On Thu, Aug 31, 2017 at 11:58:17AM -0500, Bjorn Helgaas wrote: > [+cc Kishon, Thomas, Niklas, Jesper, Zhou, Gabriele, Xiaowei, Binghui, > Stanimir, Pratyush, Kukjin, Krzysztof, Richard, Murali, Minghuan, Mingkai, > Roy] > > Sorry about the unwieldy cc list. It seems like this affects every > DesignWare-based driver. > > On Mon, Aug 28, 2017 at 04:23:05PM +0200, Lucas Stach wrote: > > The MSI part of the controller isn't essential, so the host controller can > > be registered without the MSI controller being present. This allows the > > host to work in PCIe legancy interrupt only mode, if the IRQ line for the > > s/legancy/legacy/ > > > MSI controller is missing. > > > > Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx> > > --- > > drivers/pci/dwc/pcie-designware-host.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/pci/dwc/pcie-designware-host.c b/drivers/pci/dwc/pcie-designware-host.c > > index d29c020da082..8494089f088d 100644 > > --- a/drivers/pci/dwc/pcie-designware-host.c > > +++ b/drivers/pci/dwc/pcie-designware-host.c > > @@ -381,7 +381,7 @@ int dw_pcie_host_init(struct pcie_port *pp) > > if (ret) > > pci->num_viewport = 2; > > > > - if (IS_ENABLED(CONFIG_PCI_MSI)) { > > + if (IS_ENABLED(CONFIG_PCI_MSI) && pp->msi_irq > 0) { > > if (!pp->ops->msi_host_init) { > > pp->irq_domain = irq_domain_add_linear(dev->of_node, > > MAX_MSI_IRQS, &msi_domain_ops, > > @@ -412,7 +412,7 @@ int dw_pcie_host_init(struct pcie_port *pp) > > bridge->ops = &dw_pcie_ops; > > bridge->map_irq = of_irq_parse_and_map_pci; > > bridge->swizzle_irq = pci_common_swizzle; > > - if (IS_ENABLED(CONFIG_PCI_MSI)) { > > + if (IS_ENABLED(CONFIG_PCI_MSI) && pp->msi_irq > 0) { > > bridge->msi = &dw_pcie_msi_chip; > > dw_pcie_msi_chip.dev = dev; > > } > > Here are the callers of dw_pcie_host_init(): > > armada8k_add_pcie_port > artpec6_add_pcie_port # sets pp->msi_irq > dra7xx_add_pcie_port > dw_plat_add_pcie_port # sets pp->msi_irq > exynos_add_pcie_port # sets pp->msi_irq > hisi_add_pcie_port > imx6_add_pcie_port # sets pp->msi_irq > kirin_add_pcie_port > ks_dw_pcie_host_init # sets pp->ops->msi_host_init > ls_add_pcie_port # sets pp->ops->msi_host_init > qcom_pcie_probe # sets pp->msi_irq > spear13xx_add_pcie_port > > For the drivers that set pp->msi_irq (artpec6, dw_plat, exynos, imx6, > qcom), it seems like you'd want a similar follow-up change for all of > them to make the MSI IRQ optional, but you only changed imx6. What > about the others? > > For the drivers that don't set pp->msi_irq and don't set > pp->ops->msi_host_init (armada8k, dra7xx, hisi, kirin, spear13xx), > this patch means they no longer set up pp->irq_domain. Do you intend > that? Ping, I'm looking for a v2 that addresses this. No hurry, just making sure you're not waiting on me. Bjorn