phb4: Workaround bug in spec 053

Wait for DLP PGRESET to clear *after* lifting the PCIe core reset

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

hw/phb4.c

@@ -3544,8 +3544,7 @@ static void phb4_init_hw(struct phb4 *p, bool first_init)
 	       in_be64(p->regs + PHB_PCIE_SCR));
 
 	/* Init_5 - Wait for DLP PGRESET to clear */
-	if (!phb4_wait_dlp_reset(p))
-		goto failed;
+	/* This is broken in spec 053, moving that step to after Init_16 */
 
 	/* Init_6 - deassert CFG reset */
 	creset = in_be64(p->regs + PHB_PCIE_CRESET);
@@ -3582,6 +3581,10 @@ static void phb4_init_hw(struct phb4 *p, bool first_init)
 	creset |= PHB_PCIE_CRESET_PIPE_N;
 	out_be64(p->regs + PHB_PCIE_CRESET,			   creset);
 
+	/* (Moved from Init_5) */
+	if (!phb4_wait_dlp_reset(p))
+		goto failed;
+
 	/* Init_17 - PHB Control */
 	val = PHB_CTRLR_IRQ_PGSZ_64K;
 	if (p->rev == PHB4_REV_NIMBUS_DD10) {