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-rw-r--r--drivers/net/wireless/ath/ath9k/pci.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index ccdf20a2e9b..170c5b32e49 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -87,6 +87,7 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
struct ath_softc *sc;
struct ieee80211_hw *hw;
u8 csz;
+ u32 val;
int ret = 0;
struct ath_hw *ah;
@@ -133,6 +134,14 @@ static int ath_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_master(pdev);
+ /*
+ * Disable the RETRY_TIMEOUT register (0x41) to keep
+ * PCI Tx retries from interfering with C3 CPU state.
+ */
+ pci_read_config_dword(pdev, 0x40, &val);
+ if ((val & 0x0000ff00) != 0)
+ pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);
+
ret = pci_request_region(pdev, 0, "ath9k");
if (ret) {
dev_err(&pdev->dev, "PCI memory region reserve error\n");
@@ -239,12 +248,21 @@ static int ath_pci_resume(struct pci_dev *pdev)
struct ieee80211_hw *hw = pci_get_drvdata(pdev);
struct ath_wiphy *aphy = hw->priv;
struct ath_softc *sc = aphy->sc;
+ u32 val;
int err;
err = pci_enable_device(pdev);
if (err)
return err;
pci_restore_state(pdev);
+ /*
+ * Suspend/Resume resets the PCI configuration space, so we have to
+ * re-disable the RETRY_TIMEOUT register (0x41) to keep
+ * PCI Tx retries from interfering with C3 CPU state
+ */
+ pci_read_config_dword(pdev, 0x40, &val);
+ if ((val & 0x0000ff00) != 0)
+ pci_write_config_dword(pdev, 0x40, val & 0xffff00ff);
/* Enable LED */
ath9k_hw_cfg_output(sc->sc_ah, ATH_LED_PIN,