linux-kernel - [PATCH 3/3] PCI: iproc: Display PCIe Link information

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Message-Id: <1585206447-1363-4-git-send-email-srinath.mannam@broadcom.com>
Date:   Thu, 26 Mar 2020 12:37:27 +0530
From:   Srinath Mannam <srinath.mannam@...adcom.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Andrew Murray <andrew.murray@....com>
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Srinath Mannam <srinath.mannam@...adcom.com>
Subject: [PATCH 3/3] PCI: iproc: Display PCIe Link information

Add more comprehensive information to show PCIe link speed and link
width to the console.

Signed-off-by: Srinath Mannam <srinath.mannam@...adcom.com>
---
 drivers/pci/controller/pcie-iproc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
index e7f0d58..ed41357 100644
--- a/drivers/pci/controller/pcie-iproc.c
+++ b/drivers/pci/controller/pcie-iproc.c
@@ -823,6 +823,8 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
 #define PCI_TARGET_LINK_SPEED_MASK	0xf
 #define PCI_TARGET_LINK_SPEED_GEN2	0x2
 #define PCI_TARGET_LINK_SPEED_GEN1	0x1
+#define PCI_TARGET_LINK_WIDTH_MASK	0x3f
+#define PCI_TARGET_LINK_WIDTH_OFFSET	0x4
 		iproc_pci_raw_config_read32(pcie, 0,
 					    IPROC_PCI_EXP_CAP + PCI_EXP_LNKCTL2,
 					    4, &link_ctrl);
@@ -843,7 +845,14 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
 		}
 	}
 
-	dev_info(dev, "link: %s\n", link_is_active ? "UP" : "DOWN");
+	if (link_is_active) {
+		dev_info(dev, "link UP @ Speed Gen-%d and width-x%d\n",
+			 link_status & PCI_TARGET_LINK_SPEED_MASK,
+			 (link_status >> PCI_TARGET_LINK_WIDTH_OFFSET) &
+			 PCI_TARGET_LINK_WIDTH_MASK);
+	} else {
+		dev_info(dev, "link DOWN\n");
+	}
 
 	return link_is_active ? 0 : -ENODEV;
 }
-- 
2.7.4