On Thu, Oct 22, 2020 at 05:00:38PM -0500, Rob Herring wrote:
> With commit 669cbc708122 ("PCI: Move DT resource setup into
> devm_pci_alloc_host_bridge()"), the DT 'ranges' is parsed and populated
> into resources when the host bridge is allocated. The resources are
> requested as well, but that happens a 2nd time for the mvebu driver in
> mvebu_pcie_parse_request_resources(). We should only be requesting the
> additional resources added in mvebu_pcie_parse_request_resources().
> These are not added by default because the use custom properties rather
> than standard DT address translation.
>
> Also, the bus ranges was also populated by default, so we can remove
> it from mvebu_pci_host_probe().
Still doesn't work.
mvebu-pcie soc:pcie: resource collision: [io 0x1000-0xeffff] conflicts with System RAM [mem 0x00000000-0x3fffffff]
mvebu-pcie: probe of soc:pcie failed with error -16
>
> Fixes: 669cbc708122 ("PCI: Move DT resource setup into devm_pci_alloc_host_bridge()")
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=209729
> Reported-by: vtolkm@xxxxxxxxxxxxxx
> Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxx>
> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: Russell King <linux@xxxxxxxxxxxxxxx>
> Cc: linux-pci@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
> ---
> Untested, please test.
>
> drivers/pci/controller/pci-mvebu.c | 23 ++++++++++-------------
> 1 file changed, 10 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index c39978b750ec..c6fc8bd5e77f 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -960,25 +960,16 @@ static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port)
> }
>
> /*
> - * We can't use devm_of_pci_get_host_bridge_resources() because we
> - * need to parse our special DT properties encoding the MEM and IO
> - * apertures.
> + * devm_of_pci_get_host_bridge_resources() only sets up translateable resources,
> + * so we need extra resource setup parsing our special DT properties encoding
> + * the MEM and IO apertures.
> */
> static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
> {
> struct device *dev = &pcie->pdev->dev;
> - struct device_node *np = dev->of_node;
> struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
> int ret;
>
> - /* Get the bus range */
> - ret = of_pci_parse_bus_range(np, &pcie->busn);
> - if (ret) {
> - dev_err(dev, "failed to parse bus-range property: %d\n", ret);
> - return ret;
> - }
> - pci_add_resource(&bridge->windows, &pcie->busn);
> -
> /* Get the PCIe memory aperture */
> mvebu_mbus_get_pcie_mem_aperture(&pcie->mem);
> if (resource_size(&pcie->mem) == 0) {
> @@ -988,6 +979,9 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
>
> pcie->mem.name = "PCI MEM";
> pci_add_resource(&bridge->windows, &pcie->mem);
> + ret = devm_request_resource(dev, &iomem_resource, &pcie->mem);
> + if (ret)
> + return ret;
>
> /* Get the PCIe IO aperture */
> mvebu_mbus_get_pcie_io_aperture(&pcie->io);
> @@ -1001,9 +995,12 @@ static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie)
> pcie->realio.name = "PCI I/O";
>
> pci_add_resource(&bridge->windows, &pcie->realio);
> + ret = devm_request_resource(dev, &iomem_resource, &pcie->realio);
I think you're trying to claim this resource against the wrong parent.
> + if (ret)
> + return ret;
> }
>
> - return devm_request_pci_bus_resources(dev, &bridge->windows);
> + return 0;
> }
>
> /*
> --
> 2.25.1
>
>
--
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