3 files changed, 32 insertions, 11 deletions

diff --git a/drivers/pci/host/pcie-altera.c b/drivers/pci/host/pcie-altera.c
index e5dda38bdde5..99da549d5d06 100644
--- a/drivers/pci/host/pcie-altera.c
+++ b/drivers/pci/host/pcie-altera.c
@@ -55,8 +55,10 @@
 #define TLP_CFG_DW2(bus, devfn, offset)	\
 				(((bus) << 24) | ((devfn) << 16) | (offset))
 #define TLP_REQ_ID(bus, devfn)		(((bus) << 8) | (devfn))
+#define TLP_COMP_STATUS(s)		(((s) >> 12) & 7)
 #define TLP_HDR_SIZE			3
 #define TLP_LOOP			500
+#define RP_DEVFN			0
 
 #define INTX_NUM			4
 
@@ -166,34 +168,41 @@ static bool altera_pcie_valid_config(struct altera_pcie *pcie,
 
 static int tlp_read_packet(struct altera_pcie *pcie, u32 *value)
 {
-	u8 loop;
+	int i;
 	bool sop = 0;
 	u32 ctrl;
 	u32 reg0, reg1;
+	u32 comp_status = 1;
 
 	/*
 	 * Minimum 2 loops to read TLP headers and 1 loop to read data
 	 * payload.
 	 */
-	for (loop = 0; loop < TLP_LOOP; loop++) {
+	for (i = 0; i < TLP_LOOP; i++) {
 		ctrl = cra_readl(pcie, RP_RXCPL_STATUS);
 		if ((ctrl & RP_RXCPL_SOP) || (ctrl & RP_RXCPL_EOP) || sop) {
 			reg0 = cra_readl(pcie, RP_RXCPL_REG0);
 			reg1 = cra_readl(pcie, RP_RXCPL_REG1);
 
-			if (ctrl & RP_RXCPL_SOP)
+			if (ctrl & RP_RXCPL_SOP) {
 				sop = true;
+				comp_status = TLP_COMP_STATUS(reg1);
+			}
 
 			if (ctrl & RP_RXCPL_EOP) {
+				if (comp_status)
+					return PCIBIOS_DEVICE_NOT_FOUND;
+
 				if (value)
 					*value = reg0;
+
 				return PCIBIOS_SUCCESSFUL;
 			}
 		}
 		udelay(5);
 	}
 
-	return -ENOENT;
+	return PCIBIOS_DEVICE_NOT_FOUND;
 }
 
 static void tlp_write_packet(struct altera_pcie *pcie, u32 *headers,
@@ -233,7 +242,7 @@ static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
 	else
 		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGRD1);
 
-	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
+	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN),
 					TLP_READ_TAG, byte_en);
 	headers[2] = TLP_CFG_DW2(bus, devfn, where);
 
@@ -253,7 +262,7 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
 	else
 		headers[0] = TLP_CFG_DW0(TLP_FMTTYPE_CFGWR1);
 
-	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, devfn),
+	headers[1] = TLP_CFG_DW1(TLP_REQ_ID(pcie->root_bus_nr, RP_DEVFN),
 					TLP_WRITE_TAG, byte_en);
 	headers[2] = TLP_CFG_DW2(bus, devfn, where);
 
@@ -458,7 +467,7 @@ static int altera_pcie_init_irq_domain(struct altera_pcie *pcie)
 	struct device_node *node = dev->of_node;
 
 	/* Setup INTx */
-	pcie->irq_domain = irq_domain_add_linear(node, INTX_NUM,
+	pcie->irq_domain = irq_domain_add_linear(node, INTX_NUM + 1,
 					&intx_domain_ops, pcie);
 	if (!pcie->irq_domain) {
 		dev_err(dev, "Failed to get a INTx IRQ domain\n");
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 53e463244bb7..7eaa4c87fec7 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -54,7 +54,7 @@ static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	struct irq_domain *domain;
 
 	domain = pci_msi_get_domain(dev);
-	if (domain)
+	if (domain && irq_domain_is_hierarchy(domain))
 		return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
 
 	return arch_setup_msi_irqs(dev, nvec, type);
@@ -65,7 +65,7 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
 	struct irq_domain *domain;
 
 	domain = pci_msi_get_domain(dev);
-	if (domain)
+	if (domain && irq_domain_is_hierarchy(domain))
 		pci_msi_domain_free_irqs(domain, dev);
 	else
 		arch_teardown_msi_irqs(dev);
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 4446fcb5effd..d7ffd66814bb 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -1146,9 +1146,21 @@ static int pci_pm_runtime_suspend(struct device *dev)
 	pci_dev->state_saved = false;
 	pci_dev->no_d3cold = false;
 	error = pm->runtime_suspend(dev);
-	suspend_report_result(pm->runtime_suspend, error);
-	if (error)
+	if (error) {
+		/*
+		 * -EBUSY and -EAGAIN is used to request the runtime PM core
+		 * to schedule a new suspend, so log the event only with debug
+		 * log level.
+		 */
+		if (error == -EBUSY || error == -EAGAIN)
+			dev_dbg(dev, "can't suspend now (%pf returned %d)\n",
+				pm->runtime_suspend, error);
+		else
+			dev_err(dev, "can't suspend (%pf returned %d)\n",
+				pm->runtime_suspend, error);
+
 		return error;
+	}
 	if (!pci_dev->d3cold_allowed)
 		pci_dev->no_d3cold = true;