This is a note to let you know that I've just added the patch titled
wifi: ath11k: Use RMW accessors for changing LNKCTL
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-ath11k-use-rmw-accessors-for-changing-lnkctl.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c9be9f46c8f9470e0750f1bd3f39c6810535eaca
Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Mon Jul 17 15:05:00 2023 +0300
wifi: ath11k: Use RMW accessors for changing LNKCTL
[ Upstream commit 6c1b6bdb34aaf8f94f65a9cae1d63490320c11bc ]
Don't assume that only the driver would be accessing LNKCTL. ASPM policy
changes can trigger write to LNKCTL outside of driver's control.
Use RMW capability accessors which do proper locking to avoid losing
concurrent updates to the register value. On restore, clear the ASPMC field
properly.
Suggested-by: Lukas Wunner <lukas@xxxxxxxxx>
Fixes: e9603f4bdcc0 ("ath11k: pci: disable ASPM L0sLs before downloading firmware")
Link: https://lore.kernel.org/r/20230717120503.15276-9-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Acked-by: Kalle Valo <kvalo@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/ath/ath11k/pci.c b/drivers/net/wireless/ath/ath11k/pci.c
index bfa7f8d96d82f..b8e4c74254642 100644
--- a/drivers/net/wireless/ath/ath11k/pci.c
+++ b/drivers/net/wireless/ath/ath11k/pci.c
@@ -1000,8 +1000,8 @@ static void ath11k_pci_aspm_disable(struct ath11k_pci *ab_pci)
u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1));
/* disable L0s and L1 */
- pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
- ab_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+ pcie_capability_clear_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+ PCI_EXP_LNKCTL_ASPMC);
set_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags);
}
@@ -1009,8 +1009,10 @@ static void ath11k_pci_aspm_disable(struct ath11k_pci *ab_pci)
static void ath11k_pci_aspm_restore(struct ath11k_pci *ab_pci)
{
if (test_and_clear_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags))
- pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
- ab_pci->link_ctl);
+ pcie_capability_clear_and_set_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+ PCI_EXP_LNKCTL_ASPMC,
+ ab_pci->link_ctl &
+ PCI_EXP_LNKCTL_ASPMC);
}
static int ath11k_pci_power_up(struct ath11k_base *ab)
