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65dbb423cf
linux_dsm_epyc7002/arch/arm/mach-cns3xxx
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Koen Vandeputte 65dbb423cf ARM: cns3xxx: Fix writing to wrong PCI config registers after alignment 
Originally, cns3xxx used its own functions for mapping, reading and
writing config registers.

Commit 802b7c06ad ("ARM: cns3xxx: Convert PCI to use generic config
accessors") removed the internal PCI config write function in favor of
the generic one:

  cns3xxx_pci_write_config() --> pci_generic_config_write()

cns3xxx_pci_write_config() expected aligned addresses, being produced by
cns3xxx_pci_map_bus() while the generic one pci_generic_config_write()
actually expects the real address as both the function and hardware are
capable of byte-aligned writes.

This currently leads to pci_generic_config_write() writing to the wrong
registers.

For instance, upon ath9k module loading:

- driver ath9k gets loaded
- The driver wants to write value 0xA8 to register PCI_LATENCY_TIMER,
  located at 0x0D
- cns3xxx_pci_map_bus() aligns the address to 0x0C
- pci_generic_config_write() effectively writes 0xA8 into register 0x0C
  (CACHE_LINE_SIZE)

Fix the bug by removing the alignment in the cns3xxx mapping function.

Fixes: 802b7c06ad ("ARM: cns3xxx: Convert PCI to use generic config accessors")
Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Krzysztof Halasa <khalasa@piap.pl>
Acked-by: Tim Harvey <tharvey@gateworks.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
CC: stable@vger.kernel.org	# v4.0+
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Olof Johansson <olof@lixom.net>
CC: Robin Leblon <robin.leblon@ncentric.com>
CC: Rob Herring <robh@kernel.org>
CC: Russell King <linux@armlinux.org.uk>
2019-01-31 15:01:44 -06:00
..
cns3xxx.h CNS3xxx: remove unused *_VIRT definitions 2016-03-02 20:09:15 +01:00
cns3420vb.c ARM: cns3xxx: fix allmodconfig panic in pci driver 2014-09-04 23:39:57 +02:00
core.c ARM: remove duplicate 'const' annotations' 2017-05-19 10:12:55 +02:00
core.h ARM: cns3xxx: fix allmodconfig panic in pci driver 2014-09-04 23:39:57 +02:00
devices.c ARM: cns3xxx: make mach header files local 2013-03-14 17:34:55 +01:00
devices.h ARM: cns3xxx: Add support for AHCI controllers 2010-06-08 17:37:09 +04:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pcie.c ARM: cns3xxx: Fix writing to wrong PCI config registers after alignment 2019-01-31 15:01:44 -06:00
pm.c ARM: cns3xxx: don't export static symbol 2015-03-13 11:02:15 +01:00
pm.h ARM: cns3xxx: make mach header files local 2013-03-14 17:34:55 +01:00