Subject: [PATCH v2] powerpc/fsl/pci: Fix PCIe fixup regression

From: Benjamin Herrenschmidt <[email-masked]>
Date: Thu, 16 Feb 2012 16:37:58 +1100

Upstream changes to the way PHB resources are registered
broke the resource fixup for FSL boards.

We can no longer rely on the resource pointer array for the PHB's
pci_bus structure, so let's leave it alone and go straight for
the PHB resources instead. This also makes the code generally
more readable.

Signed-off-by: Benjamin Herrenschmidt <[email-masked]>
---

v2: Properly clear resources above what's in the PHB

With this, I got a radeon and a e1000 working with upstream.

Let's my other patch (the one changing the header quirk) for now
as it seems to be breaking DMA, I'll investigate.

Kumar, can I have an ack for this ?

 arch/powerpc/sysdev/fsl_pci.c |   48 ++++++++++++++++++++++++----------------
 1 files changed, 29 insertions(+), 19 deletions(-)

diff --git a/arch/powerpc/sysdev/fsl_pci.c b/arch/powerpc/sysdev/fsl_pci.c
index 30eb17e..6073288 100644
--- a/arch/powerpc/sysdev/fsl_pci.c
+++ b/arch/powerpc/sysdev/fsl_pci.c
@@ -385,26 +385,36 @@ static void __init setup_pci_cmd(struct pci_controller *hose)
 void fsl_pcibios_fixup_bus(struct pci_bus *bus)
 {
 	struct pci_controller *hose = pci_bus_to_host(bus);
-	int i;
-
-	if ((bus->parent == hose->bus) &&
-	    ((fsl_pcie_bus_fixup &&
-	      early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) ||
-	     (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK)))
-	{
-		for (i = 0; i < 4; ++i) {
+	int i, is_pcie = 0, no_link;
+
+	/* The root complex bridge comes up with bogus resources,
+	 * we copy the PHB ones in.
+	 *
+	 * With the current generic PCI code, the PHB bus no longer
+	 * has bus->resource[0..4] set, so things are a bit more
+	 * tricky.
+	 */
+
+	if (fsl_pcie_bus_fixup)
+		is_pcie = early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP);
+	no_link = !!(hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK);
+
+	if (bus->parent == hose->bus && (is_pcie || no_link)) {
+		for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; ++i) {
 			struct resource *res = bus->resource[i];
-			struct resource *par = bus->parent->resource[i];
-			if (res) {
-				res->start = 0;
-				res->end   = 0;
-				res->flags = 0;
-			}
-			if (res && par) {
-				res->start = par->start;
-				res->end   = par->end;
-				res->flags = par->flags;
-			}
+			struct resource *par;
+
+			if (!res)
+				continue;
+			if (i == 0)
+				par = &hose->io_resource;
+			else if (i < 4)
+				par = &hose->mem_resources[i-1];
+			else par = NULL;
+
+			res->start = par ? par->start : 0;
+			res->end   = par ? par->end   : 0;
+			res->flags = par ? par->flags : 0;
 		}
 	}
 }
-- 
1.7.9