forked from Minki/linux
d8c42c0c28
Currently the PSM entry function assumes successful operation, and enables ELP, BET and beacon filtering right away. This is bad, because the PSM entry may fail due to environmental issues, which will cause the ELP, BET and beacon filtering to be illegally enabled (because FW remains in active state.) Fix this by enabling ELP, BET and beacon filtering only after successful entry, and by ensuring the firmware is in active mode after the failure. Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com> Reviewed-by: Luciano Coelho <luciano.coelho@nokia.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2008-2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include "wl1271_reg.h"
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#include "wl1271_ps.h"
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#include "wl1271_spi.h"
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#define WL1271_WAKEUP_TIMEOUT 500
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void wl1271_elp_work(struct work_struct *work)
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{
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struct delayed_work *dwork;
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struct wl1271 *wl;
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dwork = container_of(work, struct delayed_work, work);
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wl = container_of(dwork, struct wl1271, elp_work);
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wl1271_debug(DEBUG_PSM, "elp work");
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mutex_lock(&wl->mutex);
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if (test_bit(WL1271_FLAG_IN_ELP, &wl->flags) ||
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!test_bit(WL1271_FLAG_PSM, &wl->flags))
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goto out;
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wl1271_debug(DEBUG_PSM, "chip to elp");
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wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_SLEEP);
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set_bit(WL1271_FLAG_IN_ELP, &wl->flags);
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out:
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mutex_unlock(&wl->mutex);
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}
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#define ELP_ENTRY_DELAY 5
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/* Routines to toggle sleep mode while in ELP */
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void wl1271_ps_elp_sleep(struct wl1271 *wl)
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{
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if (test_bit(WL1271_FLAG_PSM, &wl->flags)) {
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cancel_delayed_work(&wl->elp_work);
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ieee80211_queue_delayed_work(wl->hw, &wl->elp_work,
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msecs_to_jiffies(ELP_ENTRY_DELAY));
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}
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}
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int wl1271_ps_elp_wakeup(struct wl1271 *wl, bool chip_awake)
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{
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DECLARE_COMPLETION_ONSTACK(compl);
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unsigned long flags;
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int ret;
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u32 start_time = jiffies;
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bool pending = false;
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if (!test_bit(WL1271_FLAG_IN_ELP, &wl->flags))
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return 0;
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wl1271_debug(DEBUG_PSM, "waking up chip from elp");
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/*
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* The spinlock is required here to synchronize both the work and
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* the completion variable in one entity.
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*/
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spin_lock_irqsave(&wl->wl_lock, flags);
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if (work_pending(&wl->irq_work) || chip_awake)
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pending = true;
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else
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wl->elp_compl = &compl;
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spin_unlock_irqrestore(&wl->wl_lock, flags);
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wl1271_raw_write32(wl, HW_ACCESS_ELP_CTRL_REG_ADDR, ELPCTRL_WAKE_UP);
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if (!pending) {
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ret = wait_for_completion_timeout(
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&compl, msecs_to_jiffies(WL1271_WAKEUP_TIMEOUT));
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if (ret == 0) {
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wl1271_error("ELP wakeup timeout!");
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ret = -ETIMEDOUT;
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goto err;
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} else if (ret < 0) {
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wl1271_error("ELP wakeup completion error.");
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goto err;
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}
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}
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clear_bit(WL1271_FLAG_IN_ELP, &wl->flags);
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wl1271_debug(DEBUG_PSM, "wakeup time: %u ms",
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jiffies_to_msecs(jiffies - start_time));
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goto out;
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err:
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spin_lock_irqsave(&wl->wl_lock, flags);
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wl->elp_compl = NULL;
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spin_unlock_irqrestore(&wl->wl_lock, flags);
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return ret;
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out:
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return 0;
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}
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int wl1271_ps_set_mode(struct wl1271 *wl, enum wl1271_cmd_ps_mode mode,
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bool send)
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{
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int ret;
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switch (mode) {
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case STATION_POWER_SAVE_MODE:
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wl1271_debug(DEBUG_PSM, "entering psm");
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ret = wl1271_cmd_ps_mode(wl, STATION_POWER_SAVE_MODE, send);
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if (ret < 0)
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return ret;
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set_bit(WL1271_FLAG_PSM, &wl->flags);
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break;
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case STATION_ACTIVE_MODE:
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default:
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wl1271_debug(DEBUG_PSM, "leaving psm");
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ret = wl1271_ps_elp_wakeup(wl, false);
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if (ret < 0)
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return ret;
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/* disable beacon early termination */
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ret = wl1271_acx_bet_enable(wl, false);
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if (ret < 0)
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return ret;
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/* disable beacon filtering */
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ret = wl1271_acx_beacon_filter_opt(wl, false);
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if (ret < 0)
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return ret;
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ret = wl1271_cmd_ps_mode(wl, STATION_ACTIVE_MODE, send);
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if (ret < 0)
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return ret;
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clear_bit(WL1271_FLAG_PSM, &wl->flags);
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break;
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}
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return ret;
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}
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