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771153fc88
From very vague, ambiguous and incomplete information from Marvell we deduced that the 32-bit Aardvark register at address 0x4 (PCIE_CORE_CMD_STATUS_REG), which is not documented for Root Complex mode in the Functional Specification (only for Endpoint mode), controls two 16-bit PCIe registers: Command Register and Status Registers of PCIe Root Port. This means that bit 2 controls bus mastering and forwarding of memory and I/O requests in the upstream direction. According to PCI specifications bits [0:2] of Command Register, this should be by default disabled on reset. So explicitly disable these bits at early setup of the Aardvark driver. Remove code which unconditionally enables all 3 bits and let kernel code (via pci_set_master() function) to handle bus mastering of Root PCIe Bridge via emulated PCI_COMMAND on emulated bridge. Link: https://lore.kernel.org/r/20211028185659.20329-5-kabel@kernel.org Fixes: |
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.. | ||
cadence | ||
dwc | ||
mobiveil | ||
Kconfig | ||
Makefile | ||
pci-aardvark.c | ||
pci-ftpci100.c | ||
pci-host-common.c | ||
pci-host-generic.c | ||
pci-hyperv-intf.c | ||
pci-hyperv.c | ||
pci-ixp4xx.c | ||
pci-loongson.c | ||
pci-mvebu.c | ||
pci-rcar-gen2.c | ||
pci-tegra.c | ||
pci-thunder-ecam.c | ||
pci-thunder-pem.c | ||
pci-v3-semi.c | ||
pci-versatile.c | ||
pci-xgene-msi.c | ||
pci-xgene.c | ||
pcie-altera-msi.c | ||
pcie-altera.c | ||
pcie-brcmstb.c | ||
pcie-hisi-error.c | ||
pcie-iproc-bcma.c | ||
pcie-iproc-msi.c | ||
pcie-iproc-platform.c | ||
pcie-iproc.c | ||
pcie-iproc.h | ||
pcie-mediatek-gen3.c | ||
pcie-mediatek.c | ||
pcie-microchip-host.c | ||
pcie-rcar-ep.c | ||
pcie-rcar-host.c | ||
pcie-rcar.c | ||
pcie-rcar.h | ||
pcie-rockchip-ep.c | ||
pcie-rockchip-host.c | ||
pcie-rockchip.c | ||
pcie-rockchip.h | ||
pcie-xilinx-cpm.c | ||
pcie-xilinx-nwl.c | ||
pcie-xilinx.c | ||
vmd.c |