Kernel offer possibility to change ASPM settings using
/sys/module/pcie_aspm/parameters/policy interface. As settings can be
changed, we also need to change ath9k hw registers. Patch implement
this by monitoring power_off state, and based on that state setup
register when pci core inform us about ASPM change.
Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/hw-ops.h | 1 +
drivers/net/wireless/ath/ath9k/hw.h | 1 +
drivers/net/wireless/ath/ath9k/pci.c | 31 +++++++++++++++++++++++++++++++
3 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/hw-ops.h b/drivers/net/wireless/ath/ath9k/hw-ops.h
index dd9003e..0743e82 100644
--- a/drivers/net/wireless/ath/ath9k/hw-ops.h
+++ b/drivers/net/wireless/ath/ath9k/hw-ops.h
@@ -24,6 +24,7 @@
static inline void ath9k_hw_configpcipowersave(struct ath_hw *ah,
bool power_off)
{
+ ah->power_off = power_off;
if (ah->aspm_enabled != true)
return;
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index 6abf26d..eb736ca 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -672,6 +672,7 @@ struct ath_hw {
bool sw_mgmt_crypto;
bool is_pciexpress;
bool aspm_enabled;
+ bool power_off;
bool is_monitoring;
bool need_an_top2_fixup;
u16 tx_trig_level;
diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index a92e55f..c46920b 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -286,6 +286,34 @@ static void ath_pci_remove(struct pci_dev *pdev)
pci_release_region(pdev, 0);
}
+#ifdef CONFIG_PCIEASPM
+
+static void ath_pci_aspm_changed(struct pci_dev *pdev, u32 state)
+{
+ struct ieee80211_hw *hw = pci_get_drvdata(pdev);
+ struct ath_softc *sc = hw->priv;
+ struct ath_hw *ah = sc->sc_ah;
+
+ spin_lock_irq(&sc->sc_pcu_lock);
+
+ /*
+ * ASPM settings were changed, we have to configure PCIe PM and SERDES
+ * registers based on current state of device and new ASPM settings.
+ */
+ if (state & (PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1)) {
+ ah->aspm_enabled = true;
+ ath9k_hw_configpcipowersave(ah, ah->power_off);
+ } else {
+ if (!ah->power_off)
+ ath9k_hw_configpcipowersave(ah, true);
+ ah->aspm_enabled = false;
+ }
+
+ spin_unlock_irq(&sc->sc_pcu_lock);
+}
+
+#endif
+
#ifdef CONFIG_PM
static int ath_pci_suspend(struct device *device)
@@ -365,6 +393,9 @@ static struct pci_driver ath_pci_driver = {
.id_table = ath_pci_id_table,
.probe = ath_pci_probe,
.remove = ath_pci_remove,
+#ifdef CONFIG_PCIEASPM
+ .aspm_changed = ath_pci_aspm_changed,
+#endif
.driver.pm = ATH9K_PM_OPS,
};
--
1.7.1
--
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