[PATCH 7/9] PCI: imx6: Move PHY reset into imx6_pcie_establish_link()

[Andrey Smirnov]

This adds the PHY reset into a common error path of
imx6_pcie_establish_link(), deduplicating some of the debug prints.  Also
reduce the severity of the "no-link" message in the one place where it is
expected to be hit when no peripheral is attached.

[Andrey Smirnov: port to Barebox codebase]

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas at google.com>
Signed-off-by: Andrey Smirnov <andrew.smirnov at gmail.com>
---
 drivers/pci/pci-imx6.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/pci-imx6.c b/drivers/pci/pci-imx6.c
index fd53d36..c564a60 100644
--- a/drivers/pci/pci-imx6.c
+++ b/drivers/pci/pci-imx6.c
@@ -399,10 +399,6 @@ static int imx6_pcie_wait_for_link(struct pcie_port *pp)
 		if (!is_timeout(start, SECOND))
 			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;
 	}
 }
@@ -447,8 +443,10 @@ static int imx6_pcie_establish_link(struct pcie_port *pp)
 	writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
 
 	ret = imx6_pcie_wait_for_link(pp);
-	if (ret)
-		return ret;
+	if (ret) {
+		dev_info(pp->dev, "Link never came up\n");
+		goto err_reset_phy;
+	}
 
 	/* Allow Gen2 mode after the link is up. */
 	tmp = readl(pp->dbi_base + PCIE_RC_LCR);
@@ -467,19 +465,28 @@ static int imx6_pcie_establish_link(struct pcie_port *pp)
 	ret = imx6_pcie_wait_for_speed_change(pp);
 	if (ret) {
 		dev_err(pp->dev, "Failed to bring link up!\n");
-		return ret;
+		goto err_reset_phy;
 	}
 
 	/* Make sure link training is finished as well! */
 	ret = imx6_pcie_wait_for_link(pp);
 	if (ret) {
 		dev_err(pp->dev, "Failed to bring link up!\n");
-		return ret;
+		goto err_reset_phy;
 	}
 
 	tmp = readl(pp->dbi_base + PCIE_RC_LCSR);
 	dev_dbg(pp->dev, "Link up, Gen=%i\n", (tmp >> 16) & 0xf);
+	
 	return 0;
+
+err_reset_phy:
+       dev_dbg(pp->dev, "PHY 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));
+       imx6_pcie_reset_phy(pp);
+
+       return ret;
 }
 
 static void imx6_pcie_host_init(struct pcie_port *pp)
@@ -547,11 +554,6 @@ static int imx6_pcie_link_up(struct pcie_port *pp)
 	if ((debug_r0 & 0x3f) != 0x0d)
 		return 0;
 
-	dev_err(pp->dev, "transition to gen2 is stuck, reset PHY!\n");
-	dev_dbg(pp->dev, "debug_r0=%08x debug_r1=%08x\n", debug_r0, rc);
-
-	imx6_pcie_reset_phy(pp);
-
 	return 0;
 }
 
-- 
2.5.5