[PATCH] PCI: pciehp: Add check for DL_ACTIVE bit in pciehp_check_link_status()

Sanjay R Mehta
2020-10-06T18:24:56Z

From: Sanjay R Mehta <sanju.mehta@amd.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@amd.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