This is a note to let you know that I've just added the patch titled
PCI/ASPM: Use correct capability pointer to program LTR_L1.2_THRESHOLD
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: pci-aspm-use-correct-capability-pointer-to-program-ltr_l1.2_threshold.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From c00054f540bf81e592e1fee709b0bdbf20f478b5 Mon Sep 17 00:00:00 2001
From: Bjorn Helgaas bhelgaas@google.com Date: Mon, 13 Nov 2017 15:05:50 -0600 Subject: PCI/ASPM: Use correct capability pointer to program LTR_L1.2_THRESHOLD
From: Bjorn Helgaas bhelgaas@google.com
commit c00054f540bf81e592e1fee709b0bdbf20f478b5 upstream.
Previously we programmed the LTR_L1.2_THRESHOLD in the parent (upstream) device using the capability pointer of the *child* (downstream) device, which corrupted some random word of the parent's config space.
Use the parent's L1 SS capability pointer to program its LTR_L1.2_THRESHOLD.
Fixes: aeda9adebab8 ("PCI/ASPM: Configure L1 substate settings") Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Vidya Sagar vidyas@nvidia.com CC: Rajat Jain rajatja@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/pci/pcie/aspm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -658,7 +658,7 @@ static void pcie_config_aspm_l1ss(struct 0xFF00, link->l1ss.ctl1);
/* Program LTR L1.2 threshold in both ports */ - pci_clear_and_set_dword(parent, dw_cap_ptr + PCI_L1SS_CTL1, + pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1, 0xE3FF0000, link->l1ss.ctl1); pci_clear_and_set_dword(child, dw_cap_ptr + PCI_L1SS_CTL1, 0xE3FF0000, link->l1ss.ctl1);
Patches currently in stable-queue which might be from bhelgaas@google.com are
queue-4.14/pci-hv-use-effective-affinity-mask.patch queue-4.14/pci-set-cavium-acs-capability-quirk-flags-to-assert-rr-cr-sv-uf.patch queue-4.14/pci-aspm-account-for-downstream-device-s-port-common_mode_restore_time.patch queue-4.14/pci-aspm-use-correct-capability-pointer-to-program-ltr_l1.2_threshold.patch queue-4.14/pci-apply-cavium-thunderx-acs-quirk-to-more-root-ports.patch