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linux-next/drivers/net/wireless/rtlwifi/ps.c
Mike McCormack 312d5479dc rtlwifi: Don't block interrupts in spinlocks
Now power state transitions are not called from an
interrupt context, there's no need to block interrupts.

This code appears to block interrupts for too long,
causing my trackpad to lose sync occasionally.

Signed-off-by: Mike McCormack <mikem@ring3k.org>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-06-03 15:01:05 -04:00

699 lines
17 KiB
C

/******************************************************************************
*
* Copyright(c) 2009-2010 Realtek Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* wlanfae <wlanfae@realtek.com>
* Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
* Hsinchu 300, Taiwan.
*
* Larry Finger <Larry.Finger@lwfinger.net>
*
*****************************************************************************/
#include "wifi.h"
#include "base.h"
#include "ps.h"
bool rtl_ps_enable_nic(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
/*<1> reset trx ring */
if (rtlhal->interface == INTF_PCI)
rtlpriv->intf_ops->reset_trx_ring(hw);
if (is_hal_stop(rtlhal))
RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
("Driver is already down!\n"));
/*<2> Enable Adapter */
rtlpriv->cfg->ops->hw_init(hw);
RT_CLEAR_PS_LEVEL(ppsc, RT_RF_OFF_LEVL_HALT_NIC);
/*<3> Enable Interrupt */
rtlpriv->cfg->ops->enable_interrupt(hw);
/*<enable timer> */
rtl_watch_dog_timer_callback((unsigned long)hw);
return true;
}
EXPORT_SYMBOL(rtl_ps_enable_nic);
bool rtl_ps_disable_nic(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
/*<1> Stop all timer */
rtl_deinit_deferred_work(hw);
/*<2> Disable Interrupt */
rtlpriv->cfg->ops->disable_interrupt(hw);
tasklet_kill(&rtlpriv->works.irq_tasklet);
/*<3> Disable Adapter */
rtlpriv->cfg->ops->hw_disable(hw);
return true;
}
EXPORT_SYMBOL(rtl_ps_disable_nic);
bool rtl_ps_set_rf_state(struct ieee80211_hw *hw,
enum rf_pwrstate state_toset,
u32 changesource, bool protect_or_not)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
bool actionallowed = false;
u16 rfwait_cnt = 0;
/*protect_or_not = true; */
if (protect_or_not)
goto no_protect;
/*
*Only one thread can change
*the RF state at one time, and others
*should wait to be executed.
*/
while (true) {
spin_lock(&rtlpriv->locks.rf_ps_lock);
if (ppsc->rfchange_inprogress) {
spin_unlock(&rtlpriv->locks.rf_ps_lock);
RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
("RF Change in progress!"
"Wait to set..state_toset(%d).\n",
state_toset));
/* Set RF after the previous action is done. */
while (ppsc->rfchange_inprogress) {
rfwait_cnt++;
mdelay(1);
/*
*Wait too long, return false to avoid
*to be stuck here.
*/
if (rfwait_cnt > 100)
return false;
}
} else {
ppsc->rfchange_inprogress = true;
spin_unlock(&rtlpriv->locks.rf_ps_lock);
break;
}
}
no_protect:
switch (state_toset) {
case ERFON:
ppsc->rfoff_reason &= (~changesource);
if ((changesource == RF_CHANGE_BY_HW) &&
(ppsc->hwradiooff == true)) {
ppsc->hwradiooff = false;
}
if (!ppsc->rfoff_reason) {
ppsc->rfoff_reason = 0;
actionallowed = true;
}
break;
case ERFOFF:
if ((changesource == RF_CHANGE_BY_HW)
&& (ppsc->hwradiooff == false)) {
ppsc->hwradiooff = true;
}
ppsc->rfoff_reason |= changesource;
actionallowed = true;
break;
case ERFSLEEP:
ppsc->rfoff_reason |= changesource;
actionallowed = true;
break;
default:
RT_TRACE(rtlpriv, COMP_ERR, DBG_EMERG,
("switch case not process\n"));
break;
}
if (actionallowed)
rtlpriv->cfg->ops->set_rf_power_state(hw, state_toset);
if (!protect_or_not) {
spin_lock(&rtlpriv->locks.rf_ps_lock);
ppsc->rfchange_inprogress = false;
spin_unlock(&rtlpriv->locks.rf_ps_lock);
}
return actionallowed;
}
EXPORT_SYMBOL(rtl_ps_set_rf_state);
static void _rtl_ps_inactive_ps(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
ppsc->swrf_processing = true;
if (ppsc->inactive_pwrstate == ERFON &&
rtlhal->interface == INTF_PCI) {
if ((ppsc->reg_rfps_level & RT_RF_OFF_LEVL_ASPM) &&
RT_IN_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM) &&
rtlhal->interface == INTF_PCI) {
rtlpriv->intf_ops->disable_aspm(hw);
RT_CLEAR_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM);
}
}
rtl_ps_set_rf_state(hw, ppsc->inactive_pwrstate,
RF_CHANGE_BY_IPS, false);
if (ppsc->inactive_pwrstate == ERFOFF &&
rtlhal->interface == INTF_PCI) {
if (ppsc->reg_rfps_level & RT_RF_OFF_LEVL_ASPM &&
!RT_IN_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM)) {
rtlpriv->intf_ops->enable_aspm(hw);
RT_SET_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM);
}
}
ppsc->swrf_processing = false;
}
void rtl_ips_nic_off_wq_callback(void *data)
{
struct rtl_works *rtlworks =
container_of_dwork_rtl(data, struct rtl_works, ips_nic_off_wq);
struct ieee80211_hw *hw = rtlworks->hw;
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
enum rf_pwrstate rtstate;
if (mac->opmode != NL80211_IFTYPE_STATION) {
RT_TRACE(rtlpriv, COMP_ERR, DBG_WARNING,
("not station return\n"));
return;
}
if (mac->link_state > MAC80211_NOLINK)
return;
if (is_hal_stop(rtlhal))
return;
if (rtlpriv->sec.being_setkey)
return;
if (ppsc->inactiveps) {
rtstate = ppsc->rfpwr_state;
/*
*Do not enter IPS in the following conditions:
*(1) RF is already OFF or Sleep
*(2) swrf_processing (indicates the IPS is still under going)
*(3) Connectted (only disconnected can trigger IPS)
*(4) IBSS (send Beacon)
*(5) AP mode (send Beacon)
*(6) monitor mode (rcv packet)
*/
if (rtstate == ERFON &&
!ppsc->swrf_processing &&
(mac->link_state == MAC80211_NOLINK) &&
!mac->act_scanning) {
RT_TRACE(rtlpriv, COMP_RF, DBG_TRACE,
("IPSEnter(): Turn off RF.\n"));
ppsc->inactive_pwrstate = ERFOFF;
ppsc->in_powersavemode = true;
/*rtl_pci_reset_trx_ring(hw); */
_rtl_ps_inactive_ps(hw);
}
}
}
void rtl_ips_nic_off(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
/*
*because when link with ap, mac80211 will ask us
*to disable nic quickly after scan before linking,
*this will cause link failed, so we delay 100ms here
*/
queue_delayed_work(rtlpriv->works.rtl_wq,
&rtlpriv->works.ips_nic_off_wq, MSECS(100));
}
void rtl_ips_nic_on(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
enum rf_pwrstate rtstate;
if (mac->opmode != NL80211_IFTYPE_STATION)
return;
spin_lock(&rtlpriv->locks.ips_lock);
if (ppsc->inactiveps) {
rtstate = ppsc->rfpwr_state;
if (rtstate != ERFON &&
!ppsc->swrf_processing &&
ppsc->rfoff_reason <= RF_CHANGE_BY_IPS) {
ppsc->inactive_pwrstate = ERFON;
ppsc->in_powersavemode = false;
_rtl_ps_inactive_ps(hw);
}
}
spin_unlock(&rtlpriv->locks.ips_lock);
}
/*for FW LPS*/
/*
*Determine if we can set Fw into PS mode
*in current condition.Return TRUE if it
*can enter PS mode.
*/
static bool rtl_get_fwlps_doze(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
u32 ps_timediff;
ps_timediff = jiffies_to_msecs(jiffies -
ppsc->last_delaylps_stamp_jiffies);
if (ps_timediff < 2000) {
RT_TRACE(rtlpriv, COMP_POWER, DBG_LOUD,
("Delay enter Fw LPS for DHCP, ARP,"
" or EAPOL exchanging state.\n"));
return false;
}
if (mac->link_state != MAC80211_LINKED)
return false;
if (mac->opmode == NL80211_IFTYPE_ADHOC)
return false;
return true;
}
/* Change current and default preamble mode.*/
static void rtl_lps_set_psmode(struct ieee80211_hw *hw, u8 rt_psmode)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
u8 rpwm_val, fw_pwrmode;
if (mac->opmode == NL80211_IFTYPE_ADHOC)
return;
if (mac->link_state != MAC80211_LINKED)
return;
if (ppsc->dot11_psmode == rt_psmode)
return;
/* Update power save mode configured. */
ppsc->dot11_psmode = rt_psmode;
/*
*<FW control LPS>
*1. Enter PS mode
* Set RPWM to Fw to turn RF off and send H2C fw_pwrmode
* cmd to set Fw into PS mode.
*2. Leave PS mode
* Send H2C fw_pwrmode cmd to Fw to set Fw into Active
* mode and set RPWM to turn RF on.
*/
if ((ppsc->fwctrl_lps) && ppsc->report_linked) {
bool fw_current_inps;
if (ppsc->dot11_psmode == EACTIVE) {
RT_TRACE(rtlpriv, COMP_RF, DBG_DMESG,
("FW LPS leave ps_mode:%x\n",
FW_PS_ACTIVE_MODE));
rpwm_val = 0x0C; /* RF on */
fw_pwrmode = FW_PS_ACTIVE_MODE;
rtlpriv->cfg->ops->set_hw_reg(hw, HW_VAR_SET_RPWM,
(u8 *) (&rpwm_val));
rtlpriv->cfg->ops->set_hw_reg(hw,
HW_VAR_H2C_FW_PWRMODE,
(u8 *) (&fw_pwrmode));
fw_current_inps = false;
rtlpriv->cfg->ops->set_hw_reg(hw,
HW_VAR_FW_PSMODE_STATUS,
(u8 *) (&fw_current_inps));
} else {
if (rtl_get_fwlps_doze(hw)) {
RT_TRACE(rtlpriv, COMP_RF, DBG_DMESG,
("FW LPS enter ps_mode:%x\n",
ppsc->fwctrl_psmode));
rpwm_val = 0x02; /* RF off */
fw_current_inps = true;
rtlpriv->cfg->ops->set_hw_reg(hw,
HW_VAR_FW_PSMODE_STATUS,
(u8 *) (&fw_current_inps));
rtlpriv->cfg->ops->set_hw_reg(hw,
HW_VAR_H2C_FW_PWRMODE,
(u8 *) (&ppsc->fwctrl_psmode));
rtlpriv->cfg->ops->set_hw_reg(hw,
HW_VAR_SET_RPWM,
(u8 *) (&rpwm_val));
} else {
/* Reset the power save related parameters. */
ppsc->dot11_psmode = EACTIVE;
}
}
}
}
/*Enter the leisure power save mode.*/
void rtl_lps_enter(struct ieee80211_hw *hw)
{
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
struct rtl_priv *rtlpriv = rtl_priv(hw);
if (!ppsc->fwctrl_lps)
return;
if (rtlpriv->sec.being_setkey)
return;
if (rtlpriv->link_info.busytraffic)
return;
/*sleep after linked 10s, to let DHCP and 4-way handshake ok enough!! */
if (mac->cnt_after_linked < 5)
return;
if (mac->opmode == NL80211_IFTYPE_ADHOC)
return;
if (mac->link_state != MAC80211_LINKED)
return;
spin_lock(&rtlpriv->locks.lps_lock);
/* Idle for a while if we connect to AP a while ago. */
if (mac->cnt_after_linked >= 2) {
if (ppsc->dot11_psmode == EACTIVE) {
RT_TRACE(rtlpriv, COMP_POWER, DBG_LOUD,
("Enter 802.11 power save mode...\n"));
rtl_lps_set_psmode(hw, EAUTOPS);
}
}
spin_unlock(&rtlpriv->locks.lps_lock);
}
/*Leave the leisure power save mode.*/
void rtl_lps_leave(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
struct rtl_hal *rtlhal = rtl_hal(rtl_priv(hw));
spin_lock(&rtlpriv->locks.lps_lock);
if (ppsc->fwctrl_lps) {
if (ppsc->dot11_psmode != EACTIVE) {
/*FIX ME */
rtlpriv->cfg->ops->enable_interrupt(hw);
if (ppsc->reg_rfps_level & RT_RF_LPS_LEVEL_ASPM &&
RT_IN_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM) &&
rtlhal->interface == INTF_PCI) {
rtlpriv->intf_ops->disable_aspm(hw);
RT_CLEAR_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM);
}
RT_TRACE(rtlpriv, COMP_POWER, DBG_LOUD,
("Busy Traffic,Leave 802.11 power save..\n"));
rtl_lps_set_psmode(hw, EACTIVE);
}
}
spin_unlock(&rtlpriv->locks.lps_lock);
}
/* For sw LPS*/
void rtl_swlps_beacon(struct ieee80211_hw *hw, void *data, unsigned int len)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct ieee80211_hdr *hdr = (void *) data;
struct ieee80211_tim_ie *tim_ie;
u8 *tim;
u8 tim_len;
bool u_buffed;
bool m_buffed;
if (mac->opmode != NL80211_IFTYPE_STATION)
return;
if (!rtlpriv->psc.swctrl_lps)
return;
if (rtlpriv->mac80211.link_state != MAC80211_LINKED)
return;
if (!rtlpriv->psc.sw_ps_enabled)
return;
if (rtlpriv->psc.fwctrl_lps)
return;
if (likely(!(hw->conf.flags & IEEE80211_CONF_PS)))
return;
/* check if this really is a beacon */
if (!ieee80211_is_beacon(hdr->frame_control))
return;
/* min. beacon length + FCS_LEN */
if (len <= 40 + FCS_LEN)
return;
/* and only beacons from the associated BSSID, please */
if (compare_ether_addr(hdr->addr3, rtlpriv->mac80211.bssid))
return;
rtlpriv->psc.last_beacon = jiffies;
tim = rtl_find_ie(data, len - FCS_LEN, WLAN_EID_TIM);
if (!tim)
return;
if (tim[1] < sizeof(*tim_ie))
return;
tim_len = tim[1];
tim_ie = (struct ieee80211_tim_ie *) &tim[2];
if (!WARN_ON_ONCE(!hw->conf.ps_dtim_period))
rtlpriv->psc.dtim_counter = tim_ie->dtim_count;
/* Check whenever the PHY can be turned off again. */
/* 1. What about buffered unicast traffic for our AID? */
u_buffed = ieee80211_check_tim(tim_ie, tim_len,
rtlpriv->mac80211.assoc_id);
/* 2. Maybe the AP wants to send multicast/broadcast data? */
m_buffed = tim_ie->bitmap_ctrl & 0x01;
rtlpriv->psc.multi_buffered = m_buffed;
/* unicast will process by mac80211 through
* set ~IEEE80211_CONF_PS, So we just check
* multicast frames here */
if (!m_buffed) {
/* back to low-power land. and delay is
* prevent null power save frame tx fail */
queue_delayed_work(rtlpriv->works.rtl_wq,
&rtlpriv->works.ps_work, MSECS(5));
} else {
RT_TRACE(rtlpriv, COMP_POWER, DBG_DMESG, ("u_bufferd: %x, "
"m_buffered: %x\n", u_buffed, m_buffed));
}
}
void rtl_swlps_rf_awake(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
if (!rtlpriv->psc.swctrl_lps)
return;
if (mac->link_state != MAC80211_LINKED)
return;
if (ppsc->reg_rfps_level & RT_RF_LPS_LEVEL_ASPM &&
RT_IN_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM)) {
rtlpriv->intf_ops->disable_aspm(hw);
RT_CLEAR_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM);
}
spin_lock(&rtlpriv->locks.lps_lock);
rtl_ps_set_rf_state(hw, ERFON, RF_CHANGE_BY_PS, false);
spin_unlock(&rtlpriv->locks.lps_lock);
}
void rtl_swlps_rfon_wq_callback(void *data)
{
struct rtl_works *rtlworks =
container_of_dwork_rtl(data, struct rtl_works, ps_rfon_wq);
struct ieee80211_hw *hw = rtlworks->hw;
rtl_swlps_rf_awake(hw);
}
void rtl_swlps_rf_sleep(struct ieee80211_hw *hw)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
u8 sleep_intv;
if (!rtlpriv->psc.sw_ps_enabled)
return;
if ((rtlpriv->sec.being_setkey) ||
(mac->opmode == NL80211_IFTYPE_ADHOC))
return;
/*sleep after linked 10s, to let DHCP and 4-way handshake ok enough!! */
if ((mac->link_state != MAC80211_LINKED) || (mac->cnt_after_linked < 5))
return;
if (rtlpriv->link_info.busytraffic)
return;
spin_lock(&rtlpriv->locks.rf_ps_lock);
if (rtlpriv->psc.rfchange_inprogress) {
spin_unlock(&rtlpriv->locks.rf_ps_lock);
return;
}
spin_unlock(&rtlpriv->locks.rf_ps_lock);
spin_lock(&rtlpriv->locks.lps_lock);
rtl_ps_set_rf_state(hw, ERFSLEEP, RF_CHANGE_BY_PS, false);
spin_unlock(&rtlpriv->locks.lps_lock);
if (ppsc->reg_rfps_level & RT_RF_OFF_LEVL_ASPM &&
!RT_IN_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM)) {
rtlpriv->intf_ops->enable_aspm(hw);
RT_SET_PS_LEVEL(ppsc, RT_PS_LEVEL_ASPM);
}
/* here is power save alg, when this beacon is DTIM
* we will set sleep time to dtim_period * n;
* when this beacon is not DTIM, we will set sleep
* time to sleep_intv = rtlpriv->psc.dtim_counter or
* MAX_SW_LPS_SLEEP_INTV(default set to 5) */
if (rtlpriv->psc.dtim_counter == 0) {
if (hw->conf.ps_dtim_period == 1)
sleep_intv = hw->conf.ps_dtim_period * 2;
else
sleep_intv = hw->conf.ps_dtim_period;
} else {
sleep_intv = rtlpriv->psc.dtim_counter;
}
if (sleep_intv > MAX_SW_LPS_SLEEP_INTV)
sleep_intv = MAX_SW_LPS_SLEEP_INTV;
/* this print should always be dtim_conter = 0 &
* sleep = dtim_period, that meaons, we should
* awake before every dtim */
RT_TRACE(rtlpriv, COMP_POWER, DBG_DMESG,
("dtim_counter:%x will sleep :%d"
" beacon_intv\n", rtlpriv->psc.dtim_counter, sleep_intv));
/* we tested that 40ms is enough for sw & hw sw delay */
queue_delayed_work(rtlpriv->works.rtl_wq, &rtlpriv->works.ps_rfon_wq,
MSECS(sleep_intv * mac->vif->bss_conf.beacon_int - 40));
}
void rtl_swlps_wq_callback(void *data)
{
struct rtl_works *rtlworks = container_of_dwork_rtl(data,
struct rtl_works,
ps_work);
struct ieee80211_hw *hw = rtlworks->hw;
struct rtl_priv *rtlpriv = rtl_priv(hw);
bool ps = false;
ps = (hw->conf.flags & IEEE80211_CONF_PS);
/* we can sleep after ps null send ok */
if (rtlpriv->psc.state_inap) {
rtl_swlps_rf_sleep(hw);
if (rtlpriv->psc.state && !ps) {
rtlpriv->psc.sleep_ms = jiffies_to_msecs(jiffies -
rtlpriv->psc.last_action);
}
if (ps)
rtlpriv->psc.last_slept = jiffies;
rtlpriv->psc.last_action = jiffies;
rtlpriv->psc.state = ps;
}
}