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From 4cc30de79d293f1e8c5f50ae3a9c005def9564a0 Mon Sep 17 00:00:00 2001
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From: Koen Vandeputte <koen.vandeputte@ncentric.com>
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Date: Mon, 7 Jan 2019 14:14:27 +0100
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Subject: [PATCH 2/2] arm: cns3xxx: use actual size reads for PCIe
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commit 802b7c06adc7 ("ARM: cns3xxx: Convert PCI to use generic config accessors")
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reimplemented cns3xxx_pci_read_config() using pci_generic_config_read32(),
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which preserved the property of only doing 32-bit reads.
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It also replaced cns3xxx_pci_write_config() with pci_generic_config_write(),
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so it changed writes from always being 32 bits to being the actual size,
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which works just fine.
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Due to:
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- The documentation does not mention that only 32 bit access is allowed.
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- Writes are already executed using the actual size
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- Extensive testing shows that 8b, 16b and 32b reads work as intended
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It makes perfectly sense to also swap 32 bit reading in favor of actual size.
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Fixes: 802b7c06adc7 ("ARM: cns3xxx: Convert PCI to use generic config accessors")
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Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
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Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
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CC: Arnd Bergmann <arnd@arndb.de>
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CC: Krzysztof Halasa <khalasa@piap.pl>
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CC: Olof Johansson <olof@lixom.net>
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CC: Robin Leblon <robin.leblon@ncentric.com>
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CC: Rob Herring <robh@kernel.org>
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CC: Russell King <linux@armlinux.org.uk>
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CC: Tim Harvey <tharvey@gateworks.com>
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CC: stable@vger.kernel.org # v4.0+
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---
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arch/arm/mach-cns3xxx/pcie.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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--- a/arch/arm/mach-cns3xxx/pcie.c
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+++ b/arch/arm/mach-cns3xxx/pcie.c
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@@ -93,7 +93,7 @@ static int cns3xxx_pci_read_config(struc
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u32 mask = (0x1ull << (size * 8)) - 1;
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int shift = (where % 4) * 8;
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- ret = pci_generic_config_read32(bus, devfn, where, size, val);
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+ ret = pci_generic_config_read(bus, devfn, where, size, val);
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if (ret == PCIBIOS_SUCCESSFUL && !bus->number && !devfn &&
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(where & 0xffc) == PCI_CLASS_REVISION)
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