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During some fatal firmware error conditions, the PCI config space register 0x2e which normally contains the subsystem ID will become 0xffff. This register will revert back to the normal value after the chip has completed core reset. If we detect this condition, we can poll this config register immediately for the value to revert. Because we use config read cycles to poll this register, there is no possibility of Master Abort if we happen to read it during core reset. This speeds up recovery significantly as we don't have to wait for the conservative min_time before polling MMIO to see if the firmware has come out of reset. As soon as this register changes value we can proceed to re-initialize the device. Reviewed-by: Edwin Peer <edwin.peer@broadcom.com> Reviewed-by: Vasundhara Volam <vasundhara-v.volam@broadcom.com> Reviewed-by: Andy Gospodarek <gospo@broadcom.com> Signed-off-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.