3.6.11.6 stable review patch. If anyone has any objections, please let me know. ------------------ From: Kleber Sacilotto de Souza [ Upstream commit d82fb31abc46620b7c22758c75707069f2763646 ] On pseries machines the detection for max_bus_speed should be done through an OpenFirmware property. This patch adds a function to perform this detection and a hook to perform dynamic adding of the function only for pseries. This is done by overwriting the weak pcibios_root_bridge_prepare function which is called by pci_create_root_bus(). From: Lucas Kannebley Tavares Signed-off-by: Kleber Sacilotto de Souza Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Steven Rostedt --- arch/powerpc/include/asm/machdep.h | 3 ++ arch/powerpc/kernel/pci-common.c | 8 +++++ arch/powerpc/platforms/pseries/pci.c | 53 ++++++++++++++++++++++++++++++ arch/powerpc/platforms/pseries/pseries.h | 4 +++ arch/powerpc/platforms/pseries/setup.c | 3 ++ 5 files changed, 71 insertions(+) diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h index 42ce570..fd23013 100644 --- a/arch/powerpc/include/asm/machdep.h +++ b/arch/powerpc/include/asm/machdep.h @@ -29,6 +29,7 @@ struct rtc_time; struct file; struct pci_controller; struct kimage; +struct pci_host_bridge; struct machdep_calls { char *name; @@ -107,6 +108,8 @@ struct machdep_calls { void (*pcibios_fixup)(void); int (*pci_probe_mode)(struct pci_bus *); void (*pci_irq_fixup)(struct pci_dev *dev); + int (*pcibios_root_bridge_prepare)(struct pci_host_bridge + *bridge); /* To setup PHBs when using automatic OF platform driver for PCI */ int (*pci_setup_phb)(struct pci_controller *host); diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c index 51ecf87..6fe4341 100644 --- a/arch/powerpc/kernel/pci-common.c +++ b/arch/powerpc/kernel/pci-common.c @@ -826,6 +826,14 @@ int pci_proc_domain(struct pci_bus *bus) return 1; } +int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + if (ppc_md.pcibios_root_bridge_prepare) + return ppc_md.pcibios_root_bridge_prepare(bridge); + + return 0; +} + /* This header fixup will do the resource fixup for all devices as they are * probed, but not for bridge ranges */ diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c index 2c6ded2..7f6f556 100644 --- a/arch/powerpc/platforms/pseries/pci.c +++ b/arch/powerpc/platforms/pseries/pci.c @@ -107,3 +107,56 @@ static void fixup_winbond_82c105(struct pci_dev* dev) } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105, fixup_winbond_82c105); + +int pseries_root_bridge_prepare(struct pci_host_bridge *bridge) +{ + struct device_node *dn, *pdn; + struct pci_bus *bus; + const uint32_t *pcie_link_speed_stats; + + bus = bridge->bus; + + dn = pcibios_get_phb_of_node(bus); + if (!dn) + return 0; + + for (pdn = dn; pdn != NULL; pdn = of_get_next_parent(pdn)) { + pcie_link_speed_stats = (const uint32_t *) of_get_property(pdn, + "ibm,pcie-link-speed-stats", NULL); + if (pcie_link_speed_stats) + break; + } + + of_node_put(pdn); + + if (!pcie_link_speed_stats) { + pr_err("no ibm,pcie-link-speed-stats property\n"); + return 0; + } + + switch (pcie_link_speed_stats[0]) { + case 0x01: + bus->max_bus_speed = PCIE_SPEED_2_5GT; + break; + case 0x02: + bus->max_bus_speed = PCIE_SPEED_5_0GT; + break; + default: + bus->max_bus_speed = PCI_SPEED_UNKNOWN; + break; + } + + switch (pcie_link_speed_stats[1]) { + case 0x01: + bus->cur_bus_speed = PCIE_SPEED_2_5GT; + break; + case 0x02: + bus->cur_bus_speed = PCIE_SPEED_5_0GT; + break; + default: + bus->cur_bus_speed = PCI_SPEED_UNKNOWN; + break; + } + + return 0; +} diff --git a/arch/powerpc/platforms/pseries/pseries.h b/arch/powerpc/platforms/pseries/pseries.h index 9a3dda0..b79393d 100644 --- a/arch/powerpc/platforms/pseries/pseries.h +++ b/arch/powerpc/platforms/pseries/pseries.h @@ -60,4 +60,8 @@ extern int dlpar_detach_node(struct device_node *); /* Snooze Delay, pseries_idle */ DECLARE_PER_CPU(long, smt_snooze_delay); +/* PCI root bridge prepare function override for pseries */ +struct pci_host_bridge; +int pseries_root_bridge_prepare(struct pci_host_bridge *bridge); + #endif /* _PSERIES_PSERIES_H */ diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c index 51ecac9..5f01342 100644 --- a/arch/powerpc/platforms/pseries/setup.c +++ b/arch/powerpc/platforms/pseries/setup.c @@ -404,6 +404,9 @@ static void __init pSeries_setup_arch(void) ppc_md.enable_pmcs = pseries_lpar_enable_pmcs; else ppc_md.enable_pmcs = power4_enable_pmcs; + + ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare; + } static int __init pSeries_init_panel(void) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/