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PCI: designware: Use pci_is_root_bus() to check if bus is root bus 

Use pci_is_root_bus() rather than tracking the root bus number to
determine if the bus is the root bus or not. This removes storing
duplicated data as well as the need for the host bridge driver to have
to care about the bus numbers in most cases.

Link: https://lore.kernel.org/r/20200722022514.1283916-6-robh@kernel.org
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Pengutronix Kernel Team <kernel@pengutronix.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
This commit is contained in:
Rob Herring 2020-07-21 20:25:00 -06:00 committed by Lorenzo Pieralisi
parent 11e9797360
commit 5525493866
4 changed files with 10 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/pci/controller/dwc/pci-imx6.c
View File

@ -1269,7 +1269,7 @@ static void imx6_pcie_quirk(struct pci_dev *dev)
if (bus->dev.parent->parent->driver != &imx6_pcie_driver.driver)
return;
if (bus->number == pp->root_bus_nr) {
if (pci_is_root_bus(bus)) {
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);

4
drivers/pci/controller/dwc/pci-keystone.c
View File

@ -440,7 +440,7 @@ static int ks_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
CFG_FUNC(PCI_FUNC(devfn));
if (bus->parent->number != pp->root_bus_nr)
if (!pci_is_root_bus(bus->parent))
reg |= CFG_TYPE1;
ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);
@ -457,7 +457,7 @@ static int ks_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) |
CFG_FUNC(PCI_FUNC(devfn));
if (bus->parent->number != pp->root_bus_nr)
if (!pci_is_root_bus(bus->parent))
reg |= CFG_TYPE1;
ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg);

16
drivers/pci/controller/dwc/pcie-designware-host.c
View File

@ -473,10 +473,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
goto err_free_msi;
}
pp->root_bus_nr = pp->busn->start;
bridge->sysdata = pp;
bridge->busnr = pp->root_bus_nr;
bridge->busnr = pp->busn->start;
bridge->ops = &dw_pcie_ops;
bridge->map_irq = of_irq_parse_and_map_pci;
bridge->swizzle_irq = pci_common_swizzle;
@ -528,7 +526,7 @@ static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus,
busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
PCIE_ATU_FUNC(PCI_FUNC(devfn));
if (bus->parent->number == pp->root_bus_nr) {
if (pci_is_root_bus(bus->parent)) {
type = PCIE_ATU_TYPE_CFG0;
cpu_addr = pp->cfg0_base;
cfg_size = pp->cfg0_size;
@ -584,13 +582,11 @@ static int dw_pcie_valid_device(struct pcie_port *pp, struct pci_bus *bus,
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
/* If there is no link, then there is no device */
if (bus->number != pp->root_bus_nr) {
if (!pci_is_root_bus(bus)) {
if (!dw_pcie_link_up(pci))
return 0;
}
} else if (dev > 0)
/* Access only one slot on each root port */
if (bus->number == pp->root_bus_nr && dev > 0)
return 0;
return 1;
@ -606,7 +602,7 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
return PCIBIOS_DEVICE_NOT_FOUND;
}
if (bus->number == pp->root_bus_nr)
if (pci_is_root_bus(bus))
return dw_pcie_rd_own_conf(pp, where, size, val);
return dw_pcie_rd_other_conf(pp, bus, devfn, where, size, val);
@ -620,7 +616,7 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
if (!dw_pcie_valid_device(pp, bus, PCI_SLOT(devfn)))
return PCIBIOS_DEVICE_NOT_FOUND;
if (bus->number == pp->root_bus_nr)
if (pci_is_root_bus(bus))
return dw_pcie_wr_own_conf(pp, where, size, val);
return dw_pcie_wr_other_conf(pp, bus, devfn, where, size, val);

1
drivers/pci/controller/dwc/pcie-designware.h
View File

@ -173,7 +173,6 @@ struct dw_pcie_host_ops {
};
struct pcie_port {
u8 root_bus_nr;
u64 cfg0_base;
void __iomem *va_cfg0_base;
u32 cfg0_size;