diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/100-arm-cns3xxx-fix-writing-to-wrong-PCI-registers-after.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/100-arm-cns3xxx-fix-writing-to-wrong-PCI-registers-after.patch | 79 |
1 files changed, 0 insertions, 79 deletions
diff --git a/target/linux/generic/patches-4.4/100-arm-cns3xxx-fix-writing-to-wrong-PCI-registers-after.patch b/target/linux/generic/patches-4.4/100-arm-cns3xxx-fix-writing-to-wrong-PCI-registers-after.patch deleted file mode 100644 index 458515a0b5..0000000000 --- a/target/linux/generic/patches-4.4/100-arm-cns3xxx-fix-writing-to-wrong-PCI-registers-after.patch +++ /dev/null @@ -1,79 +0,0 @@ -From 03556dab1cb02d85b50d7be3ee3a3bac001f5991 Mon Sep 17 00:00:00 2001 -From: Koen Vandeputte <koen.vandeputte@ncentric.com> -Date: Tue, 18 Dec 2018 12:14:06 +0100 -Subject: [PATCH] arm: cns3xxx: fix writing to wrong PCI registers after - alignment - -Originally, cns3xxx used it's own functions for mapping, reading and writing registers. - -Commit 802b7c06adc7 ("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 on some ocasions. - -First issue seen due to this: - -- 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) - -This seems to cause some slight instability when certain PCI devices are used. - -Another issue example caused by this this is the PCI bus numbering, -where the primary bus is higher than the secondary, which is impossible. - -Before: - -00:00.0 PCI bridge: Cavium, Inc. Device 3400 (rev 01) (prog-if 00 [Normal decode]) - Flags: bus master, fast devsel, latency 0, IRQ 255 - Bus: primary=02, secondary=01, subordinate=ff, sec-latency=0 - -After fix: - -00:00.0 PCI bridge: Cavium, Inc. Device 3400 (rev 01) (prog-if 00 [Normal decode]) - Flags: bus master, fast devsel, latency 0, IRQ 255 - Bus: primary=00, secondary=01, subordinate=02, sec-latency=0 - -And very likely some more .. - -Fix all by omitting the alignment being done in the mapping function. - -Fixes: 802b7c06adc7 ("ARM: cns3xxx: Convert PCI to use generic config accessors") -Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com> -CC: Arnd Bergmann <arnd@arndb.de> -CC: Bjorn Helgaas <bhelgaas@google.com> -CC: Krzysztof Halasa <khalasa@piap.pl> -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> -CC: Tim Harvey <tharvey@gateworks.com> -CC: stable@vger.kernel.org # v4.0+ ---- - arch/arm/mach-cns3xxx/pcie.c | 2 +- - 1 file changed, 1 insertion(+), 1 deletion(-) - -diff --git a/arch/arm/mach-cns3xxx/pcie.c b/arch/arm/mach-cns3xxx/pcie.c -index 318394ed5c7a..5e11ad3164e0 100644 ---- a/arch/arm/mach-cns3xxx/pcie.c -+++ b/arch/arm/mach-cns3xxx/pcie.c -@@ -83,7 +83,7 @@ static void __iomem *cns3xxx_pci_map_bus(struct pci_bus *bus, - } else /* remote PCI bus */ - base = cnspci->cfg1_regs + ((busno & 0xf) << 20); - -- return base + (where & 0xffc) + (devfn << 12); -+ return base + where + (devfn << 12); - } - - static int cns3xxx_pci_read_config(struct pci_bus *bus, unsigned int devfn, --- -2.17.1 - |