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@xxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/hw.c | 8 +++---
drivers/net/wireless/ath/ath9k/hw.h | 4 ---
drivers/net/wireless/ath/ath9k/main.c | 2 -
drivers/net/wireless/ath/ath9k/pci.c | 44 ++++++++++++++++++--------------
4 files changed, 29 insertions(+), 29 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c
index 8dcefe7..71cfe1a 100644
--- a/drivers/net/wireless/ath/ath9k/hw.c
+++ b/drivers/net/wireless/ath/ath9k/hw.c
@@ -603,10 +603,7 @@ static int __ath9k_hw_init(struct ath_hw *ah)
ath9k_hw_init_mode_regs(ah);
-
- if (ah->is_pciexpress)
- ath9k_hw_aspm_init(ah);
- else
+ if (!ah->is_pciexpress)
ath9k_hw_disablepcie(ah);
if (!AR_SREV_9300_20_OR_LATER(ah))
@@ -621,6 +618,9 @@ static int __ath9k_hw_init(struct ath_hw *ah)
if (r)
return r;
+ if (ah->is_pciexpress)
+ ath9k_hw_aspm_init(ah);
+
r = ath9k_hw_init_macaddr(ah);
if (r) {
ath_err(common, "Failed to initialize MAC address\n");
diff --git a/drivers/net/wireless/ath/ath9k/hw.h b/drivers/net/wireless/ath/ath9k/hw.h
index a26a8c5..f28f339 100644
--- a/drivers/net/wireless/ath/ath9k/hw.h
+++ b/drivers/net/wireless/ath/ath9k/hw.h
@@ -1029,10 +1029,6 @@ void ath9k_ani_reset(struct ath_hw *ah, bool is_scanning);
void ath9k_hw_proc_mib_event(struct ath_hw *ah);
void ath9k_hw_ani_monitor(struct ath_hw *ah, struct ath9k_channel *chan);
-#define ATH_PCIE_CAP_LINK_CTRL 0x70
-#define ATH_PCIE_CAP_LINK_L0S 1
-#define ATH_PCIE_CAP_LINK_L1 2
-
#define ATH9K_CLOCK_RATE_CCK 22
#define ATH9K_CLOCK_RATE_5GHZ_OFDM 40
#define ATH9K_CLOCK_RATE_2GHZ_OFDM 44
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index 651f633..b0389c3 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -1141,8 +1141,6 @@ static int ath9k_start(struct ieee80211_hw *hw)
AR_STOMP_LOW_WLAN_WGHT);
ath9k_hw_btcoex_enable(ah);
- if (common->bus_ops->bt_coex_prep)
- common->bus_ops->bt_coex_prep(common);
if (ah->btcoex_hw.scheme == ATH_BTCOEX_CFG_3WIRE)
ath9k_btcoex_timer_resume(sc);
}
diff --git a/drivers/net/wireless/ath/ath9k/pci.c b/drivers/net/wireless/ath/ath9k/pci.c
index 8256e97..7d94b64 100644
--- a/drivers/net/wireless/ath/ath9k/pci.c
+++ b/drivers/net/wireless/ath/ath9k/pci.c
@@ -89,23 +89,6 @@ static bool ath_pci_eeprom_read(struct ath_common *common, u32 off, u16 *data)
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 @@ static void ath_pci_extn_synch_enable(struct ath_common *common)
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 @@ static void ath_pci_aspm_init(struct ath_common *common)
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 @@ static const struct ath_bus_ops ath_pci_bus_ops = {
.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,
};
--
1.7.1
--
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