openwrt/target/linux/mvebu/patches-4.19/401-pci-mvebu-time-out-reset-on-link-up.patch

From 287b9df160b6159f8d385424904f8bac501280c1 Mon Sep 17 00:00:00 2001
From: Russell King <rmk+kernel@armlinux.org.uk>
Date: Sat, 9 Jul 2016 10:58:16 +0100
Subject: pci: mvebu: time out reset on link up

If the port reports that the link is up while we are resetting, there's
little point in waiting for the full duration.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
---
 drivers/pci/controller/pci-mvebu.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -1112,6 +1112,7 @@ static int mvebu_pcie_powerup(struct mve
 
 	if (port->reset_gpio) {
 		u32 reset_udelay = PCI_PM_D3COLD_WAIT * 1000;
+		unsigned int i;
 
 		of_property_read_u32(port->dn, "reset-delay-us",
 				     &reset_udelay);
@@ -1119,7 +1120,13 @@ static int mvebu_pcie_powerup(struct mve
 		udelay(100);
 
 		gpiod_set_value_cansleep(port->reset_gpio, 0);
-		msleep(reset_udelay / 1000);
+		for (i = 0; i < reset_udelay; i += 1000) {
+			if (mvebu_pcie_link_up(port))
+				break;
+			msleep(1);
+		}
+
+		printk("%s: reset completed in %dus\n", port->name, i);
 	}
 
 	return 0;
@@ -1283,15 +1290,16 @@ static int mvebu_pcie_probe(struct platf
 		if (!child)
 			continue;
 
-		ret = mvebu_pcie_powerup(port);
-		if (ret < 0)
-			continue;
-
 		port->base = mvebu_pcie_map_registers(pdev, child, port);
 		if (IS_ERR(port->base)) {
 			dev_err(dev, "%s: cannot map registers\n", port->name);
 			port->base = NULL;
-			mvebu_pcie_powerdown(port);
+			continue;
+		}
+
+		ret = mvebu_pcie_powerup(port);
+		if (ret < 0) {
+			port->base = NULL;
 			continue;
 		}