ath9k: do btcoex ASPM disabling at initialization time
Disable ASPM in pci ->probe on upstream (device) and downstream
(PCIe port) component. According to e1000e driver authors this is
required. I did not find that requirement in PCIe spec, but it seems
to be logical for me.
This need to be fixed for CONFIG_PCIEASPM, that will be done later ...
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index 65cf728..daa26b5 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -89,23 +89,6 @@
return true;
}
-/*
- * Bluetooth coexistance requires disabling ASPM.
- */
-static void ath_pci_bt_coex_prep(struct ath_common *common)
-{
- struct ath_softc *sc = (struct ath_softc *) common->priv;
- struct pci_dev *pdev = to_pci_dev(sc->dev);
- u8 aspm;
-
- if (!pci_is_pcie(pdev))
- return;
-
- pci_read_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, &aspm);
- aspm &= ~(ATH_PCIE_CAP_LINK_L0S | ATH_PCIE_CAP_LINK_L1);
- pci_write_config_byte(pdev, ATH_PCIE_CAP_LINK_CTRL, aspm);
-}
-
static void ath_pci_extn_synch_enable(struct ath_common *common)
{
struct ath_softc *sc = (struct ath_softc *) common->priv;
@@ -117,6 +100,7 @@
pci_write_config_byte(pdev, sc->sc_ah->caps.pcie_lcr_offset, lnkctl);
}
+/* Need to be called after we discover btcoex capabilities */
static void ath_pci_aspm_init(struct ath_common *common)
{
struct ath_softc *sc = (struct ath_softc *) common->priv;
@@ -126,10 +110,33 @@
int pos;
u8 aspm;
- if (!pci_is_pcie(pdev))
+ pos = pci_pcie_cap(pdev);
+ if (!pos)
return;
parent = pdev->bus->self;
+
+ if (ah->btcoex_hw.scheme != ATH_BTCOEX_CFG_NONE) {
+ /* Bluetooth coexistance requires disabling ASPM. */
+ pci_read_config_byte(pdev, pos + PCI_EXP_LNKCTL, &aspm);
+ aspm &= ~(PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
+ pci_write_config_byte(pdev, pos + PCI_EXP_LNKCTL, aspm);
+
+ /*
+ * Both upstream and downstream PCIe components should
+ * have the same ASPM settings.
+ */
+ if (WARN_ON(!parent))
+ return;
+
+ pos = pci_pcie_cap(parent);
+ pci_read_config_byte(parent, pos + PCI_EXP_LNKCTL, &aspm);
+ aspm &= ~(PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
+ pci_write_config_byte(parent, pos + PCI_EXP_LNKCTL, aspm);
+
+ return;
+ }
+
if (WARN_ON(!parent))
return;
@@ -146,7 +153,6 @@
.ath_bus_type = ATH_PCI,
.read_cachesize = ath_pci_read_cachesize,
.eeprom_read = ath_pci_eeprom_read,
- .bt_coex_prep = ath_pci_bt_coex_prep,
.extn_synch_en = ath_pci_extn_synch_enable,
.aspm_init = ath_pci_aspm_init,
};