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From 2793db3bb1f859bde77b40fd27da1452a06daf8d 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: [PATCH 07/10] 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(-)
diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index c1ffdb06c971..b02f8120c24b 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -1415,6 +1415,7 @@ static int mvebu_pcie_powerup(struct mvebu_pcie_port *port)
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);
@@ -1422,7 +1423,13 @@ static int mvebu_pcie_powerup(struct mvebu_pcie_port *port)
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;
@@ -1539,15 +1546,16 @@ static int mvebu_pcie_probe(struct platform_device *pdev)
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;
}
--
2.37.2
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