linux-kernel - [PATCH] PCI: pciehp: Add check for DL_ACTIVE bit in pciehp_check_link

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Message-Id: <1602008668-43646-1-git-send-email-Sanju.Mehta@amd.com>
Date:   Tue,  6 Oct 2020 13:24:28 -0500
From:   Sanjay R Mehta <Sanju.Mehta@....com>
To:     bhelgaas@...gle.com, lukas@...ner.de,
        andriy.shevchenko@...ux.intel.com, stuart.w.hayes@...il.com,
        mr.nuke.me@...il.com
Cc:     linux-kernel@...r.kernel.org, Sanjay R Mehta <sanju.mehta@....com>
Subject: [PATCH] PCI: pciehp: Add check for DL_ACTIVE bit in pciehp_check_link_status()

From: Sanjay R Mehta <sanju.mehta@....com>

if DL_ACTIVE bit is set it means that there is no need to check
PCI_EXP_LNKSTA_LT bit, as DL_ACTIVE would have set only if the link
is already trained. Hence adding a check which takes care of this
scenario.

Signed-off-by: Sanjay R Mehta <sanju.mehta@....com>
---
 drivers/pci/hotplug/pciehp_hpc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 53433b3..81d1348 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -309,7 +309,8 @@ int pciehp_check_link_status(struct controller *ctrl)
 
 	pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
 	ctrl_dbg(ctrl, "%s: lnk_status = %x\n", __func__, lnk_status);
-	if ((lnk_status & PCI_EXP_LNKSTA_LT) ||
+	if (((lnk_status & PCI_EXP_LNKSTA_LT) &
+	     !(lnk_status & PCI_EXP_DPC_CAP_DL_ACTIVE)) ||
 	    !(lnk_status & PCI_EXP_LNKSTA_NLW)) {
 		ctrl_err(ctrl, "link training error: status %#06x\n",
 			 lnk_status);
-- 
2.7.4