mirror of https://github.com/hak5/openwrt.git
47 lines
1.9 KiB
Diff
47 lines
1.9 KiB
Diff
From 4cc30de79d293f1e8c5f50ae3a9c005def9564a0 Mon Sep 17 00:00:00 2001
|
|
From: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
|
Date: Mon, 7 Jan 2019 14:14:27 +0100
|
|
Subject: [PATCH 2/2] arm: cns3xxx: use actual size reads for PCIe
|
|
|
|
commit 802b7c06adc7 ("ARM: cns3xxx: Convert PCI to use generic config accessors")
|
|
reimplemented cns3xxx_pci_read_config() using pci_generic_config_read32(),
|
|
which preserved the property of only doing 32-bit reads.
|
|
|
|
It also replaced cns3xxx_pci_write_config() with pci_generic_config_write(),
|
|
so it changed writes from always being 32 bits to being the actual size,
|
|
which works just fine.
|
|
|
|
Due to:
|
|
- The documentation does not mention that only 32 bit access is allowed.
|
|
- Writes are already executed using the actual size
|
|
- Extensive testing shows that 8b, 16b and 32b reads work as intended
|
|
|
|
It makes perfectly sense to also swap 32 bit reading in favor of actual size.
|
|
|
|
Fixes: 802b7c06adc7 ("ARM: cns3xxx: Convert PCI to use generic config accessors")
|
|
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
|
|
Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
|
|
CC: Arnd Bergmann <arnd@arndb.de>
|
|
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(-)
|
|
|
|
--- a/arch/arm/mach-cns3xxx/pcie.c
|
|
+++ b/arch/arm/mach-cns3xxx/pcie.c
|
|
@@ -93,7 +93,7 @@ static int cns3xxx_pci_read_config(struc
|
|
u32 mask = (0x1ull << (size * 8)) - 1;
|
|
int shift = (where % 4) * 8;
|
|
|
|
- ret = pci_generic_config_read32(bus, devfn, where, size, val);
|
|
+ ret = pci_generic_config_read(bus, devfn, where, size, val);
|
|
|
|
if (ret == PCIBIOS_SUCCESSFUL && !bus->number && !devfn &&
|
|
(where & 0xffc) == PCI_CLASS_REVISION)
|