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3afc8299f3
linux/drivers/pci/controller
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Lucas Stach 3afc8299f3 PCI: dwc: skip MSI init if MSIs have been explicitly disabled 
Since 7c5925afbc (PCI: dwc: Move MSI IRQs allocation to IRQ domains
hierarchical API) the MSI init claims one of the controller IRQs as a
chained IRQ line for the MSI controller. On some designs, like the i.MX6,
this line is shared with a PCIe legacy IRQ. When the line is claimed for
the MSI domain, any device trying to use this legacy IRQs will fail to
request this IRQ line.

As MSI and legacy IRQs are already mutually exclusive on the DWC core,
as the core won't forward any legacy IRQs once any MSI has been enabled,
users wishing to use legacy IRQs already need to explictly disable MSI
support (usually via the pci=nomsi kernel commandline option). To avoid
any issues with MSI conflicting with legacy IRQs, just skip all of the
DWC MSI initalization, including the IRQ line claim, when MSI is disabled.

Fixes: 7c5925afbc ("PCI: dwc: Move MSI IRQs allocation to IRQ domains hierarchical API")
Tested-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: stable@vger.kernel.org
2019-03-01 12:05:45 +00:00
..
dwc PCI: dwc: skip MSI init if MSIs have been explicitly disabled 2019-03-01 12:05:45 +00:00
Kconfig Merge branch 'remotes/lorenzo/pci/mediatek' 2018-10-20 11:45:53 -05:00
Makefile PCI: mobiveil: Add Kconfig/Makefile entries 2018-07-30 14:30:16 +01:00
pci-aardvark.c PCI: aardvark: Implement emulated root PCI bridge config space 2018-10-18 17:51:41 +01:00
pci-ftpci100.c PCI: faraday: Fix I/O space page leak 2018-07-18 17:01:14 -05:00
pci-host-common.c PCI: Remove unnecessary check of device_type == pci 2018-09-25 09:40:03 +01:00
pci-host-generic.c
pci-hyperv.c PCI: hv: Fix return value check in hv_pci_assign_slots() 2018-09-21 19:13:22 -07:00
pci-mvebu.c pci-v4.20-changes 2018-10-25 06:50:48 -07:00
pci-rcar-gen2.c
pci-tegra.c
pci-thunder-ecam.c
pci-thunder-pem.c
pci-v3-semi.c PCI: v3-semi: Fix I/O space page leak 2018-07-18 17:02:13 -05:00
pci-versatile.c PCI: versatile: Fix I/O space page leak 2018-07-18 17:00:11 -05:00
pci-xgene-msi.c
pci-xgene.c PCI: xgene: Fix I/O space page leak 2018-07-18 16:59:40 -05:00
pcie-altera-msi.c
pcie-altera.c
pcie-cadence-ep.c PCI: cadence: Write MSI data with 32bits 2018-10-12 12:09:29 +01:00
pcie-cadence-host.c PCI: Remove unnecessary check of device_type == pci 2018-09-25 09:40:03 +01:00
pcie-cadence.c pci-v4.20-changes 2018-10-25 06:50:48 -07:00
pcie-cadence.h PCI: cadence: Add Power Management ops for host and EP 2018-07-12 12:44:14 +01:00
pcie-iproc-bcma.c
pcie-iproc-msi.c
pcie-iproc-platform.c
pcie-iproc.c PCI: iproc: Remove PAXC slot check to allow VF support 2018-09-18 10:13:04 +01:00
pcie-iproc.h PCI: iproc: Reject unconfigured physical functions from PAXC 2018-07-13 11:56:55 +01:00
pcie-mediatek.c PCI: mediatek: Remove un-used variant in struct mtk_pcie_port 2018-12-18 13:48:07 +00:00
pcie-mobiveil.c PCI: Remove unnecessary check of device_type == pci 2018-09-25 09:40:03 +01:00
pcie-rcar.c PCI: rcar: Clean up PHY init on failure 2018-06-29 13:48:54 -05:00
pcie-rockchip-ep.c PCI: Update xxx_pcie_ep_raise_irq() and pci_epc_raise_irq() signatures 2018-07-19 11:34:42 +01:00
pcie-rockchip-host.c
pcie-rockchip.c
pcie-rockchip.h
pcie-tango.c
pcie-xilinx-nwl.c PCI: Remove unnecessary check of device_type == pci 2018-09-25 09:40:03 +01:00
pcie-xilinx.c PCI: Remove unnecessary check of device_type == pci 2018-09-25 09:40:03 +01:00
vmd.c vmd: use the proper dma_* APIs instead of direct methods calls 2018-12-13 21:06:17 +01:00