commit 8ff3de61fc5f9b3b21647bce081a3b7f710f0d4d
author Kumar Gala <galak@kernel.crashing.org> Fri Dec 07 12:17:34 2007 -0600
committer Kumar Gala <galak@kernel.crashing.org> Tue Dec 11 22:34:20 2007 -0600
tree 78409af74c00710d92724acc7f725b8726833d26
parent 82ac8c97145a4c3bf8b3dbfad00fa96e920f9b9c

Handle MPC85xx PCIe reset errata (PCI-Ex 38)

On the MPC85xx boards that have PCIe enable the PCIe errata fix.
(MPC8544DS, MPC8548CDS, MPC8568MDS).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

drivers/pci/fsl_pci_init.c

diff --git a/drivers/pci/fsl_pci_init.c b/drivers/pci/fsl_pci_init.c
index 1e77884..68e45e1 100644
--- a/drivers/pci/fsl_pci_init.c
+++ b/drivers/pci/fsl_pci_init.c
@@ -112,6 +112,29 @@
 		pci_hose_read_config_word(hose, dev, PCI_LTSSM, &ltssm);
 		enabled = ltssm >= PCI_LTSSM_L0;
 
+#ifdef CONFIG_FSL_PCIE_RESET
+		if (ltssm == 1) {
+			int i;
+			debug("....PCIe link error. "
+			      "LTSSM=0x%02x.", ltssm);
+			pci->pdb_stat |= 0x08000000; /* assert PCIe reset */
+			temp32 = pci->pdb_stat;
+			udelay(100);
+			debug("  Asserting PCIe reset @%x = %x\n",
+			      &pci->pdb_stat, pci->pdb_stat);
+			pci->pdb_stat &= ~0x08000000; /* clear reset */
+			asm("sync;isync");
+			for (i=0; i<100 && ltssm < PCI_LTSSM_L0; i++) {
+				pci_hose_read_config_word(hose, dev, PCI_LTSSM,
+							&ltssm);
+				udelay(1000);
+				debug("....PCIe link error. "
+				      "LTSSM=0x%02x.\n", ltssm);
+			}
+			enabled = ltssm >= PCI_LTSSM_L0;
+		}
+#endif
+
 		if (!enabled) {
 			debug("....PCIE link error.  Skipping scan."
 			      "LTSSM=0x%02x\n", ltssm);