Merge branch 'pci/controller/linkup-fix'

- Rename PCIE_RESET_CONFIG_DEVICE_WAIT_MS to PCIE_RESET_CONFIG_WAIT_MS (the
  required delay before sending config requests after a reset) (Niklas
  Cassel)

- PCIE_T_RRS_READY_MS and PCIE_RESET_CONFIG_WAIT_MS were two names for the
  same delay; replace PCIE_T_RRS_READY_MS with PCIE_RESET_CONFIG_WAIT_MS
  and remove PCIE_T_RRS_READY_MS (Niklas Cassel)

- Add required PCIE_RESET_CONFIG_WAIT_MS delay after Link up IRQ to
  dw-rockchip, qcom (Niklas Cassel)

- Add required PCIE_RESET_CONFIG_WAIT_MS after waiting for Link up on
  Ports that support > 5.0 GT/s in dwc core (Niklas Cassel)

- Move LINK_WAIT_SLEEP_MS and LINK_WAIT_MAX_RETRIES to pci.h and prefix
  with 'PCIE_' for potential sharing across drivers (Niklas Cassel)

* pci/controller/linkup-fix:
  PCI: Move link up wait time and max retries macros to pci.h
  PCI: dwc: Ensure that dw_pcie_wait_for_link() waits 100 ms after link up
  PCI: qcom: Wait PCIE_RESET_CONFIG_WAIT_MS after link-up IRQ
  PCI: dw-rockchip: Wait PCIE_RESET_CONFIG_WAIT_MS after link-up IRQ
  PCI: rockchip-host: Use macro PCIE_RESET_CONFIG_WAIT_MS
  PCI: Rename PCIE_RESET_CONFIG_DEVICE_WAIT_MS to PCIE_RESET_CONFIG_WAIT_MS

Author: bjorn-helgaas

drivers/pci/controller/dwc/pcie-designware.c

@@ -702,18 +702,26 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci)
 	int retries;
 
 	/* Check if the link is up or not */
-	for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) {
+	for (retries = 0; retries < PCIE_LINK_WAIT_MAX_RETRIES; retries++) {
 		if (dw_pcie_link_up(pci))
 			break;
 
-		msleep(LINK_WAIT_SLEEP_MS);
+		msleep(PCIE_LINK_WAIT_SLEEP_MS);
 	}
 
-	if (retries >= LINK_WAIT_MAX_RETRIES) {
+	if (retries >= PCIE_LINK_WAIT_MAX_RETRIES) {
 		dev_info(pci->dev, "Phy link never came up\n");
 		return -ETIMEDOUT;
 	}
 
+	/*
+	 * As per PCIe r6.0, sec 6.6.1, a Downstream Port that supports Link
+	 * speeds greater than 5.0 GT/s, software must wait a minimum of 100 ms
+	 * after Link training completes before sending a Configuration Request.
+	 */
+	if (pci->max_link_speed > 2)
+		msleep(PCIE_RESET_CONFIG_WAIT_MS);
+
 	offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
 	val = dw_pcie_readw_dbi(pci, offset + PCI_EXP_LNKSTA);
 

drivers/pci/controller/dwc/pcie-designware.h

@@ -62,10 +62,6 @@
 #define dw_pcie_cap_set(_pci, _cap) \
 	set_bit(DW_PCIE_CAP_ ## _cap, &(_pci)->caps)
 
-/* Parameters for the waiting for link up routine */
-#define LINK_WAIT_MAX_RETRIES		10
-#define LINK_WAIT_SLEEP_MS		90
-
 /* Parameters for the waiting for iATU enabled routine */
 #define LINK_WAIT_MAX_IATU_RETRIES	5
 #define LINK_WAIT_IATU			9

drivers/pci/controller/dwc/pcie-dw-rockchip.c

@@ -458,6 +458,7 @@ static irqreturn_t rockchip_pcie_rc_sys_irq_thread(int irq, void *arg)
 
 	if (reg & PCIE_RDLH_LINK_UP_CHGED) {
 		if (rockchip_pcie_link_up(pci)) {
+			msleep(PCIE_RESET_CONFIG_WAIT_MS);
 			dev_dbg(dev, "Received Link up event. Starting enumeration!\n");
 			/* Rescan the bus to enumerate endpoint devices */
 			pci_lock_rescan_remove();

drivers/pci/controller/dwc/pcie-qcom.c

@@ -1564,6 +1564,7 @@ static irqreturn_t qcom_pcie_global_irq_thread(int irq, void *data)
 	writel_relaxed(status, pcie->parf + PARF_INT_ALL_CLEAR);
 
 	if (FIELD_GET(PARF_INT_ALL_LINK_UP, status)) {
+		msleep(PCIE_RESET_CONFIG_WAIT_MS);
 		dev_dbg(dev, "Received Link up event. Starting enumeration!\n");
 		/* Rescan the bus to enumerate endpoint devices */
 		pci_lock_rescan_remove();

drivers/pci/controller/pcie-rockchip-host.c

@@ -325,7 +325,7 @@ static int rockchip_pcie_host_init_port(struct rockchip_pcie *rockchip)
 	msleep(PCIE_T_PVPERL_MS);
 	gpiod_set_value_cansleep(rockchip->perst_gpio, 1);
 
-	msleep(PCIE_T_RRS_READY_MS);
+	msleep(PCIE_RESET_CONFIG_WAIT_MS);
 
 	/* 500ms timeout value should be enough for Gen1/2 training */
 	err = readl_poll_timeout(rockchip->apb_base + PCIE_CLIENT_BASIC_STATUS1,

drivers/pci/controller/plda/pcie-starfive.c

@@ -368,7 +368,7 @@ static int starfive_pcie_host_init(struct plda_pcie_rp *plda)
 	 * of 100ms following exit from a conventional reset before
 	 * sending a configuration request to the device.
 	 */
-	msleep(PCIE_RESET_CONFIG_DEVICE_WAIT_MS);
+	msleep(PCIE_RESET_CONFIG_WAIT_MS);
 
 	if (starfive_pcie_host_wait_for_link(pcie))
 		dev_info(dev, "port link down\n");

drivers/pci/pci.h

@@ -35,13 +35,6 @@ struct pcie_tlp_log;
  */
 #define PCIE_T_PERST_CLK_US		100
 
-/*
- * End of conventional reset (PERST# de-asserted) to first configuration
- * request (device able to respond with a "Request Retry Status" completion),
- * from PCIe r6.0, sec 6.6.1.
- */
-#define PCIE_T_RRS_READY_MS	100
-
 /*
  * PCIe r6.0, sec 5.3.3.2.1 <PME Synchronization>
  * Recommends 1ms to 10ms timeout to check L2 ready.
@@ -61,7 +54,11 @@ struct pcie_tlp_log;
  *    completes before sending a Configuration Request to the device
  *    immediately below that Port."
  */
-#define PCIE_RESET_CONFIG_DEVICE_WAIT_MS	100
+#define PCIE_RESET_CONFIG_WAIT_MS	100
+
+/* Parameters for the waiting for link up routine */
+#define PCIE_LINK_WAIT_MAX_RETRIES	10
+#define PCIE_LINK_WAIT_SLEEP_MS		90
 
 /* Message Routing (r[2:0]); PCIe r6.0, sec 2.2.8 */
 #define PCIE_MSG_TYPE_R_RC	0