[v4,10/11] wifi: ath10k: Use RMW accessors for changing LNKCTL
Commit Message
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 does proper locking to avoid losing
concurrent updates to the register value. On restore, clear the ASPMC
field properly.
Fixes: 76d870ed09ab ("ath10k: enable ASPM")
Suggested-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Acked-by: Kalle Valo <kvalo@kernel.org>
Cc: stable@vger.kernel.org
---
drivers/net/wireless/ath/ath10k/pci.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
@@ -1963,8 +1963,9 @@ static int ath10k_pci_hif_start(struct ath10k *ar)
ath10k_pci_irq_enable(ar);
ath10k_pci_rx_post(ar);
- pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL,
- ar_pci->link_ctl);
+ pcie_capability_clear_and_set_word(ar_pci->pdev, PCI_EXP_LNKCTL,
+ PCI_EXP_LNKCTL_ASPMC,
+ ar_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC);
return 0;
}
@@ -2821,8 +2822,8 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar,
pcie_capability_read_word(ar_pci->pdev, PCI_EXP_LNKCTL,
&ar_pci->link_ctl);
- pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL,
- ar_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+ pcie_capability_clear_word(ar_pci->pdev, PCI_EXP_LNKCTL,
+ PCI_EXP_LNKCTL_ASPMC);
/*
* Bring the target up cleanly.