linux-kernel - [PATCH v1 2/4] PCI/ASPM: Use correct capability pointer to program LTR_L1.2

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Message-ID: <20171113231200.4120.54400.stgit@bhelgaas-glaptop.roam.corp.google.com>
Date:   Mon, 13 Nov 2017 17:12:00 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Rajat Jain <rajatja@...gle.com>, linux-kernel@...r.kernel.org,
        Vidya Sagar <vidyas@...dia.com>
Subject: [PATCH v1 2/4] PCI/ASPM: Use correct capability pointer to program
 LTR_L1.2_THRESHOLD

From: Bjorn Helgaas <bhelgaas@...gle.com>

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@...gle.com>
CC: stable@...r.kernel.org	# v4.11+
CC: Rajat Jain <rajatja@...gle.com>
---
 drivers/pci/pcie/aspm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 46c59afb8355..a378dd9d2473 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -657,7 +657,7 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state)
 					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);