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25386c9a01
MCP251XFD_REG_OSC is the first register the driver reads from. The chip may be in deep sleep and the SPI transfer (i.e. the assertion of the CS) will wake the chip up. This takes about 3ms. The CRC of this transfer is wrong, or there isn't any chip at all, in this case the CRC will be wrong, too. The driver ignores the CRC error and returns the read data to the caller. To avoid any confusion, this patch changes the mcp251xfd_regmap_crc_read() function to only ignore the CRC error if solely the OSC register is read. So when reading more than the OSC registers at once, CRC errors are not ignored. Link: https://lore.kernel.org/all/20220207131047.282110-3-mkl@pengutronix.de 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 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.