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e21c6587b0
commit fcb461e2bc8b83b7eaca20cb2221e8b940f2189c upstream. 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") Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>