linux-kernel - [PATCH 5.4 100/232] PCI/ASPM: Clear the correct bits when enabling L1 substates

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Date:   Thu, 16 Apr 2020 15:23:14 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yicong Yang <yangyicong@...ilicon.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 5.4 100/232] PCI/ASPM: Clear the correct bits when enabling L1 substates

From: Yicong Yang <yangyicong@...ilicon.com>

commit 58a3862a10a317a81097ab0c78aecebabb1704f5 upstream.

In pcie_config_aspm_l1ss(), we cleared the wrong bits when enabling ASPM L1
Substates.  Instead of the L1.x enable bits (PCI_L1SS_CTL1_L1SS_MASK, 0xf), we
cleared the Link Activation Interrupt Enable bit (PCI_L1SS_CAP_L1_PM_SS,
0x10).

Clear the L1.x enable bits before writing the new L1.x configuration.

[bhelgaas: changelog]
Fixes: aeda9adebab8 ("PCI/ASPM: Configure L1 substate settings")
Link: https://lore.kernel.org/r/1584093227-1292-1-git-send-email-yangyicong@hisilicon.com
Signed-off-by: Yicong Yang <yangyicong@...ilicon.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
CC: stable@...r.kernel.org	# v4.11+
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pci/pcie/aspm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -742,9 +742,9 @@ static void pcie_config_aspm_l1ss(struct
 
 	/* Enable what we need to enable */
 	pci_clear_and_set_dword(parent, up_cap_ptr + PCI_L1SS_CTL1,
-				PCI_L1SS_CAP_L1_PM_SS, val);
+				PCI_L1SS_CTL1_L1SS_MASK, val);
 	pci_clear_and_set_dword(child, dw_cap_ptr + PCI_L1SS_CTL1,
-				PCI_L1SS_CAP_L1_PM_SS, val);
+				PCI_L1SS_CTL1_L1SS_MASK, val);
 }
 
 static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val)