linux-kernel - [PATCH 3.16 003/217] PCI: imx6: Move PHY reset into imx6_pcie_establish

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Date:	Wed, 27 Apr 2016 01:02:21 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Lucas Stach" <l.stach@...gutronix.de>,
	"Bjorn Helgaas" <bhelgaas@...gle.com>
Subject: [PATCH 3.16 003/217] PCI: imx6: Move PHY reset into
 imx6_pcie_establish_link()

3.16.35-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Lucas Stach <l.stach@...gutronix.de>

commit 54a47a83421a3b7ee0e0fab7f65d04179bdf59b6 upstream.

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.

Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
[bwh: Backported to 3.16:
 - Error paths were different in imx6_pcie_start_link()
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/pci/host/pci-imx6.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -305,10 +305,6 @@ static int imx6_pcie_wait_for_link(struc
 		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;
 	}
 
@@ -343,8 +339,10 @@ static int imx6_pcie_start_link(struct p
 			IMX6Q_GPR12_PCIE_CTL_2, 1 << 10);
 
 	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);
@@ -377,12 +375,21 @@ static int imx6_pcie_start_link(struct p
 
 	if (ret) {
 		dev_err(pp->dev, "Failed to bring link up!\n");
+		goto err_reset_phy;
 	} else {
 		tmp = readl(pp->dbi_base + 0x80);
 		dev_dbg(pp->dev, "Link up, Gen=%i\n", (tmp >> 16) & 0xf);
 	}
 
 	return ret;
+
+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)
@@ -470,11 +477,6 @@ static int imx6_pcie_link_up(struct pcie
 	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;
 }