iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PCI: Clarify intent of LT wait

Browse Source 
Clarify the comment relating to the LT wait and the purpose of the check
that implements the implementation note in PCIe r6.1 sec 7.5.3.7.

Suggested-by: Maciej W. Rozycki <macro@orcam.me.uk>
Link: https://lore.kernel.org/r/20240423130820.43824-2-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Ilpo Järvinen 2024-04-23 16:08:20 +03:00 committed by Bjorn Helgaas
parent 73cb3a35f9
commit cdc6c4abcb
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/pci/pci.c
View File

@ -4625,9 +4625,10 @@ int pcie_retrain_link(struct pci_dev *pdev, bool use_lt)
/*
* Ensure the updated LNKCTL parameters are used during link
* training by checking that there is no ongoing link training to
* avoid LTSSM race as recommended in Implementation Note at the
* end of PCIe r6.0.1 sec 7.5.3.7.
* training by checking that there is no ongoing link training that
* may have started before link parameters were changed, so as to
* avoid LTSSM race as recommended in Implementation Note at the end
* of PCIe r6.1 sec 7.5.3.7.
*/
rc = pcie_wait_for_link_status(pdev, true, false);
if (rc)