From d11d9ef1579ed7ee58b28828a67b7e174c571fb3 Mon Sep 17 00:00:00 2001 From: Bin Meng Date: Sun, 19 Jul 2015 00:20:06 +0800 Subject: dm: pci: Support bridge device configuration correctly Commit aec241d "dm: pci: Use the correct hose when configuring devices" was an attempt to fix pci bridge device configuration, but unfortunately that does not work 100%. In pciauto_config_devices(), the fix tried to call pciauto_config_device() with a ctlr_hose which is supposed to be the root controller hose, however when walking through a pci topology with 2 or more pci bridges this logic simply fails. The call chain is: pciauto_config_devices()->pciauto_config_device() ->dm_pci_hose_probe_bus(). Here the call to dm_pci_hose_probe_bus() does not make any sense as the given hose is not the bridge device's hose, instead it is either the root controller's hose (case#1: if it is the 2nd pci bridge), or the bridge's parent bridge's hose (case#2: if it is the 3rd pci bridge). In both cases the logic is wrong. For example, for failing case#1 if the bridge device to config has the same devfn as one of the devices under the root controller, the call to pci_bus_find_devfn() will return the udevice of that pci device under the root controller as the bus, but this is wrong as the udevice is not a bus which does not contain all the necessary bits associated with the udevice which causes further failures. To correctly support pci bridge device configuration, we should still call pciauto_config_device() with the pci bridge's hose directly. In order to access valid pci region information, we need to refer to the root controller simply by a call to pci_bus_to_hose(0) and get the region information there in the pciauto_prescan_setup_bridge(), pciauto_postscan_setup_bridge() and pciauto_config_device(). Signed-off-by: Bin Meng --- drivers/pci/pci_common.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'drivers/pci/pci_common.c') diff --git a/drivers/pci/pci_common.c b/drivers/pci/pci_common.c index f67c9c7b2f..07f1726748 100644 --- a/drivers/pci/pci_common.c +++ b/drivers/pci/pci_common.c @@ -224,7 +224,7 @@ phys_addr_t pci_hose_bus_to_phys(struct pci_controller *hose, #ifdef CONFIG_DM_PCI /* The root controller has the region information */ - hose = hose->ctlr->uclass_priv; + hose = pci_bus_to_hose(0); #endif /* @@ -289,6 +289,11 @@ pci_addr_t pci_hose_phys_to_bus(struct pci_controller *hose, return bus_addr; } +#ifdef CONFIG_DM_PCI + /* The root controller has the region information */ + hose = pci_bus_to_hose(0); +#endif + /* * if PCI_REGION_MEM is set we do a two pass search with preference * on matches that don't have PCI_REGION_SYS_MEMORY set -- cgit