fcb461e2bc
There is an issue that when PCIe switch is connected to an Armada 3700 board, there will be lots of warnings about PIO errors when reading the config space. According to Aardvark PIO read and write sequence in HW specification, the current way to check PIO status has the following issues: 1) For PIO read operation, it reports the error message, which should be avoided according to HW specification. 2) For PIO read and write operations, it only checks PIO operation complete status, which is not enough, and error status should also be checked. This patch aligns the code with Aardvark PIO read and write sequence in HW specification on PIO status check and fix the warnings when reading config space. [pali: Fix CRS handling when CRSSVE is not enabled] Link: https://lore.kernel.org/r/20210722144041.12661-2-pali@kernel.org Tested-by: Victor Gu <xigu@marvell.com> Signed-off-by: Evan Wang <xswang@marvell.com> Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Reviewed-by: Victor Gu <xigu@marvell.com> Reviewed-by: Marek Behún <kabel@kernel.org> Cc: stable@vger.kernel.org # b1bd5714472c ("PCI: aardvark: Indicate error in 'val' when config read fails")
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.