Re: [PATCH] PCI Update for 2.6.2-rc2

[Greg KH <greg@kroah.com>]

ChangeSet 1.1519, 2004/01/29 15:38:38-08:00, ralf@linux-mips.org

[PATCH] PCI: fix probing for some mips systems


 drivers/pci/probe.c |    9 +++++++++
 1 files changed, 9 insertions(+)


diff -Nru a/drivers/pci/probe.c b/drivers/pci/probe.c
--- a/drivers/pci/probe.c	Thu Jan 29 17:24:05 2004
+++ b/drivers/pci/probe.c	Thu Jan 29 17:24:05 2004
@@ -337,12 +337,19 @@
 	struct pci_bus *child;
 	int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
 	u32 buses;
+	u16 bctl;
 
 	pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
 
 	DBG("Scanning behind PCI bridge %s, config %06x, pass %d\n",
 	    pci_name(dev), buses & 0xffffff, pass);
 
+	/* Disable MasterAbortMode during probing to avoid reporting
+	   of bus errors (in some architectures) */ 
+	pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
+	pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
+			      bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
+
 	if ((buses & 0xffff00) && !pcibios_assign_all_busses() && !is_cardbus) {
 		unsigned int cmax, busnr;
 		/*
@@ -405,6 +412,8 @@
 		child->subordinate = max;
 		pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
 	}
+
+	pci_write_config_word(dev, PCI_BRIDGE_CONTROL, bctl);
 
 	sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);