From 66a60f934701e282e596c97a3df22e4e5a7c2d68 Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Thu, 12 Dec 2013 22:50:01 +0100
Subject: [PATCH] PCI: imx6: Factor out link up wait loop
Split the function that waits for the PCIe link to come up from the rest if
the host init function. We will find this change useful in the subsequent
patch, since this will be called twice then.
No functional change.
[bhelgaas: remove useless "return;"]
Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>
---
drivers/pci/host/pci-imx6.c | 34 ++++++++++++++++++++--------------
1 file changed, 20 insertions(+), 14 deletions(-)
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 25dde2c7b445a..d81da4556c19b 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -304,6 +304,25 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
IMX6Q_GPR8_TX_SWING_LOW, 127 << 25);
}
+static int imx6_pcie_wait_for_link(struct pcie_port *pp)
+{
+ int count = 200;
+
+ while (!dw_pcie_link_up(pp)) {
+ usleep_range(100, 1000);
+ if (--count)
+ continue;
+
+ dev_err(pp->dev, "phy link never came up\n");
+ dev_dbg(pp->dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
+ readl(pp->dbi_base + PCIE_PHY_DEBUG_R0),
+ readl(pp->dbi_base + PCIE_PHY_DEBUG_R1));
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static void imx6_pcie_host_init(struct pcie_port *pp)
{
int count = 0;
@@ -320,20 +339,7 @@ static void imx6_pcie_host_init(struct pcie_port *pp)
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
- while (!dw_pcie_link_up(pp)) {
- usleep_range(100, 1000);
- count++;
- if (count >= 200) {
- dev_err(pp->dev, "phy link never came up\n");
- dev_dbg(pp->dev,
- "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
- readl(pp->dbi_base + PCIE_PHY_DEBUG_R0),
- readl(pp->dbi_base + PCIE_PHY_DEBUG_R1));
- break;
- }
- }
-
- return;
+ imx6_pcie_wait_for_link(pp);
}
static void imx6_pcie_reset_phy(struct pcie_port *pp)
--
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