upping the device. First, the tcan4x5x driver is changed to stay in standby mode during/after probe. This in turn requires changes when setting bits in the CCCR register, as its CSR and CSA bits are always high in standby mode. Signed-off-by: Martin Hundebøll <martin@geanix.com> Reviewed-by: Markus Schneider-Pargmann <msp@baylibre.com> Tested-by: Markus Schneider-Pargmann <msp@baylibre.com> Link: https://lore.kernel.org/all/20240607105210.155435-1-martin@geanix.com Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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 reStructuredText 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.