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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>
This commit is contained in:
Stanislaw Gruszka 2011-08-05 13:10:34 +02:00 committed by John W. Linville
parent 3b9cf1be8c
commit 69ce674bfa
4 changed files with 29 additions and 29 deletions
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8
drivers/net/wireless/ath/ath9k/hw.c
View File

@ -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");

4
drivers/net/wireless/ath/ath9k/hw.h
View File

@ -1036,10 +1036,6 @@ 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

2
drivers/net/wireless/ath/ath9k/main.c
View File

@ -1145,8 +1145,6 @@ 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);
}

44
drivers/net/wireless/ath/ath9k/pci.c
View File

@ -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,
};