---

yaml
---
r: 101679
b: refs/heads/master
c: 5ce4b59
h: refs/heads/master
i:
  101677: 70e5502
  101675: deae830
  101671: 00ac879
  101663: 5db0e9a
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d2146cb274e494dd14e50f5b4cdeb7a5e5af5421
+refs/heads/master: 5ce4b59653b2c2053cd9a011918ac1e4747f24cc

trunk/arch/powerpc/sysdev/indirect_pci.c

@@ -123,6 +123,12 @@ indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
 			(bus->number == hose->first_busno))
 		val &= 0xffffff00;
 
+	/* Workaround for PCI_28 Errata in 440EPx/GRx */
+	if ((hose->indirect_type & PPC_INDIRECT_TYPE_BROKEN_MRM) &&
+			offset == PCI_CACHE_LINE_SIZE) {
+		val = 0;
+	}
+
 	/*
 	 * Note: the caller has already checked that offset is
 	 * suitably aligned and that len is 1, 2 or 4.

trunk/arch/powerpc/sysdev/ppc4xx_pci.c

@@ -75,6 +75,11 @@ static void fixup_ppc4xx_pci_bridge(struct pci_dev *dev)
 	    !of_device_is_compatible(hose->dn, "ibm,plb-pci"))
 		return;
 
+	if (of_device_is_compatible(hose->dn, "ibm,plb440epx-pci") ||
+		of_device_is_compatible(hose->dn, "ibm,plb440grx-pci")) {
+		hose->indirect_type |= PPC_INDIRECT_TYPE_BROKEN_MRM;
+	}
+
 	/* Hide the PCI host BARs from the kernel as their content doesn't
 	 * fit well in the resource management
 	 */

trunk/include/asm-powerpc/pci-bridge.h

@@ -92,12 +92,15 @@ struct pci_controller {
 	 *   anything but the PHB.  Only allow talking to the PHB if this is
 	 *   set.
 	 *  BIG_ENDIAN - cfg_addr is a big endian register
+	 *  BROKEN_MRM - the 440EPx/GRx chips have an errata that causes hangs on
+	 *   the PLB4.  Effectively disable MRM commands by setting this.
 	 */
 #define PPC_INDIRECT_TYPE_SET_CFG_TYPE		0x00000001
 #define PPC_INDIRECT_TYPE_EXT_REG		0x00000002
 #define PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS	0x00000004
 #define PPC_INDIRECT_TYPE_NO_PCIE_LINK		0x00000008
 #define PPC_INDIRECT_TYPE_BIG_ENDIAN		0x00000010
+#define PPC_INDIRECT_TYPE_BROKEN_MRM		0x00000020
 	u32 indirect_type;
 #endif	/* !CONFIG_PPC64 */
 	/* Currently, we limit ourselves to 1 IO range and 3 mem