diff options
Diffstat (limited to 'target/linux/imx6/patches-3.14/200-PCI-imx6-add-support-for-legacy-irqs.patch')
| -rw-r--r-- | target/linux/imx6/patches-3.14/200-PCI-imx6-add-support-for-legacy-irqs.patch | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/target/linux/imx6/patches-3.14/200-PCI-imx6-add-support-for-legacy-irqs.patch b/target/linux/imx6/patches-3.14/200-PCI-imx6-add-support-for-legacy-irqs.patch new file mode 100644 index 0000000000..a175b1eb7c --- /dev/null +++ b/target/linux/imx6/patches-3.14/200-PCI-imx6-add-support-for-legacy-irqs.patch @@ -0,0 +1,43 @@ +From: Tim Harvey <tharvey@gateworks.com> +Subject: [PATCH] PCI: imx6: add support for legacy irqs + +The i.MX6 supports legacy IRQ's via 155,154,153,152. When devices +are behind a PCIe-to-PCIe switch (at least for the TI XIO2001) the +mapping is reversed from when they are behind a PCIe switch. + +This patch still needs some review and clarification before going +upstream. +--- + drivers/pci/host/pcie-designware.c | 21 ++++++++++++++++++++- + 1 file changed, 20 insertions(+), 1 deletion(-) + +--- a/drivers/pci/host/pcie-designware.c ++++ b/drivers/pci/host/pcie-designware.c +@@ -739,7 +739,26 @@ static int dw_pcie_map_irq(const struct + { + struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata); + +- return pp->irq; ++ /* TI XIO2001 PCIe-to-PCI bridge IRQs are flipped it seems */ ++ if ( dev->bus && dev->bus->self ++ && (dev->bus->self->vendor == 0x104c) ++ && (dev->bus->self->device == 0x8240)) { ++ switch (pin) { ++ case 1: return pp->irq - 3; ++ case 2: return pp->irq - 2; ++ case 3: return pp->irq - 1; ++ case 4: return pp->irq; ++ default: return -1; ++ } ++ } else { ++ switch (pin) { ++ case 1: return pp->irq; ++ case 2: return pp->irq - 1; ++ case 3: return pp->irq - 2; ++ case 4: return pp->irq - 3; ++ default: return -1; ++ } ++ } + } + + static void dw_pcie_add_bus(struct pci_bus *bus) |