[PATCH] PCI/ASPM: fix unexpected behavior when re-enabling L1

[Heiner Kallweit <hkallweit1@gmail.com>]

After the referenced commit we may see L1 sub-states being active
unexpectedly. Following scenario as an example:
r8169 disables L1 because of known hardware issues on a number of
systems. Implicitly L1.1 and L1.2 are disabled too.
On my system L1 and L1.1 work fine, but L1.2 causes missed
rx packets. Therefore I write 1 to aspm_l1_1.
This removes ASPM_STATE_L1 from the disabled modes and therefore
unexpectedly enables also L1.2. So return to the old behavior.

A comment in the commit message of the referenced change correctly points
out that this behavior is inconsistent with aspm_attr_store_common().
So change aspm_attr_store_common() accordingly.

Fixes: fb097dcd5a28 ("PCI/ASPM: Disable only ASPM_STATE_L1 when driver disables L1")
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 drivers/pci/pcie/aspm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 3dafba0b5..6d3788257 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1063,7 +1063,7 @@ static int __pci_disable_link_state(struct pci_dev *pdev, int state, bool sem)
 	if (state & PCIE_LINK_STATE_L0S)
 		link->aspm_disable |= ASPM_STATE_L0S;
 	if (state & PCIE_LINK_STATE_L1)
-		link->aspm_disable |= ASPM_STATE_L1;
+		link->aspm_disable |= ASPM_STATE_L1 | ASPM_STATE_L1SS;
 	if (state & PCIE_LINK_STATE_L1_1)
 		link->aspm_disable |= ASPM_STATE_L1_1;
 	if (state & PCIE_LINK_STATE_L1_2)
@@ -1251,6 +1251,8 @@ static ssize_t aspm_attr_store_common(struct device *dev,
 			link->aspm_disable &= ~ASPM_STATE_L1;
 	} else {
 		link->aspm_disable |= state;
+		if (state & ASPM_STATE_L1)
+			link->aspm_disable |= ASPM_STATE_L1SS;
 	}
 
 	pcie_config_aspm_link(link, policy_to_aspm_state(link));
-- 
2.42.0